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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 .
Emergency treatment is not needed if the person is asymptomatic or minimally symptomatic. [34] Treatment of chronic symptomatic bradycardia first necessitates correlation of symptoms. [5] Once symptoms have been clearly linked to bradycardia, permanent cardiac pacing can be provided to increase heart rate and symptoms will improve. [5]
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 ...
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]
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.
Mephentermine, sold under the brand name Wyamine among others, is a sympathomimetic medication which was previously used in the treatment of low blood pressure but is mostly no longer marketed. [6] [5] [4] [7] [8] It is used by injection into a vein or muscle, by inhalation, and by mouth. [4] [5]
Both arrhythmias have at least 3 different P-wave morphologies in a single ECG lead, but the heart rate is different. When the heart rate is lower than 100 beats per minute, the heart rhythm is considered wandering atrial pacemaker. When the heart rate is greater than 100 beats per minute, the heart rhythm is considered multifocal atrial ...