Question

Match the Column - I with Column - II:

	Column - I		Column II
$\left(a\right)$	P - wave	$\left(i\right)$	Depolarisation of ventricles
$\left(b\right)$	QRS complex	$\left(i i\right)$	Repolarisation of ventricles
$\left(c\right)$	T - wave	$\left(i i i\right)$	Coronary ischemia
$\left(d\right)$	Reduction in the size of T - wave	$\left(i v\right) \, $	Depolarisation of atria
$ \, $		$\left(v\right)$	Repolarisation of atria

Select the correct option

• A. $a-\left(i v\right); \, b-\left(i\right); \, c-\left(i i\right); \, d-\left(i i i\right)$
• B. $a-\left(i v\right); \, b-\left(i\right); \, c-\left(i i\right); \, d-\left(v\right)$
• C. $a-\left(i i\right); \, b-\left(i\right); \, c-\left(v\right); \, d-\left(i i i\right)$
• D. $a-\left(i i\right); \, b-\left(i i i\right); \, c-\left(v\right); \, d-\left(i v\right)$

Answer 1

Answer: (A)

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.