13.1 Cardiopulmonary Assessment, Auscultation & Monitoring

13.1 Cardiopulmonary Assessment, Auscultation & Monitoring

[!NOTE] DHA Clinical Examination Benchmark: In acute care and cardiopulmonary physical therapy, candidates sitting for the Dubai Health Authority (DHA) Physiotherapist licensure examination are rigorously tested on systematic chest examination, diagnostic auscultation, vocal transmission acoustics, hemodynamic vital sign thresholds, Arterial Blood Gas (ABG) interpretation, and telemetry ECG analysis. High-yield exam questions frequently challenge candidates to differentiate consolidation from pleural effusion, recognize exertional blood pressure collapse, identify dangerous ventricular dysrhythmias, and calculate acid-base compensation.

Cardiopulmonary physical therapy begins with a meticulous clinical examination. Physical therapists in acute hospital wards, intensive care units (ICUs), and outpatient rehabilitation centers must rapidly synthesize observational, acoustic, hemodynamic, and laboratory data to make safe clinical decisions, identify contraindications to exertion, and direct targeted interventions.

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1. Systematic Chest Inspection & Breathing Patterns

Inspection begins the moment the clinician enters the room, assessing the patient's resting posture, thoracic architecture, work of breathing, and respiratory rate.

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|                         Systematic Chest Inspection Domains                       |
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| 1. Thoracic Structural Morphology:                                                |
|    - Anteroposterior (AP) to Transverse Diameter Ratio (Normal = 1:2)             |
|    - Barrel Chest (AP:Transverse = 1:1, Hyperinflation in COPD)                   |
|    - Pectus Excavatum (Funnel Chest) vs. Pectus Carinatum (Pigeon Chest)          |
|    - Thoracic Kyphoscoliosis (Restrictive Ventilatory Impairment)                 |
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| 2. Ventilatory Cadence & Pathological Breathing Patterns:                         |
|    - Eupnea (12-20 bpm, effortless, regular)                                      |
|    - Tachypnea (>20 bpm) vs. Bradypnea (<10 bpm)                                  |
|    - Cheyne-Stokes (Crescendo-Decrescendo with Central Apneas)                    |
|    - Kussmaul (Deep, Rapid, Regular Hyperventilation in Metabolic Acidosis)       |
|    - Paradoxical Breathing (Diaphragmatic Exhaustion / Flail Chest)               |
|    - Biot's Respiration (Ataxic, Irregular Tidal Breaths with Abrupt Apnea)       |
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| 3. Musculoskeletal Work of Breathing:                                             |
|    - Accessory Inspiratory Muscle Use: SCM, Scalenes, Pectoralis Minor, Trapezius |
|    - Expiratory Muscle Recruitment: Rectus Abdominis, Obliques, Transversus       |
|    - Intercostal, Supraclavicular, and Substernal Retractions                     |
|    - Nasal Flaring and Pursed-Lip Posturing                                       |
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Thoracic Structural Deformities

• Normal Thorax: The anteroposterior (AP) diameter is narrower than the transverse (lateral) diameter, establishing an AP-to-transverse ratio of approximately 1:2 (ranging from 0.70 to 0.75).
• Barrel Chest: The AP diameter expands to equal the transverse diameter (1:1 ratio). The ribs become horizontally oriented, the sternum projects forward, and the dorsal spine exhibits accentuated kyphosis. This structural change is secondary to chronic air trapping and persistent dynamic hyperinflation characteristic of advanced Chronic Obstructive Pulmonary Disease (COPD) and severe emphysema.
• Pectus Excavatum (Funnel Chest): Congenital depression or posterior displacement of the lower sternum and xiphoid process. Severe excavatum defects compress the right ventricle, reduce vital capacity, and cause restrictive ventilatory limitations during aerobic exercise.
• Pectus Carinatum (Pigeon Chest): Anterior protrusion of the sternum and adjacent costal cartilages, resembling the keel of a ship. This decreases chest wall compliance and increases the elastic work of breathing.
• Thoracic Kyphoscoliosis: Severe lateral curvature (scoliosis >40°) combined with dorsal hyperkyphosis, causing severe mechanical compression of lung parenchyma, asymmetrical alveolar hypoventilation, pulmonary hypertension, and restrictive lung disease.

