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We directly tested the effects of nitric oxide (NO) on Na ϩ channels in guinea pig and mouse ventricular myocytes using patch-clamp recordings. We have previously shown that NO donors have no observed effects on expressed Na ϩ channels. In contrast, NO (half-blocking concentration of 523 nmol/L) significantly reduces peak whole-cell Na ϩ current (I Na ) in isolated ventricular myocytes. The inhibitory effect of NO on I Na was not associated with changes in activation, inactivation, ordoi:10.1161/hh2301.100801 pmid:11717157 fatcat:oxefcmwruzb63eax6n3apm4f4y