Biomedical subjects
Publications and source records attributed to J M Phillips.
The numberous benefits and the minimal but acknowledged risks of laparoscopy are discussed. Factors related to complications include operator experience, instrument and equipment technology, types of procedures, and anesthesia.
This is a report of 1,079 patients who underwent laparoscopic clip sterlization as of March, 1974. A one-year follow-up was obtained on 977 patients, or 90.5 per cent. Complications due to the clip technique appear limited to postoperative cramps for 24 to 48 hours in 26 per cent of patients. No ectopic pregnancies were detected. Pregnancies, when corrected for unsuspected existing pregnancies and surgical and manufacturing errors, occurred in 2 to 6 cases, for a method failure rate of 2 to 6/1,000. This report documents that experienced laparoscopists can perform this practice with local anesthesia, in combination with first-trimester abortion, and in hospital facilities other than an operating room.
Dinitrophenylated polysucrose (DNP-Ficoll) elicits T cell-independent IgM anti-DNP antibody formation in mice. This antigen also elicits a heterogeneous IgG1 and IgG2 anti-DNP response, which is operationally as T-independent as the IgM response. However, a concomitant graft-versus-host reaction markedly enhances the IgG response (allogeneic effect). These results confirm those of others, indicating that a certain proportion of the precursors of IgG-producing cells can be triggered by some T-independent antigens. However, our results suggest that even with such antigens optimal triggering of IgG precursors requires T cell help.
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Safe and adequate pneumoperitoneum is dependent upon intraperitoneal pressure and not upon the number of liters of gas insufflated. Volume of gas delivered depends upon the size of the patient and whether there is any possible leakage. The Carboflator is a useful instrument for establishing controlled insufflation of gas and fail-safe intraperitoneal pressure.
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A single injection of mice with a low dose of sheep red blood cells results in a cyclic appearance of antibody-forming cells of the IgG classes. The peaks of the responses occur at the same time in the spleen and the thoracic lymph nodes. We have investigated the phenomenon with respect to IgG2a response by using the isoelectric focusing overlay assay and have assumed that in the great majority of cases, after immunization with limiting amounts of antigen, an individual spectrotype represents a "clonal" product. Enumeration of spectrotypes which arise only in the first peak and those which arise only in the second, suggests that the second peak of plaque-forming cells can be accounted for on the basis of the stimulation of a second population of precursor cells. Several possible mechanisms whereby new antigen-sensitive precursor cells can be turned on late in a primary response are discussed.
In September 1972, clinical trials of a spring-loaded clip for laparoscopic sterilization were begun and extended to a number of centers in the United States and overseas. As of March 1974, more than 1000 patients had undergone the procedure, usually performed under local anesthesia in an outpatient setting, with no fixed contraindications. Complications and pregnancy rates based on a preliminary 6-month follow-up are presented. Complications due to application of the clip appeared to be limited to postoperative cramps lasting 24 to 48 hours (26% of the patients). No ectopic pregnancies were reported. Pregnancies, when corrected for unsuspected pregnancies and misapplication of the clip, occurred in 2 of these first 1000 patients. The difficulties and relative contraindications learned from this unselected series and the advantages over electrocagulation techniques are discussed.
We have previously reported that a hypermetabolic state, resembling that produced by thryoid hormones, exists in the livers of animals treated chronically with ethanol. We propose that this alteration produces a relative hypoxia in the centrilobular zone of the liver which, if severe enough, leads to cellular death and to the production of hepatitis. Rats consuming ethanol for 30 days, given with a nutritionally adequate diet, and exposed to reduced oxygen tensions for only 6 hr, developed histological and biochemical evidence of hepatocellular necrosis and inflammatory lesions confined to the centrilobular zone. The severity was proportional to the degree of hypoxia. Pair-fed (nonalcohol) controls showed no such lesions. Treatment of the animals with propylthiouracil for 3-10 days abolished the hypermetabolic state of the liver in ethanol-consuming animals, and drastically reduced the histological and biochemical effects of hypoxia in them. These findings may have implications for pathogenesis and treatment of alcoholic hepatitis in man.
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