Lung Auscultation in Nursing Practice
A comprehensive BSN-level course on lung auscultation — respiratory anatomy review, assessment technique, auscultation sequence and landmarks, normal and adventitious breath sounds, clinical significance, differential assessment, documentation, and special populations — aligned with AACN Essentials, QSEN, and NCLEX-NG standards.
Course Overview
Lung auscultation — the act of listening to breath sounds with a stethoscope — is one of the most powerful and frequently performed clinical skills in nursing practice. First formalized by René Laënnec in 1816, auscultation remains the standard of care for rapid, non-invasive respiratory assessment in every clinical setting from emergency departments to home health visits.
For BSN-prepared nurses, competence in lung auscultation means more than identifying “abnormal” or “normal” sounds. It requires the ability to describe findings precisely, correlate them with pathophysiology, integrate them with the broader clinical picture, and communicate findings in ways that inform timely, safe care decisions. A nurse who hears new crackles in a post-operative patient and recognizes this as a sign of atelectasis — and acts on that recognition — may prevent a cascade toward pneumonia, respiratory failure, and prolonged hospitalization.
This course builds that competence systematically. Students will learn the anatomical and physiological basis of breath sounds, master assessment technique and documentation, and develop the clinical reasoning skills to use auscultation findings as a powerful lens on patient health.
Learning Objectives
By the end of this course, students will be able to:
- Identify the anatomical structures and physiological mechanisms that produce normal and abnormal breath sounds. (Bloom’s: Remember)
- Demonstrate proper stethoscope technique, patient positioning, and systematic auscultation sequence for a complete respiratory assessment. (Bloom’s: Apply)
- Locate and name the standard auscultation landmarks on the anterior, posterior, and lateral chest wall. (Bloom’s: Remember)
- Distinguish among the four normal breath sounds — tracheal, bronchial, bronchovesicular, and vesicular — by location, pitch, intensity, and inspiratory-to-expiratory ratio. (Bloom’s: Analyze)
- Identify and characterize each type of adventitious breath sound — fine and coarse crackles, wheezes, rhonchi, stridor, and pleural friction rub. (Bloom’s: Analyze)
- Correlate abnormal breath sounds with underlying pathophysiology and generate a prioritized differential for common respiratory conditions. (Bloom’s: Evaluate)
- Apply clinical reasoning to integrate auscultation findings with other assessment data, vital signs, and diagnostic results. (Bloom’s: Evaluate)
- Construct accurate and legally defensible documentation of respiratory auscultation findings using standard nursing terminology. (Bloom’s: Create)
- Adapt auscultation technique for special populations including pediatric, geriatric, bariatric, and post-operative patients. (Bloom’s: Apply)
- Recognize immediately life-threatening respiratory findings that require urgent nursing intervention and provider notification. (Bloom’s: Evaluate)
Course Structure
| Module | Title | Key Focus |
|---|---|---|
| 1 | Anatomy & Physiology of the Respiratory System | Airway structures, lung lobes, mechanics of breathing, sound production |
| 2 | Stethoscope Use and Assessment Technique | Equipment selection, patient preparation, auscultation method |
| 3 | Landmarks and Auscultation Sequence | Anterior, posterior, lateral landmarks; systematic approach |
| 4 | Normal Breath Sounds | Tracheal, bronchial, bronchovesicular, vesicular |
| 5 | Adventitious Breath Sounds | Crackles, wheezes, rhonchi, stridor, pleural friction rub |
| 6 | Clinical Significance & Differential Assessment | Pathophysiology correlations, common conditions, red flags |
| 7 | Documentation and Communication | Standard terminology, SBAR, legal considerations |
| 8 | Special Populations | Pediatric, geriatric, bariatric, post-operative adaptations |
| 9 | NCLEX-Style Practice Questions | Clinical judgment application and test preparation |
Module 1: Anatomy & Physiology of the Respiratory System
Overview
Sound cannot be interpreted without a map. Understanding how airflow moves through the respiratory tract — and how the properties of that flow interact with airway walls, fluid, mucus, and tissue — is the foundation for understanding why breath sounds sound the way they do.
The Respiratory Tract
The respiratory system is divided into the upper airway (nose, mouth, pharynx, larynx) and the lower airway (trachea, bronchi, bronchioles, alveoli). Sounds generated during breathing travel through and are modified by each of these structures:
- Trachea: A rigid, cartilaginous tube about 10–12 cm long in adults. Turbulent airflow here produces loud, high-pitched sounds.
- Mainstem bronchi: The trachea bifurcates at the carina (approximately at the level of the sternal angle, T4). The right mainstem bronchus is shorter, wider, and more vertical — a key reason foreign bodies and aspirated material more commonly lodge on the right.
- Lobar and segmental bronchi: Progressive branching reduces airway diameter and increases total cross-sectional area, transitioning flow from turbulent to laminar.
- Bronchioles: Terminal and respiratory bronchioles have no cartilage. They depend on surrounding alveolar tissue for structural support — a key vulnerability in obstructive disease.
- Alveoli: Approximately 300–500 million alveoli provide the enormous surface area for gas exchange. Normal alveoli are air-filled and produce no sound themselves during auscultation.
The Lung Lobes
Correct landmark identification requires knowing which lobe underlies each area of the chest wall:
| Lobe | Anterior Borders | Posterior Borders |
|---|---|---|
| Right Upper (RUL) | Above 4th rib at mid-clavicular line | Above T4 spinous process |
| Right Middle (RML) | 4th–6th rib at mid-clavicular line | Lateral, between T4 and T6 |
| Right Lower (RLL) | Below 6th rib at mid-clavicular line | Below T4, entire lower posterior right |
| Left Upper (LUL) | Above 4th rib; includes lingula (4th–6th) | Above T4 spinous process |
| Left Lower (LLL) | Below 6th rib at mid-clavicular line | Below T4, entire lower posterior left |
Clinical Pearl: The posterior chest provides the best access to the lower lobes — the sites most vulnerable to pneumonia, pleural effusion, and atelectasis. Anterior auscultation primarily assesses upper and middle lobes.
