摘要:

AbstractIn using autogenous vein grafts in microvascular surgery, maintenance of compliance at the site of anastomosis is of importance in achieving patency. Using high‐frequency, 20 MHz, pulsed Doppler ultrasonography to monitor blood flow velocity through the vein graft, we have evaluated the effects of continuous and interrupted suture technique on anastomotic compliance in vessels less than 1.5 mm in diameter. In 15 dogs, 15 procedures of each technique, using the continuous technique in one limb and the interrupted technique on the contralateral limb, patency rates for both techniques, documented by arteriography, are 100% at a mean follow‐up of 11 weeks. There were no significant differences in the blood velocity profile and pulsatility proximally, distally, and at the graft site between continuous and interrupted technique. This study confirms the suggestion that autogenous vein graft has sufficient elasticity to maintain normal arterial blood velocity wavefo

ISSN:0738-1085    

DOI:10.1002/micr.1920040302

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe purpose of this study was to compare by means of microsurgical techniques a porous with an interiorly smooth siliconized vascular graft. Compatibility and patency of the graft were examined in a long term followup. A microvascular prosthesis with a particular fibrous texture was used. The fibres consisted of polyurethane (PUR), a new prosthetic material. The lumen of the prosthesis measured 1.6 mm; the outer diameter was 2.4 mm. In group A an in‐ and exteriorly microporous graft was applied; in group B the inner surface of the prosthesis was smoothed by a silicon layer. 30 SPFWistar rats were randomized in group A (n = 15) and B (n = 15), and both prosthetic materials were implanted as a substitute for an infrarenal part of the abdominal aorta. Monofile suture material (MirafilR—DR 5) size 10:0 was used for the anastomosis. The mean pressure of the aorta amounted to 108 ± 30 mm Hg. After 4 ± 2 months the total survival rate was 77% (n = 23): in group A, 80% (n = 12); in group B, 73% (n = 11). Cause of death was early thrombosis due to technical mistakes. The following results were obtained by angiography: highest patency—group A, 8; group B, 1; constriction—group A, 6; group B, 9; occlusion—group A, 1; group B, 4; total—group A, 15; group B, 14; 1 angiography technically failed. Arterial substitution in the abdominal aorta of the rat by PUR‐grafts is possible and is a suitable model for further experiments. Prosthetic material with porous structure is significantly better than that with an impermeable smooth inner surface (significance 10%, test by Bross13). The low number of experiments allows only trend information and therefore must be considered as a pilot study, though histopathological findings undoubtly point to the superiority of the porous texture of the vasc

ISSN:0738-1085    

DOI:10.1002/micr.1920040303

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractLaser Doppler flowmetry (LDF) is a noninvasive and continuous method of monitoring dermal blood flow in free flaps. There are two LDFs available for clinical application: the LD5000 Laser Doppler Perfusion Monitor and the Periflux Laser Doppler Flowmeter. Varying degrees of arterial (N = 46) and venous (N = 28) occlusion were induced in saphenous island flaps of the dog, while simultaneous measurements with the LD5000 and Periflux LDFs were made. The millivoltage output of both the LD5000 and the Periflux showed a high degree of correlation with arterial and venous occlusion and with each other.

ISSN:0738-1085    

DOI:10.1002/micr.1920040304

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractA new anastomosis technique for large‐calibered vein graft to repair a smallersized arterial defect is presented. At the proximal (upstream) anastomosis, a combination of sleeve anastomosis technique and plication of excess vessel wall is performed; and at the distal (downstream) anastomosis, the “fishmouth” incision technique is used. The patency rate obtained with this technique is quite satisfactory, which justifies its use in clinical situa

ISSN:0738-1085    

DOI:10.1002/micr.1920040305

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractAn experiment was done in rats to determine the effect of stopping the flow of blood across a fresh anastomosis. It was found that brief periods of stasis, up to 30 minutes, caused a minimal increase in the rate of thrombosis, but 60 minutes of stasis caused a significant risk of thrombosis in both arteries and veins. The thrombosis associated with stasis could be prevented by the systemic administration of heparin.

ISSN:0738-1085    

DOI:10.1002/micr.1920040306

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractTwo types of fibrous polyurethane prostheses with different compliances were implanted into the rat aorta with interrupted sutures and a running suture line. Excluding two technical failures, one unexplained death, and three infected prostheses, both groups (n = 21) showed a patency rate of 100%, up to 6 months after implantation. Rapid reendothelialisation occurred, and a stable neo‐intima was formed. Compliance of the prostheses, as well as the suture technique used, has proven to be an unimportant factor in the rat aorta model, probably due to the low magnitude of the pulsations of the rat aorta. The experience of the surgeon with microsurgical techniques seems to be an underestimated factor in determining patency rates of microvascular prosthese

ISSN:0738-1085    

DOI:10.1002/micr.1920040307

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractThe technique using the hand table for positioning of infants for microsurgical procedures of the lower extremity is presented. With this technique, the surgeon and assistant are able to sit directly opposite each other with their arms in stable resting position.

ISSN:0738-1085    

DOI:10.1002/micr.1920040308

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractAn operating table stand incorporating a rotatable mechanical surface with a motorized focusing stage carrier was designed for a standard stereomicroscope. This can be used for microsurgical experiments and practicing microsurgical techniques in small laboratory animals.

ISSN:0738-1085    

DOI:10.1002/micr.1920040309

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractPhysiologic tremor hampers the ability of students to learn microsurgical technique. An understanding of normal tremor both as to origin and methods of control would be of help. Physiological tremor arises from both mechanical and neuromuscular sources and is made worse by a number of factors. The “size principle of motoneuron recruitment” is an important physiologic consideration, and the use of biofeedback techniques enables the student to confirm his understanding of the principle. Knowledge of the factors which aggravate physiological tremor allows the microsurgeon to control his own tremor both in the laboratory and in the operating r

ISSN:0738-1085    

DOI:10.1002/micr.1920040310

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY

摘要:

AbstractExperiments were carried out to determine the effect of previous irradiation on microvascular arterial anastomoses. The study focused on regeneration of endothelial cells and thrombus formation. Careful examination with scanning electron microscopy (SEM) showed a difference between irradiated animals and a control group. In the irradiated group one can notice a decreased regeneration, a greater amount of fibrin and platelets, and a higher incidence of microthrombi.

ISSN:0738-1085    

DOI:10.1002/micr.1920040311

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1983

数据来源: WILEY