Pathological Ventilatory Patterns

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2. Auscultation: Normal vs. Adventitious Sounds

Stethoscope examination evaluates airflow dynamics across the tracheobronchial tree and alveolar spaces. Auscultation must be performed directly on bare skin, moving systematically from lung apices to bases, comparing symmetrical left and right anatomical landmarks across anterior, posterior, and mid-axillary chest walls while the patient breathes deeply through an open mouth.

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|                    Classification of Normal Breath Sounds                         |
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| 1. Vesicular:                                                                     |
|    - Pitch: Low | Intensity: Soft, rustling | Location: Peripheral lung fields    |
|    - Timing: Inspiratory phase dominates; Expiration barely audible (I:E = 3:1)   |
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| 2. Bronchovesicular:                                                              |
|    - Pitch: Intermediate | Intensity: Moderate | Location: 1st/2nd ICS & Interscapular|
|    - Timing: Inspiratory and expiratory phases are equal in duration (I:E = 1:1)  |
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| 3. Bronchial:                                                                     |
|    - Pitch: High | Intensity: Loud, tubular, harsh | Location: Over Manubrium     |
|    - Timing: Expiratory phase is longer than inspiration (I:E = 1:2 to 1:3)       |
|    - Critical Gap: Distinct silent pause between inspiratory and expiratory sounds|
|    - ABNORMAL if heard over peripheral fields: Signifies LUNG CONSOLIDATION!      |
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| 4. Tracheal:                                                                      |
|    - Pitch: Very High | Intensity: Extremely loud, harsh | Location: Over Trachea |
|    - Timing: Inspiratory and expiratory phases are equal (I:E = 1:1)              |
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Adventitious (Abnormal) Breath Sounds

Adventitious sounds are extraneous acoustic signals superimposed over normal or diminished breath sounds:

                              ADVENTITIOUS BREATH SOUNDS
                                           │
                   ┌───────────────────────┴───────────────────────┐
                   ▼                                               ▼
        DISCONTINUOUS SOUNDS                            CONTINUOUS SOUNDS
      (Intermittent, explosive,                       (Musical, sustained,
       duration <20 milliseconds)                      duration >100-250 milliseconds)
                   │                                               │
         ┌─────────┴─────────┐                           ┌─────────┴─────────┐
         ▼                   ▼                           ▼                   ▼
   FINE CRACKLES       COARSE CRACKLES                WHEEZES             RHONCHI
- High-pitched, dry  - Low-pitched, wet,        - High-pitched, musical - Low-pitched, snoring
  Velcro-like pop      bubbling                   whistle (expiratory)    gurgling sound
- Late inspiration   - Early inspiration        - Bronchospasm in       - Secretions in large
- Small airway         and expiration             Asthma, COPD            central bronchi
  reopening          - Secretions in large      - Monophonic vs.        - Often clears with
- Pulmonary Fibrosis,  bronchi/fluid              Polyphonic              coughing
  early CHF,           (Pneumonia, Severe
  Atelectasis          Pulmonary Edema)

Comprehensive Adventitious Sound Characteristics

[!IMPORTANT] The Stethoscope Differential Rule:

• If bronchial breath sounds are auscultated over the apical or posterior base peripheral lung fields, normal spongy lung tissue has been replaced by solid, airless tissue (lobar consolidation from bacterial pneumonia or complete compressive atelectasis with a patent bronchus).
• If a scratchy sound is heard over the left lower sternal border, ask the patient to hold their breath. If the sound stops, it is a pleural friction rub. If the sound continues synchronizing with heartbeats, it is a pericardial friction rub (indicating acute pericarditis).

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3. Vocal Resonance & Voice Transmission Tests

Vocal resonance testing evaluates the transmission of spoken sound vibrations through the tracheobronchial tree, lung parenchyma, and chest wall to the stethoscope diaphragm. Acoustic physics dictates that sound waves travel faster and with significantly less acoustic damping through dense, solidified, consolidated tissue than through normal air-filled, spongy alveoli.

