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Biomedical subjects

M L Gliedman

Publications and source records attributed to M L Gliedman.

At least 19 recordsLinked to original sources
PubMed2001

Lethality of standard total parenteral nutrition following major liver resection in rats is prevented by high arginine and high branched chain amino acids but not by glutamine.

Standard total parenteral nutrition (TPN), with or without fat, in amounts approximating the ad libitum intake of normal rats is highly lethal for rats following 70% hepatectomy. Because of significant metabolic changes including alterations of branched chain amino acids (BCAA), arginine (ARG), and glutamine (GLN) associated with serious injury, sepsis, and liver dysfunction, we hypothesized that (1) increasing concentrations of BCAA and ARG in TPN and (2) including glutamine in the TPN may diminish the lethality. Male Sprague-Dawley rats with 70% hepatectomy and jugular vein catheterization were divided into groups. Two sets of experiments were conducted. In Experiment 1, the effects of varying concentrations of BCAA and ARG in the TPN infusate, singly and together, were assessed: Group 1, Standard TPN (19% BCAA, 4.8 g ARG/L); Group II, High BCAA TPN (35% BCAA, 4.8 g ARG/L); Group III, High ARG TPN (19% BCAA, 9.6 g ARG/L); Group IV, High ARG, High BCAA TPN (35% BCAA, 9.6 g ARG/L; Group V, chow and tap water ad libitum. In experiment 2, the effect of 2% GLN in TPN was evaluated: Group A, Standard TPN and Group B, 2% GLN TPN. All infusates were isocaloric (216 Kcal/Kg/d) and isonitrogenous (1.94 g N/Kg/d) delivered at half concentration on postoperative day 1, 3/4 concentration on postoperative day 2, and at full concentration thereafter. Experiment 1: Thirty-three to 36% of rats in Groups I (Standard TPN) (4/11), II (High BCAA TPN) (4/11) and III (High ARG TPN) (4/12) died within 6 days. In sharp contrast, none died in Groups IV (High BCAA, High ARG TPN) and V (rat chow and tap water) (P < 0.05 in each comparison). Among rats in the 4 TPN groups surviving 7 days, there were no significant differences in body weight change (minus 3-4%), spleen or lung weight, extent of liver regeneration (61-66%). Serum total protein and albumin were significantly higher in Group V (chow-fed) (similar to values in normal rats) than in Groups I-IV, P < 0.05 in each case. Serum total bilirubin was significantly higher in Group I than in normals and in Groups II, III, and V. Serum lactate dehydrogenase levels were similar in normals and all 5 groups. Serum aspartate amino transferase level was higher in Group I than in normals but not significantly different from those groups II-V; the latter were similar to normals. Experiment 2: Thirty percent of rats in Groups A (Standard TPN) (3/10) and B (GLN TPN) (3/10) died within 6 days. Among rats surviving for 7 days, body weight change (minus 3-5%), liver regeneration (67-70%), and liver tests were similar in both groups. TPN modified to contain high concentrations of both BCAA and ARG (but not of either alone) prevented the high frequency of lethality induced by standard TPN in rats with 70% hepatectomy. No such salutary effect was shown by modifying the TPN to contain 2% GLN. The striking benefit observed when TPN containing high BCAA and high ARG was infused may be due to the high BCAA leading toward normalization of serum amino acid levels, reducing proteolysis, increasing protein synthesis, and accelerating early liver regeneration, combined with the high ARG likely reducing serum ammonia and leading to increased host defense, and perhaps, thereby, preventing bacterial translocation and bacteremia.

Amino Acids, Branched-Chain↗
PubMed1997

Contrasting effects of identical nutrients given parenterally or enterally after 70% hepatectomy: bacterial translocation.

