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• W1969012414 abstract "Severely hypertrophied myocardium was described to have a reduced tolerance towards ischemia. For non-hypertrophied hearts inconclusive findings on the Ca(2+)-responsiveness are reported. Information sensitivity to reversible ischemia and on postischemic Ca(2+)-responsiveness of hearts with clinically common moderate hypertrophy is lacking. Thus, the responsiveness of hypertrophied and normal postischemic myocardium to positive inotropic stimulation should be investigated in the present study.Hearts from spontaneously hypertensive rats (SHR, 4 months old) with significant LV-hypertrophy (+ 50%) and hearts from normotensive 4 months old Wistar rats were investigated using an isovolumic beating isolated heart model (8 hearts/each of the 8 groups). Functional recovery after 30 min of no-flow ischemia was 78 +/- 1% and 77 +/- 3% of preischemic control data in hypertrophied and non-hypertrophied hearts assessed as developed left ventricular pressure (non-ischemic controls: 95 +/- 2% in hypertrophied and 93 +/- 3% in non-hypertrophied controls). Maximum short-term stimulation with Ca2+ revealed a decreased peak left ventricular pressure of 124 +/- 4% in hypertrophied and 120 +/- 5% in non-hypertrophied postischemic hearts, as compared with non-ischemic controls 138 +/- 3% and 157 +/- 5%, respectively ( p < 0.01). A maximum dose of dopamine stimulated hypertrophied and non-hypertrophied postischemic hearts comparable to Ca2+. Analysing the dose-response curve for Ca(2+)-stimulation, the sensitivity expressed as fraction of the maximum was identical in non-ischemic and postischemic myocardium of hypertrophied and non-hypertrophied ventricles in spite of the reduced peak values.The findings demonstrate that after moderate reversible ischemia the steady-state function is similarly decreased in hypertrophied and non-hypertrophied postischemic myocardium. The maximum response to Ca2+ is significantly reduced in both types of myocardium, while the Ca2+ sensitivity is unchanged. Identical results after maximum dopamine stimulation as after Ca2+ indicate that the releasibility of Ca2+ and the beta-adrenoceptors are not the critical causes for the postischemic dysfunction in hypertrophied or non-hypertrophied myocardium." @default.
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• W1969012414 date "1998-04-01" @default.
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• W1969012414 title "Inotropic response of stunned hypertrophied myocardium: responsiveness of hypertrophied and normal postischemic isolated rat hearts to calcium and dopamine stimulation" @default.
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• W1969012414 doi "https://doi.org/10.1016/s0008-6363(97)00322-2" @default.
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