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Nurse Mike introduces a tutorial on potassium’s role in body functions, particularly in maintaining heart and muscle contractions. He explains hyperkalemia, defined as a potassium level over 5.0, highlighting significant symptoms: the heart becomes tight and contracted, leading to ST elevation, peaked T-waves, wide QRS complexes, and potentially v-fib or cardiac standstill. Other manifestations include hypotension (low blood pressure) and bradycardia, due to the heart's tightness. In the gastrointestinal (GI) system, hyperkalemia causes diarrhea and hyperactive bowel sounds. Neuromuscularly, it results in paralysis in the extremities and paresthesia.
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