Abstract

The slow response of myocardial contractility to stretch has been linked to a nitric oxide mediated stretch-induced increase in ryanodine receptor Ca2+ release, revealed as an elevated diastolic Ca2+ spark rate in rat ventricular myocytes exposed to 10 % stretch for 10 min (Vila Petroff et al. 2001). Here, we investigate whether stretch-induced changes in Ca2+ spark rate may occur more rapidly. Isolated rat ventricular myocytes were exposed to 10 % axial stretch using computer-controlled piezo-manipulated carbon fibers, attached to the centre and one end of a cell.

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