Biomedical subjects
Publications and source records attributed to I Georgescu.
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Xenon passage across the erythrocyte membrane was investigated by performing several types of tests. The effects of some enzyme inhibitors (ouabain, NaF, dinitrophenol, low temperature), representing various modifications of the mentioned transport phenomenon, led to the conclusion of the existence of a strong correlation between the cellular energetic metabolism (and, hence, the energy supply for membrane processes) and the xenon accumulation into the erythrocyte. The experimental data obtained indicate that the xenon concentration in the cell water exceeds the concentration in the incubation solution by about 20%. The metabolic inhibitors practically equalise the xenon concentrations in the cell water and in the surrounding medium. The possible theoretical consequences of these facts are taken into account and analyzed.
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A complementary way for the assessment of HCC prognosis is represented by the analysis of molecular markers. Thus, immunohistochemical assessment of proliferation can describe tumor aggressiveness, probability of local recurrence or metastasis potential, being very useful for the assessment of recurrence-free survival and survival until death. The aim of our study was to assess proliferating cell nuclear antigen activity in HCC and dysplastic nodules as compared with surrounding non-neoplasic areas. Immunohistochemical techniques were thus performed on the samples obtained by ultrasound-guided liver biopsies or intraoperative biopsies, in 32 patients with HCC, as well as in 3 patients with dysplastic nodules occurring in liver cirrhosis. Expression of PCNA within extranodular areas of the HCC patients in the absence or presence of cirrhosis, was increasing from 40% to 70%, respectively. PCNA expression further increased within intranodular areas of dysplastic nodules and HCC, to 100% and 96.88%, respectively. A progressive increase of the mean values of PCNA-LI was also observed from extranodular areas without or with cirrhosis, towards intranodular areas of dysplastic nodules and HCC (4.2%, 6.8%, 27.9%, 31.9%, respectively). Dysplastic nodules can thus be considered lesions with a high-proliferation rate, representing an early stage of hepatocarcinogenesis. This supported the current recommendations for borderline hepatocellular nodules identified by ultrasound, which indicate an aggressive treatment similar to malignant lesions. In summary, we demonstrated a progressively increasing rate of cellular proliferation, from extranodular non-neoplasic areas to intranodular areas (dysplastic nodules and HCC), as reflected by an increased expression of proliferating cell nuclear antigen labelling index.
7 cases, considered as being true etiological exceptions selected from 756 upper gastrointestinal bleeding, are presented. The causes of bleeding were: pancreatic pseudocyst with intracystic hemorrhage broken into duodenum (2 cases), the nonepithelial gastroduodenal tumor (3 cases), the aneurysm of gastroduodenal artery broken into duodenum (1 case) and the aortoduodenal fistula in one patient with a bilateral aorto-iliac by-pass (1 case). The etiological diagnosis could not be established in any cases before the operations. All the cases were operated on, the operation being imposed by the severity of bleeding and having the haemostasis as a main purpose.
AIM: Selective and critical presentation of the present exploring methods concerning surgical thyroid diseases and accomplishing a pre-surgical diagnosis as accurate as possible. Depending of the diagnosis--choosing the most appropriate surgical strategy according to the newest concepts in thyroid pathology. MATERIALS AND METHOD: Clinical-statistic study, carried out retrospectively over 1,108 patients having various surgical thyroid maladies hospitalized in 1980-1999 period. There have been operated 1,058 cases. Demographic structure as regards sex, F/M was 9.07/0.93 for goiters, whereas for thyroid cancer it was 3/1. RESULTS: Nodular goiters are the most frequent (77.31%), with a pathology benign majority (91.30%). The fundamental problem is the pre-surgical establish malign lesions that require a complex therapeutic protocol comparing to benign nodules. Benign lesions 91.30%, carcinomas 5.48%, others 3.21%. All types of thyroidectomies have been made: T.ST 69.37%, T.T for benign and malign lesions 7.65% and other procedures. Thyroid specific morbidity is 4.25%, whereas unspecific is 8.69%. The 0.08% mortality (1 case), virtually null, place the result between the best of the kind. CONCLUSIONS: Pre-surgical diagnosis, as accurate as possible, based on the clinic exam using the vacuum punction with a fine needle, finally confirmed by the paraffin exam, provided the choice of an optimal surgical strategy, followed by an appropriate post-surgical protocol. Total thyroidectomy is the preferred procedure is most of the thyroid cancer forms and in benign diseases is highly recommended (multi-nodular goiters, hyperthyroid, Basedow disease, cancer).
