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Table 3 Vector and protractor measured angles and their respective p-values for the QRS duration (QRSd, milliseconds), corrected QT interval (QTc, milliseconds), the right precordial directed angle (RPD angle), and right root mean square QRS (RtRMS-QRS)respectively for different subsets of patients including controls, arrhythmogenic right ventricular dysplasia/cardiomyopathy patients who meet 12-lead 2010 Taskforce criteria (ECG-positive), who don’t meet 12-lead 2010 Taskforce criteria (ECG-negative), who are ECG-negative without bundle branch blocks (BBB) and who are ECG-negative who have signal average ECG’s do not have any late potentials (SAECG-). P-values as compared to controls

From: Right precordial-directed electrocardiographical markers identify arrhythmogenic right ventricular cardiomyopathy in the absence of conventional depolarization or repolarization abnormalities

Parameter QRSd (ms),[p-value] QTc (ms),[p-value] SPQRS-T angle RPD angle RtRMS-QRS
Controls (N = 66) 91.5 (85.5 to 99.0) 405.0 (387.5 to 430.2) 24.1 (13.5 to 42.1) 54.4 (48.9 to 61.5) 1.54 (1.17 to 1.90)
ARVD/C ECG-positive (N = 89) 104.0 (94.0 to 122.0), [<0.001]* 425.0 (403.0 to 449.0), [0.022]* 43.8 (23.6 to 72.9), [0.228] 74.8 (58.4 to 94.7), [0.971] 0.81 (0.63 to 1.13), [0.371]
ARVD/C ECG- and no BBB (N = 66) 98.0 (86.0 to 104.0), [0.052]s 412.0 (399.0 to 430.0), [0.061] 33.6 (16.7 to 54.2), [0.004] 76.2 (62.3 to 92.9), [<0.001] 0.81 (0.64 to 1.15), [<0.001]
ARVD/C ECG-, no BBB, SAECG-negative (N = 20) 93.0 (85.5 to 100.0), [0.947] 420.5 (397.5 to 430.0), [0.057] 40.9 (22.3 to 55.7), [0.081] 71.2 (60.4 to 84.7) [<0.001] 0.77 (0.67 to 1.18), [<0.001]
  1. *indicated significant p-value < 0.050