CLINICAL MEDICINE

Detailed explanation-1: -Tachycardia occurs when the heart beats more than 100 times per minute, whether at rest or with exercise. People develop sinus tachycardia when the sinus node in the heart sends electrical impulses more quickly than normal. It can occur as a result of a particular trigger, such as exercise, caffeine, or stress.

Detailed explanation-2: -The SA node, also known as the sinus node, represents a crescent-like shaped cluster of myocytes divided by connective tissue, spreading over a few square millimeters. It is located at the junction of the crista terminalis in the upper wall of the right atrium and the opening of the superior vena cava.

Detailed explanation-3: -The SA node fires at a normal rate of 60–100 beats per minute (bpm), and causes depolarization in atrial muscle tissue and subsequent atrial contraction.

Detailed explanation-4: -What is sinus tachycardia? Sinus tachycardia refers to a faster-than-typical heart rhythm. Your heart has a natural pacemaker called the sinus node, which generates electrical impulses that move through your heart muscle and cause it to contract, or beat.