High mortality occurs in rats with 70% hepatectomy fed intravenous (IV) total parenteral nutrition (TPN; 13.9% glucose, 4.17% amino acids, 1.46% fat, electrolytes, trace minerals, and vitamins providing 216 kcal.kg-1.d-1) but not when the identical nutrients are given at the same rate enterally (gastrostomy). We hypothesized that a difference in bacterial translocation (BT) was a contributing factor to this phenomenon. Forty-five male Sprague-Dawley rats (300-360 g) were divided into five groups and underwent the following: control (no operation), sham (intraperitoneal [IP] pentobarbital anesthesia, central venous and gastrostomy catheters, laparotomy, sham hepatectomy), standard oral feeding (SOF), TPN (IV nutrients), and total enteral nutrition (TEN; gastrostomy). The SOF, TPN, and TEN groups had IP pentobarbital anesthesia, central venous and gastrostomy catheters, and 70% hepatectomy. Postoperatively, control and SOF (both catheters plugged) rats ate a commercial rat chow and drank tap water ad libitum pre- and postoperatively. The sham, TPN, and TEN groups were given the identical infusate composition as above, but the nutrient concentrations were cut in half (110 kcal/kg) and three-quarters (165 kcal/kg) on postoperative days 1 and 2, respectively. At the end of postoperative day 2, all rats were euthanized. BT to mesenteric lymph nodes (MLNs), liver, spleen, and lungs was significantly higher in the TPN rats compared with all other groups, except that BT to the MLNs was similar in the TPN and TEN groups. Bacteremia was found only in the TPN rats. BT in TPN rats with 70% hepatectomy was significantly greater 48 h after operation than in those fed the identical nutrients enterally at the same rate; this correlates with the previously reported significantly greater mortality in rats with 70% hepatectomy receiving TPN.

Animals↗
PubMed1994

Contrasting effects of identical nutrients given parenterally or enterally after 70% hepatectomy.

Based on clinical observations, we hypothesized that prolonged parenteral nutrition (in contrast to enteral nutrition) is detrimental after major hepatic resection. Male Sprague-Dawley rats (300 to 380 g) anesthetized with intraperitoneal sodium pentobarbital had 70% hepatic resection and jugular vein and gastrostomy catheterizations using aseptic techniques and were divided randomly into three groups: (1) total parenteral nutrition (TPN) (nutrients via central vein), (2) total enteral nutrition (TEN) (identical nutrients via gastrostomy), and (3) standard oral feeding (SOF) (chow and water ad libitum). Unused catheters were plugged. In the first set of experiments (n = 42), nutrient intake was formulated to approximate the nutritional intake of normal rats, 216 kcal/kg/d. Infusate was 15% glucose, 4.5% amino acids, electrolytes, trace minerals, vitamins, and 20% fat emulsion given half-strength the first day, three-fourths strength the second day, and full strength thereafter. On postoperative day 7, surviving rats were killed. Mortality prior to day 7 was very high (68%) in the TPN group and low in the TEN (9%) and SOF (9%) groups (p < 0.005). Among survivors, the serum albumin level was lowest (p < 0.002) and serum bilirubin level (p < 0.025) and wet weight of regenerated liver (p < 0.002) highest in the TPN group. However, the livers in TPN rats appeared pale and were found to be abnormal histologically with markedly diminished glycogen and amphophylic hepatocyte cytoplasm, and their spleens were enlarged (by a factor of two). The high mortality of TPN rats was seen whether the fat emulsion was given as a bolus daily, continuously as part of the infusate, or not included as part of the TPN regimen. In the next series (n = 70), nutrient concentrations, volumes, and rates of infusion were varied. There was a high correlation between caloric (r2 = 0.831, p < 0.0006), glucose (r2 = 0.598, p < 0.02), and amino acid (r2 = 0.619, p < 0.03) intakes and mortality in the TPN group: at 140 kcal/kg/d, none died; at 178 kcal/kg/d, 50% to 62% died; and at 230 kcal/kg/d, 80% died. No TEN rat died. In conclusion, 70% hepatectomized rats fed enterally with nutrients approximating the intake of normal rats do well and survive. In sharp contrast, mortality is very high when identical nutrients are infused parenterally. By reducing the levels of nutrients given parenterally, survival improves significantly.

