When was the first practical electrocardiogram (ECG or EKG) invented?

The first practical electrocardiogram (ECG or EKG) was invented in 1895 by Willem Einthoven, a Dutch physiologist. This development marked a groundbreaking advancement in the field of cardiology, allowing for the electrical activity of the heart to be recorded and interpreted. Einthoven's work laid the foundation for modern ECG technology and its widespread use in diagnosing and monitoring heart conditions.

The year 1895 is significant because it was around this time that Einthoven developed the string galvanometer, which was the key instrument that allowed for the recording of electrical signals from the heart with sufficient sensitivity and accuracy. As a result, this invention was pivotal in transforming how physicians could assess cardiac health, ultimately improving patient care and outcomes in cardiology.