Evidence-Based Medical Encyclopedia
Explore thousands of diseases with authoritative clinical information from WHO, CDC, NIH, and international medical guidelines. Every condition features an interactive journey from diagnosis to treatment.
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Cardiology
Non-ST-Segment Elevation Myocardial Infarction
A 'mild' heart attack where a heart artery is partially blocked, causing heart muscle damage without the classic ECG changes seen in fully blocked arteries.
Essential Hypertension
Chronic high blood pressure with no single clear cause, significantly increasing the risk of heart attacks and strokes.
Acute Coronary Syndrome
Acute Coronary Syndrome is a heart attack or severe angina caused by a sudden blockage in a coronary artery, cutting off blood and oxygen to the heart muscle.
Heart Failure with Preserved Ejection Fraction
A type of heart failure where the heart pumps normally but is too stiff to relax and fill properly with blood, causing fluid backup into the lungs and body.
Heart Failure with Reduced Ejection Fraction
A condition where the heart muscle is weak and dilated, failing to pump enough blood to the body, characterized by an ejection fraction of 40% or lower.
Atrial Fibrillation
A chaotic, irregular heartbeat that causes poor blood flow and massively increases the risk of forming blood clots in the heart, leading to stroke.
Acute Pericarditis
Acute pericarditis is an inflammation of the sac surrounding the heart, causing sharp chest pain that gets worse with deep breathing but feels better when sitting up and leaning forward.
Congestive Heart Failure
A chronic, progressive condition where the heart cannot pump efficiently, causing fluid to back up into the lungs and body.
Chagas Disease
A parasitic infection transmitted by 'kissing bugs' in the Americas, which can lie dormant for decades before causing heart failure and enlarged digestive organs.
Infective Endocarditis
A serious bacterial infection of the heart valves that can destroy the valve and spread infected clots throughout the body.
Aortic Stenosis
A mechanical narrowing of the heart's aortic valve that restricts blood flow, causing severe chest pain, fainting, and heart failure. It requires surgical or transcatheter valve replacement once symptoms develop.
Mitral Regurgitation
A valvular disorder where the mitral valve fails to close completely, allowing blood to flow backward into the left atrium during ventricular contraction.