Assertion : The enlarged Q and R waves indicate myocardial infarction
Reason : Any deviation in the normal recording of ECG indicates possible abnormality or disease.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

B

Explanation

A normal electrocardiogram (ECG) is composed of P wave, a QRS wave (complex) and a T wave. The ECGs obtained from different individuals have roughly the same shape and any deviation from this shape indicates a possible abnormality or disease. For example, the enlarged Q and R wave indicate a myocardial infraction (heart attack), enlargement of the P wave indicates enlargement of the atria. T wave is flat when the heart muscles receive insufficient oxygen as in atherosclerotic heart disease.