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R J Feldhaus

Publications and source records attributed to R J Feldhaus.

At least 19 recordsLinked to original sources
PubMed2001

Femorofemoral bypass grafts: Factors influencing long-term patency rate and outcome.

BACKGROUND: Crossover femorofemoral bypass graft (CFFBG) was proposed in the early days of modern vascular surgery to treat patients affected with unilateral iliac artery disease who were a high surgical risk. We investigated factors influencing short- and long-term outcomes of CFFBG: METHODS: The study was designed as a retrospective clinical study in a university hospital setting with a base of 228 patients. Of these patients, 154 (67.5%) presented a high surgical risk. The indication for operation was limb-threatening ischemia in 188 (82.5%) patients. All patients underwent CFFBG: The procedure was performed in 150 patients as the primary operation and in 78 patients after previous vascular graft failure or infection, or both. A preoperative percutaneous transluminal angioplasty was performed in 57 patients (25%) to correct donor iliac artery disease. In 127 patients (55.7%), an associated vascular procedure was performed to improve the outflow. Postoperative complications; 5- and 10-year primary, secondary, and limb salvage rates; and factors influencing short- and long-term results were assessed. RESULTS: Thirteen (5.7%) postoperative deaths occurred. Postoperative mortality and morbidity rates were significantly higher in patients aged more than 65 years (7.9% versus 3.5% and 18.6% versus 6.1%, respectively, P <.03). Primary and secondary patency rates at 5 and 10 years were 70.2% and 48.1%, 82.8% and 63.2%, respectively; 5- and 10-year limb salvage and survival rates were 85.5% and 80.1%, 63.3% and 31.0%, respectively. Ten-year primary and secondary patency and limb salvage rates were significantly lower when the procedure was performed after previous vascular graft failures (50.2% versus 26.5%, P <.007; 74.1% versus 44.1%, P <.01; and 84.3% versus 72.5%, P <.03, respectively). Five- and 8-year patency rates of autogenous vein CFFBG (34.3% and 22.8%, respectively, P <.03) were significantly lower than those of expanded polytetrafluoroethylene (71.1% and 59.8%, respectively) and polyester (77.3% and 50.3%, respectively) CFFBG: Moreover, 5- and 10-year primary and secondary patency rates were significantly better when externally supported grafts were used as compared with those without external support (80.1% and 69.9% versus 61.1% and 21.1%, P <.01; 88.8% and 75.9% versus 78.9% and 45.4%, P <.05, respectively). Multivariate analysis showed that the only variable associated with poor primary and secondary patency and limb salvage rates was the operation performed after previous vascular graft failures (P <.04, P <.03 and P<.05, respectively). CONCLUSIONS: CFFBG allows early and long-term results similar to those obtained with reconstructions originating from the aorta when it is performed as a primary operation when an adequate outflow is provided and externally supported prosthetic material is used.

Aged↗
PubMed2001

Comparison of femorofemoral and aortofemoral bypass for aortoiliac occlusive disease.

BACKGROUND: Role and results of femorofemoral bypass grafting, usually reserved to high-risk patients affected with unilateral iliac artery occlusion, are still debated. METHODS EXPERIMENTAL DESIGN: retrospective clinical study. SETTINGS: University Hospital. PATIENTS: seventy-six high-risk patients (group 1) who underwent a primary expanded polytetrafluoroethylene (ePTFE) externally supported femorofemoral bypass graft were retrospectively compared to two additional groups of patients selected from the entire series of patients who underwent an aortobifemoral bypass graft. Patients of group 2 (n=80) were randomly chosen to determine differences in risk factors, associated diseases, previous abdominal operations, operative indications, preoperative findings and outcome. Patients of group 3 (n=50) were matched for sex, risk factors, associated diseases, previous abdominal operations, operative indications and preoperative findings with those of group 1 to assess the importance of the type of operation in determining the outcome of the procedure. RESULTS: Postoperative mortality (6, 4 and 6%, respectively), 5-year primary and secondary patency (71, 80, 83% and 80, 87, 87%, respectively) and limb salvage rates (78, 87 and 87%, respectively) were similar among the groups (p=NS, p=NS, p=NS, respectively). Five-year survival rate of group 2 was significantly better than that of group 1 and 3 (p<0.04 and p<0.04, respectively). CONCLUSIONS: Primary ePTFE externally supported femorofemoral bypass graft in high-risk patients is safe and produces long-term results similar to aortofemoral reconstruction.

