![]() But, each impulse does get through and the resting heart rate is normal. First-degree heart block means there is a slight delay in each impulse going from the atria to the ventricles.The SA node in the right atrium 'fires' at the normal rate but the rate at which the ventricles contract (pulse rate) depends on how many impulses get through to the ventricles: Heart block occurs when the electrical impulses are partially or fully blocked between the atria and the ventricles. ![]() It is fatal unless corrected within a few minutes. This is life-threatening and a common cause of the heart stopping (cardiac arrest). This means the heart muscles only weakly contract and this is not enough to push blood out of the heart.
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