hakan solak | University of Texas at Arlington (original) (raw)
Address: Arlington, Texas, United States
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Annals of the Royal College of Surgeons of England, 2001
A consecutive series of 349 primary lower limb amputations for vascular disease, done during 1992... more A consecutive series of 349 primary lower limb amputations for vascular disease, done during 1992-1998, were reviewed for amputation level, revision, complications and death, seeking associations with the American Society of Anesthesiology (ASA) grade and pre-operative co-morbidities of patients. Attempted revascularisation, and seniority of surgeon supervising the amputation were also examined for their possible influence on outcome. There were 312 patients (163 male) aged 39-92 years (median, 76 years). The majority of patients were ASA 3 or 4 (76%), and ASA 4 was associated with increased mortality (P < 0.01). Limiting heart problems (P < 0.01) and 'general frailty' (P < 0.001) also carried significantly higher risks of death, but limiting chest problems, dementia, and diabetes mellitus did not. There was no significant association between attempts at revascularisation at any time before amputation, and amputation level or the need for revision. There were no dif...
Cardiovascular Surgery, 2003
Background: There is some evidence that the early outcome of major amputation is worse after fail... more Background: There is some evidence that the early outcome of major amputation is worse after failed thromboembolectomy, but the risk factors and results of amputation done for acute ischaemia have never been compared with those for chronic ischaemia in a large series of patients. Method: Retrospective review of 30 day outcome for all 322 primary amputations done for arterial disease during 1992-8. There were 286 patients (163 male; median age 76 years) who had 270 amputations for chronic ischaemia and 52 for acute ischaemia. Results: The acute group had higher prevalences of cardiac disease (48% versus 29%-pϽ0.02), limiting pulmonary disease (27% versus 13%-pϽ0.02) and ASA grades 4 and 5 (27% versus 14%-pϽ0.05). Amputation below the knee was less common after acute ischaemia (31% versus 60%-pϽ0.001). There were trends towards more revisions (19% versus 11%) and higher mortality (25% versus 19%) in the acute group but neither reached statistical significance. Conclusion: Patients having major amputations for acute ischaemia have higher levels of pre-existing comorbidity than those with chronic ischaemia and are twice as likely to require amputation above the knee. They should be managed as a particularly high risk group.
The Plateau problem investigates the existence of a minimal surface spanning a given closed curve... more The Plateau problem investigates the existence of a minimal surface spanning a given closed curve. The aim of this paper is to provide a solution to the classical Plateau problem for maps from the unit disk. To do so, we construct a convergent, energy minimizing sequence of maps with the given boundary whose limit is the desired minimal surface. As an important preliminary, we introduce the theory of Sobolev spaces. The only prerequisite is basic Riemannian geometry in R3.
Annals of the Royal College of Surgeons of England, 2001
A consecutive series of 349 primary lower limb amputations for vascular disease, done during 1992... more A consecutive series of 349 primary lower limb amputations for vascular disease, done during 1992-1998, were reviewed for amputation level, revision, complications and death, seeking associations with the American Society of Anesthesiology (ASA) grade and pre-operative co-morbidities of patients. Attempted revascularisation, and seniority of surgeon supervising the amputation were also examined for their possible influence on outcome. There were 312 patients (163 male) aged 39-92 years (median, 76 years). The majority of patients were ASA 3 or 4 (76%), and ASA 4 was associated with increased mortality (P < 0.01). Limiting heart problems (P < 0.01) and 'general frailty' (P < 0.001) also carried significantly higher risks of death, but limiting chest problems, dementia, and diabetes mellitus did not. There was no significant association between attempts at revascularisation at any time before amputation, and amputation level or the need for revision. There were no dif...
Cardiovascular Surgery, 2003
Background: There is some evidence that the early outcome of major amputation is worse after fail... more Background: There is some evidence that the early outcome of major amputation is worse after failed thromboembolectomy, but the risk factors and results of amputation done for acute ischaemia have never been compared with those for chronic ischaemia in a large series of patients. Method: Retrospective review of 30 day outcome for all 322 primary amputations done for arterial disease during 1992-8. There were 286 patients (163 male; median age 76 years) who had 270 amputations for chronic ischaemia and 52 for acute ischaemia. Results: The acute group had higher prevalences of cardiac disease (48% versus 29%-pϽ0.02), limiting pulmonary disease (27% versus 13%-pϽ0.02) and ASA grades 4 and 5 (27% versus 14%-pϽ0.05). Amputation below the knee was less common after acute ischaemia (31% versus 60%-pϽ0.001). There were trends towards more revisions (19% versus 11%) and higher mortality (25% versus 19%) in the acute group but neither reached statistical significance. Conclusion: Patients having major amputations for acute ischaemia have higher levels of pre-existing comorbidity than those with chronic ischaemia and are twice as likely to require amputation above the knee. They should be managed as a particularly high risk group.
The Plateau problem investigates the existence of a minimal surface spanning a given closed curve... more The Plateau problem investigates the existence of a minimal surface spanning a given closed curve. The aim of this paper is to provide a solution to the classical Plateau problem for maps from the unit disk. To do so, we construct a convergent, energy minimizing sequence of maps with the given boundary whose limit is the desired minimal surface. As an important preliminary, we introduce the theory of Sobolev spaces. The only prerequisite is basic Riemannian geometry in R3.