Electrocardiogram (ECG or EKG)
An Electrocardiogram (ECG) is a non-invasive diagnostic test that records the electrical activity of the heart over a period of time using electrodes placed on the body. It is a vital tool used to detect heart abnormalities, monitor cardiac health, and guide treatment decisions.
An ECG:
- Detects and records electrical signals generated by the heart muscle during each heartbeat
- Produces a graph (tracing) of voltage versus time, displaying heart rhythm and electrical conduction
- Helps identify arrhythmias, heart attacks, heart enlargement, electrolyte imbalances, and more
📊 How It Works
- Electrodes (typically 10) are placed on the chest, arms, and legs
- These detect electrical impulses from the heart
- The impulses are transmitted to an ECG machine that plots waveforms such as:
- P wave (atrial depolarization)
- QRS complex (ventricular depolarization)
- T wave (ventricular repolarization)
📋 Types of ECG Tests
| Type | Description |
|---|---|
| Resting ECG | Performed while lying still; standard 12-lead ECG |
| Stress ECG | Monitors heart activity during exercise (e.g., treadmill) |
| Holter Monitor | Portable ECG worn for 24–48 hours |
| Event Monitor | Portable ECG activated during symptoms over days/weeks |
🏥 Uses of ECG in Medicine
- Diagnose arrhythmias (irregular heart rhythms)
- Detect heart attacks (myocardial infarctions)
- Monitor effects of cardiac medications
- Screen for heart enlargement or damage
- Evaluate symptoms like chest pain, shortness of breath, or fainting
- Pre-operative assessments or routine health checkups
🧪 Advantages
- Fast and painless
- Non-invasive
- Provides real-time information on heart function
⚠️ Limitations
- A normal ECG does not always rule out heart problems
- May require follow-up tests (e.g., echocardiogram, stress test)
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