International Scholarly Research Notices

Clinical Study

Effect of Acute Mental Stress on Heart Rate and QT Variability in Postmyocardial Infarction Patients

Table 1

General characteristics in the three study groups.
VariablesLVEF ≤ 45% group N: 20LVEF ≥ 50% group N: 10Control group N: 10P
Age, years 4 9 ± 1 1 5 2 ± 5 4 9 ± 9 Ns
Male/Female16/48/26/4Ns
BMI, kg/m2 2 7 . 2 ± 4 . 3 2 6 . 8 ± 1 . 0 2 4 . 7 ± 2 . 6 Ns
HR, beats/min 6 9 ± 9 6 7 ± 7 6 1 ± 7 Ns
QTBazett 0 . 4 1 7 ± 0 . 0 5 0 0 . 3 8 4 ± 0 . 0 3 1 0 . 3 7 8 ± 0 . 0 2 1 Ns
LVEF, % 3 3 ± 7 † § 5 3 ± 4 ∗ § 6 5 ± 6 † ∗ <.001
NYHA class, I/II/III0/9/11†§6/4/0*§10/0/0†*<.001
Potassium, mEq/dL 4 . 1 9 ± 0 . 2 1 4 . 1 9 ± 0 . 1 7 4 . 2 4 ± 0 . 2 7 Ns
Data are expressed as mean ± SD. BMI: body mass index; HR: heart rate; LVEF: left ventricular ejection fraction; NYHA: New York Heart Association; 𝑃 < 0 . 0 5 LVEF < 45% Group versus Controls; § 𝑃 < 0 . 0 5 LVEF < 45% Group versus LVEF > 50% Group; * 𝑃 < 0 . 0 5 LVEF > 50% Group versus Controls.