Pulse Pressure is the difference between systolic blood pressure (SBP) and diastolic blood pressure (DBP). It is a hemodynamic measure used in cardiovascular physiology and clinical assessment. It is commonly discussed during vital sign interpretation, bedside monitoring, and risk assessment. It helps clinicians think about stroke volume, arterial compliance, and overall circulatory status.

Diastolic Pressure is the lower number in a blood pressure reading (for example, “120/80”), measured in millimeters of mercury (mmHg). It reflects the arterial pressure during cardiac diastole, when the ventricles relax and fill. It is a core physiologic concept used in cardiovascular examination, emergency care, and chronic disease management. It is most commonly assessed with a blood pressure cuff (sphygmomanometer) or an intra-arterial catheter in critical care.

Systolic Pressure is the peak arterial pressure generated during ventricular systole. It is a core cardiovascular physiology concept and a standard vital sign in clinical medicine. It is commonly measured as part of blood pressure assessment in outpatient care, inpatient monitoring, and emergency triage. It is used in risk assessment, hemodynamic evaluation, and treatment monitoring across many cardiac and non-cardiac conditions.

Blood Pressure is the force of circulating blood against arterial walls. It is a core cardiovascular physiology concept and a routinely measured clinical vital sign. It is used in diagnosis, risk assessment, and monitoring across acute and chronic care. It is most commonly assessed with a cuff device or, in selected settings, an arterial catheter.

Heart Rate is the number of heartbeats per minute. It is a core physiologic vital sign used in acute care, outpatient medicine, and perioperative monitoring. It reflects cardiac electrical activation and mechanical pumping in the cardiovascular system. It is commonly assessed by pulse examination, electrocardiogram (ECG), and continuous monitoring.

Ejection Fraction is a measurement of how much blood a ventricle ejects with each heartbeat. It is most commonly discussed for the left ventricle in cardiovascular physiology and heart failure. It is used in diagnostic testing, risk stratification, and longitudinal monitoring. It is typically reported on echocardiography, but can also be assessed by cardiac magnetic resonance imaging and other modalities.

Stroke Volume is the amount of blood the heart ejects from a ventricle with each heartbeat. It is a core cardiovascular physiology concept used to describe pumping performance and hemodynamics. It is commonly discussed in heart failure, shock, valvular disease, and perioperative or critical care monitoring. It is also used when interpreting echocardiography, cardiac magnetic resonance imaging, and invasive catheter-based measurements.

Cardiac Output is the volume of blood the heart pumps per minute. It is a core cardiovascular physiology concept used in hemodynamics and acute care. It links bedside findings to conditions like shock and heart failure. It is commonly estimated or measured using echocardiography and invasive monitoring in selected patients.

Inferior Vena Cava is the large vein that returns deoxygenated blood from the lower body to the heart. It is a core anatomy and physiology concept in cardiology, critical care, and vascular medicine. It is commonly discussed in volume assessment, venous thromboembolism, and imaging interpretation. It is also relevant in procedures that use central venous access, filters, or venous cannulation.

The Superior Vena Cava is a large central vein that returns deoxygenated blood to the heart. It is a core concept in cardiovascular anatomy and cardiopulmonary physiology. It is frequently discussed in acute care, imaging, central venous access, and cardiothoracic surgery. It becomes clinically important when it is obstructed, compressed, or used as a route for devices.