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Abstract The present study invesitgates the effect of stimulation frequency and external Ca2+-concentration on intracellular systolic and diastolic Ca2+ as well as on the force-frequency relationship (FFR, 0.5 to 3.0 Hz, 1.0 mmol/l extracellular Ca2+) in human myocardium using fura-2 AM loaded electrically stimulated right atrial muscle strips (coronary bypass surgery, n = 15, age: 60.0 1.9 years)...
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