58 (6.25%) intestinal fistulae raised after 928 operations performed for varied surgical small bowel diseases were studied. The primary operation was performed for bowel obstruction, acute peritonitis, small bowel tumours, postoperative eviscerations and for entro-mesenteric infarction. We also noticed that the surgery was performed for the small bowel diseases in 47 (81%) acses and for the diseases belonging to other abdominal viscera in the rest, having an emergency character in 81% of cases. The small bowel fistulae were single (51 cases) or multiple having the following topographic distribution: jejunal fistulae in 25 (43.4%) cases and ileal fistulae in 33 cases (56.6). The coming out of the fistulae was directly in 41 (70%) cases and trough an intermediate route in 17 (30%) cases. The onset of the fistulae was certainly pointed by the coming out moment, early only in 39.6% of cases. This underlining the importance of an active exploration of the operative wound, imposed by the general and/or local premonitory symptoms. The treatment was complex, using conservative and/or surgical procedures; 23 (39.6%) patients were operated on. The mortality rate was of 29.4%. The parenteral nutrition and the therapeutical option for the conservative methods were the main therapeutical acquisitions, which improved the results and the prognosis of the intestinal fistulae.
448 hiatal hernias, admitted in the last 20 years (1974-1998), 431 (96.3%) sliding hiatal hernias and 17 (3.8%) paraoesophageal hernias, are presented. The hiatal hernias were noticed under the well known etiopathologic circumstances: the predominance of the patients belonging to the female sex (66.07%), aged over 40 (83.25%); we also found in the natural history of the patients increasing abdominal pressure factors (10.79%), metabolic and deficiency disturbances (34.19%) or the concomitance of such a diseases, which admits a low trophicity of the connective tissue as a main pathogenic factor (35.12%). 231 (52.56%) cases were pure hiatal hernias and in 217 (48.44%) cases the hiatal hernia was associated with biliary and/or gastro-duodenal lesions, the hiatal hernia being considered as secondary. The clinical diagnosis was suggested by the gastrooesophageal reflux syndrome for the pure hiatal hernias associated with respiratory (30.32%) and/or cardiac (27.4%) signs. In the associated forms with biliary and/or gastro-duodenal lesions, the clinical picture was that of the hiatal hernia in 30.6% of cases and of the associated lesion in the rest. The clinical diagnosis was confirmed by x-ray examination in 82.7% of cases; the endoscopy was performed in 159 cases and proved the gastrooesophageal reflux and/or its consequences in 47.2% of cases. 420 (93.75%) cases were uncomplicated and in 28 (6.25%) cases we noticed one of the following complications: upper gastro-intestinal bleeding, incarceration or venous thrombosis of the hernial pouch. 336 (75%) patients were operated on, using a large scale of surgical procedures, surgical indication being established on clinical, radiological and endoscopic criteria, with utmost strictness for pure hiatal hernias (surgical treatment 68.3%) and generously for the associated forms. Both the early and late results were good: the mortality rate of 0.44% and the recurrence rate of 3.97%.
The authors present a case of recidivated upper digestive tract hemorrhage, in which the bleeding initially stopped under conservative treatment. Imagery showed a piloro-duodenal stenosis. During the preoperative care the hemorrhage is resumed abruptly imposing emergency operation. The lesion was an intraoperative surprise imposing the hemostasis at first, and then the surgical management of lesions of the digestive tract.
We present 2 cases of retroperitoneal localisation of Castleman's disease--hyalino-vascular histologic type. A 65 years old woman and a 67 years old man were admitted with the diagnosis of retroperitoneal tumour. The clinical findings were not specific. Surgical removal of the tumour is the treatment of choice. Focal recurrences didn't occur.
