Year: 2026

Endocarditis is inflammation of the inner lining of the heart, most often involving a heart valve. It is a medical condition (typically an infectious disease with cardiovascular consequences). It is commonly encountered in cardiology when evaluating fever with a new murmur, embolic events, or unexplained heart failure. It is also relevant in patients with prosthetic valves, intracardiac devices, or certain congenital heart conditions.

Myocarditis is inflammation of the myocardium, the heart’s muscular middle layer. It is a medical condition (a disease process), not a symptom or a test. It is commonly encountered in cardiology when evaluating chest pain, heart failure, arrhythmias, or unexplained troponin elevation. It spans a spectrum from mild, self-limited illness to life-threatening cardiac dysfunction.

Pericarditis is inflammation of the pericardium, the thin sac that surrounds the heart. It is a medical condition, not a test or a symptom, although it often presents with chest pain. It is commonly encountered in emergency care, inpatient cardiology, and outpatient follow-up. It overlaps with other cardiovascular syndromes because it can mimic myocardial infarction (heart attack) and can be complicated by pericardial effusion or tamponade.

Gallop Rhythm is an extra heart sound that creates a “three-beat” cadence during the cardiac cycle. It is a **physical exam finding (auscultatory sign)** rather than a disease by itself. It is most commonly encountered when listening to the heart in patients with suspected **heart failure** or other conditions that affect ventricular filling. Clinicians often describe it as an **S3 gallop**, **S4 gallop**, or sometimes a **summation gallop**.

S4 is the “fourth heart sound,” sometimes called an atrial gallop. It is a **physical exam finding** heard during cardiac auscultation. S4 is most commonly encountered when evaluating patients with suspected **diastolic dysfunction** or a **stiff (noncompliant) ventricle**. It is discussed frequently in bedside cardiology teaching because it links heart sounds to ventricular filling physiology.

S3 is the “third heart sound,” an extra low-frequency sound heard during diastole. It is a physical exam finding (a cardiac auscultation sign), sometimes called a “ventricular gallop.” S3 is commonly encountered when evaluating suspected heart failure or volume overload. It can also be a normal variant in some younger people and high-flow states.

S2 is the **second heart sound** heard during cardiac auscultation. It is a **physical exam finding (a heart sound/sign)** produced by **valve closure**. S2 is commonly assessed at the bedside to support **hemodynamic and valvular** reasoning. It is frequently discussed in cardiology when interpreting **splitting patterns** and **pulmonary or systemic pressures**.

S1 is the first heart sound heard during cardiac auscultation. It is a physical exam finding (a normal heart sound) generated at the start of ventricular systole. S1 is commonly assessed with a stethoscope during bedside cardiovascular examination. Clinicians use S1 to help time murmurs and to infer basic valve and ventricular dynamics.

Heart Sounds are the noises generated by the beating heart and nearby blood flow. They are a **physical exam sign** assessed by **cardiac auscultation** with a stethoscope. They are commonly encountered in routine checkups, emergency assessments, and inpatient cardiology rounds. They help clinicians connect bedside findings to valve function, ventricular filling, and hemodynamics.

A Cardiac Murmur is an extra heart sound caused by turbulent blood flow. It is a **physical exam finding (clinical sign)**, not a diagnosis by itself. It is commonly detected during **cardiac auscultation** with a stethoscope in clinics, emergency settings, and pre-participation or preoperative exams. Its significance ranges from a normal variant to a clue for structural heart disease.