ECG: Electrocardiography

ECG (Electrocardiography) is a medical test that records the electrical activity of the heart over a period of time. The ECG measures the electrical impulses that trigger heartbeats, helping healthcare professionals assess the heart's rhythm, structure, and electrical function.

Key Components of an ECG:

1. P Wave: Represents atrial depolarization (the electrical activity that leads to atrial contraction).
2. QRS Complex: Represents ventricular depolarization (the electrical activity leading to ventricular contraction).
3. T Wave: Represents ventricular repolarization (the recovery phase after the contraction).
4. PR Interval: The time it takes for the electrical signal to travel from the atria to the ventricles.
5. ST Segment: Reflects the time between the end of ventricular depolarization and the start of repolarization.

Uses of ECG:

• Diagnosing Heart Conditions: ECGs are used to detect arrhythmias, heart attacks, and other cardiovascular issues such as heart enlargement or ischemia (reduced blood flow to the heart).
• Monitoring Heart Health: ECGs help monitor patients with known heart conditions, ensuring the treatment is working and detecting any changes in heart function.
• Pre-Surgical Evaluations: A baseline ECG is often taken before surgery to ensure there are no underlying heart issues.

Types of ECG:

1. Resting ECG: The patient is asked to lie down while the ECG is taken, typically in a hospital or doctor's office.
2. Holter Monitor: A portable ECG device worn by the patient for 24-48 hours to monitor heart activity over a period of time.
3. Stress ECG: Performed during exercise (e.g., on a treadmill) to assess how the heart functions under physical stress.