Mechanics of Breathing and Sound Production
Breath sounds are generated primarily by turbulent airflow in the larger airways. As air moves rapidly through the trachea and proximal bronchi, it creates vibrations that are transmitted through the bronchial walls and lung parenchyma to the chest wall, where they are detected by the stethoscope.
Key physiological principles:
- Turbulence vs. laminar flow: Turbulent airflow generates sound; laminar flow (in smaller bronchioles and alveoli) does not. This is why normal peripheral lung tissue produces only soft, gentle vesicular sounds.
- Airway diameter: Narrowed airways (bronchospasm, secretions, foreign body) increase turbulence and flow velocity, generating adventitious sounds.
- Tissue transmission: Consolidation (as in pneumonia) conducts sound better than air-filled tissue; fluid and air in the pleural space muffle or eliminate sounds.
- Respiratory rate and effort: Deep, forced breathing increases turbulence and may reveal sounds not audible at rest.
Module 2: Stethoscope Use and Assessment Technique
Overview
The stethoscope is the primary instrument of lung auscultation. Correct equipment selection, setup, and technique are prerequisites for obtaining reliable, clinically useful findings.
Stethoscope Components and Selection
Modern acoustic stethoscopes consist of:
- Earpieces (ear tips): Should fit snugly and comfortably; angled forward to align with the ear canal.
- Ear tubes (binaural): Should be angled forward (toward the nose) during use.
- Tubing: Standard length is 22 inches; shorter tubing reduces sound attenuation. Avoid kinked, cracked, or damaged tubing.
- Chest piece: The dual-head chest piece includes:
- Diaphragm (flat side): Detects high-pitched sounds — breath sounds, normal heart sounds (S1, S2), friction rubs, wheezes.
- Bell (concave side): Detects low-pitched sounds — S3 and S4 heart sounds, some low-pitched crackles, vascular bruits. Must be applied with light pressure; firm pressure converts the bell to a diaphragm.
For lung auscultation, the diaphragm is used in most situations. Electronic (amplifying) stethoscopes are valuable for noisy environments and hearing-impaired practitioners.
Preparing the Patient
Proper preparation improves sound quality and patient comfort:
- Explain the procedure: Tell the patient you will be listening to their lungs. Describe what they will feel (cool diaphragm) and what you need them to do.
- Position: Seated upright (90°) with arms slightly forward is ideal for posterior auscultation. Supine is acceptable for anterior auscultation in patients unable to sit.
- Expose the chest: Auscultate directly on skin when possible — clothing, gowns, and bed sheets generate artifact sounds. Ask for the patient’s permission and maintain dignity with draping.
- Instruct on breathing: Ask the patient to breathe through the mouth slightly deeper than normal. Demonstrate if needed. Avoid very deep breathing in patients who may hyperventilate.
- Warm the diaphragm: Rub the diaphragm against your palm before placing it on the patient.
- Minimize ambient noise: Turn off televisions, lower voice volumes, close curtains.
Auscultation Technique
- Apply the diaphragm firmly to the chest wall, making full contact. Avoid pressing so hard you block airflow, but insufficient pressure allows air gaps and artifact.
- Hold the stethoscope handle gently — do not allow fingers to rub the tubing, which creates artifact sounds.
- Listen for at least one full respiratory cycle (one inspiration and one expiration) at each site before moving.
- Compare side to side symmetrically (right to left, then left to right) at each level to detect asymmetry.
- Count at least 8–12 auscultation sites in a complete assessment.
Common Sources of Artifact (False Sounds)
| Artifact Source | How to Eliminate |
|---|---|
| Chest hair (produces crackle-like sounds) | Wet hair with a damp cloth before auscultation |
| Patient shivering | Warm the patient; warm the diaphragm |
| Finger rubbing tubing | Hold stethoscope head still; use index finger and thumb |
| Clothing or gown over diaphragm | Auscultate directly on skin |
| Patient talking during auscultation | Remind patient to breathe quietly through mouth |
| Diaphragm not fully contacting skin | Reposition for full contact |
Module 3: Landmarks and Auscultation Sequence
Overview
A systematic, consistent approach prevents omissions and builds the pattern recognition skills that allow nurses to immediately notice deviations from baseline.
Anatomical Reference Lines
The following vertical reference lines are used to describe auscultation sites:
- Midsternal line: Bisects the sternum vertically.
- Midclavicular lines (MCL): Vertical lines through the midpoints of each clavicle.
- Anterior axillary line (AAL): Vertical line at the anterior fold of the axilla.
- Midaxillary line (MAL): Vertical line through the apex of the axilla.
- Posterior axillary line (PAL): Vertical line at the posterior fold of the axilla.
- Scapular line: Vertical line through the inferior angle of the scapula.
- Vertebral line: Along the spinous processes.
