Using the patch-clamp method in 27 different inside-out patches it was shown for the first time that they defined the basic parameters of the functioning of single ATP-sensitive K+ channels in the human adult ventricular cardiomyocytes membrane. At [K+]o = 140 mM single channel conductance (over the linear part of the I-V relation) reaches 100 pS. The possibility of the existence of these channels' conductance sublevels as well as the cluster character of their localization in sarcolemma is shown. The channel activity demonstrates an obvious run-down with tau at about a minute. The analysed channels possess one open and two closed states.
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