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Biomedical subjects

Y Nakatsuchi

Publications and source records attributed to Y Nakatsuchi.

36 records · Page 2Linked to original sources
PubMed1994

Arterial grafting with the telescoping anastomotic technique for arterial defects.

An arterial graft was taken from the left femoral artery of the rat and grafted into the right femoral artery using the telescoping anastomotic technique at both the proximal and distal anastomoses to compare the patency rate with that of the vein grafts interposed into the arterial defect with the same telescoping technique. The time required for each anastomosis was about 10 minutes and all of the 31 grafts remained patent without application of xylocaine, yielding a higher patency rate than the vein grafts interposed in an arterial defect. The telescoping technique proved to be so dependable that it could be used at least twice in an artery. Inserting one vessel stump into another using the telescoping technique may not itself be responsible for the failure of vein grafts interposed in an arterial defect, but distortion of the slack venous wall of the graft by high arterial blood pressure is.

Anastomosis, Surgical↗
PubMed1993

An absence of structural changes in the proximal femur with osteoporosis.

The hypothesis that osteoporosis occurs not as a preferential loss of the tensile trabeculae but as a general loss of bone was tested by using bone mineral densitometry and an indentation test on dissected proximal femora. As osteoporosis advanced a significantly correlated decrease was found in both bone mineral density and mechanical properties between the principal compressive and tensile trabeculae. The decrease correlated with a decrease in the Singh index. These findings led to the conclusion that a sequential bone loss from the tensile trabeculae to the compressive ones did not occur as Singh reported, but instead a generalized loss of bone mineral in both the tensile and compressive trabeculae supervened. The structural changes, on which the grading system by Singh was based, were not observed in the proximal femur affected by osteoporosis.

Aged↗
PubMed1993

Introduction of loop sutures in microsurgical telescoping anastomosis.

We have designed a loop suture technique for use in microsurgical telescoping (sleeve) anastomosis to prevent problems from the free floating inserted vessel stump. The patency rate of rat femoral arteries repaired with this technique was 95% and that of interpositional vein grafts, in which both the proximal and distal anastomoses were completed with the same sleeve technique, was 81.0%.

Anastomosis, Surgical↗
PubMed1993

Vein grafting with the telescoping anastomotic technique for venous defects.

The telescoping anastomotic technique was used at both ends of autogenous vein grafts bridging a defect in slow-running, vulnerable veins. This was done on left epigastric veins of the rat, the central part of which was used as a graft. In the right epigastric veins, both the proximal and distal anastomoses were repaired using the conventional anastomotic technique. The overall patency rate of the grafts repaired with the telescoping anastomotic technique was 27/29 (93.3%) compared to 17/28 (60.7%) in the conventional group. The telescoping technique was also easier to perform than the conventional method.

Anastomosis, Surgical↗
PubMed1992

New method for autogenous vein grafting with the telescoping anastomotic technique.

An experimental study was performed to examine whether a microsurgical telescoping anastomotic technique could be applied twice in one vessel, for use in autogenous vein grafting. The rat inferior epigastric vein was grafted into a defect created in the femoral artery. The original telescoping method of Lauritzen was used, with two additional suture placements, to allow anastomosis at both proximal and distal sites. By placing the four sutures symmetrically and carefully timing the removal of the proximal and distal clamps, we achieved a patency rate of 77.3%. This is a new method for autogenous vein grafting that may serve as a prototype for an easier and possibly faster vein grafting technique. Our results appear to indicate that complete coaptation of the severed vessel ends is not necessarily required for patency in microvascular repair.

Abdominal Muscles↗
PubMed1992

Long-term histologic results of vein grafting with the telescoping anastomotic technique.

We studied the long-term histologic results of a new method for autogenous vein grafting to examine whether stenosis at the anastomosis is maintained over time. Nineteen rat inferior epigastric veins were grafted into the femoral artery using a telescoping sleeve technique at both the proximal and the distal anastomoses. Specimens were studied macroscopically and histologically three months later. Stenosis at the anastomosis was located near the tip of the inserted vessel. The smallest inner diameters of the proximal and distal anastomoses were about 80% of the corresponding femoral artery diameter; no statistically significant difference was found between the two anastomoses. The grafts had a thickened wall due to intimal hypertrophy and fibrosis of the media. The inner diameter of the graft was, however, about twice that of the femoral artery, and these graft changes did not create any apparent constriction within the graft.

Abdominal Muscles↗
PubMed1989

[Estimation of myocardial viability in left ventricular regions with akinetic wall motion by postextrasystolic potentiation using list-mode radionuclide ventriculography in an interesting case with silent ischemia and with premature ventricular complexes (quadrigeminy)].