Anterior Chest Auscultation Sites
Auscultate the anterior chest with the patient sitting up or supine (if unable to sit). Use the following sequence, comparing left to right at each level:
| Site | Intercostal Space (ICS) | Landmark | Lobe Underlying |
|---|---|---|---|
| 1 | 2nd ICS | Right MCL | RUL |
| 2 | 2nd ICS | Left MCL | LUL |
| 3 | 4th ICS | Right MCL | RML |
| 4 | 4th ICS | Left MCL | LUL (Lingula) |
| 5 | 6th ICS | Right MCL | RLL |
| 6 | 6th ICS | Left MCL | LLL |
Posterior Chest Auscultation Sites
The posterior chest is the most important area for lower lobe assessment. The patient should be seated and lean slightly forward with arms crossed in front (this abducts the scapulae, opening access to lung fields).
| Site | Level | Landmark | Lobe Underlying |
|---|---|---|---|
| 1 | Above scapular spine | Right paravertebral | RUL |
| 2 | Above scapular spine | Left paravertebral | LUL |
| 3 | Mid-scapular | Right paravertebral | RLL (upper) |
| 4 | Mid-scapular | Left paravertebral | LLL (upper) |
| 5 | Below scapular angle (T7) | Right paravertebral | RLL (lower) |
| 6 | Below scapular angle (T7) | Left paravertebral | LLL (lower) |
Lateral Chest Auscultation Sites
Assess the lateral chest at the midaxillary line (right and left sides):
- Upper lateral: 4th ICS at MAL — assesses right middle lobe laterally (right) and LUL lingula (left).
- Lower lateral: 6th ICS at MAL — assesses lower lobe bases bilaterally.
The Systematic Auscultation Sequence
The recommended approach is a zigzag (alternating side-to-side) pattern moving from apex to base:
- Begin at the lung apices (above the clavicles, or 2nd ICS anteriorly).
- Move downward, comparing right to left at each level.
- Assess anterior chest → lateral chest → posterior chest.
- End at the lung bases.
This systematic approach ensures every lobe is assessed and that asymmetric findings are immediately recognized.
Mnemonic — “Apples to Bases, Side to Side”: Start at the Apices, work to the Bases, always comparing Side-to-Side.
Module 4: Normal Breath Sounds
Overview
Before adventitious sounds can be recognized, the nurse must have a thorough, internalized understanding of what normal sounds like in each location. Normal breath sounds vary by location — what is normal over the trachea would be abnormal over the lung periphery.
The Four Normal Breath Sounds
1. Tracheal (Tubular) Sounds
| Feature | Description |
|---|---|
| Location | Directly over the trachea in the anterior neck |
| Quality | Very loud, harsh, high-pitched, hollow or tubular |
| I:E Ratio | Inspiratory ≈ Expiratory (roughly equal); slight expiratory pause |
| Mechanism | Turbulent airflow through the large-diameter trachea |
Tracheal sounds are often the loudest sounds heard during auscultation. They are normal over the trachea only. Hearing tracheal-quality sounds over the lung periphery indicates consolidation (referred to as bronchial sounds heard in an abnormal location — see Module 6).
2. Bronchial Sounds
| Feature | Description |
|---|---|
| Location | Over the manubrium (upper anterior chest, near the sternal notch) |
| Quality | Loud, high-pitched, hollow |
| I:E Ratio | Expiratory phase longer than inspiratory (E > I), with a pause between |
| Mechanism | Turbulent flow in the proximal bronchi transmitted to the chest wall |
Normal only over the manubrium. When heard over the peripheral lung fields, bronchial sounds indicate underlying consolidation (pneumonia), which allows sound to transmit more efficiently.
3. Bronchovesicular Sounds
| Feature | Description |
|---|---|
| Location | 1st–2nd ICS anteriorly (near the sternal border); between the scapulae posteriorly |
| Quality | Medium pitch, medium intensity — a blend of bronchial and vesicular |
| I:E Ratio | Inspiratory ≈ Expiratory (roughly equal, no pause) |
| Mechanism | Airflow in medium-sized bronchi; transition zone between large and small airways |
Bronchovesicular sounds are normal in their expected location. When heard over the lower lung fields, they may indicate early consolidation or compression.
4. Vesicular Sounds
| Feature | Description |
|---|---|
| Location | Over most of the peripheral lung fields — the majority of the lung surface |
| Quality | Soft, low-pitched, gentle, like a “breeze through leaves” |
| I:E Ratio | Inspiratory phase much longer than expiratory (I >> E); expiration may be nearly silent |
| Mechanism | Airflow in smaller bronchioles and alveolar ducts; sound is soft because turbulence is minimal |
Vesicular sounds are the expected normal finding over most of the lung. Decreased or absent vesicular sounds can indicate reduced airflow (airway obstruction, atelectasis, pleural effusion, pneumothorax) or poor inspiratory effort.
Comparison Table: Normal Breath Sounds
| Sound | Location | Pitch | Intensity | I:E Ratio | Normal Location? |
|---|---|---|---|---|---|
| Tracheal | Over trachea | High | Very loud | ≈ Equal | Trachea only |
| Bronchial | Over manubrium | High | Loud | E > I | Manubrium only |
| Bronchovesicular | 1st–2nd ICS, sternal border; interscapular | Medium | Medium | ≈ Equal | Limited areas |
| Vesicular | Peripheral lung fields | Low | Soft | I >> E | Most of the lung |
Module 5: Adventitious Breath Sounds
Overview
Adventitious breath sounds are abnormal sounds superimposed on or replacing normal breath sounds. They are classified as either continuous (lasting > 250 ms) or discontinuous (brief, < 20 ms). Accurate characterization — including timing in the respiratory cycle, pitch, intensity, and clinical context — is essential for correct identification and interpretation.
Classification System
Adventitious Breath Sounds
├── Discontinuous (Interrupted)
│ └── Crackles (formerly "rales")
│ ├── Fine Crackles
│ └── Coarse Crackles
└── Continuous (Sustained)
├── High-Pitched Continuous
│ ├── Wheeze (musical, polyphonic or monophonic)
│ └── Stridor (monophonic, inspiratory or biphasic)
└── Low-Pitched Continuous
├── Rhonchi (sonorous)
└── Pleural Friction Rub (non-musical, creaking)Crackles (Rales)
Crackles are discontinuous, interrupted, non-musical sounds produced by the sudden opening of collapsed or fluid-filled small airways and alveoli during inspiration.
