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Biomedical subjects

M M Ravitch

Publications and source records attributed to M M Ravitch.

At least 19 recordsLinked to original sources

A stapling instrument for end-to-end inverting anastomoses in the gastrointestinal tract.

A stapling instrument is described for end-to-end inverting anastomoses applicable principally to low rectal anastomosis or esophagogastric or esophagojejunal anastomosis. The instrument creates an inverting anastomosis held by a double staggered row of stainless steel wire staples creating an anastomosis 21.2 mm internal diameter with no significant inverted flange. The early experience is encouraging.

Animals

The price of weight loss by jejunoileal shunt.

In the performance of end-to-end jejunoileal shunt, operative mortality can be nearly eliminated and late deaths largely prevented by assiduous care and follow-up. We attempted to prevent serious complications by regular outpatient visits. However, 703 outpatient visits costing $49.00 per visit failed to improve results. There were 170 readmissions among 64 patients lasting 4--57 days (average hospital stay--16 days per admission at $3,000.00). Twenty-four of those patients alive and followed 18 months or more (53%) sustained adequate weight loss and were free of major problems. Patient satisfaction nevertheless appears high, and when there has been a good weight loss, even severe problems tend to be glossed over by the patient. The ultimate outcome is still unknown, but it seems clear that many of the patients are in a state of controlled malnutrition, which may lead to progressive penalties. We have documented gross pathologic lesions in the bypass enteritis syndrome and draw attention to neurologic sequelae of the bypass, which probably represents deficiency manifestations. Despite brilliant results in some patients and satisfactory results in perhaps half, the cost in life, suffering, dollars, patient and physician time, the uncertain long-term effects, and the unpredictability of the weight loss, all place in question the appropriateness of jejunoileal shunt as the remedy for morbid obesity.

Adult

Intussusception.

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Humans

Surgery in 1776.

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General Surgery

The operative management of von Recklinghausen's neurofibromatosis in children, with special reference to lesions of the head and neck.

Eighty-five patients with von Recklinghausen's neurofibromatosis were seen at the Children's Hospital of Pittsburgh from 1952 through 1976. Nineteen of these patients had significant head or neck extracranial lesions. Based upon these and a personal series of seven other head and neck patients, we emphasize several critical points in the care of these patients: (1) large, painful, conspicuous, or strategically placed tumors should be removed: (2) early removal is easier and improves cosmetic results; (3) neck and chest tumors carry a high risk of subsequent rapid vertebral angulation with possible paralysis; (4) close observation allows timely application of appropriate surgical procedures.

Adolescent

Absorptive and digestive function of the jejunum after jejunoileal bypass for treatment of human obesity.

Rates of absorption of leucine, glycylleucine, and glucose, and rates of hydrolysis of maltose were determined in the jejunum of a group of obese persons before and at intervals (between 2 and 20 montsh) after jejunoileal bypass for the treatment of obesity. The leucine absorption rate was significantly reduced after the bypass, but the absorption rates of glycylleucine and glucose as well as the hydrolysis rate of maltose were unchanged. Light microscopic investigation of the jejunal mucosa, obtained by a peroral biopsy technique before and at 7 months after by bypass operation, did not reveal any change in the histological appearance of this tissue. The plasma aminograms of all 7 patients were compared before and at intervals after the bypass operation; all exhibited a constant pattern of change that was characterized by significant decreases in the concentrations of serine and glycine and by significant decreases in the concentrations of valine, isoleucine, leucine, tyrosine, and phenylalanine. This pattern of change, which is characteristic of protein depletion, persisted during the entire period of observation. Two of these 7 patients developed laboratory evidence of hepatic dysfunction. It is concluded that (1) protein depletion is common to all patients with jejunoileal bypass with or without hepatic dysfunction; and (2) protein depletion results in a sustained reduction in free amino acid absorption in the jejunum.

Adult

The permanent gastrostomy. Use of the gastrointestinal anastomotic stapler.

A permanent feeding gastrostomy was quickly and simply constructed in 29 patients with low operative risk using the gastrointestinal anastomotic stapler. The technique consisted of a simple application of this stapler on a carefully selected section of the stomach to form a Janeway type of gastrostomy. Activation of the device placed two double rows of staples and cut between them. This left the mucosa in approximation both in the tube and in the body of the stomach. A few additional Lembert sutures was all that was necessary. There were no suture line leaks nor other complications peculiar to the method.

Adolescent

Experimental pulmonary venous occlusion.

Complete interruption of pulmonary venous return from the left lung in rabbits is compatible in some instances with prolonged survival with little systemic effect. The main cause of death less than 48 hours after interruption of pulmonary venous return is pulmonary-pulmonary aspiration and respiratory insufficiency due to spillover of frothy, bloody fluid, after which infection may play a part. Marked anemia after unilateral pulmonary venous ligation attests to the loss of blood into the lung. Death from unilateral pulmonary venous ligation did not occur if the corresponding main bronchus was ligated to prevent pulmonary-pulmonary aspiration; Despite ligation of the pulmonary veins the corresponding pulmonary artery remained patent.

Anemia