Revisiting our roots.
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Delivery of Health Care↗
Biomedical subjects
G D Zuidema
Publications and source records attributed to G D Zuidema.
On the supply of physicians.
The congressionally created Council of Graduate Medical Education is conducting a study to assess the adequacy of the current and future supply of physicians in six specialties. The study is revising and updating the needs-based method used by the Graduate Medical Education National Advisory Committee and using this method to project the requirements for physicians for the next two decades. Projections on the supply of physicians will be based on the latest data from the federal government's Bureau of Health Profession's health manpower model. Previous physician manpower studies are reviewed to provide a historic perspective and a frame of reference for the variables, data sources, and assumptions being considered by the Council of Graduate Medical Education study.
Forecasting↗
Preventing postoperative acute bleeding of the upper part of the gastrointestinal tract.
Two hundred and ninety-eight critically ill patients at risk for the development of postoperative stress ulcers and bleeding were randomized into three groups. The first group comprised 85 patients who received meciadanol, a new bioflavonoid, 500 milligrams every six hours through a nasograstric tube; the second group comprised 100 patients who received sucralfate (crushed tablets), 1,000 milligrams every six hours through a nasogastric tube, and the third group comprised 113 patients who received an antacid (Maalox [magnesium aluminum hydroxide gel]) through a nasogastric tube at an initial dose of 15 milliliters every hour. The gastric pH was measured hourly and titrated to a pH greater than or equal to 4.0 in patients in the group receiving the antacid. The gastric pH was measured every two hours in the other two groups. Bleeding in the upper part of the gastrointestinal tract was determined visually (frank blood in gastric contents) or by guaiac testing. Bleeding occurred in seven patients receiving meciadanol, nine receiving sucralfate and six receiving the antacid. The difference in rates of bleeding was not statistically significant. Correlation between the severity of illness index and the development of bleeding was poor, at least in the low and intermediate index range. In contrast, there was a strong correlation between the age of the patient and the development of bleeding. Only one patient younger than 50 years had bleeding develop. Apparently, meciadanol exerts its action by a mechanism other than pH control. It may, therefore, fill an important gap in the ability to prevent postoperative stress ulcers and bleeding.
Acute Disease↗
Surgery and the Society of University Surgeons.
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General Surgery↗
Closed-suction versus Penrose drainage after cholecystectomy. A prospective, randomized evaluation.
Closed-suction drainage was compared prospectively to open, passive drainage (Penrose drains) in 128 patients undergoing cholecystectomy. Patients were randomized at the time of operation to receive either closed-suction drains (Group I, 67 patients) or Penrose drains (Group II, 61 patients). The preoperative clinical parameters of the two groups were similar. The patients in Group I when compared with those in Group II had a shorter duration of drainage (3.3 days and 4.1 days, respectively, p less than 0.01), a lesser volume of drainage in the first 48 hours postoperatively (78 ml and 132 ml, respectively, p less than 0.001), a decreased incidence of fever on the night of operation (24 of 67 patients and 39 of 61 patients, respectively, p less than 0.05) and on the first postoperative day (26 of 67 patients and 32 of 61 patients, respectively, p less than 0.05), and a lower leukocyte count on the first postoperative day (12,000 cells/mm3 and 14,100 cells/mm3, respectively, 0.05 less than p less than 0.1). Patients in Group I tended to have a lower rate of wound infection (1 of 67 patients versus 5 of 61 patients in Group II, 0.05 less than p less than 0.1) and had a much lower incidence of drain site tenderness (8 of 67 patients in Group I versus 24 of 61 patients in Group II, p less than 0.05). This study demonstrates the superiority of closed-suction drains over open, passive drains after cholecystectomy.
Cholecystectomy↗
Experimental pancreatic allotransplantation in large animals. The role of donor kidney and cyclosporine in modifying rejection.
Experiments were carried out in outbred dogs and pigs to evaluate the relative immunogenicity of pancreatic islets and segmental pancreas grafts, and whether these could be ameliorated by transplanting a kidney simultaneously from the same donor animal. Various immunosuppressive regimens were also studied. Pancreatic islet allografts never normalized blood glucose in totally pancreatectomized recipients despite the use of cyclosporine (CsA) in high doses (40 mg/kg/day) and the simultaneous transplantation of a kidney from the same donor. These grafts which never "took" contrast sharply with the experience of pancreatic islet autografts prepared in the same way and inoculated into the spleen, which in all nine instances normalized blood glucose in pancreatectomized recipients. Segmental transplants were performed in swine with duct drainage into the jejunum. Totally pancreatectomized pigs died at 7.8 +/- 1.0 days. In recipients suppressed with low-dose azathioprine (Az) and prednisone (Pred) pancreas grafts alone were rejected in 12.9 +/- 10 days. Synchronous pancreas and kidney transplants treated similarly extended the mean survival of pancreatic grafts to 20 +/- 10 days--which, however, was not significant (P less than 0.1 greater than 0.05). Mean survival time of pancreatic grafts in recipients receiving CsA at 20 mg/kg/day and prednisone 1 mg/kg/day was 14 +/- 6.3 days. The combination of CsA 20 mg/kg/day, Az 2 mg/kg/day, and Pred 1 mg/kg/day prolonged the mean survival time to 39.8 +/- 22 days. These results allow us to conclude that: crude preparations of islet tissue invariably capable of normalizing blood sugar at day 4 when used as autografts failed to "take" despite the existence of alternative sources of antigen present in a well vascularized kidney from the same donor, and despite very high dosages of CsA; triple immunosuppressive therapy had synergistic effects on pancreatic allograft survival; and simultaneous transplantation of kidney and pancreas had little effect on survival times of the pancreas or the kidney.
