GENERAL ANATOMY
ANATOMY OF THE HEART
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The action potential arises within the SA node
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The QRS complex and the T wave are ventricular electrical events
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The origin of action potential is described as ectopic
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Each P wave us followed by QRS complex
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Detailed explanation-1: -Sinus rhythm is characterized by a P wave that precedes every QRS, a QRS that follows every P wave, and an upright P wave in leads I and aVF (see Fig. 16.17).
Detailed explanation-2: -Sinus arrhythmia is a variation of normal sinus rhythm that characteristically presents with an irregular rate in which the change in the R-R interval is greater than 0.12 seconds. Additionally, the P waves are typically monoform and in a pattern consistent with atrial activation originating from the sinus node.
Detailed explanation-3: -The rhythm of the heart is normally determined by a pacemaker site called the sinoatrial (SA) node located in the posterior wall of the right atrium near the superior vena cava.
Detailed explanation-4: -Wandering Atrial Pacemaker. Wandering atrial pacemaker is produced by the competing activity of three or more atrial pacemakers, one of which is usually the sinus node. It is an irregular rhythm characterized by variable P-wave morphology and PR intervals.