Aged↗
PubMed1999

Long-term results and outcomes of crossover axilloaxillary bypass grafting: A 24-year experience.

OBJECTIVE: The outcome of crossover axilloaxillary bypass grafting in patients with stenosis or occlusion of the innominate or subclavian arteries was investigated. METHODS: The study was designed as a retrospective clinical study in a university hospital setting with 61 patients as the basis of the study. Fifty-eight patients (95.1%) had at least two risk factors or associated medical illnesses for atherosclerosis, and 35 patients (57.4%) had concomitant carotid artery stenosis that necessitated a staged procedure in 12 patients (19.7%). The patients underwent a total of 63 crossover axilloaxillary bypass grafting procedures. Demographics, risk factors and associated medical illnesses, preoperative symptoms and angiographic data, blood flow inversion in the vertebral artery, concomitant carotid artery disease, graft shape, caliber and material, and intraoperative and postoperative complications were studied to assess the specific influence in determining the outcome. RESULTS: One postoperative death (1.6%), four early graft thromboses (6.2%), and six minor complications (9. 8%) occurred. The overall mortality and morbidity rates were 1.6% and 16.1%, respectively. During the follow-up period (mean, 97.3 +/- 7.9 months), we observed five graft thromboses (8.3%). Primary and secondary patency rates at 5 and 10 years were 86.5% and 82.8% and 88.1% and 84.3%, respectively. Overall, two patients (3.3%) had recurrence of upper limb symptoms and none had recurrence of symptoms in the carotid or vertebrobasilar territory. The 5-year and 10-year symptom-free interval rates were 97.7% and 93.5%, respectively. Nine patients (15%) died of unrelated causes. The 5-year and 10-year survival rates were 93.2% and 67.3%, respectively. Multivariate analysis showed that no specific variables exerted an influence in the short-term and long-term results and the outcome. CONCLUSION: The optimal outcome of axilloaxillary bypass grafting supports its use as the most valuable surgical alternative to transthoracic anatomic reconstructions for innominate lesion, long stenosis of the subclavian artery, and short subclavian artery stenosis associated with ispilateral carotid artery lesions.

Adult↗
PubMed1997

Descending thoracic aorta-to-femoral artery bypass grafts.

BACKGROUND: Descending thoracic aorta-to-femoral artery (DTAFA) bypass graft is an alternative procedure to revascularize lower limbs. METHODS: Between 1976 and 1996, 41 patients underwent DTAFA bypass grafts. Operative indications consisted of previous abdominal graft thrombosis (22 cases, group 1), abdominal operations (8, group 2), initial vascular operation in the presence of difficult aortas (6, group 3), and infection of aortic grafts (5, group 4). RESULTS: Perioperative mortality was 5%. Cumulative 10-year primary patency, limb salvage, and survival rates were 64%, 79%, and 55%, respectively. Breaking down the result on the basis of the four groups, DTAFA bypass grafts performed for infection of previous aortic grafts had a significantly lower primary patency rate (25% at 24 months; P < 0.004) with dismal limb salvage (31% at 24 months; P < 0.001) and survival rates (0% at 24 months; P < 0.005). CONCLUSIONS: DTAFA bypass grafts can be safely and durably used in patients who had thrombosis of previous abdominal grafts or had a difficult abdomen or as the initial vascular operation in the presence of difficult aortas. Conversely, dismal results are obtained in the treatment of aortic graft infection.

