Orthopnea is shortness of breath that occurs when lying flat and improves with sitting up. It is a clinical symptom used primarily in cardiology and respiratory medicine. Orthopnea is most often discussed in the context of heart failure and pulmonary congestion. It is commonly elicited during history-taking and helps guide risk assessment and diagnostic testing.

Pleural Effusion is the abnormal collection of fluid in the pleural space between the lung and the chest wall. It is a clinical finding that reflects underlying physiology or disease rather than a single diagnosis. It is most commonly discussed in internal medicine, pulmonology, and cardiology because heart and lung disorders frequently coexist. It is identified through history, physical examination, and imaging, and it may prompt diagnostic sampling or drainage.

Pulmonary Edema is the abnormal accumulation of fluid in the lungs’ interstitium and/or alveoli. It is a clinical syndrome discussed in cardiology, emergency medicine, critical care, and internal medicine. It most often reflects elevated left-sided cardiac filling pressures, but it can also occur from non-cardiac lung injury. It is commonly identified during evaluation of acute dyspnea, hypoxemia, and suspected acute heart failure.

Right Heart Failure is a clinical syndrome in which the right ventricle cannot pump blood forward effectively into the pulmonary circulation. It is discussed in cardiovascular anatomy and physiology, acute care, and chronic heart failure management. It commonly appears in contexts such as pulmonary hypertension, pulmonary embolism, and advanced left-sided heart failure. Clinicians use it to guide diagnosis, hemodynamic assessment, and risk stratification.

Left Ventricular Dysfunction is impaired performance of the left ventricle, the heart’s main pumping chamber. It is a physiology and disease concept used across cardiology, emergency care, and perioperative medicine. It commonly refers to reduced contractility (systolic dysfunction) and/or abnormal filling (diastolic dysfunction). It is most often identified and followed using echocardiography and clinical heart failure assessment.

Cardiac Remodeling describes changes in heart size, shape, structure, and function over time. It is a core concept in cardiovascular anatomy, physiology, and disease progression. It is commonly discussed in heart failure, myocardial infarction, hypertension, and cardiomyopathy. It is assessed using imaging, hemodynamics, and clinical follow-up.

Cardiac Cachexia is a clinical syndrome of involuntary weight loss and muscle wasting that occurs in chronic heart disease, most often advanced heart failure. It is a pathology and systemic metabolic complication rather than a single organ lesion. The term is commonly used in cardiology clinics, inpatient heart failure services, and multidisciplinary rehabilitation and nutrition settings.

Prosthetic Valve Endocarditis is an infection of an implanted heart valve or valve repair material. It is a form of infective endocarditis (infection of the endocardial surface of the heart). It sits at the intersection of cardiology, infectious diseases, and cardiothoracic surgery. It is most commonly discussed when evaluating fever, bacteremia, stroke, or new prosthetic valve dysfunction.

Infective Endocarditis is an infection of the endocardial surface of the heart, most often involving a heart valve. It is a cardiovascular disease entity that sits at the intersection of cardiology, infectious diseases, and cardiac surgery. It is commonly discussed in the context of fever with a new murmur, bacteremia, embolic events, or prosthetic valve complications. It is typically evaluated using blood cultures and echocardiography.

Chagas Disease is an infectious parasitic disease caused by *Trypanosoma cruzi* (often abbreviated *T. cruzi*). It is clinically relevant in cardiology because it can lead to myocarditis and chronic cardiomyopathy. It is most often discussed in global health, infectious diseases, and heart failure/arrhythmia practice. It is commonly recognized in people with exposure in endemic areas and is increasingly encountered in non-endemic settings.