A new predictor of improvement in regional left ventricular function assessed by ST/HR slope derived from ST
Fumio Nakano1, Shuichi Hamasaki, Minoru Tahara
1First Department of Internal Medicine, Kagoshima University, Sakuagaoka, Kagoshima, Japan.
Abstract:
This study evaluates the clinical usefulness of ST/HR slope derived from ST elevation on exercise to predict the improvement in regional wall motion following coronary revascularization in patients with healed myocardial infarction. We studied 58 patients with a diseased, infarct-related and single-vessel coronary artery. The decline calculated from the final 12 data points relating ST-segment elevation to heart rate during exercise were derived (ST/HR slope). Hypokinesis in the infarcted region was assessed by the centerline method and expressed in terms of standard deviations (SD/chord). The increase more than 30% of the SD/chord, which was defined as the improvement in regional wall motion, was seen in 23 of the 30 patients with a ST/HR slope of > or = 5.0 (microV/bpm), and in 4 of the 28 patients with a ST/HR slope <5.0 (microV/bpm) (P <.0001). Thus, a ST/HR slope derived from ST elevation on exercise identifies subgroups of patients who show a good recovery of regional wall motion.
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01:26Exercise Stress Test
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes