Question
From the following options, in which condition,the pecularity as marked by an arrow in ECG ,is not seen?
A. Myocardial Infarction.
B. Hypokalemia.
C. Prinzmetal’s Angina.
D. Acute Pericarditis.
Show Answer
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Correct Answer » B
Explanation
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Ans: B. Hypokalemia
ECG in the image points towards ST segment Elevation.
ST segment
- The ST segment is the flat, isoelectric section of the ECG between the end of the S wave (the J point) and the beginning of the T wave.
- It represents the interval between ventricular depolarization and repolarization.
ST elevation
- It is significant when it is greater than 1 mm (1 small square) in 2 or more contiguous limb leads or >2mm in 2 or more chest leads.
Causes:
It can be associated with:
Myocardial infarction :
- ST elevation in select leads is more common with MI. ST elevation only occurs in full thickness infarction.
- These elevations must be present in anatomically contiguous leads. (I, aVL, V5, V6 correspond to the lateral wall; V3-V4 correspond to the anterior wall ; V1-V2 correspond to the septal wall; II, III, aVF correspond to the inferior wall.)
- There is usually reciprocal ST depression in the electrically opposite leads.
Prinzmetal’s angina
Acute pericarditis:
- ST elevation in all leads is more common with acute pericarditis.
- Left ventricular aneurysm
- Blunt trauma to the chest resulting in a cardiac contusion
- Hyperkalemia
- Acute myocarditis
- Pulmonary embolism
- Brugada syndrome
- Hypothermia
