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Biomedical subjects

H Baba

Publications and source records attributed to H Baba.

At least 523 records · Page 29Linked to original sources
PubMed1979

[A study of regional cerebral blood flow by intravenous injection method of Xenon-133 (author's transl)].

Regional cerebral blood flow (rCBF) was determined in man by Xenon-133 intravenous bolus injection technique. This method is of value especially for patients with stroke. The measuring system constituted of a 16 channel cerebrograph (rCBF 1656, Meditronic, Denmark) and a minicomputer (AI Electronics, Japan). Then, for an estimation of rCBF, two compartment analysis was applied in which a special computer program was used for this purpose. Amount of Xenon-133 in expired air was used for calculation, since we confirmed that Xenon-133 clearance in expired air was similar to that in arterial blood except for those patients with obstructive lung disease and so on. In normal adults, rCBF of the gray matter was 67 +/- 13 ml/100 g brain/min. (95% confidence limits). Patients who had been TIA or RIND, revealed a decrease of rCBF of 33--49 ml/100 g brain/min. bilaterally, although they did not show any clinical signs at the time of measurement. Contrariwise, two cases of Moya-moya disease showed a normal value of rCBF at their silent periods.

Blood Volume↗
PubMed1976

Hemodynamic effects of venous valves in aorto-coronary bypass grafts.

Use of the saphenous vein in aorto-coronary bypass surgery for treatment of occlusive coronary artery disease is a well-established technique. Use of the mammary artery for the same purpose has also been favorably reported. This study was undertaken to determine whether a vein graft containing a valve would have an added advantage. A comparison of the effect of competent and incompetent valves in vein grafts on the hemodynamics of coronary circulation was made. In a group of 18 dogs, a 5 cm. portion of each dog's cephalic vein containing a valve was used in a single aorto-coronary bypass graft. Flow measurements were made between the valve and the anastomosis of the graft to the left anterior descending coronary artery (LAD). The valve was made temporarily incompetent by the insertion of a spring wire basket, 3.5 mm. in diameter, through the valve via a side branch. The flow of blood through the venous graft with the competent valve was 11.0 +/- 2.6 per cent higher than with the incompetent valve. An analysis of flow patterns showed that this increased flow could be attributed to a reduction of backflow during systole and an increase in forward diastolic flow. Results suggest that postoperative myocardial perfusion is enhanced by the presence of valves in aorto-coronary bypass vein grafts.

Animals↗