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|                    Vocal Resonance Examination Modalities                         |
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| 1. Egophony ("E-to-A" Test):                                                      |
|    - Patient repeatedly vocalizes "ee-ee-ee" while clinician auscultates.         |
|    - Normal Lung: Transmitted sound is muffled, soft, and maintains "ee" pitch.   |
|    - Consolidated Lung: Sound converts into a high-pitched, nasal, bleating       |
|      "ay-ay-ay" (like a goat bleat). Pathognomonic for lobar consolidation.       |
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| 2. Bronchophony:                                                                  |
|    - Patient repeats the phrase "ninety-nine" in a normal speaking voice.         |
|    - Normal Lung: Syllables sound indistinct, muffled, muffled hum.               |
|    - Consolidated Lung: Words sound distinct, clear, and loud under stethoscope.  |
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| 3. Whispered Pectoriloquy:                                                        |
|    - Patient whispers "one-two-three" or "ninety-nine".                          |
|    - Normal Lung: Whispered sounds are completely inaudible or faint, muffled hum.|
|    - Consolidated Lung: Whispered syllables are heard with striking clarity,      |
|      as if the patient were whispering directly into the clinician's ear.         |
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| 4. Tactile Fremitus:                                                              |
|    - Palpation with ulnar border of hands while patient repeats "ninety-nine".   |
|    - Increased Fremitus: Solid tissue / consolidation (dense medium).             |
|    - Decreased Fremitus: Air trapping, fluid insulation, or pleural separation    |
|      (Pleural effusion, pneumothorax, severe emphysema).                          |
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High-Yield Differential Diagnosis Matrix of Common Pulmonary Conditions

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4. Vital Signs Monitoring & Exercise Termination Criteria

During acute mobilization and cardiopulmonary rehabilitation, physical therapists maintain continuous surveillance over blood pressure (BP), heart rate (HR), oxygen saturation (SpO2), and electrocardiography (ECG). Standardized termination guidelines protect patients from acute decompensation, malignant arrhythmias, myocardial infarction, and cardiovascular collapse.

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|             Cardiopulmonary Rehabilitation Hemodynamic Safety Gates               |
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| RESTING CONTRAINDICATIONS TO EXERCISE INITIATION:                                 |
| - Resting Systolic BP >180-200 mmHg OR Resting Diastolic BP >100-110 mmHg         |
| - Resting Heart Rate >120 bpm (or <50 bpm with symptoms)                         |
| - Unstable Angina Pectoris within past 48 hours                                   |
| - Acute Systemic Infection with Fever (>38.0°C)                                   |
| - Acute Pulmonary Embolism, DVT, or Thrombophlebitis until anticoagulated        |
| - Severe Symptomatic Aortic Stenosis (Peak Gradient >40 mmHg, Area <1.0 cm²)      |
| - Acute Pericarditis, Myocarditis, or Suspected Dissecting Aortic Aneurysm        |
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| ABSOLUTE EXERCISE TERMINATION CRITERIA (STOP EXERCISE IMMEDIATELY):               |
| 1. Drop in Systolic BP >10 mmHg below baseline despite an increase in workload,   |
|    when accompanied by other clinical evidence of myocardial ischemia.            |
| 2. Moderate-to-severe Angina (≥ Grade 2 on the standard 1-4 Angina Scale).        |
| 3. Central Nervous System Signs: Ataxia, lightheadedness, near-syncope, confusion.|
| 4. Signs of Poor Perfusion: Pallor, cold/clammy diaphoresis, cyanosis.           |
| 5. Severe Desaturation: SpO2 drops <88% in normal patients (<85% in severe COPD). |
| 6. Technical inability to monitor ECG or systolic blood pressure.                 |
| 7. Patient requests to stop due to severe exhaustion or intolerable dyspnea.      |
| 8. Malignant Telemetry Changes: Sustained VT, STEMI (>1 mm), >6 PVCs/minute.     |
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| RELATIVE EXERCISE TERMINATION CRITERIA:                                           |
| - Exertional Hypertensive Surge: Systolic BP >250 mmHg OR Diastolic BP >115 mmHg  |
| - Progressive ST-segment depression (>2 mm horizontal or downsloping)             |
| - Supraventricular tachycardia (SVT), new atrial fibrillation with rapid rate     |
| - Development of bundle branch block or intraventricular conduction delay         |
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[!CAUTION] The Exertional Systolic Drop Trap: A normal cardiovascular response to incremental aerobic exercise is an increase in systolic blood pressure of 8–12 mmHg per MET of workload, driven by increased cardiac output, with diastolic BP remaining stable (±10 mmHg) due to peripheral vasodilation. If a patient's systolic blood pressure falls by >10 mmHg as exercise workload increases, it indicates severe pump dysfunction, extensive left ventricular ischemia, or critical multi-vessel coronary artery disease. This is an absolute indication to stop exercise immediately!

