| HR | heart rate; hemorrhagic retinopathy; high resolution; higher rate; histamine receptor; hormonal resp... |
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| HRA | health record analyst; health risk appraisal; heart rate audiometry; hereditary renal adysplasia; hi... |
| HRF | heart rate fluctuations |
| HRR | head rotation to the right; heart rate range |
| HRRI | heart rate retardation index |
| heart dilatation |
Abnormal increase in the size of the cavities of the heart, a common result of valvular disease or hypertension.
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| heart pump, nuclear-powered |
An artificial heart powered by nuclear energy.
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| heart rate variability |
ABBR: HRV. Spontaneous fluctuations above and below the mean heart rate. A reduced HRV is associated with an increased incidence of total mortality and cardiac events in post-myocardial infarction patients, as well as in
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| heart rate, target zone |
A heart rate that is 50% to 75% of an individual's maximum heart rate. Persons who exercise to attain or maintain physical fitness should attempt to exercise vigorously enough to produce a heart rate that is both safe and
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| heart reflex |
Any reflex in which the stimulation of a sensory nerve causes the heart rate to increase or decrease. An example is the Bainbridge reflex, in which stimulation of sensory receptors in the right atrium by increased venous return resu
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