Aged↗
PubMed1997

Aortoiliofemoral bypass graft in young adults: long-term results in a series of sixty-eight patients.

BACKGROUND: The aim of this study was to investigate surgical indications and the long-term outcomes of aoroiliofemoral reconstructions in adults younger than 45 years. METHODS: Between 1973 and 1990, 1256 patients underwent infrarenal abdominal aortic reconstruction for aortoiliofemoral occlusive disease. Sixty-eight (5.4%) patients (group 1) were less than 45 years old and form the basis of the analysis. They were retrospectively compared with two additional groups of patients 45 years and older selected from the entire series. Patients in group 2 (n = 100) were randomly chosen to determine differences in risk factors, associated diseases, operative indications, preoperative findings, and outcomes. Patients in group 3 (n = 70) were matched with those in group 1 for gender, risk factors, associated diseases, preoperative findings, and operative indications to assess the importance of age in determining the short- and long-term outcomes of aortoiliofemoral reconstructions. RESULTS: Postoperative mortality rates (1.5%, 4%, and 4.3% for groups 1, 2, and 3, respectively) and major complication rates (4.4%, 7%, and 7.1% for groups 1, 2, and 3, respectively) were comparable among the three groups. Ten-year secondary patency rates were 84.6%, 70.6%, and 80.3%, for groups 1, 2, and 3, respectively (p = not significant). Ten-year limb salvage rates were 86.9%, 78.2%, and 80.6%, for groups 1, 2, and 3, respectively (p = not significant). During follow-up a significantly higher percentage of myocardial infarction was recorded in group 1 as compared with group 2 (p < 0.03) and group 3 (p < 0.04). The 10-year survival rate for group 1 was significantly lower than that of group 2 (29.0% versus 46.9%; p < 0.005). CONCLUSIONS: Aortoliofemoral reconstruction in patients younger than 45 years is a safe procedure with low operative risks and good long-term results in patency and limb salvage rates. However, life expectancy is poor because of the high incidence of deaths related to coronary artery disease.

Adult↗
PubMed1997

Carotid endarterectomy in young adults: is it a worthwhile procedure?

PURPOSE: The aim of the study was to investigate surgical indication and long-term outcome of carotid endarterectomy (CE) in young adults. METHODS: Between 1973 and 1990, 1693 patients underwent CE. Forty-nine patients (group T) 35 to 45 years of age who had carotid artery stenosis greater than 70%, formed the basis for the analysis. They were compared with two additional groups of patients older than 45 years of age selected from the entire series. Group 2 was randomly chosen to determine differences in risk factors, associated diseases, operative indications, preoperative findings, and outcome. Group 3 was matched with patients in group 1 for sex, risk factors, associated diseases, preoperative findings, and operative indications to assess the importance of age in determining the short- and long-term outcome of CE. RESULTS: Postoperative mortality, cerebrovascular accidents, and cardiac complications in patients of group 1 (2%, 2%, and 2%, respectively) were similar to those of the other groups (p = NS). During the follow-up (76.7 +/- 3.6 months; range, 1 to 120 months) the incidence of strokes and transient ischemic attacks in group 1 was lower than in group 2 (p < 0.05) but similar to group 3 (p = NS). Ten-year disease-free intervals were 75.7%, 58.7%, and 77.6%, respectively, for groups 1, 2, and 3. Mortality rate unrelated to cerebrovascular disease was similar between group 1 and group 3 (p = NS) but was higher in group 1 than in group 2 (p < 0.02). Ten-year survival rates were 46.1%, 71.7%, and 55.5%, respectively, for groups 1, 2, and 3. CONCLUSIONS: CE in patients younger than 45 years of age is a safe procedure with low operative risks and good disease-free intervals. However, life expectancy is poor because of the high incidence of deaths resulting from complications of atherosclerosis.

