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Biomedical subjects

M K Lazarides

Publications and source records attributed to M K Lazarides.

At least 19 recordsLinked to original sources

Inferior epigastric artery false aneurysms: review of the literature and case report.

A case report is presented of a IEA false aneurysm successfully embolized in a 50-year old man following a blunt abdominal injury. A literature review revealed another 15 cases. Most cases were iatrogenic (13/16) complicating abdominal wall procedures. Treatment options included open surgery (8 cases), percutaneous coil embolization (6), ultrasound guided thrombin injection or ultrasound guided compression (2). The selected treatment (surgical or non-surgical) was not affected by the size of the aneurysm (p=0.6) and was successful in all patients. However two of the non-surgically removed lesions (25%) remained unchanged in size for a long time causing discomfort. IEA false aneurysms represent an uncommon entity. Open surgery for IEA false aneurysms is easy and cheap. Endovascular approaches can lead to a long delay in resolution of the problem.

Abdominal Injuries↗

Diagnostic criteria and treatment of Buerger's disease: a review.

Buerger's disease is an inflammatory occlusive disorder affecting the small and medium-size arteries and veins of young, predominantly male, smokers. The disorder has been identified as an autoimmune response triggered when nicotine is present. Tobacco abuse is the major contributing risk factor; however, smoking seems to be a synergistic factor rather than the cause of the disease. The traditional diagnosis of Buerger's disease is based on 5 criteria (smoking history, onset before the age of 50 years, infrapopliteal arterial occlusive disease, either upper limb involvement or phlebitis migrans, and absence of atherosclerotic risk factors other than smoking). As there is no specific diagnostic test and an absence of positive serologic markers, confident clinical diagnosis should be made only when all these 5 criteria have been fulfilled although not universally accepted. The angiographic findings in Buerger's disease ("corkscrew," "spider legs," or "tree roots") are helpful but not pathognomonic. A wide spectrum of medical or surgical therapeutic options have been proposed; however, total abstinence from tobacco use remains the only means of stopping the disease progression. The initial management of patients with Buerger's disease should be conservative. Because several arteries may be unaffected, claudicants should be encouraged to walk, whereas patients with "critical" ischemia should be admitted for bed rest in the hospital. Bypass grafting is seldom an option, as the location of the lesions distally leaves little to bypass because of lack of target vessels. A literature review revealed only a few series reporting vascular reconstruction (mainly femorodistal bypasses) in Buerger's disease. Bypass patency rates were suboptimal; however, the corresponding limb salvage rates were satisfactory. A possible explanation is that patent grafts, even over a short period of time, are sufficient to allow healing of ulcers in patients with Buerger's disease.

Age of Onset↗

Gelatinases [matrix metalloproteinase-2 (MMP-2) and MMP-9] induce carotid plaque instability but their systemic levels are not predictive of local events.

Matrix metalloproteinases (MMPs) appear to play a central role in atherosclerotic plaque remodeling; however, the relationship of increased MMP levels in inducing carotid plaque instability remains controversial. We investigated whether gelatinases (MMP-2 and MMP-9) are implicated in carotid intraplaque hemorrhage and whether their serum levels may predict local carotid events. Nineteen carotid specimens obtained by endarterectomy of 18 patients were studied. The presence of gross intraplaque hemorrhage was recorded before plaque removal and quantification of MMP-2, MMP-9, and tissue inhibitor of metalloproteinase-1 (TIMP-1) in extracts from (1) the more stenotic area of the plaque, (2) the periphery of the plaque, and (3) serum was performed by enzyme-linked immunosorbent assay. MMP-9 levels measured in extracts from the most stenotic area were significantly higher in patients with intraplaque hemorrhage (p = 0.007); however, serum levels showed no difference, while those taken from the periphery of the lesion were also increased but did not reach a statistically significant level (p = 0.06). An increase in MMP-2 values was observed in the periphery of the lesion (p = 0.04) in patients with intraplaque hemorrhage. TIMP-1 levels showed no difference between the two groups regardless of the presence or absence of intraplaque hemorrhage. No significant differences in MMP levels were observed between symptomatic and asymptomatic patients. Increased levels of MMPs, particularly MMP-9, have been implicated in carotid intraplaque hemorrhage without their serum levels being predictive of local events.

