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Biomedical subjects

M J Verta

Publications and source records attributed to M J Verta.

15 recordsLinked to original sources
PubMed1998

Alternative imaging techniques in vascular surgery.

Progress in vascular surgery has led to the need for more sophisticated methods of imaging the vascular system. Although conventional contrast angiography is still the primary method of visualizing the vascular system, it has problems and limitations that occasionally render it unsafe or inadequate. When conventional angiography cannot provide the needed information, 3 newer imaging methods--3-dimensional (3-D) spiral computed tomographic scanning, computed tomographic angiography, and magnetic resonance angiography--are being used more widely to supplement or replace contrast angiography. The advantages, disadvantages, and clinical application of each method will be described. These methods have fundamentally changed the practice of vascular surgery and a thorough knowledge of them is essential.

Aged↗
PubMed1986

Early experience with in situ saphenous vein bypass for distal arterial reconstruction.

During a 36-month period 74 patients underwent infrainguinal in situ saphenous vein bypass to the popliteal or tibial vessels. The first 54 operations were performed with standard valvulotomes and valve-cutting scissors, while in the last 20 operations a new intraluminal valve-cutting device was used to incise the valves. Ninety-four percent of bypasses were performed for limb salvage, 80% of all operations were done to the tibial vessels, and 31% of bypasses were done to the ankle vessels. The operation was attempted in 81 patients and completed in 74 patients, for a vein utilization rate of 91%. Fifty-five percent of all veins had a distal diameter of less than 4 mm (average 3.6 mm). The patency rates were 92% at 3 months and 90% at 12 and 36 months for all grafts. There were six failed grafts, all within the first 6 months, and eight diabetic patients required reoperation, two for missed valve leaflets, and three needed revision of the distal anastomosis; however, all these grafts were patent at the time of reexploration. There were four perioperative deaths and two patients had nonfatal postoperative myocardial infarctions. This study demonstrates that in situ saphenous vein grafting provides for a high vein utilization rate and suggests that the technique provides for higher graft patency and limb salvage rates than do more traditional types of procedures.

Actuarial Analysis↗
PubMed1985

Ankle bypass: should we go the distance?

This report reviewed the results of 47 distal arterial reconstructions to or below the level of the malleolus. The operations were performed by the techniques of popliteal-to-distal bypass (20 procedures) and in situ bypass (27 procedures). Seventy-five percent of patients had gangrene of ischemic ulceration, and all procedures were performed for limb salvage. Seventy-three percent of all patients were diabetic. The patency rates for popliteal-to-distal bypass with reversed saphenous vein were 92 percent at 24 months and 57 percent at 60 months, with a limb salvage rate of 70 percent at 60 months; the patency rates for popliteal-to-distal bypass with PTFE were 53 percent at 12 months and 0 at 36 months, with a limb salvage rate of 53 percent at 36 months; and the patency rate for in situ saphenous vein bypass was 96 percent at 24 months, with a limb salvage rate of 80 percent at 24 months. Early results are promising for ankle bypass using the techniques of popliteal-to-distal and in situ bypass.

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PubMed1984

Adductor canal compression syndrome.

Adductor canal syndrome is an unusual cause of acute arterial occlusion in younger men. It is the result of arterial compression by an abnormal musculotendinous band arising from the adductor magnus muscle and lying adjacent and superior to the adductor tendon. The pathogenetic mechanism of this syndrome resembles that of popliteal fossa entrapment and can become manifest after exercise. Since this syndrome occurs in younger men in whom acute arterial occlusion can lead to limb loss, recognition of the presence of apparent ischemic symptoms after exercise in an otherwise healthy young man is important. The treatment consists of the division of the abnormal band and restoration of arterial continuity by appropriate means. A search for bilateral lesions can help avoid future problems even when the symptoms are unilateral.

Acute Disease↗
PubMed1984

Composite sequential bypasses to the ankle and beyond for limb salvage.

Composite grafts of polytetrafluoroethylene (PTFE) and saphenous vein were used for sequential bypasses to the ankle and foot in 35 men and 19 women (mean age 66.5 years). Presenting symptoms were rest pain (25), digital gangrene (19), and ischemic ulcer (10). Thirty-one tibial and 23 pedal bypasses were done and were followed up to 48 months (mean 26.4 months). The ankle pressure index rose from 0.31 +/- 0.11 preoperatively to 0.77 +/- 0.21 postoperatively. Mean graft flows were 34.8 ml/min. Composite sequential grafts took 51 minutes longer to perform than femoral-tibial vein grafts. Patency rates by the life-table method were 81.4% at 2 years and 72.4% at 4 years. Graft failures after the first 10 weeks usually led to amputation. Use of PTFE as an inflow conduit permits otherwise inadequate lengths of saphenous vein to be used for anastomosis to delicate distal vessels and takes advantage of the vein's ability to tolerate low flows. Our experience suggests that the excellent patency rates make sequential bypasses a reasonable option for limb salvage.

