ST-segment deviations during pacing-induced increased heart rate in patients without coronary artery disease

ST-segment deviations during pacing-induced increased heart rate in patients without coronary artery disease.

INTRODUCTION In order to interpret ST-segment changes as an indicator of ischemia in patients with higher heart rates (HRs), the relation between ST-segment levels and HR needs to be well defined in subjects without coronary artery disease. METHODS Eighteen patients with normal ECGs in the catheterization laboratory, after radiofrequency ablation of AV nodal re-entry tachycardia or an accesso...

Contributions of myocardial ischemia and heart rate to ST segment changes in patients with or without coronary artery disease.

BACKGROUND ST changes related to ischemia at different heart rates (HRs) have not been well described. We aimed to analyze ST dynamic changes by vectorcardiography (VCG) during pacing-induced HR changes for subjects with proven coronary artery disease (CAD) and without (non-CAD). METHODS Symptomatic CAD patients scheduled for elective surgery were enrolled along with a non-CAD group. During a...

Heart rate adjustment of ST segment depression for improved detection of coronary artery disease.

Normal values for heart rate-adjusted indexes of ST segment depression during treadmill exercise electrocardiography (the ST segment/heart rate slope and the delta ST segment/heart rate index) were derived from evaluation of 150 subjects with a low likelihood of coronary artery disease, including 100 normal subjects and 50 subjects with nonanginal chest pain. Partitions chosen by the method of ...

Acute and transient ST segment elevation during bacterial shock in seven patients without apparent heart disease.

Acute elevation of the ST segment in several ECG leads was observed in seven patients with bacterial shock during the course of therapy. Six patients had bacterial pneumonia, one had acute cholecystitis, and none had a previous history of heart disease. At the onset of the ST elevation, all patients were receiving dopamine infusion, which in four of them was inadvertently increased shortly befo...

Heart Rate in Patients with Coronary Artery Disease in Latvia