The following diseases do not occur with an increased pulse rate: First, severe sinus node hypofunction, the sinus node is hypofunctional due to a variety of reasons, the main manifestation is a slow heartbeat, there will not be an increased pulse rate. Second, third degree AV block, third degree AV block, the function of the sinus node may be normal, due to the existence of atrioventricular block, the impulse of the sinus node can not cause the beating of the ventricle, the ventricle can only follow its own slower frequency in the beating, the patient will not appear the increase in heartbeat and pulse. Third, patients with hypothyroidism, patients with abnormal thyroid function, resulting in insufficient secretion of thyroid hormones, easily cause a slow heartbeat, this patient’s pulse is also slow.