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During compensated hypertrophy in vivo fractional shortening (FS) remains constant until heart failure (HF) develops, when FS decreases from 70% to 39%. Compensated hypertrophy is accompanied by an increase in INa,late and a decrease in Na+ ,K+ -ATPase current. These changes persist as HF develops. SR Ca2+ content increases during compensated hypertrophy then decreases in HF. In healthy cells, increases in SR Ca2+ content and Ca2+ transients can be achieved by the same amount of inhibition of the Na+ ,K+ -ATPase as measured in the diseased cells. SERCA function remains constant during compensated hypertrophy then decreases in HF, when there is also an increase in spark frequency and spark-mediated Ca2+ leak. We suggest an increase in INa,late and a decrease in Na+ ,K+ -ATPase current and function alters the balance of Ca2+ flux mediated by the Na+ /Ca2+ exchange that limits early contractile impairment.
Pubmed ID: 30811606 RIS Download
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