Adult↗
PubMed1996

Fresh vein allograft survival in dogs after cyclosporine treatment.

Synthetic grafts are widely used for peripheral arterial reconstructions when autologous veins are not available, but their results have not been satisfactory. Venous allograft may be used as an alternative to synthetic prostheses. The aim of the study was to explore the immunosuppressive efficacy of Cyclosporine A (CyA) as a means of preventing venous allograft failures and rejection. We utilized 56 mongrel dogs. Immunological incompatibility was checked with the skin graft method. Donor inferior vena cava was transplanted into the infrarenal abdominal aorta of recipient animals. One group (group 1, 10 dogs) served as a control and three groups received CyA treatment regimens. Group 2 (10 dogs) received postoperative oral CyA treatment for 30 days. Group 3 (12 dogs) received a vein graft pretreated with a CyA solution without postoperative immunosuppressive therapy. Group 4 (9 dogs) received a vein graft pretreated with a CyA solution and postoperative CyA treatment for 30 days. Allografts were examined at 30 days for patency, aneurysmal dilatation, gross structural changes, inflammatory response, and lymphocytic infiltration. Sex chromatine assessment determined the origin (donor or recipient) of the endothelial cells. The allografts from groups 1 and 3 showed significant aneurysmal dilatation and perivenous inflammation when compared to dogs treated with oral CyA therapy (P < 0.0002). Moreover allografts treated with CyA therapy had a better-developed venous neointima (P < 0.009) with less fibrin (P < 0.02) and thinner medial (P < 0.0009) with less fibrin (P < 0.02), and thinner medial (P < 0.0009) and adventitial layers (P < 0.02). No significant differences were observed in neointimal thickness among the four groups. Lymphocytic infiltration was greater in the group of animals who did not receive oral CyA therapy (P < 0.0004). Barr bodies status showed significant differences between oral CyA treated groups and nontreated groups (P < 0.0003). Oral CyA therapy reduced aneurysmal dilatation and immunological response, promoted the development of a neoendothelium, and preserved the structure of the venous layers. Graft pretreatment with CyA flushing did not have a significant immunosuppressive effect.

Animals↗
PubMed1996

Femoral artery aneurysms: long-term follow-up and results of surgical treatment.

Aneurysmal dilatation of the femoral artery is a rare condition of uncertain aetiology. Between January 1972 and December 1992, 31 atherosclerotic femoral aneurysms in 22 patients were seen. There were 21 men and 1 woman; mean(s.d.) age was 70.1(10.4) years. Thirteen (42%) femoral aneurysms (group 1) were isolated aneurysms, two being bilateral. Eighteen (58%) were associated with a non-contiguous abdominal aortic aneurysm, four being unilateral and seven bilateral femoral aneurysms (group 2). The mean(s.d.) size of these aneurysms was 4.7(1.5) and 3.5(0.7)cm in groups 1 and 2 respectively (P< 0.01). Of the limbs in group 1,12 were treated by an interposition bypass. A ruptured profunda femoris artery aneurysm was ligated in one limb as an emergency operation. All patients in group 2 underwent an aortobifemoral graft. There was one operative death. Three early thromboses were observed; two autogenous saphenous vein interposition grafts and one limb of an aortobifemoral. One late thrombosis occurred in an expanded polytetrafluoroethylene graft in group 1. The five-year patency rate was 80% for group 1 and 88.9% for group 2 (P=n.s.). The overall 10-year limb salvage rate was 100%. These findings suggest that isolated femoral aneurysms are larger and more frequently symptomatic than femoral aneurysms associated with an abdominal aortic aneurysm. The association between femoral aneurysm and abdominal aortic aneurysm was found to be higher in patients with bilateral femoral aneurysms compared with those with unilateral lesions (P< 0.05). In the treatment of isolated femoral aneurysms better early results were obtained with expanded polytetrafluoroethylene interposition grafts.

