To Query for Null Values,use Is Null as the Criterion

question 24

True/False

To query for null values,use Is Null as the criterion.

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Definitions:

Q-T Interval

The period on an electrocardiogram (ECG) that represents the time between the start of the Q wave and the end of the T wave, reflecting the time it takes for the ventricles to depolarize and repolarize.

AV Node

The atrioventricular node, a part of the electrical conduction system of the heart that delays the signal before it passes to the ventricles.

SA Node

The sinoatrial node, often referred to as the SA Node, is the natural pacemaker of the heart, responsible for initiating the heart's electrical impulses that regulate heartbeats.

Ectopic Focus

This term denotes an abnormal cluster of cardiac cells that generates heartbeats at an irregular rate or rhythm, different from the heart's primary pacemaker.