Chronotropic

Chronotropic

Chronotropic refers to the ability to affect the periodicity of a recurring action, such as the slowing or speeding up of the heartbeat due to extrinsic control of the SA node. It plays an essential role in cardiovascular adaptations during incremental exercise, where the heart rate can increase significantly from resting values.From: Tissue Engineering [2019], Normative values for heart rate response to exercise in young athletes at 10–18 years old [2023]

Cardiac dysrhythmia management in the radiology department

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Purchase Book

Published in William H. Bush, Karl N. Krecke, Bernard F. King, Michael A. Bettmann, Radiology Life Support (Rad-LS), 2017

Geoffrey S. Ferguson

For block at the AV node with a ventricular rate that is too slow to maintain adequate cardiac output, atropine is the drug of choice, with temporary pacemaker insertion if atropine fails. For infranodal block a pacemaker is indicated. The patient’s condition may require isoproterenol for chronotropic support prior to pacing.

Normative values for heart rate response to exercise in young athletes at 10–18 years old

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Journal Information

Published in European Journal of Sport Science, 2023

Gabriele Mascherini, Giorgio Galanti, Laura Stefani, Pascal Izzicupo

During physical activity, interactions between different physiological systems are required. The cardiovascular system is continuously stressed during dynamic and progressive physical activity to favor increased oxygen transport to the muscular system. Oxygen consumption enlarges due to increases cardiac output (heart rate × systolic output) and arteriovenous oxygen difference, as muscles require more oxygen to sustain muscular contractions. Therefore, the chronotropic response to incremental exercise plays an essential role in cardiovascular adaptations: at maximum exercise intensity, HR can increase 2.5–3 times the values at rest (Bar-Or, 1983; Pieles & Stuart, 2020).

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Cardiac dysrhythmia management in the radiology department

Normative values for heart rate response to exercise in young athletes at 10–18 years old