Question

In normal ECG, PR and T wave are lies at
(A) Above the baseline
(B) Below the baseline
(C) Partly above and below the baseline
(D) Equal to the base line

Answer 1

Hint:ECG stands for electrocardiogram. It is the instrument used to measure the electrical vibrations of the heart. This ECG records the change in the electric impulse. The electric impulse from the heart reaches all the body parts like skin of the hand, chest region etc.

Complete answer:
The ECG graph is plotted from the obtained electrical impulse on the different parts of the body. Then the obtained ECG graph is made to compare with the standard ECG graph to know that the heart is working regularly. This also finds any abnormalities and the disease in the heart. In the basic and the standard ECG graph, the points P, R, T waves always lie above the base line and the Q waves lie below the baseline.
 (1) P wave:-It is the upright smooth wave which lasts for less than or equal to 0.11 seconds.
(2) QRS complex:-The duration of this wave is 0.12 seconds. The small septal Q and the positive deflection R and the negative deflection S.
(3) T wave:-This wave deflects in the same way as the QRS complex. It is isolated and asymptomatic in nature.

Thus, the option (A) is the correct answer .

Note:ECG helps in finding the correct functioning of the heart. This ECG helps in the indication of the chest pain, myocardial infarction which is otherwise called as heart attack and cardiac stress testing, electrolyte abnormalities etc.