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In hematology, effective circulating volume (ECV) is the volume of arterial blood effectively perfusing tissue. [ 1 ] [ 2 ] ECV is a dynamic quantity and not a measurable, distinct compartment. [ 1 ] This concept is useful for discussion of cardiovascular and renal physiology.
In a normal heart, the heart rate is the rate at which the sinoatrial node depolarizes since it is the source of depolarization of the heart. Heart rate, like other vital signs such as blood pressure and respiratory rate, change with age. In adults, a normal heart rate is between 60 and 100 bpm (normocardic), whereas it is higher in children. [56]
With a maximal stress test the level of exercise is increased until the person's heart rate will not increase any higher, despite increased exercise. A fairly accurate estimate of the target heart rate, based on extensive clinical research, can be estimated by the formula 220 beats per minute minus patient's age.
Meet the Experts: Matthew Goldstein, M.D., cardiologist at Cardiology Consultants of Philadelphia; ... meaning you may have a lower maximum heart rate and target zone, says Dr. Steinbaum. ...
"A heart rate zone is a range of heartbeats per minute (bpm) that corresponds to a specific intensity level of activity," explains Haines-Landram. "Heart rate zones are typically determined based ...
Cardiac monitoring generally refers to continuous or intermittent monitoring of heart activity to assess a patient's condition relative to their cardiac rhythm. Cardiac monitoring is usually carried out using electrocardiography , which is a noninvasive process that records the heart's electrical activity and displays it in an electrocardiogram ...
A cardiac stress test is a cardiological examination that evaluates the cardiovascular system's response to external stress within a controlled clinical setting. This stress response can be induced through physical exercise (usually a treadmill) or intravenous pharmacological stimulation of heart rate.
This measure has a false positive rate of 15-20% (which is slightly higher in women than men) and a false negative rate of 20–30%. [1] ST depression may be associated with subendocardial myocardial infarction, hypokalemia, or digitalis toxicity. [2]
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