Aged↗
PubMed1996

Influence of blunt needles on surgical glove perforation and safety for the surgeon.

BACKGROUND: Round-tipped blunt needle (BN) may decrease the risk of needlestick injuries and hand contamination. We prospectively determined the incidence of glove perforations in emergency abdominal procedures and the efficacy of BN in increasing the safety for surgeons. METHODS: Two hundred patients were randomized to undergo closure of the abdominal fascia using sharp needle (SN) or BN. Gloves were tested at the end of the procedure. RESULTS: Surgeons had 14 needlestick injuries and 76 perforations recorded in 69 pair of gloves. Sharp needles were responsible for all injuries and 58 (76%) perforations (P < 0.00004 and P < 0.00001, respectively). This difference was still higher when considering the perforations related to the abdominal fascia closure (BN 7% versus SN 50%; P < 0.0006). CONCLUSION: The risk of glove perforation is sevenfold greater if SN are used. Blunt needles reduce sharp injuries and improve safety for surgeons.

Accidents, Occupational↗
PubMed1995

Long-term outcome after transaxillary approach for thoracic outlet syndrome.

BACKGROUND: Recurrence or persistence of neurologic symptoms after surgical treatment of patients with thoracic outlet syndrome (TOS) are reported to be as high as 25%. To identify factors affecting the long-term outcome of surgical treatment of patients with TOS, we reviewed our 20-year experience. METHODS: One hundred thirty-four transaxillary first rib resections were performed on 118 patients (43 men, 75 women, mean age 38 +/- 13 years). Eighty-three operations (61.9%) were undertaken to relieve symptoms resulting from compression of the lower roots of the brachial plexus, 37 (27.6%) for compression of both lower and upper roots, and 14 (10.5%) for lower root and vascular symptoms. All patients underwent a transaxillary extraperiosteal first rib resection with transection of the scalene muscles. In 73 cases (54.5%) a resection of the anterior scalene muscle was also performed. A cervical rib was removed in 28 cases (20.1%), and anomalous fibrous bands adjacent to the neurovascular bundle were resected in 41 cases (30.6%). RESULTS: No major complications were observed. Of 105 patients (118 procedures) followed up (mean follow-up, 99 +/- 72 months), good to excellent results were obtained in 96 cases (81.4%) and fair to poor results were recorded in 22 cases (18.6%). The presence of a long posterior first rib stump, measured from the chest x ray films, was the strongest determinant of the long-term results among the variables examined (p < 0.0001). Reoperation, consisting of neurolysis and resection of the stump, was performed in 16 patients. The results were excellent in all cases at a mean follow-up of 66 +/- 46 months. Primary and secondary 10-year, actuarial freedom rates from recurrent symptoms were 80.9% and 93.1%, respectively. CONCLUSIONS: Our results suggest that the long-term outcome after surgery for TOS was strongly influenced by the extent of the first rib resection.

Adolescent↗
PubMed1994

Comparative long-term results of laser-assisted balloon angioplasty and atherectomy in the treatment of peripheral vascular disease.

BACKGROUND: Early results of laser-assisted balloon angioplasty (LABA) and peripheral directional atherectomy (PDA) are encouraging. The true value of these procedures has remained in doubt, however, because of the absence of data on long-term objective patency rates. PATIENTS AND METHODS: From August 1988 through October 1993, LABA and PDA were performed on 151 limbs of 124 patients. Presenting symptoms were mild-to-severe claudication in 128 limbs (63 LABA, 65 PDA) and rest pain or necrosis in 23 (7 LABA, 16 PDA). Seventy-seven percent of the atherosclerotic lesions were localized in the iliofemoral tract (77% LABA, 76% PDA). Seventy limbs were treated with LABA and 81 with PDA. RESULTS: Initial hemodynamic and arteriographic success was achieved in 46 LABA limbs (66%) and 75 PDA limbs (93%) (P < 0.002). Mean follow-up was 16 +/- 2 months after LABA and 18 +/- 1 months after PDA. During this time, 32 failures were recorded in limbs treated with LABA, and 29 in limbs treated with PDA. The patency rate at 40 months was 23% in the LABA group and 45% in the PDA group (P < 0.005). Patency rates were not affected by the length or site of the arterial lesion or the runoff score. CONCLUSIONS: PDA had a better long-term patency rate than LABA, but long-term results were dismal with both techniques. PDA appears to have a limited role and LABA no role in the treatment of lower extremity occlusive disease.

