However, there are some people who are overly sensitive to this response and the conduction through the heart tissue is dramatically slowed. In this case, the normal sinus impulses are unable to transverse the atrioventricular node and AV block develops. This signifies that certain sinus impulses are not being conducted to the ventricles. If the heart rate gets too slow, fainting spells may result. I hope you find this information useful.
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