How Do You Spell ABRAMS HEART REFLEX?

1. Abrams heart reflex refers to a physiological response of the human body characterized by a paradoxical bradycardia (slowing of the heart rate) in response to carotid sinus stimulation. It is named after J. T. Abrams, the scientist who first described this reflex in 1921.

   The carotid sinus is a specialized structure located in the walls of the carotid arteries, which are major blood vessels that supply oxygenated blood to the brain. It plays a crucial role in regulating blood pressure and heart rate. Ordinarily, stimulation of the carotid sinus elicits a reflexive increase in heart rate, known as the baroreceptor reflex, which helps maintain blood pressure within the normal range.

   However, in some cases, particularly in individuals suffering from certain cardiovascular diseases or disorders, stimulation of the carotid sinus can paradoxically lead to a decrease in heart rate, resulting in bradycardia. This response is known as the Abrams heart reflex.

   The mechanisms underlying the Abrams heart reflex are not fully understood. It is believed that the sensitivity of the carotid sinus baroreceptors is increased in these individuals, leading to an exaggerated response. The exact clinical significance of this reflex remains a topic of ongoing research and discussion.

   In summary, the Abrams heart reflex is a physiological response characterized by a paradoxical bradycardia following carotid sinus stimulation. It occurs in certain individuals with cardiovascular conditions and involves the exaggerated sensitivity of carotid sinus baroreceptors.

2. A contraction of the myocardium when the skin of the precordial region is irritated.

   A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.

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