[Evaluation of coronary blood flow using digital subtraction technique and cine coronary angiography: a preliminary report].

To evaluate coronary circulation in ischemic heart disease, digital image processing with cine coronary angiography was performed. Using time-density curves obtained from individual pixels, images showing the distribution of contrast density and transit time were obtained. To record angiograms, contrast medium was injected into the coronary artery in a steady manner during right atrial pacing.

Analysis of the evolution of coronary artery disease--evaluation of 227 cases by restudy of coronary arteriography.

Some 227 patients who showed a 50% or greater narrowing of at least one major coronary artery in the first study underwent recatheterization at a mean interval of 35.6 months. Coronary arterial lesions and the degree of narrowing [i.

T loop in posterior myocardial infarction: a useful clue to vectorcardiographic diagnosis.

In order to differentiate posterior (posterolateral) myocardial infarction (PMI) from the anterior shift of the QRS loop in "normal variant" cases using a vectorcardiogram, the T loop as well as the QRS loop in the transverse plane (TP) were analyzed in 34 elderly Japanese males with angiographically-proven PMI and in 197 elderly Japanese males with normal coronary arteries and ventricles. T loops in the TP were longer, narrower and more anterior in PMI cases. After this analysis, we propose new criteria for PMI: (A and B) A: maximal T vector equal or anterior to 60 degrees in TP B: at least two of the following three: maximal QRS voltage/maximal T voltage in TP equal to or less than 3.

[The effects of intravenous urokinase administration in patients with acute myocardial infarction].

The effects of intravenous urokinase administration were assessed in patients with acute myocardial infarction (AMI). Of 146 patients with AMI, 101 were admitted within 12 hours of onset of chest pain, and classified in four groups according to the method of administering urokinase. PTCR group (15 cases); PTCR was performed within six hours of onset, using less than 960,000 I.

Vectorcardiogram in multiple myocardial infarctions--Correlations between vectorcardiographic and angiographic findings.

To determine the value and limitations of vectorcardiograms (VCGS) for diagnosing multiple myocardial infarctions, correlations between VCG and angiographic findings were analyzed in 307 cases with severe asynergies due to coronary narrowings on left ventriculograms. While the presence of anterioseptal hypokinesis, corresponding to a nontransmural infarction of the anteroseptal wall, lowered the sensitivity of vectorcardiographic diagnosis for inferior and posterior myocardial infarctions, that of inferoposterior hypokinesis did not lower its sensitivity for anterior myocardial infarction. Severe asynergy, corresponding to a transmural infarction, reduced the VCG sensitivity for diagnosing myocardial infarction occurring in the opposite side of the left ventricle.

A case of normal coronary infarction after intracoronary thrombolysis with urokinase.

We report the case of a 50-year-old male who had classical ECG signs of inferior wall myocardial infarction. Intracoronary thrombolysis resulted in fragmentation of a thrombus in the lumen of the right coronary artery. Angiography 1 month later showed no abnormalities at the site of previous thrombus.