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In the heart, hypokalemia causes arrhythmias because of less-than-complete recovery from sodium-channel inactivation, making the triggering of an action potential less likely. In addition, the reduced extracellular potassium (paradoxically) inhibits the activity of the I Kr potassium current and delays ventricular repolarization.
The duration of nocturnal leg cramps is variable, with cramps lasting anywhere from a few seconds to several minutes. Muscle soreness may remain after the cramp itself ends. These cramps are more common in older people. [13] They happen quite frequently in teenagers and some people while exercising at night.
Myocardial infarction complications may occur immediately following a myocardial infarction (heart attack) (in the acute phase), or may need time to develop (a chronic problem). After an infarction, an obvious complication is a second infarction, which may occur in the domain of another atherosclerotic coronary artery, or in the same zone if ...
A heart attack occurs suddenly when an atherosclerotic plaque in one of the arteries to your heart ruptures. It can cause symptoms such as: ... Leg or buttock pain with exercise.
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