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Table 2 Assessment of electrocardiographic parameters

From: Differences in initial electrocardiographic findings between ST-elevation myocardial infarction due to left main trunk and left anterior descending artery lesions

  LMT, n = 39 pLAD, n = 224 dLAD, n = 172 P value
Normal
n = 17
RBBB
n = 17
LBBB
n = 5
Normal
n = 180
RBBB
n = 40
LBBB
n = 4
Normal
n = 159
RBBB
n = 3
LBBB
n = 10
Normal RBBB LBBB
Heart rate, bpm 93 (79, 128) 86 (72, 97.5) 76 (57.5, 119.5) 78 (65, 90.8) 87 (73.3, 113) 130.5 (84.8, 147.8) 77 (66, 93) 73 (69, 96) 81 (66.3, 97) 0.0092 0.5230 0.1628
QRS duration, ms 110 (95, 116) 156 (141.5, 162) 174 (160, 175) 96 (86.5, 106) 149 (131, 158) 162 (140, 208) 92 (87, 102) 134 (128, 146) 142 (135, 177.5) 0.0031 0.1933 0.2797
QRS axis 13 (−46.5, 60) 46 (−69, 63.5) −16 (−48, 32) 43.5 (6.9, 68) 19.5 (−57.8, 70.8) −54 (−78.5, 5.8) 33 (−9, 61) - 47 (−52, 73) −56.5 (−66, −44.5) 0.0369 0.6900 0.1473
LAHB, n 4 (23.5%) 9 (52.9%) NA 10 (5.6%) 17 (42.5%) NA 9 (5.7%) 2 (66.7%) NA 0.0135 0.5975 NA
QT interval, ms 386 (366, 407) 428 (411, 446) 466 (417, 472) 395 (368, 415.5) 414 (382.5, 450.5) 403 (386.5, 484) 398 (368, 420) 438 (364, 458) 428 (408, 482.5) 0.7386 0.6695 0.6059
QTc, ms
 Bazett 481.2 (443.5, 560.1) 507.8 (482.9, 531.3) 524.6 (459.9, 587.7) 446.0 (424.7, 464.1) 503.0 (460.7, 541.1) 579.7 (565.8, 620.7) 449.9 (429.9, 477.7) 483.1 (460.4, 491.0) 507.8 (482.7, 565.8) 0.0021 0.5043 0.1755
 Fridericia 450.1 (437.7, 496.3) 477.1 (457.1, 498.1) 504.3 (463.2, 524.2) 425.3 (410.5, 445.1) 473.0 (445.9, 499.8) 527.2 (508.6, 543.7) 431.9 (416.0, 448.4) 467.6 (425.7, 479.8) 477.9 (441.6, 535.6) 0.0041 0.6980 0.1600
  1. RBBB right bundle branch block, LBBB left bundle branch block, LAHB left anterior hemiblock, QTc corrected QT