A person whose heart rate does not reach the expected level for age and gender at maximum exertion is said to have chronotropic incompetence.
predicted maximum heart rate =
= 220- (age in years)
Chronotropic incompetence may be defined as:
(1) failure to reach 85% of the predicted maximum heart rate
(2) failure to reach the 95% confidence limit (mean minus 2 SD) for age and gender
percent heart rate impairment =
= ((predicted value) - (maximum heart rate achieved)) / (predicted value) * 100%
Causes of chronotropic impairment:
(1) beta-blocker therapy
(2) elite aerobic athlete
(3) poor left ventricular function and severe coronary artery disease
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Specialty: Surgery, orthopedic, Cardiology
ICD-10: ,