Aged↗

The significance of medial sural artery integrity in popliteal artery trauma: a case report.

Two patients with popliteal artery trauma who underwent secondary amputations due to refractory calf sepsis despite a patent arterial repair are presented in this case report. The medial sural artery, the main arterial supply of the medial head of the gastrocnemius, was surgically severed in both patients owing to the use of a continuous medial incision from the supra level to infragenicular level. The compromised arterial supply of the medial head of the gastrocnemius muscle may have contributed to the devitalization of the muscle and the subsequent calf sepsis, and it is speculated that this was related to the unfavorable outcome.

Adult↗

Vascular surgery training in Greece.

The aim of the study was to describe current training in vascular surgery in Greece. The method used was the presentation of data obtained by direct contact with the units. Vascular surgery has been a mono-specialty in Greece since 1989. The duration of training is 7 years (3 years common trunk in general surgery, 3 years in vascular surgery and 1 year in cardiothoracic surgery). However, its duration often exceeds 11 years due to lost time in waiting to start training. The latter happens because there has been a tremendous increase of the number of medical graduates during the last decade and thus the number of trainees has increased disproportionately to the demand for vascular surgeons nationwide. Greece has the second higher ratio of vascular trainees per million population in EU (3.6 trainees/million population). There are 14 accredited centres for training in vascular surgery, the majority of them being in Athens (9/14). In these centres there are a total of 52 trainers and 38 trainees (ratio 1.4/1). An average of 380 operations are performed per centre/year and 140 operations/trainee/year. In conclusion, there is a need for re-defining the training programme in vascular surgery in Greece. The main concern is the tremendous increase in medical graduates leading to a discrepancy between accredited training posts and fellows waiting to fill them.

Greece↗

Femoral-anterior tibial reconstructions using cuffed PTFE grafts: routing alternatives.

BACKGROUND: The anterior tibial is the less often used artery for distal anastomosis in infrapopliteal bypass with synthetic grafts; however, several investigators argue against even an attempt to use non-autologous material for such distal reconstructions. Only few studies report patency rates mixing-up popliteal below-knee and various crural bypasses. PATIENTS AND METHODS: Nineteen consecutive femoral-anterior tibial cuffed PTFE bypass grafts, either via the lateral (n = 15) or interosseous (n = 4) route, were inserted in a 10-years period. RESULTS: The 1-year and 2-year primary patency rate was 71% and 53%, respectively. It is noteworthy that in one patient a graft positioned via the lateral route remained patient for ten years. No complications were observed regarding the routing methods, whatever increased operating time was required in the interosseous route cases. The 3-year cumulative survival rate for this particular group of patients was 32%. CONCLUSIONS: Our data indicate that femoral-anterior tibial bypasses using cuffed PTFE grafts via the lateral route result in an acceptable medium-term patency. As such patients have a limited life expectancy, these procedures should be performed when an autologous vein is not available, as opposed to primary amputation.

Aged↗

Early disruption of proximal anastomosis of a PTFE axillofemoral bypass graft.

Exertional disruption of axillary anastomosis is a well documented, although rare, complication of axillo-femoral grafts. Comprehension of causative mechanisms is of great importance, so that precautions can be taken against it. Here, a case of an early disruption of proximal anastomosis of an axillofemoral graft is reported. Use of crutches was incriminated as the responsible mechanism.

Anastomosis, Surgical↗

Removal of knotted intravascular devices. Case report and review of the literature.