Fine Crackles
| Feature | Description |
|---|---|
| Sound quality | Soft, brief, high-pitched popping — like rubbing strands of hair near the ear |
| Timing | Predominantly late inspiratory (at peak inflation, when closed alveoli pop open) |
| Location | Most prominent at lung bases and posterior fields |
| Effect of coughing | Not cleared by coughing |
| Clinical associations | Pulmonary fibrosis, early pulmonary edema, early pneumonia, atelectasis |
Mechanism: Fine crackles result from the explosive reopening of atelectatic (collapsed) small airways and alveoli against the surface tension of fluid lining them. They are heard late in inspiration when alveolar pressure finally exceeds the surface tension keeping the alveolus closed.
Coarse Crackles
| Feature | Description |
|---|---|
| Sound quality | Loud, wet, bubbly, low-pitched — like rubbing two pieces of Velcro apart |
| Timing | Early to mid-inspiratory and may also be heard in expiration |
| Location | More diffuse, often bilaterally at bases; may be heard throughout |
| Effect of coughing | May partially clear or change with coughing |
| Clinical associations | Pulmonary edema (moderate to severe), pneumonia with secretions, bronchiectasis, COPD exacerbation |
Mechanism: Coarse crackles result from air moving through airways containing excess fluid or secretions. The fluid snaps and bursts as airflow interrupts it, producing a lower-pitched, wetter sound than fine crackles.
Wheezes
Wheezes are continuous, high-pitched, musical sounds produced by air moving through narrowed airways. They can occur during inspiration, expiration, or both — though expiratory wheezes are more common because airways naturally narrow slightly during expiration.
| Feature | Description |
|---|---|
| Sound quality | High-pitched, musical, whistling or squeaky |
| Timing | Most commonly expiratory; can be inspiratory in severe obstruction |
| Monophonic vs. Polyphonic | Monophonic (single pitch) suggests a single obstructed airway; polyphonic (multiple simultaneous pitches) suggests diffuse airway narrowing |
| Effect of coughing | May decrease temporarily after coughing |
| Clinical associations | Asthma, COPD, bronchospasm, anaphylaxis, cardiac asthma, foreign body aspiration (focal wheeze) |
Clinical Warning: A silent chest in a patient with a known history of asthma is a medical emergency — it indicates airways are so severely obstructed that airflow is insufficient to generate a wheeze. Initiate emergency interventions immediately.
Rhonchi
Rhonchi are continuous, low-pitched, snoring or gurgling sounds produced by secretions or fluid in the larger airways (trachea, bronchi).
| Feature | Description |
|---|---|
| Sound quality | Low-pitched, coarse, rattling, snoring — often described as “wet” |
| Timing | Can occur in both inspiration and expiration; often more prominent during expiration |
| Effect of coughing | Characteristically change or clear with coughing — a key distinguishing feature |
| Clinical associations | COPD with secretions, bronchitis, pneumonia with mucus, post-operative retained secretions |
Differentiating Rhonchi from Coarse Crackles: Both are low-pitched and occur with secretions, but rhonchi are continuous while crackles are discontinuous (brief pops). Rhonchi typically change with coughing; fine crackles do not.
Stridor
Stridor is a loud, high-pitched, predominantly inspiratory monophonic sound produced by partial obstruction of the upper airway (larynx or trachea).
| Feature | Description |
|---|---|
| Sound quality | Loud, harsh, crowing, high-pitched; often audible without a stethoscope |
| Timing | Predominantly inspiratory; can be biphasic (both phases) in severe obstruction |
| Location | Heard best over the anterior neck / trachea |
| Clinical associations | Croup, epiglottitis, foreign body aspiration (upper airway), anaphylaxis, post-extubation laryngeal edema, laryngospasm |
Emergency Alert: Stridor always warrants immediate assessment and is a potential sign of impending airway compromise. Notify the provider and prepare for emergency airway management.
Pleural Friction Rub
A pleural friction rub is a discontinuous to continuous, non-musical, creaking or grating sound produced by inflamed pleural surfaces rubbing together during breathing.
| Feature | Description |
|---|---|
| Sound quality | Coarse, grating, creaking — like walking on fresh snow or leather rubbing on leather |
| Timing | Occurs in both inspiration and expiration; does NOT change with coughing |
| Location | Localized to the area of pleural inflammation; usually lower lateral chest |
| Effect of breath-holding | Sound disappears when patient holds breath (distinguishes from pericardial rub) |
| Clinical associations | Pleuritis (pleurisy), pulmonary infarction, pneumonia with pleural involvement |
Key Distinction from Pericardial Friction Rub: A pleural friction rub disappears when the patient holds their breath. A pericardial friction rub persists because it is generated by cardiac motion, not respiratory movement.
Summary: Adventitious Breath Sounds Quick Reference
| Sound | Continuous? | Pitch | Timing | Clears with Cough? | Key Associations |
|---|---|---|---|---|---|
| Fine Crackles | No | High | Late inspiratory | No | Fibrosis, early pulmonary edema, atelectasis |
| Coarse Crackles | No | Low | Early inspiratory | Partially | Pulmonary edema, pneumonia, COPD exac. |
| Wheeze | Yes | High | Expiratory > inspiratory | Partially | Asthma, COPD, bronchospasm |
| Rhonchi | Yes | Low | Both phases | Yes | Secretions in large airways, bronchitis |
| Stridor | Yes | High | Inspiratory | No | Upper airway obstruction — EMERGENCY |
| Pleural Friction Rub | Variable | Low-Medium | Both phases | No (stops with breath-hold) | Pleuritis, PE with infarction |
Module 6: Clinical Significance and Differential Assessment
Overview
Auscultation findings rarely stand alone. Skilled nurses integrate breath sounds with history, vital signs, oxygen saturation, work of breathing, and other physical examination data to form a clinical picture. This module maps common breath sound patterns to respiratory pathophysiology.
