Fig. 4From: Temporary transvenous pacing guided by the combined use of ultrasound and intracavitary electrocardiography: a feasible and safe techniqueIntracavitary ECG (lead V1) showing the cardiac electrical activity when the EC is free-floating into the RV (a) and when this is contacting the endocardium of the RV (b), as demonstrated by a subepicardial injury pattern (arrow)Back to article page