Lungs and Thorax Essentials Summary & Study Notes

🫁 Lungs and Thorax Overview

Thorax encases the lungs and mediastinal structures; the mediastinum contains the esophagus, trachea, heart, and great vessels. The lungs are divided into lobes with anterior, posterior, and lateral surfaces covered by pleurae (parietal and visceral) with a potential pleural space.

💧 Edema and Assessment Clues

Edema grading ranges 1+ to 4+ and reflects skin taturity, peripheral circulation, and cardiac status. Mild pitting shows slight indentation with no perceptible swelling; 4+ is very deep with long-lasting indentation and gross swelling. Unilateral vs bilateral involvement and non-pitting edema help guide etiologies.

🫂 Respiratory Assessment Components

Key assessment elements include rate, depth, ease/quality of respirations, rhythm, and overall effort. Accurate documentation of these components informs respiratory status and guides interventions.

🗺️ Mediastinum and Pleurae

The mediastinum houses the esophagus, trachea, heart, and great vessels. The pleurae create a slippery, near-frictionless environment between the chest wall and lungs, with a potential space that can accumulate fluid or air in disease.

🧭 Thoracic Cage Anatomy

The anterior, posterior, and lateral dimensions of the thoracic cage shape the chest wall. Shape changes (such as increased AP diameter) and chest wall configuration influence breathing mechanics and expansion.

🫁 Lung Lobes and Surfaces

The lungs present with anterior, posterior, and lateral surfaces; the left lung has two lobes while the right has three. Lung expansion and ventilation occur through coordinated chest wall movement and diaphragmatic excursion.

🧠 Respiratory System Structures & Data Collection

Knowledge of airway structures, tracheobronchial tree, and surface anatomy supports effective auscultation, percussion, and palpation. Vital data such as history, risk factors, and immunization status shape assessment priorities.

🗣️ Health History - Subjective Data

Assess for cough, shortness of breath, chest pain with breathing, past infections, influenza immunization, smoking or vaping history, environmental exposures, and self-care behaviors (masking, hand hygiene, cough etiquette, avoiding pollutants).

👀 Inspection of the Thorax

Inspect the thoracic cage shape and configuration, anteroposterior/transverse diameter, positioning for breathing, skin color/condition, and the effort required to breathe. Visual inspection guides subsequent palpation and auscultation.

↔️ Compare and Contrast - Side-to-Side & Top-to-Bottom

A systematic side-to-side and top-to-bottom comparison helps identify asymmetries in movement, expansion, and symmetry of respiration.

🖐️ Palpation, Percussion, Expansion, and Percussion Notes

Palpate for symmetry, tactile fremitus, chest expansion, and chest wall vibrations. Percuss to assess note quality; normal resonance indicates aerated lungs. Use rotary palpation techniques for reliable results.

🗣️ Tactile Fremitus & Vocal Resonance

Vibrations detected by palpation increase with consolidated areas. Tests like the phrase “ninety-nine” or “blue moon” assess tactile fremitus and may reveal egophany when the voice sounds are abnormal.

🔊 Air Entry and Breath Sounds

Assess air entry bilaterally and listen for breath sounds: bronchial (loud, high-pitched over trachea), bronchovesicular (midfield), and vesicular (soft, low-pitched over lung periphery). Auscultation localizes abnormalities.

🎶 Adventitious Sounds

Identify crackles (fine or coarse), atelectatic crackles that clear with coughing, pleural friction rub, stridor, and wheezes (continuous sounds). Distinguish inspiratory vs expiratory onset and pitch.

📝 Clinical Documentation Example

Example notes may describe air entry as equal bilaterally, crackles in a lower left field that do not clear with coughing, and SpO2 levels; consider patient position, respirations, and arterial oxygenation in ongoing assessment.

🧳 Posterior Lungs & Anterior Chest Auscultation

Auscultation sites include posterior and anterior lung fields; systematic sequencing ensures comprehensive evaluation of lung sounds across regions.

📈 Pulse Oximetry & 6-Minute Walk

SpO2 interpretations require clinical context; 95% on room air is common, while 95% on supplemental oxygen indicates a different baseline. The 6-minute walk test assesses functional exercise capacity and endurance.

👵 Older Adults - Lung Changes

Aging lungs become more rigid and harder to inflate, with decreased vital capacity and increased residual volume. Alveolar surface changes and chest wall mechanics contribute to dyspnea on exertion.

🧭 Pathophysiology Overview

Common patterns include kyphosis, barrel chest, and scoliosis, which alter lung mechanics. Respiratory patterns like tachypnea, bradypnea, hyperventilation, hypoventilation, and Cheyne-Stokes respiration have diagnostic and prognostic significance.

🫖 Disease States & Preventive Care

Pathophysiology and assessment cover COPD, heart failure, pleural effusion, pneumothorax, pneumonia, and DVT risk for thoracic conditions. Prevention includes vaccination, smoking avoidance, masking in polluted environments, hand hygiene, and prompt infection care.

🧑‍⚕️ Providers & Investigations

Care teams include PCPs, hospitalists, pulmonologists, respiratory therapists, and imaging/functional tests like CXR, CT, and PFTs. Interpretation guides diagnosis and treatment planning.

🛡️ Health Promotion & Patient Education

Promote hydration, cough etiquette, vaccination, pollution avoidance, and mask use in contaminated areas. Education about self-care and early symptom reporting supports respiratory health.

🧭 Documentation Phrases

Use clear, concise phrasing for findings such as air entry, resonance, and adventitious sounds. Structured notes facilitate continuity of care and communication with the care team.

📝 NANDA Diagnoses (Examples)

Common diagnoses related to thoracic function include Ineffective airway clearance, Impaired gas exchange, and Activity intolerance. Align diagnoses with objective findings and patient goals.