Common Respiratory Conditions and Their Auscultation Signatures
Asthma (Acute Exacerbation)
- Breath sounds: Diffuse expiratory wheezes, often polyphonic; may have prolonged expiration
- Associated findings: Dyspnea, tachypnea, tachycardia, accessory muscle use, tripod position, decreased SpO₂
- Red flag: Absent wheeze with severe respiratory distress (“silent chest”) — impending respiratory failure
COPD Exacerbation (Chronic Obstructive Pulmonary Disease)
- Breath sounds: Wheezes, rhonchi, and/or coarse crackles; often distant or diminished breath sounds (air trapping, barrel chest)
- Associated findings: Barrel chest, pursed-lip breathing, prolonged expiration, accessory muscle use, history of smoking
- Timing: Expiratory wheezes predominate; rhonchi may clear with coughing
Pneumonia (Lobar or Segmental)
- Breath sounds: Bronchial breath sounds heard over consolidated area (abnormal location); fine to coarse crackles; decreased breath sounds if there is associated pleural effusion
- Associated findings: Fever, chills, productive cough, pleuritic chest pain, decreased SpO₂; lobar consolidation on imaging
- Special finding: Egophony (“E” sounds like “A”), bronchophony, and whispered pectoriloquy — all indicate consolidation (see below)
Pulmonary Edema (Cardiogenic)
- Breath sounds: Bilateral basilar fine crackles (early); progressing to coarse crackles throughout lung fields; possible wheezes (“cardiac asthma”) in severe cases
- Associated findings: Orthopnea, paroxysmal nocturnal dyspnea, elevated JVD, S3 heart sound, peripheral edema, frothy sputum (severe)
- Pattern: Crackles are bilateral, symmetric, dependent — worse at bases, often clearing toward apices
Pleural Effusion
- Breath sounds: Markedly decreased or absent breath sounds over the affected area; dullness to percussion
- Associated findings: Dullness to percussion, decreased tactile fremitus, tracheal deviation away from large effusion
- Pattern: Effusions accumulate dependently — bases bilaterally in sitting position
Pneumothorax
- Breath sounds: Absent or markedly decreased on the affected side
- Associated findings: Tracheal deviation toward affected side (tension pneumothorax — away from affected side); hyperresonance to percussion; sudden onset pleuritic chest pain; tachycardia; decreasing SpO₂
- Emergency: Tension pneumothorax is immediately life-threatening — requires urgent needle decompression
Pulmonary Fibrosis
- Breath sounds: Bilateral fine (Velcro) crackles at lung bases; late inspiratory; non-clearing with cough
- Associated findings: Dry, non-productive cough; progressive dyspnea on exertion; clubbing of digits; “honeycomb” pattern on CT
- Pattern: Crackles are early-onset in disease, persistent, and non-clearing
Atelectasis (Post-Operative)
- Breath sounds: Diminished or absent breath sounds in affected area; fine crackles may be present as atelectatic alveoli re-open
- Associated findings: Low-grade fever (in post-operative period), declining SpO₂, increased respiratory rate
- Prevention: Deep breathing, incentive spirometry, early ambulation, adequate pain control
Vocal Resonance Maneuvers
When consolidation is suspected, three spoken-word tests can confirm increased sound transmission through consolidated (solid) lung tissue:
| Maneuver | How to Perform | Normal Finding | Finding in Consolidation |
|---|---|---|---|
| Bronchophony | Ask patient to say “ninety-nine” while auscultating | Muffled, indistinct sounds | Clear, loud transmission of voice sounds |
| Egophony | Ask patient to say “EEE” while auscultating | Muffled “EEE” sound | Sound changes to “AAA” (bleating quality) |
| Whispered Pectoriloquy | Ask patient to whisper “one, two, three” while auscultating | Faint, muffled whisper | Clear, distinct whisper transmission |
All three maneuvers are positive (abnormal) in consolidation because solid tissue transmits high-frequency vibrations more efficiently than air-filled tissue.
Red Flags Requiring Immediate Action
The following findings require immediate nursing intervention and urgent provider notification:
| Finding | Possible Cause | Action |
|---|---|---|
| Absent breath sounds unilaterally | Pneumothorax, massive effusion, main bronchus obstruction | Activate rapid response; prepare for decompression |
| Stridor at rest | Upper airway obstruction | Call rapid response; prepare for airway management |
| Silent chest in asthma patient | Impending respiratory arrest | Activate emergency response; administer bronchodilators |
| New bilateral crackles + decreasing SpO₂ | Pulmonary edema | Notify provider; prepare diuretics, O₂, positioning |
| Sudden onset absent breath sounds + hypotension | Tension pneumothorax | Emergency needle decompression; activate rapid response |
Module 7: Documentation and Communication
Overview
Accurate documentation of auscultation findings protects the patient by creating a reliable clinical record, protects the nurse legally, and communicates critical information to the entire healthcare team.
Standard Documentation Terminology
Use precise, standardized terms — avoid vague or subjective descriptors:
| Avoid | Use Instead |
|---|---|
| ”Lungs sound funny" | "Bilateral expiratory wheezes heard in all lung fields" |
| "Noisy breathing" | "Coarse crackles heard bilaterally at bases, right > left, mid-inspiratory" |
| "Clear to auscultation” (without specifics) | “Breath sounds clear to auscultation bilaterally in all fields, no adventitious sounds" |
| "Decreased air movement" | "Diminished breath sounds in the right lower lobe; absent at right base” |
Components of a Complete Respiratory Documentation Entry
A complete respiratory assessment note should include:
- Patient position at time of assessment (sitting, supine, etc.)
