Journal of the American College of Cardiology
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J. Am. Coll. Cardiol. · Nov 2000
Comparative StudyRate-dependence of QT dispersion and the QT interval: comparison of atrial pacing and exercise testing.
The study was done to determine whether variables of QT dispersion from the 12-lead electrocardiogram (ECG) are dependent on heart rate. ⋯ Dispersion of the QT interval and other ECG variables of dispersion of ventricular repolarization are independent of heart rate. Therefore, it is not necessary to rate-correct these measurements.
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J. Am. Coll. Cardiol. · Nov 2000
Randomized Controlled Trial Clinical TrialA randomized trial of the effects of early cardiac serum marker availability on reperfusion therapy in patients with acute myocardial infarction: the serial markers, acute myocardial infarction and rapid treatment trial (SMARTT).
The purpose of this study was to assess whether the immediate availability of serum markers would increase the appropriate use of thrombolytic therapy. ⋯ The availability of 0- and 1-h myoglobin and CK-MB results after ED evaluation had no effect on the use of thrombolytic therapy for patients presenting with AMI, and it slightly increased the number of patients admitted to the hospital who had no evidence of acute myocardial necrosis.
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J. Am. Coll. Cardiol. · Nov 2000
Cardiac troponin I elevation in acute pulmonary embolism is associated with right ventricular dysfunction.
The purpose of this study was to evaluate the prevalence and diagnostic utility of cardiac troponin I to identify patients with right ventricular (RV) dysfunction in pulmonary embolism. ⋯ Our data demonstrate that more than one-third of patients clinically diagnosed as having pulmonary embolism presented with elevated serum troponin I concentrations. Troponin I tests helped to identify patients with RV dilatation who had significantly more segmental defects in lung scans. Thus, troponin I assays are useful to detect minor myocardial damage in pulmonary embolism.