When a patient is on a diuretic, it causes them
When a patient is on a diuretic, it causes them to urinate more frequently. Potassium ions are lost in urine, so a diuretic often causes decreases in blood K+ ions. What is the term for this condition? What effects on the heart can it have?
A. The term for a decreased blood potassium level is hypocalcemia. Hypocalcemia interferes with contraction of the myocardium and results in a decreased stroke volume.
B. The term for a decreased blood potassium level is hypokalemia. Hypokalemia alters the RMP of cardiac muscle because it increases the diffusion gradient for K+ leaving the cell. The increased loss of positively charged K+ ions causes the RMP to become more negative (hyperpolarized), which inhibits the heart’s ability to contract.
C. The term for a decreased blood potassium level is hypokalemia. Hypokalemia alters the RMP of cardiac muscle because it decreases the diffusion gradient for K+ leaving the cell. Fewer positively charged K+ ions leave, which causes the RMP to become less negative and closer to threshold.
D. The term for a decreased blood potassium level is hypocalcemia. Hypocalcemia alters the RMP of cardiac muscle because it increases the diffusion gradient for K+ leaving the cell. The increased loss of positively charged K+ ions causes the RMP to become more negative (hyperpolarized), which inhibits the heart’s ability to contract.
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