- Respiratory rate, rhythm, and depth (e.g., 18 breaths/min, regular, unlabored)
- Oxygen saturation and supplemental oxygen if applicable
- Work of breathing (accessory muscle use, nasal flaring, retractions, pursed-lip breathing)
- Breath sounds by location — systematically describe each lung field
- Character of any adventitious sounds (type, timing, location, whether clearing with cough)
- Patient symptoms (dyspnea, chest pain, cough, sputum production)
- Actions taken in response to findings
- Provider notification if applicable, including time, provider name, and response
Sample Documentation Entries
Normal Assessment:
“Respiratory assessment performed with patient seated upright. RR 16/min, regular, unlabored. SpO₂ 98% on room air. No accessory muscle use. Breath sounds clear to auscultation bilaterally in all fields — vesicular sounds in peripheral fields, bronchovesicular sounds at 1st–2nd ICS. No adventitious sounds noted. No cough. Patient denies dyspnea or chest discomfort.”
Abnormal Assessment:
“Respiratory assessment performed with patient supine (unable to sit due to hip fracture). RR 24/min, shallow. SpO₂ 91% on 2L NC, down from 96% one hour ago. Mild use of accessory muscles. Breath sounds: diminished in bilateral bases; fine crackles heard bilaterally from scapular angle to bases, left > right; no wheeze or rhonchi. Patient reports increasing dyspnea and orthopnea. Findings reported to Dr. Johnson at 1430 — new orders obtained for chest X-ray and furosemide 40 mg IV.”
SBAR Communication for Respiratory Changes
When notifying providers of respiratory assessment changes, use the SBAR framework:
- S – Situation: “I’m calling about Mr. Torres in room 412. He is experiencing increased respiratory distress.”
- B – Background: “He is POD #2 from laparoscopic appendectomy. Baseline SpO₂ was 96% on room air. He has a 20-pack-year smoking history.”
- A – Assessment: “His SpO₂ has dropped to 89% on 2L NC. RR is 26, labored. I’m hearing bilateral coarse crackles at both bases. He appears anxious and is using accessory muscles.”
- R – Recommendation: “I’m concerned about pulmonary edema or pneumonia. I think he needs a chest X-ray, ABG, and we may need to increase his O₂. Can you come evaluate him?”
Module 8: Special Populations
Overview
Lung auscultation technique and interpretation require adaptation across the lifespan and in patients with specific clinical conditions.
Pediatric Patients
Children present unique auscultation challenges:
- Acoustic transmission: Children’s thoracic walls are thinner and more compliant, meaning breath sounds are transmitted more easily across the entire chest. A focal finding in an adult may be heard throughout a child’s chest, making localization difficult.
- Normal RR: Respiratory rates are higher in children — neonates breathe 40–60/min, infants 30–40/min, toddlers 24–40/min, school-age children 18–30/min, adolescents 12–20/min. Document using age-appropriate norms.
- Stethoscope size: Use a pediatric diaphragm for children to improve localization. Standard adult diaphragms span multiple lung regions in small children.
- Cooperation: Distract infants and toddlers with pacifiers or toys. Auscultate while the infant is quiet or during feeding when possible. Crying increases RR and may mask abnormal sounds — note in documentation if the child was crying during assessment.
- Common conditions: Bronchiolitis (RSV) produces widespread expiratory wheezes and crackles; croup produces inspiratory stridor; pneumonia may produce focal crackles and bronchial sounds.
Geriatric Patients
- Physiological changes: Aging lung tissue loses elasticity, thoracic compliance decreases, and respiratory muscle strength declines. Expect lower baseline breath sound intensity.
- Kyphosis and chest wall changes: Scoliosis and kyphosis can create asymmetric chest expansion and unequal breath sound intensity without pathology.
- Decreased cough reflex: Older adults may aspirate silently — be alert for unilateral crackles at the right lower lobe following meals.
- Polypharmacy: Multiple medications (beta-blockers, ACE inhibitors) can contribute to cough and altered respiratory sounds.
- Pulmonary fibrosis: More common in older adults; bilateral basilar “Velcro” crackles in an older patient with dry cough suggest this diagnosis.
Bariatric Patients
- Positioning: Elevate the head of the bed 30–45° or place in reverse Trendelenburg to optimize diaphragm excursion. Pannus (abdominal adipose tissue) limits diaphragmatic descent.
- Sound transmission: Increased body habitus attenuates sound. Sounds may be markedly diminished even in the absence of pathology.
- Effort required: May need patient to take deeper breaths. Document position and patient effort.
- OSA considerations: Snoring and airway obstruction patterns are more common; assess for signs of hypoventilation.
Post-Operative Patients
- Atelectasis risk: The most common post-operative pulmonary complication. Fine crackles at bases that appear or worsen following surgery should trigger incentive spirometry encouragement and deep breathing exercises.
- Pain management: Splinting (voluntary breath limitation due to incisional pain) decreases breath sounds and promotes atelectasis. Adequate analgesia is essential for respiratory recovery.
- Monitoring: Auscultate at minimum every 4 hours in the immediate post-operative period. Detect declining breath sounds before hypoxia develops.
- Incentive spirometry: Teach pre-operatively and reinforce post-operatively. Goal is to prevent alveolar collapse through sustained maximal inspiration.
Patients on Mechanical Ventilation
- ETT placement confirmation: Following intubation, auscultate bilaterally and over the epigastrium immediately to confirm correct endotracheal tube placement. Equal bilateral breath sounds = correct placement. Epigastric sounds = esophageal intubation (remove immediately). Unilateral sounds only = right mainstem intubation (withdraw tube 1–2 cm and reassess).
