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  Indian J Med Microbiol
 

Figure 7: (a) Postoperative child with second-degree heart block. (b) Third-degree heart block after atrioventricular septal defect repair demonstrating P waves “marching through” QRS complexes

Figure 7: (a) Postoperative child with second-degree heart block. (b) Third-degree heart block after atrioventricular septal defect repair demonstrating P waves “marching through” QRS complexes