Animals↗
PubMed1994

Laparoscopic unroofing of multiple benign liver cysts with intraperitoneal drainage: a case report.

The treatment of symptomatic congenital hepatic cysts is surgical. Aspiration does not provide definitive therapy and carries a high recurrence rate. Surgical exploration and drainage intraperitoneally, externally, and internally to a segment of bowel have been described. With the recent explosion in the applications of laparoscopic guided surgery, we report a simple method for the excision of congenital solid hepatic cyst with subsequent intraperitoneal drainage and follow-up.

Cysts↗
PubMed1990

Changing arteriosclerotic disease patterns and management strategies in lower-limb-threatening ischemia.

From January 1, 1974 to December 31, 1989, we treated 2829 patients with critical lower-extremity ischemia. In the last 5 years, 13% of patients had therapeutically significant stenoses or occlusions above and below the groin, while 35% had them at two or three levels below the inguinal ligament. Unobstructed arterial flow to the distal half of the thigh was present in 26% of patients, and 16% had unobstructed flow to the upper third of the leg with occlusions of all three leg arteries distal to this point and reconstitution of some patent named artery in the lower leg or foot. In the last 2 years, 99% of all patients with a threatened limb and without severe organic mental syndrome or midfoot gangrene were amenable to revascularization by percutaneous transluminal angioplasty (PTA), arterial bypass, or a combination of the two, although some distal arteries used for bypass insertion were heavily diseased or isolated segments without an intact plantar arch. Limb salvage was achieved and maintained in more than 90% of recent patient cohorts, with a mean procedural mortality rate of 3.3%. Recent strategies that contributed to these results include (1) distal origin short vein grafts from the below-knee popliteal or tibial arteries to an ankle or foot artery (291 cases); (2) combined PTA and bypass (245 cases); (3) more distal PTA of popliteal and tibial artery stenoses (233 cases); (4) use of in situ or ectopic reversed autogenous vein for infrapopliteal bypasses, even when vein diameter was 3 to 4 mm; (5) composite-sequential femoropopliteal-distal (PTFE/vein) bypasses; (6) reintervention when a procedure thrombosed (637 cases) or was threatened by a hemodynamically significant inflow, outflow, or graft lesion (failing graft, 252 cases); (7) frequent follow-up to detect threatening lesions before graft thrombosis occurred and to permit correction of lesions by PTA (58%) or simple reoperation; and (8) unusual approaches to all infrainguinal arteries to facilitate secondary operations, despite scarring and infection. Primary major amputation rates decreased from 41% to 5% and total amputation rates decreased from 49% to 14%. Aggressive policies to save threatened limbs thus are supported.

Amputation, Surgical↗
PubMed1988

Cost factors in limb-threatening ischaemia due to infrainguinal arteriosclerosis.

Cost factors are an increasingly important aspect of medical care. In the United States, more than 150,000 patients per year have limb-threatening ischaemia due to infrainguinal atherosclerosis. We studied the economic impact of this disease process and its treatment in 313 consecutive patients seen at our hospital between 1979 and 1981. Minimum follow-up was 3 years. Seventy-nine percent of our patients undergoing revascularisation attempts had limb salvage with full function at 1 year and 60% had full function at 3 years. Of the patients who died, 85% died with their limbs intact. The mean patient cost for all 289 arterial reconstructions was $26,194 +/- $876 S.E. ($23,026 +/- $1117 for 166 femoropopliteal bypasses; $30,380 +/- $1349 for 123 distal bypasses). The mean length of stay (LOS) for the reconstruction group was 50 days. In this patient population, the following adverse risk factors were present: Gangrene or necrosis in the foot (72%), age more than 70 (56%), and previous vascular surgery (21%). A significantly higher cost was associated with each of these factors (gangrene, $32,653 +/- $1534; age greater than 70, $28,089 +/- $1235; previous bypass, $29,666 +/- $1962). During the same time period, initial patient costs for 24 patients undergoing primary below-knee amputation and rehabilitation were $27,225 +/- $2896 S.E. Twenty-nine percent of the patients with below-knee amputations never walked again. The nonambulatory patients had a significant continuing expenditure for institutionalisation ($100/day) or home care ($270/week). These facts document the high cost of limb-threatening arteriosclerosis and its treatment by vascular reconstruction or primary below-knee amputation.(ABSTRACT TRUNCATED AT 250 WORDS)

Age Factors↗
PubMed1985

The present status of biliary tract surgery.