- Ongoing assessment: Auscultate at beginning of each shift and after any position change, tube repositioning, or suction event.
- Secretions: Coarse crackles and rhonchi in ventilated patients often indicate retained secretions requiring suctioning.
Module 9: NCLEX-Style Practice Questions
The following questions are formatted in the NCLEX-NG Clinical Judgment Measurement Model style to support test preparation and clinical reasoning development.
Question 1
A nurse is auscultating the lungs of a 68-year-old male with a history of heart failure who presents with increasing dyspnea and weight gain of 4 kg over the past week. The nurse hears bilateral fine crackles at both lung bases that do not clear with coughing. Which of the following is the most appropriate first action?
A. Encourage the patient to cough and deep breathe
B. Notify the provider and document findings
C. Place the patient in the prone position
D. Administer a scheduled bronchodilator
Answer: B
Explanation: Bilateral fine crackles at lung bases in a patient with known heart failure and rapid weight gain are consistent with pulmonary edema from fluid overload. The priority action is provider notification so that interventions (diuresis, positioning, supplemental O₂) can be ordered. While coughing and deep breathing are useful for atelectasis, crackles from pulmonary edema will not clear with coughing. Prone positioning is used in ARDS management and is not the first-line action here. Bronchodilators address bronchospasm, not pulmonary edema.
Question 2
A nurse is assessing a 7-year-old admitted for an acute asthma exacerbation. On initial assessment, the child is in tripod position, using accessory muscles, and appears anxious. When the nurse auscultates the lungs, breath sounds are noted to be absent bilaterally. Which response is most appropriate?
A. Document “breath sounds clear” and continue monitoring
B. Encourage slow, deep breathing and reassess in 30 minutes
C. Recognize this as a potential respiratory emergency and activate the rapid response team
D. Administer a scheduled oral corticosteroid and monitor response
Answer: C
Explanation: A “silent chest” — absent breath sounds in a patient with active asthma exacerbation — is a medical emergency indicating severely impaired airflow. This finding signals impending respiratory arrest. The nurse must immediately activate the rapid response team and prepare for escalating interventions including IV bronchodilators and possible intubation. Documenting as “clear” is dangerous and incorrect. Encouraging deep breathing and waiting 30 minutes could be fatal. Oral corticosteroids have a delayed onset and are insufficient for this emergency.
Question 3
A nurse is performing post-operative assessment on a patient who underwent abdominal surgery 18 hours ago. The patient reports sharp right-sided chest pain that worsens with inspiration and rates it 7/10. Auscultation reveals a coarse, grating sound over the right lateral chest that is present in both inspiration and expiration but disappears when the patient briefly holds their breath. Which sound is the nurse most likely hearing?
A. Coarse crackles secondary to pneumonia
B. Pleural friction rub from pleuritis
C. Rhonchi from retained secretions
D. Pericardial friction rub from pericarditis
Answer: B
Explanation: The sound described — coarse, grating, present in both inspiratory and expiratory phases, and disappearing when the patient holds their breath — is characteristic of a pleural friction rub. It results from inflamed pleural surfaces rubbing against each other. The pleuritic chest pain (worsens with inspiration) further supports this finding. Crackles are discontinuous popping sounds. Rhonchi are continuous, low-pitched, and typically change with coughing. A pericardial friction rub would persist through breath-holding because it is generated by cardiac motion.
Question 4
While assessing a 45-year-old patient with pneumonia confirmed by chest X-ray in the right lower lobe, the nurse asks the patient to say “EEE” while auscultating over the right posterior lower lobe. The nurse hears a sound that resembles “AAA.” How should the nurse document this finding?
A. Pleural friction rub in the right lower lobe
B. Positive egophony in the right lower lobe consistent with consolidation
C. Normal bronchovesicular sounds in the right lower lobe
D. Resonant percussion note in the right lower lobe
Answer: B
Explanation: Egophony is a vocal resonance maneuver in which the patient says “EEE” and the examiner auscultates over a suspected area of consolidation. When consolidation is present, sound transmits through solid tissue more efficiently, causing the “EEE” sound to be heard as “AAA” — a bleating, nasal quality. This finding confirms the presence of consolidation in the right lower lobe, consistent with the pneumonia diagnosis. A pleural friction rub has a different sound character and is not related to vocal resonance.
Question 5
A nurse is caring for a patient following a right-sided thoracentesis performed 30 minutes ago to drain a large pleural effusion. The patient suddenly develops sharp right-sided chest pain, progressive dyspnea, and tachycardia. Which auscultation finding would the nurse most expect to detect?
A. Bilateral fine crackles in all fields
B. Absent or markedly diminished breath sounds on the right
C. Diffuse expiratory wheezes bilaterally
D. Right-sided pleural friction rub
Answer: B
Explanation: The clinical picture — sudden onset of chest pain, dyspnea, and tachycardia following thoracentesis — is consistent with iatrogenic pneumothorax, a known complication of pleural procedures. In pneumothorax, air enters the pleural space and causes lung collapse on the affected side. Auscultation would reveal absent or markedly diminished breath sounds on the affected (right) side. Fine crackles are associated with fluid-related conditions, not pneumothorax. Diffuse wheezes indicate bronchospasm. A pleural friction rub is associated with pleuritis, not pneumothorax.
Question 6
A nurse is auscultating the lungs of a patient with severe COPD. The nurse hears low-pitched, continuous, snoring-quality sounds in both lung fields during expiration. When the patient coughs, the sounds partially clear. Which adventitious sound is the nurse most likely auscultating?
