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The heart beats approximately 100,000 times per day, pumping about 7,500 liters of blood.
A standard ECG uses 12 leads to capture electrical activity from different angles of the heart.
Werner Forssmann performed the first human cardiac catheterization on himself in 1929.
Normal blood pressure is defined as below 120/80 mmHg per current guidelines.
At least 150 minutes of moderate exercise weekly is associated with lower cardiovascular risk.
Limiting sodium intake to under 2,300mg per day supports healthy blood pressure.
An adult heart weighs roughly 300 grams — about the size of a clenched fist.
A normal QT interval typically falls between 0.36–0.44s corrected for heart rate.
The first implantable pacemaker was placed in a human patient in 1958.
Up to 80% of premature heart disease and stroke cases are preventable through lifestyle changes.
About 1 in 4 adults will develop atrial fibrillation in their lifetime.
Beta-blockers, now a cornerstone of cardiac therapy, were first developed in the 1950s and 60s.
More than 6.2 million adults in the United States live with heart failure — and the number is rising globally.
The heart's electrical system relies on three main pacemaker sites: the SA node, AV node, and Purkinje fibers.
Guidelines recommend restoring blood flow within 90 minutes of first medical contact for STEMI patients undergoing primary PCI.