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Understanding Inferior Wall MI ECG: A Quick Guide

inferior wall mi ecg

Author:- Mr. Ritesh Sharma

What is an Inferior Wall Myocardial Infarction?

An Inferior Wall MI occurs when there is an obstruction of blood flow in the coronary arteries supplying the inferior part of the heart, typically the right coronary artery (RCA) or its branches. This blockage leads to ischemia and necrosis of the myocardial tissue in the inferior wall of the heart. The inferior wall consists of the lower part of the left ventricle and part of the right ventricle. 

Inferior Wall MI ECG

An ECG is a primary diagnostic tool for identifying an MI. In the case of IWMI, specific changes in the ECG can indicate the presence and severity of the infarction. Here are the critical steps and markers to look for:

1. Lead Placement and Initial Inspection

An ECG records the electrical activity of the heart using multiple leads placed on the chest and limbs. For IWMI, the relevant leads are the inferior leads: II, III, and aVF.


2. ST-Segment Elevation

The hallmark of an acute MI, including IWMI, is ST-segment elevation. In IWMI:


3. Reciprocal Changes

Reciprocal changes are alterations in the ECG that occur in leads opposite to the infarcted area. For IWMI, reciprocal changes often appear as:


4. Pathological Q Waves

Q waves represent myocardial necrosis and can develop hours to days after the onset of an MI. In IWMI:


5. T-Wave Inversion

T-wave inversion is another sign of myocardial ischemia and infarction showcasing T-wave abnormalities. In the context of IWMI:


6. Other Considerations

Clinical Significance and Management

Symptoms

Risk Factors

Common risk factors for IWMI include:

  • Hypertension.
  • Hyperlipidemia.
  • Smoking.
  • Diabetes.
  • Family history of coronary artery disease.
  • Sedentary lifestyle.

Immediate Management

Monitoring and Follow-up

Long-term Management

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