Between 1991-2001, 40 patients underwent esophagectomy without thoracotomy for: caustic esophageal stenosis (26 cases), cervical esophageal cancer (1), lower esophageal cancer (7), and acute post-caustic oesophagitis (2). Thirty-four patients underwent transhiatal esophagectomy, 3 patients had an esophagectomy by "stripping" and in 3 other patients a combination of stripping and transhiatal esophagectomy. Postoperative complications included: injuries of the laryngeal recurrent nerve (2), pulmonary complications (13), anastomotic leakage (5). Two patients died in the postoperative period one from a myocardial infarction and the other from an acute myocardial dilatation. Trans-hiatal esophagectomy can be considered as a viable alternative to transthoracic esophagectomy in the management of the benign and malignant diseases of the esophagus. Transhiatal esophagectomy is a safe method of resection because of its reported lower morbidity and mortality and similar survival rates compared to transthoracic esophagectomy.
Preoperative treatment of the peripheral venous pathology in patients with indication for total knee arthroplasty (TKA) would reduce the risk of postoperative deep venous thrombosis (DVT). Between 1997 and 2004, 110 patients were evaluated for TKA. 35 had also varicose veins in the lower limbs. 4 patients were excluded because of absolute contraindications for surgery. 31 patients presented varicose disease, in different stages according with CEAP. The patients were treated surgically (Babcock or Muller technique), phlebotomy drugs and mechanical contention. In a single case the TKA was done without any preoperative treatment of the varicosities. TKA was done after 8-12 weeks. DVT prophylactic measures were undertaken in all 95 cases. Results were good except 2 cases of DVT and 1 case or pulmonary embolism in patients with preoperative treatment of the venous disease. The patient with no preoperative treatment of its varicose veins developed DVT with chronic, persistent oedema. Preoperative treatment of the varicose veins in the lower limb is mandatory for a successful TKA.
To establish the optimal diagnosis and therapeutical strategy in severe acute pancreatitis. 94 (56.9%) severe acute pancreatitis (79 males and 15 females, aged between 26 and 81), selected from 165 acute pancreatitis admitted in the last 5 years (2000-2004) were analyzed. The disease was assigned as severe when one or more of the following criteria were present: Ranson score >3 on admission or at 48 hours, APACHE II score >8, visceral failures, Balthazar CT score C, D or E and local complications (infected necrosis, pseudocyst or pancreatic abscess). Medical treatment (aggressive supportive intensive care therapy, minimizing pancreatic secretion and antibiotic therapy) was the first therapeutical step in all cases. 49 (52.1%) patients were operated on: 20 as early surgery imposed by biliary sepsis (16 cases) or by an acute abdomen with uncertain etiology and unfavourable evolution, and 22 as late surgery (at least 12 days after onset), imposed by the presence of the infected pancreatic necrosis, visceral failures or other local complications, the necrosectomy being the main surgical procedure for infected necrosis. 77 (81.9%) cases had a fair evolution. The conservative treatment led to a complete recovery in 37 (37.2%) cases. We registered an overall mortality rate of 12.7% and postoperative mortality rate of 14%; we also registered 5 (10.2%) postoperative complications: 4 pancreatic and 1 colonic fistulae. (1) The treatment of the severe acute pancreatitis must be performed only in the specialized multidisciplinary well equipped centers with very well trained staff. (2) Medical conservative treatment (aggressive supportive intensive care therapy and antibiotic therapy) is the main therapeutical method within the acute phase (first two weeks). (3) Very restrictive surgical indications within the acute phase. (4) Necrosectomy is the main surgical procedure for the infected necrosis.
