Match the Column - I with Column - II: Column - I Column II a P - wave i Depolarisation of ventricles b QRS…

Match the Column - I with Column - II:
  Column - I   Column II
a P - wave i Depolarisation of ventricles
b QRS complex ii Repolarisation of ventricles
c T - wave iii Coronary ischemia
d Reduction in the size of T - wave iv  Depolarisation of atria
    v Repolarisation of atria


Select the correct option
  1. a-iv; b-i; c-ii; d-iii
  2. a-iv; b-i; c-ii; d-v
  3. a-ii; b-i; c-v; d-iii
  4. a-ii; b-iii; c-v; d-iv

Solution

The first deflection is the P wave linked with right and left atrial depolarization. A wave of which is invisible because of low amplitude.
The normal P wave is no higher than 2.5 mm (two-and-a half1-mm-divisions) tall and less than 120 ms (three 1-mm-divisions) in width in any lead.
The second wave is the QRS complex. The complex has a series of 3 deflections that reflects current associated with right and left ventricular depolarization. By convention, the first deflection in the complex, if negative, is called a Q wave. The first positive deflection in the complex is called an R wave. A negative deflection after an R wave is called an S wave. The most labile wave in the ECG is the T wave, which changes including low-amplitude T waves and abnormally inverted T waves, which may be the result of many cardiac and non-cardiac conditions.

Asked in: NEET 2019 (All India)

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