Reflex responsible for tachycardia during right atrial distension is
Reflex resposible for tachycardia during right atrial distension is Bainbridge reflex. Atrial Reflex Control of hea rate: The Bainbridge Reflex The stretch recceptors of the atria that elicit the Bainbridge reflex transmit their afferent signals through the vagus nerve nerves to the medulla of the brain. Then efferent signals are transmitted back through vagal and sympathetic nerves to increase hea rate and strength of hea conntraction. Bezold-Jarisch Reflex: Activation of chemosensitive vagal C fibers in the cardiopulmonary region (eg,, Juxta capillary ragion of alveoli, ventricles, atria, great veins, and pulmonary aery) causes profound bradycardia, hypotension and a brief period of apnea followed by rapid shallow breathing. Cushing Reflex: When ICP is increased, the blood supply to RVLM neurons is compromised. The local hypoxia and hypercapnia causes an increase in discharge from the neurons, producing hypeension, bradycardia and irregular respiration. The resultant rise in systemic aerial pressure tends to restore the blood flow to the medulla. REF: Guyton and Hall 13th edition PGno: 223
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