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5. Arterial Blood Gas (ABG) Interpretation Framework

Arterial blood gas testing provides instantaneous diagnostic insight into alveolar gas exchange, acid-base homeostasis, and metabolic balance. Physical therapists must interpret ABGs to understand a patient's physiological reserve, risk of ventilatory failure, and tolerance for physical exertion.

Reference Values

• pH: 7.35 - 7.45 (Acidemia: <7.35; Alkalemia: >7.45)
• PaCO2: 35 - 45 mmHg (Respiratory component; volatile acid controlled by alveolar ventilation)
• HCO3-: 22 - 26 mEq/L (Metabolic/renal component; basic buffer controlled by the kidneys)
• PaO2: 80 - 100 mmHg on room air (Mild hypoxemia: 60–79; Moderate: 40–59; Severe: <40 mmHg)
• SaO2: 95% - 100%

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|                     The 4-Step Systematic ABG Interpretation                      |
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| Step 1: Examine the pH (Determines Primary State)                                 |
|         - pH < 7.35 = Acidosis | pH > 7.45 = Alkalosis | pH 7.35-7.45 = Normal   |
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| Step 2: Examine the PaCO2 (Respiratory Parameter - Acidic Substance)              |
|         - PaCO2 > 45 mmHg = Acidic (Hypoventilation, CO2 retention)               |
|         - PaCO2 < 35 mmHg = Alkaline (Hyperventilation, CO2 blowout)              |
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| Step 3: Examine the HCO3 (Metabolic Parameter - Basic Substance)                  |
|         - HCO3 < 22 mEq/L = Acidic (Loss of base, accumulation of fixed acids)    |
|         - HCO3 > 26 mEq/L = Alkaline (Retention of base, alkali gain)             |
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| Step 4: Determine the Primary Derangement & Compensation Status (ROME Rule)       |
|         - ROME = Respiratory Opposite, Metabolic Equal                            |
|         - Uncompensated: pH abnormal, one system abnormal, one normal.            |
|         - Partially Compensated: pH abnormal, BOTH PaCO2 and HCO3 abnormal.       |
|         - Fully Compensated: pH NORMAL (7.35-7.45), BOTH PaCO2 and HCO3 abnormal. |
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Comprehensive Acid-Base Disturbance Matrix

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6. Electrocardiogram (ECG) Recognition & Arrhythmia Stopping Rules

Therapists in acute care and outpatient cardiac rehabilitation must monitor telemetry strips and recognize lethal vs. benign dysrhythmias.

