Year: 2026

Preload is a hemodynamic concept that describes how much the heart muscle is stretched before it contracts. It is a physiology term rather than a disease, test, or medication. In cardiology, Preload is most often discussed in heart failure, shock, and critical care fluid management. It helps connect bedside findings to cardiac output and congestion.

Cardiac Index is a hemodynamic measurement that describes cardiac output adjusted for body size. It is a physiologic parameter (not a symptom or diagnosis) used to estimate how effectively the heart delivers blood relative to the patient’s body surface area. It is commonly encountered in intensive care, the cardiac catheterization lab, perioperative monitoring, and advanced heart failure care. It helps clinicians interpret “how much flow” is present in context, rather than relying on cardiac output alone.

Ejection Fraction is a measurement of how much blood a ventricle pumps out with each heartbeat. It is a cardiac imaging and physiology metric, not a symptom or a diagnosis by itself. It is most often reported for the left ventricle and commonly appears on echocardiograms and cardiac magnetic resonance reports. It is used frequently in heart failure, cardiomyopathy, valvular disease, and post–myocardial infarction assessments.

Stroke Volume is the amount of blood the heart ejects from a ventricle with each beat. It is a physiologic measurement and a core hemodynamic parameter. It is commonly discussed in echocardiography, cardiac catheterization, and critical care monitoring. It helps connect basic cardiac physiology to clinical decision-making in cardiology.

Cardiac Output is the amount of blood the heart pumps into the circulation each minute. It is a physiologic measurement, not a disease or a symptom. It is commonly discussed in heart failure, shock, valvular disease, and critical care cardiology. It connects bedside findings to hemodynamics and organ perfusion.

Coronary Calcium Score is a **score** derived from a specialized computed tomography (CT) scan of the heart. It estimates the amount of **calcified atherosclerotic plaque** in the coronary arteries. It is commonly encountered in cardiology as a tool for **cardiovascular risk assessment** and prevention planning. It is most often discussed in outpatient settings for people without known coronary artery disease.

A CT Coronary Angiogram is a computed tomography (CT) imaging test that visualizes the coronary arteries. It is a diagnostic test used to evaluate coronary artery disease and related coronary anatomy. It is commonly encountered in chest pain evaluation, preventive cardiology discussions, and pre-procedural planning. It uses X-rays, ECG (electrocardiogram) synchronization, and usually iodinated contrast to create detailed images.

Cardiac CT is a cardiovascular imaging test that uses computed tomography (CT) to create detailed pictures of the heart and nearby vessels. It is a diagnostic test, most often used to evaluate the coronary arteries and cardiac anatomy. Cardiac CT is commonly encountered when clinicians are assessing chest pain, suspected coronary artery disease (CAD), or structural heart questions. It is also used for procedural planning and follow-up in selected cardiology pathways.

Cardiac MRI is a noninvasive imaging test that uses magnetic fields and radiofrequency pulses to create detailed pictures of the heart. It is a diagnostic test (cardiovascular imaging modality) used to assess cardiac structure, function, blood flow, and tissue characteristics. It is commonly encountered when echocardiography or computed tomography (CT) does not fully answer a clinical question. It is used across cardiology, including cardiomyopathy evaluation, myocarditis workups, congenital heart disease follow-up, and ischemic heart disease assessment.

A Nuclear Stress Test is a cardiac imaging test that evaluates blood flow to the heart muscle during stress and at rest. It is a diagnostic test in the category of nuclear medicine and cardiology imaging. It is commonly encountered when assessing suspected or known coronary artery disease (CAD). It helps connect symptoms, physiology, and ischemia (reduced blood supply) in clinical decision-making.