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The slow heart rate may also lead to atrial, junctional, or ventricular ectopic rhythms. Bradycardia is not necessarily problematic. People who practice sports may have sinus bradycardia, because their trained hearts can pump enough blood in each contraction to allow a low resting heart rate .
The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness. [8] Chronotropic incompetence (CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation.
Commotio cordis (Latin, "agitation / disruption of the heart") is a rare disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region) at a critical instant during the cycle of a heartbeat. [1] The condition is 97% fatal if not treated within three minutes. [2]
Reverse use dependent drugs that slow heart rate (such as quinidine) can be less effective at high heart rates. [11] The refractoriness of the ventricular myocyte increases at lower heart rates . [ citation needed ] This increases the susceptibility of the myocardium to early Afterdepolarizations (EADs) at low heart rates.
The resting heart rate in children is much faster. In athletes, however, the resting heart rate can be as slow as 40 beats per minute, and be considered normal. [citation needed] The term sinus arrhythmia [26] refers to a normal phenomenon of alternating mild acceleration and slowing of the heart rate that occurs with breathing in and out ...
These maneuvers involves holding one's breath and bearing down—can be employed to stimulate the vagus nerve and slow the heart rate. [13] However, these techniques may provide only temporary relief, and if palpitations persist or are associated with other concerning symptoms, medical evaluation is essential to determine any underlying causes ...
It consists of a brief speed-up in heart rate, followed by a slow decrease back to the baseline rate. PVCs can occur naturally in most otherwise-healthy adults, so measuring the characteristics of a given person's HRT can offer a non-invasive way to evaluate certain aspects of their cardiac or autonomic function without applying artificial ...
Heart rate is dependent on the movement of an electrical stimulus through the individual heart cells. This is mediated by the opening of ion channels on cell surfaces. HBI-3000 exerts its effects on the heart by inhibiting multiple ion channels (INa-F, INa-L, ICa-L and IKr), but predominantly the INa-L ion channel.