The techniques now routinely available for modern biliary tract diagnosis and treatment have allowed today's biliary surgeon to make a diagnosis more rapidly and with greater delineation of the pathology than a decade ago. As well, the extension of these diagnostic techniques has allowed interventional procedures to be carried out by both the radiologist and the endoscopist such that certain palliative procedures may now be done without laparotomy, and reoperations may be avoided by percutaneous or endoscopic approaches. Operative surgery in this area has not had the same spectacular advances. Rather there have been refinements and additions to previously used techniques that have standardized the procedures. Moreover, surgery has benefited from the technologies that have allowed the better preparation of the patient by the percutaneous or endoscopic relief of jaundice before an operation, the disimpaction of stones in cholangitis, and papillotomy in acute pancreatitis. The availability to the surgeon of the extremely slim flexible endoscope has made biliary endoscopy at operation simpler as well as providing a tool for percutaneous biliary endoscopy and stone extraction. In the same era, tests that were among the most common for diagnoses such as the oral cholecystogram and intravenous cholangiogram have become infrequent and perhaps obsolete. It has become obvious that the complete biliary surgeon must now have available isotopic, sonographic, and radiologic imaging, endoscopy, and other equipment not even imagined by those who pioneered biliary surgery.

Ampulla of Vater↗
PubMed1985

Choledochoduodenostomy after previous gastrectomy or duodenal operations.

Our results show choledochoduodenostomy to be safe in patients with a Billroth II duodenal stump or any previous duodenal operation with vascular interruption. These results are consistent with our use of choledochoduodenostomy as the preferred technique in all patients with residual stones, a dilated common duct or benign ampullary stenosis.

Aged↗
PubMed1984

Calcification in an insulinoma of the pancreas.

Calcifications in islet cell tumors of the pancreas are rarely seen radiologically. We are reporting a case of an insulinoma with "sunburst" type calcification that has been previously described as specific for cystadenoma or cystadenocarcinoma of the pancreas.

Adenoma, Islet Cell↗
PubMed1984

Acute acalculous cholecystitis.

Sixty-eight patients with acute acalculous cholecystitis were reviewed. The results of history and physical examinations were usually nondiagnostic. IDA cholescintigraphy (93 per cent accuracy rate) was the only reliable diagnostic modality. The results of oral cholecystography, intravenous cholangiography and ultrasonography were considerably less reliable. One-half of the patients had gangrenous cholecystitis. Cholecystectomy was the preferred operation with an over-all mortality of 9 per cent. IDA cholescintigraphy is an important new modality for the diagnosis of acute acalculous cholecystitis which, in the past, has often been difficult to diagnose.

Acute Disease↗
PubMed1983

The role of technetium-99m iminodiacetic acid (IDA) cholescintigraphy in acute acalculous cholecystitis.

Technetium-99m iminodiacetic acid (IDA) cholescintigraphy was performed in 15 patients with acute acalculous cholecystitis. Fourteen of the 15 patients with acute disease had positive findings, indicating the presence of cystic duct or common duct obstruction. One case in which the gallbladder was visualized failed to respond to sincalide stimulation; this was classified as a suggestive finding of disease. The diagnostic accuracy of 99mTc-IDA cholescintigraphy was far superior to the other imaging studies used (8 sonograms, 1 intravenous cholangiogram, 3 oral cholecystograms, 1 percutaneous transhepatic cholangiogram). The 99mTc-IDA study is recommended as the imaging procedure of choice for examining patients with suspected acute acalculous cholecystitis.

Acute Disease↗
PubMed1983

Single lung transplantation with cyclosporin immunosuppression. Evaluation of canine and human recipients.

