Effect of Acute Mental Stress on Heart Rate and QT Variability in Postmyocardial Infarction Patients
Table 1
General characteristics in the three study groups.
Variables
LVEF ≤ 45% group N: 20
LVEF ≥ 50% group N: 10
Control group N: 10
P
Age, years
Ns
Male/Female
16/4
8/2
6/4
Ns
BMI, kg/m2
Ns
HR, beats/min
Ns
QTBazett
Ns
LVEF, %
<.001
NYHA class, I/II/III
0/9/11†§
6/4/0*§
10/0/0†*
<.001
Potassium, mEq/dL
Ns
Data are expressed as mean ± SD. BMI: body mass index; HR: heart rate; LVEF: left ventricular ejection fraction; NYHA: New York Heart Association; LVEF < 45% Group versus Controls; § LVEF < 45% Group versus LVEF > 50% Group; * LVEF > 50% Group versus Controls.