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Biomedical subjects

A M Ross

Publications and source records attributed to A M Ross.

123 records · Page 7Linked to original sources
PubMed1977

Angiographic evaluation of saphenous vein bypass grafts: artifactual "occlusion" caused by dual sources of flow.

Angiography after coronary bypass surgery has engendered conflicting reports regarding the effect of grafting on proximal lesions. Analysis of a series of postoperative arteriographic injections demonstrates that routine studies may produce artifactual "occlusion" caused by altered or competitive flow relations. High pressure contrast injection can reveal persistent stenotic lumens at sites of apparent complete occlusion. Thus, angiographic technical factors and not surgical sequelae may be responsible for the disparate reports on this subject.

Coronary Angiography↗
PubMed1976

Risk of death related to coronary arteriography: role of left coronary arterial lesions.

Seven deaths occurred within 5 days after study in 800 consecutive patients undergoing arteriography. All seven patients had severe anginal symptoms at rest or with minimal exertion, and all had extensive coronary artery disease. Four had left main coronary artery disease, and three had hemodynamically equivalent lesions involving both the proximal left anterior descending and circumflex branches. It is postulated that these deaths are due to a stress imposed upon patients in unstable condition with a particularly extensive myocardial perfusion deficit.

Angina Pectoris↗
PubMed1976

Sinoventricular conduction in atrial standstill.

Sinoventricular rhythm implies preserved sinus node function with conduction of impulses to the A-V junction without generalized atrial excitation. Impulse propagation in such cases is presumably via specialized internodal tracts. In this present case, synchronized but localized activation from an area of the right atrium preceded each QRS, without generalized atrial depolarization. These recordings are offered as further evidence for the clinical occurrence of sinoventricular rhythm in humans.

Aged↗
PubMedDate not supplied

High dose propranolol in the treatment of angina pectoris: relationship of dose to blood levels and hemodynamic consequences.

Propranolol blood levels and the effect of these levels on hemodynamic parameters were evaluated in 25 patients with coronary artery disease undergoing cardiac catheterization and coronary angiography. Fifteen patients were receiving high doses of propranolol (320--1920 mg/day) while ten patients were receiving conventional doses (80--240 mg/day). The high dose propranolol group had significantly higher plasma propranolol levels than the conventional dose group (788 +/- 134 SD vs. 43 +/- 7.2 ng/ml SD), and there was a direct linear relationship between propranolol dose and plasma drug levels (r = 0.85, P < 0.001). There were no significant differences between high and conventional dose propranolol groups in terms of all hemodynamic parameters measured, namely ejection fraction, ventricular volume, cardiac index, or peripheral vascular resistance. Despite high drug dosage and blood levels, only mild side effects were seen.

Adult↗