What happens if the sinoatrial node fails?

Answer 1

If the AV node could no longer do its job, I think that the ventricles would not be able to contract. The blood could not move to the lungs, nor could it move back. If the AV node could no longer do its job, it would be equivalent to only the top half of the heart working. If only the top half of the heart is working, which means blood is coming from the body into the right atrium, and then the atrium pumps blood into the right ventricle. The ventricle would be swollen because it could not hold so much deoxygenated blood, and eventually, burst. This is because, if the ventricle could not contract, that means there is no way that the ventricle can empty itself out. If the AV node could no longer do its job, then the only part of the heart that would contain blood in it would be the right ventricle, until there is no longer any blood in the body. All of the body's blood would be deoxygenated and in the right ventricle because deoxygenated blood is coming back from the body to the right atrium, and the atrium is contracting, allowing blood into the right ventricle, but no oxygenated blood is leaving the heart, eventually putting all of the blood from the body into the right ventricle. This would eventually lead to death.

Answer 2

When the sinoatrial node, the pacemaker of the heart, fails, the atrioventricular node takes over as pacemaker. It is located between the atria and ventricles in the heart. It paces the heart at about 60 beats per minute.

Answer 3

if the sa node becomes non functional the av node will take over