OBJECTIVE: to review published reports on knotted intravascular devices/catheters. METHOD: report of two cases and systematic review of the literature. RESULTS: a total of 113 reported cases of knotted intravascular devices/catheters were located. Pulmonary artery catheters (Swan-Ganz) were responsible for more than two thirds of the total reported intravascular knots. In 62% (70/113) of the cases withdrawal of the knotted catheters was achieved successfully with different interventional radiological techniques, avoiding the need for surgical exploration. In 32% (36/113) of the patients surgical removal was favoured. Capture with one of the interventional techniques and pulling down the knot into an easily accessible vein to be removed through an open venotomy, was the most common surgical procedure. However, in five cases, an open cardiotomy was required. In seven cases the patient's condition was critical and precluded any surgical procedure, so the knotted catheter was left in situ. The mortality of this event was 8% (9/113). CONCLUSIONS: interventional radiological techniques have largely replaced open surgical removal. Knotted catheters may need to be surgically removed when (a) the knot is large in size with many loops, or (b) intracardiac fixing of the knot is encountered.

Aged↗

Influence of surgeons' specialty on the selection of vascular access for hemodialysis treatment.

BACKGROUND/AIMS: Various patient-related factors could not explain the variability of access types across facilities in the published literature. The aim of this study was to investigate the influence of surgeons' specialty on access type selection for hemodialysis treatment. METHODS: The directors (nephrologists) of all renal units in Greece (n = 92) were surveyed by a closed questionnaire. RESULTS: The response rate was 75%. There was no statistically significant difference in the percentage of patients predominantly with autologous arteriovenous fistulae between units where only vascular surgeons were performing access surgery and those where either general surgeons or transplant surgeons were operating (mean value in all renal units 80.8%, range 43-97%). However, the difference between the three groups of renal units regarding their surgeons' ability to create complex access procedures and to correct complications (as an index of surgeons' skill) was statistically significant (p < 0.001). CONCLUSION: The general surgeons of the new generation are not often using vascular surgical techniques and may have less opportunities to develop expertise in vascular access creation.

Arteriovenous Shunt, Surgical↗

AV fistulae.

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Animals↗

Patency of autologous and prosthetic arteriovenous fistulas in elderly patients.

OBJECTIVE: To compare the patency of autologous and graft-bridging (prosthetic) arteriovenous (AV) fistulas in patients 70 years of age or more. DESIGN: Non-randomised comparative study. SETTING: University hospital, Greece. PATIENTS: 114 patients aged 70 years or more (mean 78) who required 135 consecutive angioaccess procedures during the 8-year period January 1990-December 1997. INTERVENTIONS: 68 autologous and 67 prosthetic procedures, 64 of the prosthetic procedures being proximal brachioaxillary AV arm grafts. MAIN OUTCOME MEASURES: Primary and secondary cumulative patency rates and cumulative survival. RESULTS: Life table analysis showed that the 3-year secondary patency (medium term patency) was significantly superior in the prosthetic group (58% compared with 44%, p = 0.04). Cumulative survival at 3-years was 21%. CONCLUSIONS: A proximal brachioaxillary prosthetic AV graft is a good alternative as initial primary access in elderly patients who are not suitable for an autologous proximal AV fistula. At this age long term patency and conservation of proximal access sites are of minimum importance because of their limited life expectancy.

Aged↗

Indications for surgical treatment of angioaccess-induced arterial "steal".

