[A case of stunned myocardium: dual SPECT findings similar to acute myocardial infarction (AMI)].

Emergent cardiac catheterization was performed on a 70-year-old female patient who was admitted for further evaluation of acute myocardial infarction. Coronary angiography didn't reveal any significant stenotic lesion, but levogram showed extensively abnormal contractility around the center of the apex region. On the second hospital day, 99mTc-PYP/201TlCl dual SPECT gave findings similar to those found in acute myocardial infarction, but myocardium--released enzyme stayed within the normal range.

[Transthoracic Doppler color imaging of the blood flows in the left coronary septal branches].

This study characterized blood flow signals derived from the left coronary septal branches by transthoracic Doppler color flow imaging. In the anterior ventricular septum, the signal was detected in 7 of 13 patients with aortic stenosis, 8 of 34 with hypertrophic cardiomyopathy, and 5 of 144 patients with other diseased states. The peak diastolic flow velocity assessed by a pulsed Doppler technique ranged 21-115 cm/s (mean 57).

[The relation between the anaerobic threshold and exercise-induced myocardial ischemia in patients with ischemic heart disease].

The aim of this study was to clarify whether the anaerobic threshold (AT) in patients with ischemic heart disease is determined by exercise-induced myocardial ischemia. A) The reproducibility of the VO2 at the AT (AT VO2) were studied. In 13 patients with exercise-induced myocardial ischemia, submaximal Treadmill exercise tests were performed twice using a cardiopulmonary monitoring system.

[Electrophysiologic effects of flecainide on guinea pig atrium].

We investigated the effects of flecainide on guinea pig atrial muscle. Using Langendorff's method, the whole heart of a guinea pig was perfused with Tyrode's solution containing acetylcholine (3 x 10(-7) M). Then, with right atrial extrastimulus and high frequency pacing method, the following values were measured before and after administration of flecainide (10(-7)-10(-5) M).