MEDICINE
CARDIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The SA node is the dominant cardiac pacemaker in healthy patients.
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SA nodal ischemia occurs when the left coronary artery is occluded.
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The SA node is located in the superior aspect of the right ventricle.
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Impulses generated by the SA node travel through the right atrium only.
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Detailed explanation-1: -Which of the following statements is true about the SA (sinoatrial) node? The pacemaker cells, which establish the heart rate, are located in the SA node.
Detailed explanation-2: -The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract. The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump. The SA node is considered the pacemaker of the heart.
Detailed explanation-3: -The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.
Detailed explanation-4: -Answer and Explanation: The false statement is c. It sends impulses directly to the interventricular bundle of subendocardial branches (fibers).