BACKGROUND: Arterial "steal" is a well-known complication following proximal arteriovenous (AV) fistula, but its manifestations comprise a wide spectrum of symptoms and there are no clear indications for those patients who need surgical repair. STUDY DESIGN: Among 180 consecutive AV fistulas of various configurations, with the brachial artery as the donor artery in all patients, 111 patients were studied retrospectively (group A) and 69 patients were studied prospectively (group B). Patient records were reviewed in group A, and the decision for surgical correction of limb-threatening steal was based on clinical grounds only. In group B, all patients were followed prospectively; postoperative systolic blood pressure measurements were obtained, and a systolic pressure index (SPI) was calculated (postoperative forearm systolic pressure divided by contralateral forearm systolic pressure). In patients with an SPI < 0.6, nerve conduction studies (NCS) were performed. The decision for operation in this group was based on clinical examination, SPI, and NCS. RESULTS: Seven patients were operated on for steal-induced limb-threatening ischemia; in all seven patients, ischemia developed immediately after access construction. One additional patient with mild symptoms and deterioration in repeated NCS was considered a candidate for ischemic monomelic neuropathy and was successfully operated on 1 month later. The ligation-bypass technique was used in all patients, consisting of arterial ligature distal to the takeoff of the graft and short arterial bypass from a point proximal to the inflow of the access to a point just distal to ligation. In 94% of the patients, some degree of distal ischemia was detected (SPI < 0.8); patients with SPI < 0.5 were most likely to have impaired NCS. CONCLUSIONS: Steal-induced limb-threatening ischemia necessitating immediate surgical repair occurred in 3.9% (7 of 180) of our patients. The decision for surgical correction of steal should be based on clinical examination. Nerve conduction studies may be useful in patients who have an SPI value < 0.5 to detect candidates who might develop ischemic monomelic neuropathy. In similar patients, surgical treatment of steal should be offered.

Arm↗

Incidence and patterns of iatrogenic arterial injuries. A decade's experience.

OBJECTIVE: To investigate the incidence and patterns of all iatrogenic arterial injuries (IAI) necessitating surgical repair in a ten-year period. DESIGN: Retrospective study. SETTING: Departments of Vascular Surgery a) Athens General Hospital "G. Gennimatas" and b) Red Cross Hospital of Athens, Greece. PATIENTS: Eighty-seven patients underwent surgical repair of an IAI, comprising 36% of the 237 patients treated surgically for various arterial injuries during the same period. RESULTS: Specific injury patterns were implicated in most cases. Cardiac catheterizations were the commonest cause of IAI (n=39). The second commonest source for IAI was the renal units' personnel accountable for 17 false aneurysms, which arose at arteriovenous grafts' puncture sites. Among the surgical specialties orthopaedic surgery was the most common source of IAI (n=13). A less common pattern of IAI was following radical operations for cancer (n=7). The mortality of the series was 4.6% (4/87) and the amputation rate 2.3% (2/87). No death or amputation was associated with IAI following cardiac catheterizations confirming that post-catheterization IAI have a benign prognosis. False aneurysm was the most frequent complication when the cardiac catheterization was via the femoral artery, when the catheterization was via the brachial artery the commonest complication was arterial thrombosis. The two amputations were due to delayed reconstruction of arterial injuries that were not recognised at first sight. CONCLUSION: Common patterns characterize most IAI. Understanding their exact causes is a first step towards prevention or timely repair if the latter is not feasible.

Adult↗

POSSUM and APACHE II scores do not predict the outcome of ruptured infrarenal aortic aneurysms.

Forty consecutive patients were admitted alive to the operating theater with ruptured infrarenal aoritc aneurysms in a 3-year period and were assessed preoperatively with two scoring systems: the POSSUM (physiological and operative severity score for the enumeration of mortality) and the APACHE II (acute physiologic and chronic health evaluation). The aim of the study was to investigate the capacity of the two scores to predict the patients' outcome. The operative mortality of the series was 55% (22/40). The average POSSUM score was 63.3 for survivors and 66.5 for the nonsurvivors (difference not statistically significant). APACHE II score averaged 11.3 in survivors and 14.5 in nonsurvivors (p = 0.02). APACHE II score 17 was the threshold value with the highest combined specificity and sensitivity; however, at this point the positive predictive value for a death was 92% and the negative predictive value was 63%. Interestingly, the only single factor in univariate analysis affecting mortality was the preoperative platelet count and is not taken into account in neither of the two scoring systems. POSSUM failed in predicting the outcome of ruptured infrarenal aortic aneurysms. APACHE II was a good predictor of outcome; however, its power to predict the outcome in any given individual patient was limited. As precise prediction is impossible, repair in every patient should not be denied.

APACHE↗