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Bradycardia, also called bradyarrhythmia, is a resting heart rate under 60 beats per minute (BPM). [1] While bradycardia can result from various pathologic processes, it is commonly a physiologic response to cardiovascular conditioning or due to asymptomatic type 1 atrioventricular block.
[medical citation needed] Sinus bradycardia can also be an adaptive advantage; for example, diving seals may have a heart rate as low as 12 beats per minute, helping them to conserve oxygen during long dives. [4] Sinus bradycardia is a common condition found in both healthy individuals and those who are considered well-conditioned athletes. [5]
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When this happens, the heart's atrioventricular node or bundle of His can take over as the pacemaker, starting the electrical signal that causes the heart to beat. [ 1 ] [ 5 ] Depending on where the rhythm originates in the AV node, the atria can contract before ventricular contraction due to retrograde conduction , during ventricular ...
The efferent portion is carried by the vagus nerve from the cardiovascular center of the medulla to the heart, of which increased stimulation leads to decreased output of the sinoatrial node. [3] This reflex is especially sensitive in neonates and children, particularly during strabismus correction surgery . [ 4 ]
Heart tissue infection also known as myocarditis -Complication of heart surgery; Hypothyroidism or an underactive thyroid gland [1] Imbalance of electrolytes which are mineral related substances needed for conducting electrical impulses; Obstructive sleep apnea which is the repeated disruption of breathing during sleep due to obstruction to the ...
Polysomnography (PSG) is a multi-parameter type of sleep study [1] and a diagnostic tool in sleep medicine.The test result is called a polysomnogram, also abbreviated PSG.The name is derived from Greek and Latin roots: the Greek πολύς (polus for "many, much", indicating many channels), the Latin somnus ("sleep"), and the Greek γράφειν (graphein, "to write").
A hallmark of sleep disordered breathing is the occurrence of arousals during sleep. Such arousals elicit generalized autonomic activation, which among other physiological changes, includes sympathetic nervous system-mediated peripheral vasoconstriction, and transient pulse rate elevation. The PAT technology allows measurement of these changes ...