Year: 2026

The SA Node is the heart’s natural pacemaker. It is an anatomy structure made of specialized electrical cells in the right atrium. It initiates most normal heartbeats and helps set resting and exercise heart rate. It is commonly discussed in electrocardiogram (ECG) interpretation, arrhythmias, and pacemaker decisions.

The Cardiac Conduction System is the heart’s built-in electrical wiring that initiates and coordinates each heartbeat. It is an anatomy and physiology topic (not a disease) that explains how heart rhythm is generated and transmitted. It is commonly encountered in cardiology through the electrocardiogram (ECG), arrhythmia evaluation, and pacing decisions. Understanding it helps connect symptoms like palpitations or fainting to specific rhythm mechanisms.

Heave is a palpable, sustained lifting impulse felt on the chest wall during cardiac palpation. It is a **physical examination sign**, not a diagnosis by itself. Heave is commonly discussed in cardiology when assessing **ventricular enlargement or pressure overload**, especially involving the right ventricle. It is most often encountered during a bedside cardiovascular exam alongside the apex beat, thrills, and heart sounds.

Thrill is a palpable vibration felt on the skin over the heart or a blood vessel. It is a **physical exam sign**, not a diagnosis. Thrill usually reflects **turbulent blood flow** and is often associated with a loud murmur or high-flow vascular lesion. It is commonly encountered during **cardiac auscultation and palpation** in valvular disease, congenital shunts, and vascular access assessment.

Point of Maximal Impulse is the spot on the chest wall where the heartbeat is felt most strongly on palpation. It is a physical examination finding and a bedside sign rather than a disease or test. It most often reflects the outward motion of the left ventricle (LV) during systole. It is commonly assessed during the cardiac exam in clinics, emergency settings, and inpatient care.

Cardiac Auscultation is listening to the heart’s sounds with a stethoscope as part of the physical examination. It is a bedside clinical test and a core examination skill in cardiology and general medicine. It is commonly used when evaluating chest pain, shortness of breath, palpitations, syncope, murmurs, or heart failure. It helps clinicians decide what diagnoses are plausible and what confirmatory tests may be needed.

Vasodilators are drugs that relax blood vessel smooth muscle and widen (dilate) arteries, veins, or both. They are a medication category commonly used in cardiology and internal medicine. They are encountered in conditions like hypertension (high blood pressure), angina (chest pain from myocardial ischemia), heart failure, and pulmonary hypertension. They are also used in some diagnostic settings, such as pharmacologic cardiac stress testing.

Vasopressors are drugs that raise blood pressure by increasing vascular tone. They are a medication category used in acute care, not a diagnosis or a test. They are commonly encountered in cardiology when hypotension threatens organ and coronary perfusion. They are often used in intensive care units (ICUs), emergency departments, and peri-procedural settings.

Inotropic Agents are drugs that change how strongly the heart muscle contracts. They are a medication category commonly used in acute cardiovascular care. In cardiology, they are most often encountered in intensive care units (ICUs), emergency settings, and perioperative cardiac care. They are typically used when the body needs better cardiac output to support organ perfusion.

A Swan Ganz Catheter is a balloon-tipped catheter used to measure pressures and blood flow inside the heart and lungs. It is a **device** used for **invasive hemodynamic monitoring**. It is most commonly encountered in critical care cardiology, cardiac surgery, and advanced heart failure care. It helps clinicians interpret shock states, complex heart failure, and pulmonary vascular disease physiology.