Table 3

ECG and blood pressure response to incremental stress

Stages
Variables I II III IV p value
Controls (n = 17)
 Heart rate (beats/min)80 (14)97 (13)117 (17)127 (15)< 0.001
 Systolic BP (mm Hg)155 (18)155 (16)166 (16)168 (12)NS
 Diastolic BP (mm Hg)83 (8)81 (8)79 (10)77 (12)NS
 QRS duration (ms)93 (6)89 (6)86 (6)83 (6)< 0.001
 QTc interval (ms)444 (13)435 (12)426 (10)418 (14)< 0.001
Patients (n = 27)
 Heart rate (beats/min)79 (10)90 (16)105 (15)122 (17)< 0.001
 Systolic BP (mm Hg)152 (27)156 (28)156 (30)152 (32)NS
 Diastolic BP (mm Hg)87 (15)83 (13)78 (13)77 (15)< 0.03
 QRS duration (ms)95 (15)99 (15)104 (20)111 (22)< 0.01
 QTc interval (ms)420 (17)433 (15)447 (25)470 (34)< 0.001
  • Values are means (SD), Significance assessed by analysis of variance.

  • BP, blood pressure.