Cyclosporin, a potent new immunosuppressive agent, was used (alone or in combination with other drugs) in 28 canine single lung allograft recipients. Mean recipient survival with good allograft function was 155 days with cyclosporin and far exceeded that obtained in previous single lung allograft recipients treated with standard immunosuppression (15 to 22 days). The results of these experiments were as follows: (1) 20% of the recipient animals exhibited no evidence of rejection whatsoever; (2) four of 28 animals survived more than 350 days with good allograft function; (3) 79% of the animals exhibited some evidence of rejection that was easily reversed in 74% of instances with corticosteroids; (4) 10 of 28 animals exhibited good lung allograft function 5 months or more after operation; (5) in cyclosporin-treated lung allograft recipients, rejection was diagnosed by the presence of infiltrate on chest roentgenogram, analysis of the cellular content of bronchoalveolar lavage samples, and decreased perfusion on 99mtechnetium lung scan; (6) complete healing without stenosis of the bronchial anastomosis occurred in 82% of the animals studied. One of two patients treated with cyclosporin after undergoing single lung allografting survived 7 weeks after transplantation and 4 weeks after contralateral pneumonectomy. Episodes of rejection were reversible, and the bronchial anastomosis healed normally. This overall experience indicates that cyclosporin, although not a perfect immunosuppressive agent, increases the likelihood of success with therapeutic single lung transplantation.

Adult↗
PubMed1982

Evaluation of the postoperative patient with 99mTc-IDA cholescintigraphy.

In order to assess the role of 99mTc-iminodiacetic acid (IDA) cholescintigraphy in evaluating postoperative patients, a total of 213 studies were performed in 189 patients over a 3-year time period. Of these, 130 studies were obtained in 125 cases with signs and/or symptoms suggesting postcholecystectomy syndrome. A normal sized duct that emptied within an hour ruled out significant pathology with a high degree of accuracy (97%). A less reliable finding of normalcy was the combination of ductal dilatation with functional patency in that three of 20 patients (15%) who exhibited this pattern were proven to have nonobstructing calculi in their common bile duct. AZ spectrum of abnormal findings was encountered. Ductal dilatation was a most significant indicator of partial or intermittent ductal obstruction when it was associated with altered time-activity dynamics in the ducts and secondarily, delayed biliary-to-bowel transit time of the radiotracer. Patterns indicating complete common duct obstruction, cystic duct remnants, and bile leaks also proved to be very sensitive. Seventy-three studies in 56 patients very accurately evaluated the integrity of biliary-enteric bypass anastomosis. Complete and partial obstructive patterns were similar in appearance to those encountered in postcholecystectomy syndrome. Several leaks were also detected in this patient population. Ten studies were performed in eight patients who underwent Billroth II gastroenterostomies primarily to see if afferent loop obstruction was present. Three of these patients did demonstrate dilated A-loops with stasis, thereby making a positive diagnosis possible.

Biliary Tract Diseases↗
PubMed1981

Primary tuberculous enterocolitis. Report of three cases and review of the literature.

Three patients had primary enteric tuberculosis. Therapy included antituberculous chemotherapy and resection of the involved segment of bowel with primary anastomosis in each case. The symptomatology, roentgenographic findings, histopathology, and treatment of enteric tuberculosis are reviewed. The surgeon must be aware of the fact that primary enteric tuberculosis continues to exist in the United States. Though no pathognomonic symptoms or syndrome occur in enteric tuberculosis, this disease should be included in the differential diagnosis of patients with vague abdominal complaints, weight loss, and anorexia.

Adult↗
PubMed1981

Progress in limb salvage by reconstructive arterial surgery combined with new or improved adjunctive procedures.