A. Fine crackles
B. Stridor
C. Rhonchi
D. Wheeze
Answer: C
Explanation: Rhonchi are low-pitched, continuous, snoring or gurgling sounds produced by secretions moving in larger airways (trachea, main bronchi). A hallmark characteristic is that rhonchi may partially clear or change with coughing — distinguishing them from crackles (which do not clear) and wheezes (which may partially clear but are high-pitched and musical). Stridor is high-pitched, predominantly inspiratory, and associated with upper airway obstruction. Fine crackles are discontinuous and high-pitched.
Question 7
The nurse is conducting a respiratory assessment and wants to assess the right lower lobe most accurately. Which location should the nurse place the stethoscope?
A. 2nd intercostal space, right midclavicular line (anterior)
B. Over the right lateral chest at the 4th intercostal space
C. Posterior chest, below the right scapular angle at the paravertebral line
D. Over the right manubrium, superior to the sternal angle
Answer: C
Explanation: The posterior chest provides the best access to the lower lobes. Placing the stethoscope below the scapular angle at the paravertebral line on the right posterior chest directly overlies the right lower lobe. The 2nd ICS right MCL overlies the right upper lobe anteriorly. The lateral 4th ICS overlies the right middle lobe. The manubrium is the auscultation site for bronchial sounds and is not specific to any lower lobe.
Question 8
A nurse is caring for a patient who underwent oral and maxillofacial surgery and is now in the PACU. The patient is making a high-pitched, harsh crowing sound audible without a stethoscope, occurring primarily on inspiration. The patient’s oxygen saturation has dropped from 99% to 88% in the last five minutes. Which action should the nurse take first?
A. Apply supplemental oxygen and encourage the patient to cough
B. Recognize stridor as a sign of upper airway obstruction and activate the rapid response team immediately
C. Reposition the patient to a left lateral position
D. Administer a scheduled nebulized bronchodilator treatment
Answer: B
Explanation: Stridor is a high-pitched, inspiratory sound produced by partial upper airway obstruction. In a post-operative maxillofacial surgery patient with rapidly falling SpO₂, stridor indicates airway compromise — potentially from edema, hematoma, laryngospasm, or structural obstruction. This is a life-threatening emergency requiring immediate activation of the rapid response team and airway management preparation. While repositioning can relieve mild obstruction, the severity here (SpO₂ dropping to 88%) mandates immediate team activation. Bronchodilators address lower airway bronchospasm, not upper airway obstruction.
Course Summary
Lung auscultation is a high-yield, high-frequency clinical skill that directly impacts patient safety, clinical reasoning, and care quality. Mastery requires:
- Anatomical knowledge: Understanding which lobe lies beneath each auscultation site.
- Technical proficiency: Correct stethoscope use, patient preparation, and systematic sequence.
- Discriminative listening: The ability to characterize sounds by type, timing, pitch, intensity, and location.
- Clinical reasoning: Integrating auscultation findings with history, vital signs, SpO₂, and other data.
- Communication skills: Precise documentation and SBAR-structured provider notification.
- Adaptation: Modifying technique and interpretation standards for pediatric, geriatric, bariatric, and mechanically ventilated patients.
The nurse who auscultates systematically, describes findings precisely, and acts on abnormal findings promptly is practicing at the highest level of professional nursing — saving lives, preventing complications, and upholding the standard of care.
Key Terms
| Term | Definition |
|---|---|
| Auscultation | Listening to internal body sounds with a stethoscope as a physical examination technique |
| Adventitious sounds | Abnormal breath sounds superimposed on or replacing normal breath sounds |
| Vesicular sounds | Soft, low-pitched normal breath sounds heard over peripheral lung fields |
| Bronchial sounds | High-pitched, loud normal breath sounds heard over the manubrium; abnormal in peripheral fields |
| Bronchovesicular sounds | Medium-pitched, medium-intensity sounds normal at 1st–2nd ICS and interscapular region |
| Crackles (rales) | Discontinuous, popping adventitious sounds from fluid or collapsed alveoli opening |
| Wheeze | Continuous, high-pitched, musical adventitious sound from narrowed airways |
| Rhonchi | Continuous, low-pitched, snoring adventitious sounds from secretions in large airways |
| Stridor | Loud, high-pitched, inspiratory sound from upper airway obstruction — always a warning sign |
| Pleural friction rub | Coarse, grating adventitious sound from inflamed pleural surfaces rubbing together |
| Egophony | ”E to A” change on auscultation indicating consolidation in underlying lung tissue |
| Atelectasis | Collapse or incomplete expansion of alveoli or a lung segment |
| Consolidation | Replacement of air in alveoli with fluid, cells, or exudate (as in pneumonia) |
| Silent chest | Absence of expected breath sounds in a patient with severe bronchospasm — respiratory emergency |
| Tactile fremitus | Vibration of the chest wall felt with the hands during spoken voice sounds |
References and Further Reading
- Bickley, L. S. (2021). Bates’ Guide to Physical Examination and History Taking (13th ed.). Wolters Kluwer.
- Jarvis, C. (2020). Physical Examination and Health Assessment (8th ed.). Elsevier.
- American Association of Colleges of Nursing. (2021). The Essentials: Core Competencies for Professional Nursing Education. AACN.
- National Council of State Boards of Nursing. (2023). NCLEX-RN Examination: Test Plan. NCSBN.
- Bohadana, A., Izbicki, G., & Kraman, S. S. (2014). Fundamentals of lung auscultation. New England Journal of Medicine, 370(8), 744–751.
- Sovijärvi, A. R. A., Vanderschoot, J., & Earis, J. (2000). Standardization of computerized respiratory sound analysis. European Respiratory Review, 10(77), 585–649.
- Patel, K., & Mukherjee, S. (2023). Auscultation of the respiratory system. In StatPearls. StatPearls Publishing.
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