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An electrocardiogram


  • 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:
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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)