In the past nine years, 1196 patients whose lower extremity was threatened because of infrainguinal arteriosclerosis have been treated at Montefiore Hospital. In the last six years, limb salvage was attempted in 679 or 90% of 755 patients. Femoropopliteal (318), small vessel (204) and axillopopliteal (29) bypasses were used along with transluminal angioplasty (128) and aggressive local operations to obtain a healed foot. Immediate (one month) limb salvage was achieved in 583 or 86% of the 679 patients in whom revascularization was possible. The 30-day mortality rate was 3%. The cumulative life table (LT) survival rate of all the patients undergoing reconstructive arterial operations was 48% at five years. The cumulative LT limb salvage rate after all reconstructive arterial operations was 66% at five years. The cumulative LT patency rate of femoropopliteal bypasses was not influenced by angiographic outflow characteristics of the popliteal artery but was increased 15% by appropriate reoperations to 67% at five years. Cumulative LT patency and limb salvage rates of small vessel and axillopopliteal bypasses were more than 50% at two years. Of patients undergoing arterial reconstruction, 88% of those who died within five years did so without losing their limbs. Of all the patients in whom limb salvage was attempted, 68% lived more than one year with a viable, useable extremity, and 54% lived over two years with an intact limb. We believe this aggressive approach to limb salvage is justified, and can be undertaken with a low cost in mortality, knee loss and morbidity.

Aged↗
PubMed1981

Cyclosporin A in experimental lung transplantation.

Cyclosporin A (Cy A) has been used in combination with low-dose azathioprine (2 mg/kg/day for 14 days) or other immunosuppressives to treat 13 canine lung allograft recipients. Two of five dogs treated with Cy A and azathioprine survive at 13 and 6 months, respectively, with normal lung function and no evident rejection. The other three dogs in this group survived for over 5 months despite evidence of rejection which was reversed with methylprednisolone (50 mg/kg/day for 3 to 5 days). The addition of prophylactic corticosteroids or their substitution for azathioprine resulted in decreased survival without preventing rejection better. The lung allograft rejection that occurred with Cy A was usually later in onset and more easily reversed by corticosteroids than the lung rejection that occurred with standard immunosuppression. Cy A rejection was also sometimes qualitatively different. Perivascular mononuclear cell cuffs and a proportionally greater decrease in allograft perfusion with respect to ventilation were often more prominent than in rejection with standard immunosuppression. In some instances, decreased allograft perfusion evidenced rejection while the plain chest roentgenogram and ventilation remained normal. Except for infection, which only occurred in animals receiving prophylactic corticosteroids, there was no toxicity from Cy A. These findings indicate that this drug is the safest, most effective immunosuppressive agent yet available for use in lung transplantation.

Animals↗
PubMed1981

Small bowel obstruction: the role of nonoperative treatment in simple intestinal obstruction and predictive criteria for strangulation obstruction.

The clinical presentation, treatment, and results of 405 patients with mechanical small intestinal obstruction admitted to the Montefiore Hospital and North Central Bronx Hospitals were reviewed. The etiology of obstruction was adhesions 74%, malignancy 8.6%, hernia 8.1%, inflammatory bowel disease 5.2%, and miscellaneous causes 4.1%. The overall mortality rate for the series was 6.7%, and the incidence of bowel strangulation was 10.1%. Strangulation occurred in 33.3% of the hernia group, 9.0% of the adhesions group, and 2.8% of the malignancy group. The largest single cause of death was related to malignant disease--12 cases (44.4%). Six deaths (22.2%) were caused by bowel strangulation. Of the patients who received more than 24 hours of nonoperative therapy, 46% had relief of obstruction. There was no statistically significant difference in successful results between patients managed with long tubes compared to patients managed with nasogastric tubes. Conservative therapy for malignant obstruction was not successful in 85% of cases. The presence of bowel strangulation shows a positive correlation with age (greater than 70 years), feculant vomiting, peristaltic sounds, and a white blood cell count higher than 18,000/mm3. It shows no correlation with onset, localization or type of pain, duration of symptoms, temperature, tachycardia, or x-ray findings. The results of the study indicate that accurate criteria for small bowel obstruction therapy have not been clearly defined except in patients with incarcerated hernias. Nonoperative management is successful in a significnt percentage of patients.

Adolescent↗