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. Author manuscript; available in PMC: 2019 Nov 1.
Published in final edited form as: Comput Biol Med. 2018 May 8;102:242–250. doi: 10.1016/j.compbiomed.2018.05.002

Table 3.

Paired comparison of S-ICD 3-lead ECG parameters in supine and standing positions

All participants (n=68) Failed S-ICD eligibility test (n=9) Passed S-ICD eligibility test (n=59)
ECG parameters Supine Standing Paired P Supine Standing Paired P Supine Standing Paired P
RR’ interval(SD), ms 918(157) 807(144) <0.0001 841(159) 750(155) 0.008 930(155) 816(142) <0.0001
QT interval(SD), ms 401(37) 390(39) <0.0001 393(46) 383(50) 0.245 402(36) 391(37) 0.0001
QTc (SD), ms 420(22) 436(31) <0.0001 429(26) 444(33) 0.136 418(21) 435(31) <0.0001
QRS duration(SD), ms 91.4(17) 89.1(17) 0.003 98.2(22) 97.8(27) 0.913 90(16) 88(15) 0.0001
PR interval(SD), ms 159(46) 151(48) 0.295 167(21) 161(22) 0.254 157(49) 150(51) 0.347
RC(SD), μV 1341(703) 1336(820) 0.248 734(470) 776(465) 0.757 1433(689) 1421(832) 0.798
RB(SD), μV 1606(701) 1530(709) 0.001 819(533) 773(436) 0.728 1726(646) 1646(672) 0.007
RA(SD), μV 614(460) 524(453) 0.0005 316(221) 293(257) 0.738 659(470) 559(468) 0.0004
SC(median, 5th-95th percentile), μV 0(0-703) 0(0-653) 0.980 0(0-2080) 0(0-1752) 0.895 0(0-650) 0(0-507) 0.994
SB(median, IQR), μV 0(0-139) 0(0-129) 0.598 161(83-268) 112(0-253) 1.00 0(0-87) 0(0-73) 0.638
SA(median, IQR), μV 346(110-654) 285(41-554) 0.008 346(161-361) 214(73-307) 0.767 356(102-688) 312(0-556) 0.006
TC(median, IQR), μV −71(-266-107) −48(−234-136) 0.198 136(−68 to 219) 131(−68 to 307) 0.635 −102(−312 to 92) −53(−258 to 102) 0.193
TB(median, IQR), μV 200(58-356) 114(−71-278) <0.0001 336(136-405) 253(146-327) 0.214 200(−39 to 332) 39(−87 to 273) <0.0001
TA(median, IQR), μV 247(107-376) 149(37-264) <0.0001 161(122-336) 146(39-205) 0.024 249(107-380) 151(0-278) <0.0001

C=Primary sensing vector; B=Secondary sensing vector; A=alternate sensing vector. Amplitudes of R, S, and T waves are reported