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|                    ECG Rhythm Identification & Exercise Rules                     |
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| 1. Normal Sinus Rhythm (NSR):                                                     |
|    - Rate: 60-100 bpm | Regular cadence | P wave precedes every QRS               |
|    - PR Interval: 0.12-0.20 sec | QRS Duration: <0.12 sec (narrow)                |
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| 2. Sinus Bradycardia (<60 bpm) & Sinus Tachycardia (>100 bpm):                    |
|    - Normal morphology; safe to exercise unless symptomatic (syncope/chest pain)  |
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| 3. Atrial Fibrillation (AFib):                                                    |
|    - No distinct P waves (chaotic fibrillatory waves) | Irregularly irregular QRS |
|    - Uncontrolled Ventricular Response (>100-110 bpm): CONTRAINDICATION TO EXERCISE|
|    - Controlled AFib (resting HR <100 bpm, anticoagulated): Permitted with monitor |
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| 4. Premature Ventricular Contractions (PVCs):                                     |
|    - Ectopic ventricular focus: Early, wide (>0.12s), bizarre QRS, no P wave      |
|    - Exercise Stopping Rules:                                                     |
|      * Frequency >6 PVCs per minute                                               |
|      * Multifocal PVCs (different shapes from multiple ventricular foci)          |
|      * Couplets (2 consecutive PVCs) or Triplets (3 consecutive PVCs)             |
|      * PVC falls on the preceding T wave (R-on-T phenomenon -> risks VFib!)       |
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| 5. Ventricular Tachycardia (VT):                                                  |
|    - Run of ≥3 consecutive PVCs at rate >100-150 bpm (wide, uniform or polymorphic|
|    - IMMEDIATE TERMINATION & CODE BLUE: High risk of hemodynamic collapse / arrest |
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| 6. Ventricular Fibrillation (VFib):                                               |
|    - Chaotic, undulating baseline without discernible QRS complexes               |
|    - NO CARDIAC OUTPUT -> MEDICAL EMERGENCY: Immediate CPR and Defibrillation!   |
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| 7. Myocardial Ischemia vs. Infarction:                                            |
|    - ST Depression: ≥1-2 mm horizontal or downsloping ST-segment depression below |
|      isoelectric baseline indicates SUBENDOCARDIAL ISCHEMIA -> STOP EXERCISE!     |
|    - ST Elevation: ≥1 mm ST-segment elevation above isoelectric line indicates    |
|      ACUTE TRANSMURAL MYOCARDIAL INFARCTION (STEMI) -> IMMEDIATE CODE / ER!       |
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7. Clinical Scenarios & DHA Exam Traps

Clinical Scenario: Acute Inpatient Post-Surgical Assessment

A 68-year-old male who underwent open abdominal colectomy 3 days ago is referred for chest physical therapy and ambulation. On evaluation, he is tachypneic at 26 breaths/min, shallow, and splinting his right lower abdomen. Auscultation reveals bronchial breath sounds over the right lung base posteriorly, accompanied by late-inspiratory fine crackles and dullness to percussion. Vocal resonance testing reveals that when the patient whispers "one-two-three", the words are heard with crystal clarity through the stethoscope over the right base. His ABG reveals: pH 7.31, PaCO2 52 mmHg, HCO3 25 mEq/L, and PaO2 68 mmHg.

• Diagnostic Synthesis: The combination of bronchial breath sounds, dull percussion, whispered pectoriloquy, and fine crackles over the right lower lobe confirms lobar consolidation with acute atelectasis.
• ABG Analysis: The pH of 7.31 reflects acidemia; PaCO2 of 52 mmHg is elevated (respiratory acidosis); HCO3 of 25 mEq/L is normal. This represents acute uncompensated respiratory acidosis with moderate hypoxemia caused by shallow post-operative splinting.
• Physical Therapy Strategy: Immediate aggressive incentive spirometry, thoracic expansion exercises with breath holds, supported splinted coughing, and upright sitting to reverse hypoventilation.

DHA Exam Traps to Avoid

• Trap 1: Bronchial Sounds Misinterpretation: Exam questions frequently ask what it means when "tubular, harsh, high-pitched breath sounds with a long expiratory phase" are heard over the left lung base. Candidates often mistakenly answer "normal vesicular breathing" or "bronchial asthma." Normal bronchial sounds exist only over the sternal manubrium; hearing them over peripheral lung fields is always abnormal and indicates tissue consolidation.
• Trap 2: Fully Compensated ABG Identification: Candidates frequently forget that in fully compensated acid-base disorders, the pH is within the normal range (7.35–7.45). If the pH is 7.32, PaCO2 is 60, and HCO3 is 32, it is partially compensated, not fully compensated. It only becomes fully compensated when renal retention of bicarbonate successfully restores pH to ≥7.35.
• Trap 3: Exertional Blood Pressure Response: When a question states that a cardiac patient's systolic blood pressure drops from 140 to 128 mmHg as treadmill speed increases, the correct action is never to have the patient drink water, rest for 30 seconds and continue, or speed up the treadmill. An exertional SBP drop >10 mmHg is an absolute exercise termination criterion reflecting impending cardiogenic shock or severe left main coronary disease.