Adult↗
PubMed1992

Comparative results of carotid-subclavian bypass and axillo-axillary bypass in patients with symptomatic subclavian disease.

The results of 26 carotid-subclavian bypass (CSB) and 17 axillo-axillary bypass (AAB) procedures, performed to treat symptomatic lesions of the proximal subclavian artery, were reviewed. Nine graft failures (seven CSB and two AAB) occurred (mean follow-up: CSB = 60.5 +/- 41 months; AAB = 67.8 +/- 48 months). All CSB graft thromboses were observed in patients with an associated ipsilateral carotid lesion, surgically treated or not (p less than 0.05). Cumulative 5- and 10-year patency rates were 78.3 and 62.9% for the CSB group and 87.9% for the AAB group (N.S.). In patients with an associated ipsilateral carotid lesion, 5- and 10-year patency rates were 66.0% and 40.8% for the CSB group and 100% for the AAB group (p less than 0.05). Both the surgical procedures were safe and effective with excellent results in terms of operative mortality, major morbidity and long-term patency. CSB is the procedure of choice for the treatment of proximal subclavian artery disease for its physiological characteristics and for graft shortness. However AAB must be considered a suitable alternative and preferred when a concomitant ipsilateral carotid lesion is present. Recurrence of carotid stenosis or carotid lesion progression may cause the carotid-subclavian failure.

Aged↗
PubMed1991

Leiomyosarcoma of the inferior vena cava: analysis and search of world literature on 141 patients and report of three new cases.

Leiomyosarcoma of the inferior vena cava is a rare and potentially curable tumor. Uncertainty about the results of treatment derives from lack of a large series in the same center and of a long-term follow-up of the published cases. A review of the world literature from 1871 to 1989 allowed us to collect information on 141 patients with inferior vena cava leiomyosarcoma to which our three cases have to be added. The tumor arose from the lower segment of the inferior vena cava (infrarenal portion) in 49 patients, from the middle segment (from the renal veins to the hepatic veins) in 59, and from the upper segment (from the hepatic veins to the right atrium) in 34 patients. Complete clinical, pathologic, and therapeutic data and up-to-date follow-up have been obtained through personal correspondence with several authors. All data have been examined with both univariate and multivariate analyses as predictive factors for outcome. Variables, associated with an increased risk of death from disease, included the involvement of inferior vena cava upper segment and a high-grade tumor. Patients who underwent a radical resection of the tumor (82 patients, 56.9%) had a significantly better survival (27.9% and 14.2%, 5- and 10-year survival rates, respectively). Of these patients, those with tumor of the inferior vena cava middle segment fared better than those with lower segment tumor (5- and 10-year survival rates were 48.3% and 34.4%, respectively, for middle segment tumor and 9.3% and 0.0% for lower segment tumor). Variables associated with a good outcome and longer survival were the presence of abdominal pain and the absence of a palpable abdominal mass. Despite the high rate of recurrence (52.4% of patients undergoing radical operation; median time, 25 months), radical resection of inferior vena cava leiomyosarcoma is the only chance for a long-term cure. An earlier and more accurate preoperative diagnosis, by means of modern diagnostic techniques (echography, CT scanning, magnetic resonance imaging) will allow a higher rate of radical resection to be performed with an increase in patient survival.

Adult↗