Animals↗
Covert splenic abscess: a continuing challenge.
Although splenic abscess is a rare cause of intra-abdominal sepsis, the mortality rate remains high especially in patients with silent or covert lesions. The clinical presentation and course of five patients with overt splenic abscess and seven patients with covert splenic abscess seen during a thirty year period were analyzed. Average age of patients with overt lesions was 44.5 years. Direct extension from a contiguous source, hematogenous spread from a distant site (metastatic) and trauma comprised the known etiologies. Clinical features of localized left upper quadrant sepsis were commonly present but only one patient exhibited multiple organ failure. The clinical diagnosis was established preoperatively in four patients (80%) and all underwent splenectomy without mortality. All resected spleens contained solitary abscesses. In contrast, patients with covert lesions tended to be older (average age 56.1 years), uniformly exhibited multiple organ failure and rarely demonstrated local clinical findings of left upper quadrant sepsis. Trauma was a less common etiology than metastatic infection and direct extension. Four patients died without operation. Three patients underwent exploration for unrelated reasons, but the diagnosis of splenic abscess was made intraoperatively in only one patient. Mortality among patients with covert lesions was 86%. Multiple splenic abscesses were demonstrated in all patients with covert lesions. Splenic abscess presents as a spectrum of clinical disease. Solitary lesions can be readily diagnosed and treated by splenectomy. Multiple abscesses are usually covert, associated with multiple organ failure and highly lethal. The role of splenectomy in patients with covert lesions remains unknown.
Abscess↗
Proposed legislation could hamper biomedical research.
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Animal Welfare↗
Surgical decision making. The reliability of clinical judgment.
Elective surgery second opinion programs are predicted on strict acceptance of the accuracy of the consultant's surgical judgment. The reliability and reproducibility of clinical judgment, therefore, become basic to the effectiveness of such programs. This aspect, however, has received little attention. We report a randomized and controlled survey of surgical specialists which defines agreement/disagreement patterns in surgical decision-making for seven elective surgical procedures. For each disease process, four case histories, including at least one control, were developed by specialty panels of physicians. The case summaries described fictional patients who were seeking professional consultation. The histories were mailed to a random sample of Board-certified specialists from the State of Maryland and the District of Columbia. The response rate was approximately 80% for all five specialties. The respondents were asked to indicate whether they would (Yes) or would not (No) perform the surgical procedure in question. Factual knowledge was not sought, but instead the application of that knowledge and experience to decide on the need for surgical intervention. By comparing the responses for each case history, the agreement/disagreement patterns of inter-observer surgical judgment were determined. Analysis of the data revealed a marked divergence of opinion concerning the need for surgery. The significant point of this study is that surgical judgment differs to a major degree from one surgeon to the next. In a second-opinion program the number of consultants needed to provide a reliable clinical decision probably exceeds the number who are logistically available and that the patient would be willing to visit. Surgical decision-making is a semi-exact scientific process, and it is unreasonable to expect exact answers to clinical problems.
Certification↗
Mesocaval shunts for the control of bleeding esophageal varices.
Results in 44 patients with esophageal bleeding who underwent a mesocaval shunt utilizing a prosthetic graft are presented. Portal hypertension was secondary to alcoholic cirrhosis in 30 patients, to chronic active hepatitis in eight, to primary biliary cirrhosis in four, to cirrhosis secondary to inflammatory bowel disease in one, and to portal vein thrombosis following splenectomy in one. Thirty-six shunts were performed during the emergent or semiemergent time period, and only eight were performed electively. Sixteen of the patients were Child's class A, 16 were class B, and 12 were class C. There were no hospital deaths in the emergency shunt group (of eight patients); there was a 12% mortality rate for patients undergoing semiemergency shunts (two of 17 patients) and a 42% mortality rate for patients who had emergency shunts (eight of 19 patients). Death was related more closely to hepatic reserve, however, than to timing of the shunt. Among the 32 class A and B patients, there were only three deaths in hospital (9%), as compared with seven deaths among the 12 class C patients (58%). Portal-systemic encephalopathy was high in the period immediately after operation (13 of 34 patients, 38%), but it was a chronic problem following discharge from the hospital in only three of 34 patients (9%). The mesocaval shunt is a safe, effective procedure for the control of variceal bleeding in class A and class B patients in any time period, but it carries a high operative mortality risk in the class C patient when it is performed as an emergency operation.