Our study upon 1235 cases of duodenal ulcers (1991 - 2001) revealed a decrease of its morbidity rate of 10 - 12%. However, the incidence of the post-bulbar duodenal ulcer (P.B.D.U.) remained constant - 9,33% (115 cases) from all duodenal ulcers. Its diagnostic and therapeutic difficulties, its peculiar etiology, pathogeny, topography and evolution are the consequence of the duodeno-bilio-pancreatic morphologic modifications, clinic polymorphism, radiologic indirect signs and difficult endoscopic localisation. Definitive diagnosis was set only intraoperatively. There are 2 forms of P.B.D.U.: proximal (D1 fixed) - 62,60% and distal (D2 above duodenal papilla) - 37,40%. Associated bilio-digestive lesions were encountered in 30 cases (26,08%). Due to its aggressive, endocrine-type etiology and pathogeny, evolution to severe complications and resistance to modern medical therapy, the PBDU should be of first surgical intent, considering a radical procedure whenever possible. Gastric 2/3 resection or truncal vagotomy with limited gastric resection were achieved in 90,43% of cases. We preferred the Bilroth II type anastomosis (65,20%) excluding the ulcerous lesion. Drainage of the duodenal stump was employed in 26% of cases. Specific postoperative morbidity of 12,17%, an early re-operations rate of 6,05% and postoperative mortality of 3,47% versus 2,05% for the duodenal ulcers, emphasize the severity of the P.B.D.U.
AIM: To point out the severity of the postoperative biliary peritonitis (PBP) and to established the most proper ways of diagnosis and treatment. MATERIAL AND METHODS: 14 PBP (6 males and 8 females, age between 42 and 76 years) admitted in the last 14 years were analyzed. The PBP occurred after biliary surgery in 13 cases and after gastro-duodenal surgery in 1 case. The delay between the first operation and the establishing of the diagnosis and reoperation varied between 24 hours and more than 3 days. All the patients were operated on; the operation had to fulfill 2 main objectives: the treatment of the peritonitis and to solve the biliary lesions. RESULTS: 6 patients had a fair evolution. We registered 8 complications with a morbidity rate of 57,14% and 2 deaths with a mortality rate of 14,3%. CONCLUSIONS: 1. Postoperative biliary peritonitis is one of the most severe complications of the biliary and gastro-duodenal surgery, due to preoperative unrecognized biliary lesions or occurring as postoperative accidents or complications. 2. The clinical picture, deeply modified by the complex postoperative treatment makes the early diagnosis very difficult and leads to a delay of the re-operation. 3. The treatment is exclusively a surgical one, with two main objectives: the biliary lesion repair and the treatment of the peritonitis. 4. The postoperative biliary peritonitis are charged by a high postoperative morbidity and mortality rate, the delay of the diagnosis and the time of reoperation being the main risk factor.
AIM: the assessment of the therapeutical methods in the pancreatic pseudocyst occurred after severe acute pancreatitis. MATERIAL AND METHOD: 30 (33.3%) pancreatic pseudocysts (18 men and 12 women aged between 28-64) occurred in the evolution of 90 severe acute pancreatitis in the last 5 years (2000-2004) were analyzed. The diagnosis was established on the clinical and imaging aspects on average 1 month after the onset of the severe acute pancreatitis. The treatment was different, depending on size, anatomo-clinical form, pseudocyst age, presence of complications and the biological status of the patient. 14 uncomplicated pseudocysts, with the diameter less than 6 cm, were treated conservatively, until their complete resorption. 6 cases were operated on (2 cysto-gastrostomy, 1 cysto-jejunostomy and 3 external drainage). We performed percutaneous external CT guided drainage in 2 cases and endoscopic drainage in other 8 cases (trans-papillary-trans-ductal drainage 3 cases and endoscopic US guided drainage in 5 cases: transgastric 2, transduodenal 2 and transesophageal 1). RESULTS: 28 (93.3%) cases had a fair evolution (complete resorption in 14 uncomplicated pseudocysts after 3-6 weeks of conservative treatment). We registered 2 gastro-duodenal bleeding during endoscopic US guided drainage, which required operation (haemostasis cysto-gastrostomy). Mortality rate was 0. CONCLUSIONS: 1. The pseudocyst is the main late complication of the severe acute pancreatitis (33.3% in our study). 2. The uncomplicated pseudocysts with the diameter less than 6 cm, benefit of the conservative treatment and monitoring in progress until their complete resolution. 3. There are 3 therapeutical methods for the pseudocysts more than 6 cm in diameter and/or complicated: the percutaneous external US/CT guided drainage, the endoscopic drainage and surgery. 4. The option for the drainage procedure must take into account the morphological and evolutionary aspects of the pseudocyst, the age and biological status of the patient.