For determining an indication of percutaneous transluminal angioplasty (PTCA), a 73-year-old-man with silent ischemia and with ventricular premature complexes (quadrigeminy) were performed cardiac nuclear studies. This case had 99% stenosis in LCX (#11) and 90% stenosis in RCA (#1), and demonstrated akinetic wall motion in left ventricular (LV) inferior and posterior regions. Exercise-redistribution Tl-201 studies indicated myocardial viability in a portion of the inferior wall but not in the posterior wall. To estimate the potential contractile function in the regions with akinesis, from the list-mode data of radionuclide ventriculography, those of postsinus beats and postextrasystolic beats were separately selected and were analyzed for investigating LV wall motion and LV ejection fraction (EF). With the post-extrasystolic potentiation, LVEF increased from 36% to 45% and the systolic wall motion was augmented in the inferior wall but not in the posterior wall. From these findings we recognized the existence of myocardial viability in a portion of the inferior wall. After PTCA for the RCA lesion, improvements of the myocardial Tl-201 distribution and LV wall motion in the inferior wall were definitely observed and hence LVEF increased by 16% to contribute to an increase in exercise performance. Thus, this case indicates that the postextrasystolic potentiation is useful for determining an indication of PTCA in patients with LV asynergy, demonstrating the myocardial viability and the potential LV function.

Aged↗
PubMed1985

A new method for venous interposition grafts using fibrin glue.

We developed a new technique of venous interposition graft where the principle of sleeve anastomosis was applied at the proximal suture site and fibrin glue was used at both suture sites to prevent leakage. An advantage of this procedure was a reduction in the number of stitches, which reduced operative time and obtained good vascular healing. Since in an animal experiment a high patency rate of 97% was obtained, we applied the procedure to a clinical case with complete amputation at the PIP joint level of a long finger. Good recirculation was seen on angiography 6 weeks postoperatively.

Adhesives↗
PubMed1984

Osteoid osteoma of the terminal phalanx.

The occurrence of osteoid osteoma in the hand is rare, and the rarest of all locations is the terminal phalanx. An osteoid osteoma of the terminal phalanx of the middle finger in a twenty-four-year old woman is described. This case illustrated the very typical clinical and x-ray features of an osteoid osteoma, which made diagnosis and treatment of this rare clinical entity straightforward. On pathological examination, a bundle of nerve fibres was found in the lesion, an explanation that the pain of this tumour may have been mediated by the nervous system via the nerve fibre.

Adult↗
PubMed1980

Funicular orientation by electrical stimulation and internal neurolysis in peripheral nerve suture.

Eleven peripheral nerve lacerations around the wrists of ten patients were treated with funicular suture or nerve graft. In three freshly lacerated nerves funicular orientation could be made only by electrical stimulation to both cut ends. The electrophysiological method was also utilised to obtain funicular orientation of a proximal stump in eight old nerve lacerations. However, funicular orientation of the distal stump of old lacerations, which was not responsive to electrical stimulation, was performed anatomically by internal neurolysis from a terminal branching area up to a distal stump. By six months after the operation, motor and sensory functions of the patients with funicular suture had recovered to an excellent degree with rapid reinnervation.

Adolescent↗
PubMedDate not supplied

Cinearthrography of the Bankart lesion and anterior capsule elongation.

Diagnostic cinearthrography was performed on 3368 patients with shoulder pain during the period of 1982 through 1992. Cinearthrography identified a Bankart lesion in 128 shoulders on which surgical stabilization was performed for recurrent anterior dislocation. The operative pathologic condition for each of these patients was correlated and analyzed with the measurements of the Bankart lesion identified on the cinearthrogram. A small Bankart lesion was seen in patients with anterior capsular elongation. A larger Bankart lesion was observed in patients who did not have anterior capsular elongation. Preoperative measurement of anterior capsular elongation has been difficult. An 80% probability existed that the presence and extent of a Bankart lesion identified on a cinearthrogram could be an indicator for the presence of anterior capsular elongation. Preoperative determination of anterior capsular elongation could be useful in selection of the optimum surgical procedure to correct recurrent anterior shoulder dislocations.

Adolescent↗
PubMedDate not supplied

A less invasive surgery for rotator cuff tear: mini-open repair.

As a less invasive surgery of the shoulder, the mini-open repair was carried out from March 1997 through December 1998 in 22 patients (mini-open repair group) for all types of rotator cuff tears, except massive tears. A transacromial skin incision about 3 cm long was made. The anterior deltoid was split along its muscle fibers, and an anterior acromioplasty was accomplished by using a specially designed bone rasp. The rotator cuff was repaired with use of the McLaughlin technique. The results were compared with those obtained in 36 patients subjected to conventional open surgery from April 1994 through February 1997 (control group). No significant difference was seen between the UCLA (University of California, Los Angeles) shoulder scores of the two groups 1 year after the repair. However, active forward flexion in the mini-open group was significantly greater than in the control group 3 and 6 months after surgery. With mini-open repair, patients seem to be able to return to sports or social activities earlier than with conventional open surgery.

Adult↗