← Cardiopulmonary chapter index
THATPTGUY · FROM MY PT SCHOOL NOTES · QUICK REFERENCE (DRAFT)
Cardiopulmonary Quick Reference: Patterns, Devices & ECG
Use these comparisons to frame your clinical reasoning after reading the chapter explanations. The goal is recognizing what additional information matters—not diagnosing an emergency from a single symptom or number.
1. Different conditions may produce the same symptom
Obstructive: COPD and asthma may both involve expiratory airflow difficulty, but their causes and treatment differ. Restrictive: Interstitial, chest wall or neuromuscular factors may reduce lung volume. A low FVC alone does not establish restriction.
Fluid and infection: Pneumonia, atelectasis, pleural effusion and pulmonary edema are not interchangeable. A new change in breathlessness, chest symptoms, consciousness or oxygenation warrants assessment and medical coordination. Vascular: Pulmonary embolism and other thrombotic emergencies cannot be ruled out using Homan’s sign, a single SpO2 value or a single lung sound.
Does wheezing establish COPD, or do crackles establish heart failure?
Reasoning: No. Both sounds have multiple possible causes. Combine the entire history, clinical examination and relevant testing.
2. Know what a number or device represents
CO = heart rate × stroke volume. MAP = mean arterial pressure, not a universal mobility clearance. SpO2 estimates peripheral oxygen saturation, while PaCO2 measures arterial carbon dioxide tension. FiO2 refers to the fraction of inspired oxygen, not simply the oxygen flow dial.
Arterial, central venous and pulmonary artery catheters have different purposes. CPAP, pressure support, mandatory ventilation and PEEP describe different forms or properties of respiratory support. Pacemakers and ICDs have distinct indications and follow-up requirements. The PT’s role is to understand how these devices affect examination, communication and the activity setup—not independently alter settings or disconnect lines.
If a patient has a normal SpO2, is it safe to ignore new dizziness or abnormal blood-pressure response?
Reasoning: No. A single monitored variable cannot replace assessment of the person and their full clinical response.
3. Read ECG terminology in clinical context
The P wave corresponds to atrial depolarization, QRS predominantly to ventricular depolarization, and T wave to ventricular repolarization. A typical adult PR interval is around 0.12–0.20 seconds, but the ECG’s leads, paper speed and calibration must be verified.
A new rhythm concern, presyncope, chest discomfort or unstable response requires prompt assessment and the appropriate team response. Motion artifacts can mislead the monitor, while a reassuring-looking rhythm does not prove adequate mechanical circulation. Never infer a specific diagnosis from an isolated teaching strip.
Can a single-lead monitor prove or exclude myocardial infarction?
Reasoning: No. Interpret the patient’s condition and seek appropriate evaluation, including a diagnostic ECG and other medical testing when clinically indicated.
Apply it
A patient with a recent hospitalization has new resting breathlessness, new unilateral leg swelling and asks to complete their walking goal. Before considering routine exercise, assess and urgently communicate the new concerning findings through the team’s clinical pathway. Do not attempt to exclude a thrombus with a provocative calf test.
Source notes and boundaries
Drawn from the author’s Cardiopulmonary school lecture set and the three longer reference appendices in the companion manuscript. Updated references include GINA 2026, ASH VTE diagnostic guidance, and ECG clinical methods. Not a procedure guide, emergency triage protocol, official class resource or NPTE guarantee.
