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Representative ECG tracings during severe hypoglycemia. Rats in the NONDIAB group experienced some second-degree heart block (dropped QRS complex [arrows]) during severe hypoglycemia. The frequency of second-degree heart block was significantly increased in the STZ and STZ+Ins groups. Recurrent antecedent hypoglycemia markedly decreased the frequency of second-degree heart block in rats in the STZ+RH group.
