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Biomedical subjects

Y Kosakai

Publications and source records attributed to Y Kosakai.

At least 127 records · Page 7Linked to original sources
PubMed1985

Problems and anti-tachyarrhythmic effects of chronic atrial pacing.

Sixty-six patients in whom atrial pacemaker (AAI) were implanted were followed for one year to 5 years for the occurrence of pacing failure, sensing problems, and later AV block. Pacing failure occurred in only one patient and sensing problems occurred in 15 patients but 10 of them improved after a change of sensing. Temporal change of AV conductivity was not recognized in the majority of patients. Eighteen patients developed transient decrease in AV conductivity. Two patients developed persistent decrease in AV conductivity and ended in clinical AV block for which the pacemaker was implanted. Out of 66 patients, 22 had a history of paroxysmal atrial flutter or fibrillation (AFF) prior to AAI implantation. They were divided into two groups. Group I consisted of 20 patients in whom paroxysmal AFF disappeared after AAI implantation. Group II consisted of 22 patients in whom paroxysmal AFF persisted after AAI implantation. Electrophysiological studies prior to the AAI implantation showed that sinus rate at control was significantly slower (36.3 +/- 10.1 beats per min in Group I, 57.1 +/- 10.8 beats per min in Group II), atrial fragmented activity zone was significantly narrower (62.7 +/- 32.9 msec in Group I, 88.1 +/- 19.7 msec in Group II), and the occurrence of PAC was less at an atrial pacing rate of 70 beats per min (8% in Group I, 67% in Group II) in Group I compared to Group II.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1983

[Late results of coronary heart surgery. Late graft patency in coronary bypass procedure].

The graft patency was evaluated by a contrast enhanced computed tomography (CT) and/or digital subtraction angiography (DSA) in the follow up of aorto-coronary bypass surgery. One hundred and eighty-four patients included in this study received a total of 331 grafts. The Elipse S/200 Scanner for CT and Siemens Angiotron system for DSA were used for this study. Early in the study, selective coronary angiography were performed and the results were interpreted in 331 grafts and 86 grafts to evaluate the diagnostic reliability of CT and DSA for graft patency, respectively. While the CT scans correlated with angiographic assessment of graft patency showed 98% of sensitivity, 100% of specificity, and 98% of predicted accuracy, the DSA showed 95% of sensitivity, 100% of specificity and 95% of predicted accuracy, respectively. The patency rate in the early postoperative period was 94%, and the cumulative patency rate during follow up of 5 years was 93%, respectively. In summary, CT and DSA can provide useful information regarding graft patency in the long term follow up of aorto-coronary bypass surgery.

Adult↗