Adult↗
PubMed1980

Sequential femoral-tibial bypass for severe limb ischemia.

Sequential femoral-popliteal-tibial bypass has been recommended for surgical treatment of severe lower limb ischemia in patients with complex multisegmental arterial occlusion. To evaluate this alternative technique critically, sequential grafting was performed in 40 limbs with severe ischemia manifest by rest pain (20), nonhealing ulceration (eight), or gangrene (12). Measurement of segmental Doppler arterial pressure revealed a significant increase in ankle brachial index from 0.29 +/- 0.15 before operation to 0.93 +/- 0.12 after operation, confirming the hemodynamic improvement among these patients. In the early postoperative period occlusion of the distal graft segment was recognized in 12 patients by a characteristic reduction of the ankle/brachial index (0.50 +/- 0.14), while the low thigh pressures remained unchanged. Recurrent severe ischemia was prevented in most by persistent patency of the proximal graft segment. Overall, significant hemodynamic improvement was achieved in 29 of 38 limbs, a limb salvage rate (76%) comparable to that reported for femoral-distal bypass or femoral-popliteal bypass to an isolated popliteal segment. Early graft failure in this series resulted in major amputation in eight of 16 limbs, a significantly lower rate than for these other techniques. Sequential bypass grafting is a useful alternative method for limb salvage. The preservation of the proximal graft patency after distal segmental occlusion may be an important characteristic of this type of reconstruction.

Arteries↗
PubMed1977

Cranial nerve injuring during carotid endarterectomy.

Injury to the greater auricular, hypoglossal and superior laryngeal nerves during carotid endarterectomy is preventable. A knowledge of regional anatomy and the mechanisms of such injury allows prevention of this complication. Unilateral individual nerve injury is generally well tolerated, but bilateral or combined nerve injuries can pose a serious threat to life. Minor modifications in technique aid greatly in avoiding nerve injury.

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PubMed1977

Pancreaticoduodenal arterial aneurysms.

Experience with four aneurysms of the pancreaticoduodenal artery is reviewed and compared to the reported experience of 19 other cases. In view of the common presentation of such lesions as intra-abdominal hemorrhage preceded by non-specific abdominal pain and other digestive symptoms, it is suggested that angiography perfomed preoperatively or intraoperatively allows definitive diagnosis and leads to specific therapy.

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PubMed1977

Lymphatic disruption in varicose vein surgery.

In order to investigate the possibility of lymphatic disruption occurring during varicose vein surgery, lymphangiography performed by a modification of the Kinmonth technique was done in seven patients before and after standard surgical ablation of primary varicose veins. All seven patients demonstrated marked disruption of lymphatics. Extravasation of lymphangiogram contrast medium at the calf level and at the thigh level precluded demonstration of the groin lymphatics. It is concluded that lymphatic disruption attends varicose vein removal and such lymphatic damage contributes to postoperative leg edema.

Edema↗
PubMed1976

Forefoot perfusion pressure and minor amputation for gangrene.

In many cases of digital gangrene, limited amputation to preserve the majority of the foot is possible. In the absence of invasive infection, forefoot perfusion pressure is the single most important factor in determining outcome of minor amputation. At ankle pressures of less than 35 mm. Hg, salvage of the foot appears to be futile. The presence or absence of diabetes mellitus has no noticeable effect on the result of amputation. Ankle systolic pressure measurement cannot supplant but should supplement clinical judgement in selecting surgical treatment for gangrene.

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PubMedDate not supplied

Mesoatrial shunting for portal decompression in alcoholic cirrhosis.

A 36-year-old Chinese man with alcoholic cirrhosis presented to hospital with exsanguinating variceal hemorrhage. Conventional porta-systemic decompressive operations could not be done because of dense vascular adhesions from two previous operations and a sub-hepatic abcess. A mesenteric-to-right-atrial shunt was done with successful control of hemorrhage and reduction of portal pressure. Long-term follow-up reveals no further bleeding and a return to full-time employment. We conclude that mesoatrial shunting is a useful alternative procedure for portasystemic decompression in alcoholic cirrhosis, although one which will be needed only in unusual circumstances.

Adult↗
PubMedDate not supplied

Isolated hypogastric artery aneurysms.

Although isolated hypogastric artery aneurysms are among the rarest of all aortoiliac aneurysms, they are among the most devastating. Two cases, one with rupture directly into the urinary bladder, are presented and the typical clinical triad of compressive symptoms, pelvic mass, and previous aneurysm is described. Intraoperative management is predicated upon sac obliteration with minimal tissue dissection. An aggressive approach to asymptomatic or minimally symptomatic aneurysms is urged due to the very high mortality following rupture.

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