Adult↗
Evaluation of atropine in acute pancreatitis.
A prospective randomized clinical trial was carried out to evaluate the efficacy of atropine in the treatment of acute pancreatitis. Fifty-one patients with elevated amylase levels, and with the clinical signs and symptoms of acute pancreatitis, were included in the study. All were treated with fluids intravenously and analgesics, and a nasogastric tube if needed. In addition, on a random basis, 19 were given atropine intramuscularly and 32 were not. The clinical courses of the two groups of patients did not differ significantly.
Acute Disease↗
The application and interviewing process for surgical house officership.
The application and interviewing procedure for surgical house officership is an important process to both the medical student and the clinical department. Up-to-date, informative, and honest appraisals of the training programs under evaluation must be obtained. A survey was undertaken to compare and contrast students' and surgical department members' perceptions of nationwide surgical residency application procedures. It is concluded from this sampling that the majority of medical students applying to university-sponsored surgical training programs and the training institutions themselves generally are satisfied with the present application and interviewing experience. Certain areas in need of reform were elucidated, and the following recommendations are offered to aid in the development of a more effective process: (1) if possible, the descriptive information brochure should be updated on a yearly basis and must be comprehensive in scope; (2) when "en masse" interviewing is conducted, it should be held on a number of dates during the year, not just one, and a limited time for "walk-in" interviews should be allowed; (3) an opportunity should be available for the spouse or fiance'(e) to accompany the applicant; (4) an interviewer should prepare for an interview by having read the applicant's file beforehand; and (5) the interviewing schedule should be arranged so that the applicant is able to meet either the department chairperson and/or program director.
General Surgery↗
Low-dose heparin--concern and perspectives.
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Heparin↗
Steroid administration and acute pancreatitis: studies with an isolated, perfused canine pancreas.
Steroid administration has been suspected of causing acute pancreatitis for over 20 years. Clinical and experimental data, however, have failed to firmly establish the association or to uncover a pathogenic mechanism. Utilizing an isolated, ex vivo, perfused, canine pancreas preparation, the acute effects of large doses of steroids on the pancreas were evaluated. Using a dose of 200 mg of methylprednisolone, there were no significant differences between the control and steroid-treated preparations in terms of gross appearance, weight gain, serum amylase, or pancreatic secretion over a 4 hour perfusion period. When the dose of methylpredisolone was increased to 400 mg, again there were no significant differences in gross appearance, weight gain, or serum amylase during a 3 hour perfusion period. However, pancreatic secretion was initially depressed in the steroid-treated preparations. Following a maximal secretory stimulus (secretin), secretion markedly increased during the fourth hour of perfusion, but again was significantly less in the steroid-treated glands. Viscosity of pancreatic secretions was significantly increased in the steroid-treated glands. These studies suggest that steroids have a mild inhibitory effect on pancreatic secretion, which might be mediated through an increase in viscosity.
Adrenal Cortex Hormones↗
The impact of social change on medical education.
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Education, Medical↗
Assessment of small intestinal recovery from ischemic injury after segmental, arterial, venous, and arteriovenous occlusion.
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Animals↗
Bile acid composition in patients with and without symptoms of postoperative refulx gastritis.
Reflux of bile into the stomach is common after surgery for duodenal ulcer disease; however, only a minority of patients may develop significant gastritis and pain. Gastric aspirates from two groups of patients after operation for duodenal ulcer were quantitatively and qualitatively analyzed. Group A patients were asymptomatic and the bile composition was normal. Group B patients were symptomatic and had a significant increase in the secondary bile acid, deoxycholic acid. The concentration of bile acid was similar in the two groups. This alteration in bile acid composition, with an increase in deoxycholic acid, may be an important factor in determining which patients with bile reflux develop gastritis.
Bile↗
The use of silastic transhepatic stents in benign and malignant biliary strictures.
Between 1969 and 1978, 45 patients with biliary strictures have been managed surgically utilizing silastic transhepatic stents. In 25 patients the strictures were benign. After resection or dilatation of the benign stricture, an hepaticojejunostomy was performed to a Roux-en-Y loop. The anastomosis was stented with a large bore silastic tube with multiple side holes passed through the biliary tree, out the anterior surface of the liver, and then out through the abdominal wall. There was one hospital death. Most stents were left in place for one year. Of the 15 patients with long-term follow-up, all have had excellent results. In 20 patients the strictures were malignant and involved the common hepatic duct in 10 patients or its bifuraction in 10 patients. In 14 patients the tumor was thought to be primary in the biliary tree, and in six patients the tumor was felt to represent a metastasis or direct extension from another site. In three patients the tumors were resected, and in the remaining they were dilated or bypassed. After positioning a silastic transhepatic stent, a hepaticojejunostomy was carried out. There were two hospital deaths. Serum bilirubin on admission average 17.1 mg%, and after decompression 1.8 mg%. Five patients have survived over one year, and two over two years. Postoperative radiotherapy and a primary biliary tumor favored longer survival.
Adolescent↗