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The relationship between P‐P interval shortening surrounding QRS complexes during heart block and QRS duration. (A) The mean P‐P interval shortening surrounding paced QRS complexes (1.4 ± 1.1%) was significantly shorter than the mean P‐P interval shortening surrounding intrinsic QRS complexes (3.6 ± 3.6%; P = 0.02). (B) Paced QRS complexes (158.8 ± 33.0 ms) were significantly wider than intrinsic QRS complexes (117.5 ± 30.9 ms; P < 0.001).
