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Biomedical subjects

I Sheiban

Publications and source records attributed to I Sheiban.

69 records · Page 4Linked to original sources
PubMed1980

[Acute changes of the mechanical function of the ischaemic left ventricle by sublingual nifedipine (author's transl)].

In 20 patients, who had undergone a routine cardiac catheterization for the evaluation of anginal syndrome, some parameters of mechanical function of left ventricle (LV) were evaluated before and after left ventriculography was performed. Then, the same parameters were also measured, in identical technical conditions, after the administration of 20 mg of sublingual nifedipine (NIF). After NIF a significant decrease (P < 0.01) in left ventricular systolic and diastolic pressure, aortic diastolic pressure and left ventricular enddiastolic and endsystolic volumes was observed; while, heart rate, dP/dt max, stroke volume and ejection fraction were significantly increased (P < 0.01). Evaluation of LV segmental wall motion, after NIF, revealed no changes of wall motion in normal areas or in those with akinesis or dyskinesis; while, 68% of the areas with slight hypokinesis and 55% of those with severe hypokinesis were significantly improved after NIF (P < 0.005). Thus, we concluded that NIF does not cause a depression of LV mechanical function. The improvement of LV wall motion displayed by the areas with a transitory ischemic damage could be attributed to the reduction in preload and, more significantly, in afterload induced by NIF.

Administration, Oral↗
PubMed1976

[Morpho-functional changes of left ventricle produced by sublingual nitroglycerin (author's transl)].

Two successive left ventriculargraphs [in basal conditions and after Nitroglycerin (TNG)] were performed with the same technical procedures in 20 patients before coronary arteriography. End-diastolic and end-systolic volumes and ejection fraction were studied following Greene's modified method. Diastolic and systolic ventricular projected images were divided into four zones and their variations were evaluated after TNG. Two patients did not show any significant abnormality (pseudoangor); two others suffered from cardiomyopathy (myocardosis) with mitral regurgitation and no coronary artery disease; two had restrictive cardiomyopathy. Fourteen had a coronary artery disease: seven of them had signs of end-systolic mitral regurgitation. End-diastolic and end-systolic volumes decreased and ejection fraction increased after TNG in all of these cases except in the two suffering from cardiomyopathy (ESV increased and EF decreased). Mitral regurgitation disappeared in all of them. In patients with coronary artery disease and mitral regurgitation the volume variations were slighter, and the increase of EF was larger than in the other cases. Finally, a decrease in asynergic and hypokinetc zones was observed, whereas no variations were seen in diskinetic zones. TNG can improve left ventricular kinetics by decreasing the pre-load, the after-load and myocardial oxygen consumption. Demonstration of this improvement could be of prognostic value.

Administration, Oral↗
PubMedDate not supplied

[Congenital coronary artery malformations and associated clinical syndromes (author's transl)].

In 34 cases, corresponding to 3,7% of all patients underwent coronary arteriography for evaluation of anginal syndrome in our laboratory, it was observed a congenital coronary anomaly on their angiograms. The purpose of this paper is to verify the frequency of coronary anomalies and to evaluate relations existing between these anomalies and anginal syndrome. Coronary arteriograms, in 22 cases (2,44%), revealed exclusively; the presence of a coronary anomaly without occlusive coronary disease, which might per se justify angina. They were distributed as follows : 5 with coronary fistula, 2 with coronary aneurysms, 2 cases with single ostium and finally, 13 subjects with hypoplasia of one of the three major coronary arteries. One infant, 14 months old, had a hyperplasic left discending artery (LDA) draining in right ventricle cavity. Her ECG revealed signs of right ventricle overload. All the other cases had a typical angina syndrome with positive stress test. Left cineventriculography demonstrated left ventricle asynergy in 16 patients. We concluded that typical angina syndrome in our 22 patients, may be attributable to coronary anomalies observed at their coronary arteriograms.

Adolescent↗