Lung Sounds Course

Lesson 1 • Upper Airway Structures

Covers the nasal cavity, pharynx, larynx, and trachea as sound-generating and sound-transmitting structures. Establishes the pathway sounds travel before reaching the lungs.

Lesson 2 • Lower Airway and Lung Architecture

Examines bronchi, bronchioles, alveoli, and lung lobes. Connects structural divisions to the surface regions where sounds are auscultated.

Lesson 3 • Respiratory Muscles and Mechanics

Explains diaphragm, intercostal, and accessory muscle roles in breathing. Muscle activity directly influences the intensity and character of auscultated sounds.

Lesson 1 • Sound Transmission Through Tissues

Analyzes how sound travels through air-filled lung, consolidated tissue, fluid, and chest wall. Tissue density changes alter sound quality and guide pathology interpretation.

Lesson 2 • Fundamentals of Sound Waves

Introduces frequency, amplitude, wavelength, and resonance as they apply to biological sounds. These properties define pitch, loudness, and timbre heard through a stethoscope.

Lesson 3 • Stethoscope Acoustics and Design

Compares diaphragm and bell modes, electronic amplification, and noise filtering. Proper device selection and technique maximize diagnostic signal quality.

Lesson 1 • Stethoscope Placement and Pressure

Explains correct skin contact, pressure variation between diaphragm and bell, and avoiding hair artifact. Placement errors are a leading cause of misidentified sounds.

Lesson 2 • Patient Preparation and Positioning

Covers optimal patient posture, clothing removal, and breathing instructions before auscultation. Proper setup reduces artifact and improves sound transmission to the stethoscope.

Lesson 3 • Documenting Auscultation Findings

Introduces standardized terminology and anatomical notation for recording breath sounds. Accurate documentation enables communication and longitudinal comparison of findings.

Lesson 1 • Bronchovesicular Breath Sounds

Examines the intermediate sounds heard near the mainstem bronchi and upper sternal borders. These transitional sounds bridge vesicular and bronchial characteristics.

Lesson 2 • Breath Sound Intensity Variations

Addresses physiological factors that increase or decrease normal sound intensity without pathology. Recognizing benign intensity variation prevents over-diagnosis of abnormality.

Lesson 3 • Bronchial Breath Sounds

Covers the loud, high-pitched, hollow sounds normally heard over the trachea and manubrium. Understanding their normal location prevents misclassification when heard peripherally.

Lesson 1 • Clinical Correlation of Continuous Sounds

Applies continuous sound findings to conditions such as asthma, COPD, croup, and foreign body obstruction. Integrates sound patterns with clinical context for accurate assessment.

Lesson 2 • Wheezes: Characteristics and Causes

Defines wheezes as high-pitched, musical, continuous sounds caused by narrowed airway oscillation. Differentiates monophonic from polyphonic patterns and links each to underlying pathology.

Lesson 3 • Rhonchi: Low-Pitched Continuous Sounds

Characterizes rhonchi as low-pitched, snoring-quality sounds from secretions in large airways. Distinguishes rhonchi from wheezes and explains their response to coughing.

Lesson 1 • Differentiating Discontinuous Sound Types

Provides a systematic framework for distinguishing fine crackles, coarse crackles, and pleural rubs using timing, pitch, and response to maneuvers. Reduces diagnostic error in complex presentations.

Lesson 2 • Coarse Crackles: Characteristics and Causes

Characterizes coarse crackles as loud, low-pitched, early-inspiratory sounds from secretion movement in larger airways. Links them to bronchiectasis, pulmonary edema, and pneumonia.

Lesson 3 • Pleural Friction Rub

Identifies the pleural friction rub as a grating, leathery sound from inflamed pleural surfaces rubbing together. Distinguishes it from crackles by its biphasic timing and lack of cough response.

Lesson 1 • Emergency Recognition of Absent Sounds

Focuses on tension pneumothorax, massive hemothorax, and complete obstruction as emergencies presenting with absent sounds. Rapid recognition and response protocols are emphasized.

Lesson 2 • Causes of Diminished Breath Sounds

Examines airway obstruction, pleural effusion, pneumothorax, and hyperinflation as causes of reduced sound transmission. Each mechanism produces a distinct clinical and auscultatory profile.

Lesson 3 • Unilateral Versus Bilateral Reduction

Contrasts unilateral sound absence, suggesting localized pathology, with bilateral reduction indicating systemic or diffuse disease. Laterality guides urgency and differential diagnosis.

Lesson 1 • Building a Differential Diagnosis

Applies a structured reasoning framework to generate and rank differential diagnoses from combined assessment data. Prioritizes life-threatening conditions at the top of every differential.

Lesson 2 • Inspection, Palpation, and Percussion

Reviews chest inspection for deformity and use of accessory muscles, palpation for fremitus, and percussion for resonance changes. These findings contextualize and confirm auscultation data.

Lesson 3 • Communicating Findings to the Care Team

Teaches structured verbal and written reporting of respiratory assessment findings using standardized formats. Clear communication reduces handoff errors and supports coordinated care.

Lesson 4 • Combining Auscultation with History

Integrates symptom onset, duration, smoking history, and occupational exposure with sound findings. History narrows the differential before physical examination begins.