दिल को समझना ईसीजी का रहस्य [Electrocardiogram (ECG): Complete Guide]

# Electrocardiogram (ECG): Complete Guide

An **Electrocardiogram (ECG or EKG)** is a simple, painless, and non-invasive test that records the electrical activity of the heart. Every heartbeat is triggered by electrical impulses that travel through the heart muscle. An ECG captures these signals and displays them as waves on graph paper or a monitor, helping doctors evaluate heart health.

## Who Should Go for an ECG?

An ECG is recommended for people experiencing symptoms that may indicate heart problems, including:

* Chest pain or discomfort
* Palpitations (feeling of skipped or rapid heartbeats)
* Shortness of breath
* Dizziness or fainting
* Unexplained fatigue
* High blood pressure
* Suspected heart attack
* Family history of heart disease
* Irregular heartbeat (arrhythmia)
* Before major surgery or during routine cardiac checkups

### Example

A 55-year-old man with chest pain and sweating may undergo an ECG to check for signs of a heart attack.

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# Precautions Before an ECG

Although no special preparation is usually required, the following precautions help ensure accurate results:

1. Wear loose, comfortable clothing.
2. Avoid applying lotions, oils, or creams on the chest before the test.
3. Inform the healthcare provider about any medications you take.
4. Avoid strenuous exercise immediately before the test unless instructed.
5. Stay relaxed and lie still during recording to prevent interference.

The test usually takes only 5–10 minutes.

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# Understanding ECG Waves and Parameters

A normal ECG tracing consists of several waves, intervals, and segments.

## 1. P Wave

* Represents electrical activation (depolarization) of the atria.
* Indicates that the upper chambers of the heart are contracting.

### Normal Value

* Duration: Less than 0.12 seconds

### Abnormal Findings

* Tall P wave: Right atrial enlargement
* Broad P wave: Left atrial enlargement

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## 2. PR Interval

* Time taken for the electrical impulse to travel from the atria to the ventricles.

### Normal Value

* 0.12–0.20 seconds

### Abnormal Findings

* Prolonged PR interval: First-degree heart block
* Short PR interval: Conditions such as pre-excitation syndromes

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## 3. QRS Complex

Represents ventricular depolarization (contraction of the lower heart chambers).

### Normal Value

* Less than 0.12 seconds

### Abnormal Findings

* Wide QRS: Bundle branch block or ventricular rhythm
* Very tall QRS: Ventricular hypertrophy

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## 4. ST Segment

* Period between ventricular depolarization and repolarization.

### Normal Finding

* Usually flat (isoelectric)

### Abnormal Findings

* ST elevation: Possible acute heart attack
* ST depression: Reduced blood supply to the heart muscle (ischemia)

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## 5. T Wave

* Represents ventricular repolarization (recovery phase).

### Abnormal Findings

* Inverted T wave: Ischemia or other heart disorders
* Tall peaked T wave: High blood potassium levels

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## 6. QT Interval

* Measures total time for ventricular contraction and recovery.

### Normal Value

* Generally less than 440 milliseconds in men and less than 460 milliseconds in women

### Abnormal Findings

* Prolonged QT interval: Increased risk of dangerous arrhythmias
* Short QT interval: Less common but may indicate electrolyte disorders

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# Heart Rate Calculation

Normal resting heart rate:

* Adults: 60–100 beats per minute

### Findings

* Above 100 bpm: Tachycardia
* Below 60 bpm: Bradycardia (may be normal in athletes)

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# ECG Indicators and What They Mean

| ECG Finding | Possible Meaning |
| ---------------- | ------------------------------------------- |
| ST Elevation | Heart attack |
| ST Depression | Ischemia |
| Irregular Rhythm | Arrhythmia |
| Absent P Waves | Atrial fibrillation |
| Wide QRS | Ventricular conduction defect |
| Peaked T Waves | High potassium |
| Low Voltage ECG | Obesity, fluid around heart, hypothyroidism |

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# Common Conditions Diagnosed by ECG

* Heart attack (Myocardial Infarction)
* Arrhythmias
* Atrial fibrillation
* Heart blocks
* Electrolyte imbalances
* Enlarged heart chambers
* Coronary artery disease
* Pericarditis (inflammation around the heart)

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# Case Example

A 60-year-old patient arrives with severe chest pain, sweating, and nausea. ECG shows **ST-segment elevation** in multiple leads. This finding strongly suggests an acute heart attack, requiring immediate medical treatment to restore blood flow to the heart.

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# Conclusion

An ECG is one of the most important and widely used cardiac investigations. It is quick, safe, inexpensive, and provides valuable information about heart rhythm, heart rate, blood supply to the heart muscle, and electrical conduction pathways. People with chest pain, palpitations, breathless

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