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Biomedical subjects

D Altman

Publications and source records attributed to D Altman.

At least 19 recordsLinked to original sources
PubMed1992

Systemic toxicosis associated with azathioprine administration in domestic cats.

Five cats were treated with an azathioprine suspension (2.2 mg/kg of body weight on alternate days) and 2 cats were given vehicle (controls) for 9 weeks. Complete blood and platelet counts and serum biochemistry variables were monitored weekly. Bone marrow aspirates were evaluated every 3 weeks, and core bone marrow biopsy was performed at the end of the study. Profound neutropenia (less than 600 cells/microliters) was observed in all treated cats, and 1 cat developed pancytopenia. Treatment was discontinued if the WBC count was less than 3,000 cells/microliters. Four weeks after discontinuation of azathioprine, 1 treated cat again was given azathioprine at a lower dosage (1.1 mg of azathioprine/kg on alternate days) and neutropenia recurred within 2 weeks. During treatment, 3 cats developed thrombocytosis, and 2 developed thrombocytopenia. In 4 of 5 cats, neutropenia and thrombocytopenia resolved when azathioprine was discontinued. Bone marrow cytologic examination during treatment revealed reduction of the neutrophil line, with relative increase in monocytes. Core bone marrow biopsy at the completion of the study revealed hypocellular marrow with marked decrease in the myeloid series in cats given azathioprine. One of the cats that was treated with azathioprine had a hypercellular marrow with increased numbers of mature granulocytes and precursors; however, azathioprine had been discontinued 3 weeks prior to biopsy. Alterations in serum biochemical variables were not associated with azathioprine. Two cats that were treated with azathioprine developed respiratory tract infections, and 1 of them was euthanatized during the study.

Animals↗
PubMed1990

The British Hypertension Society protocol for the evaluation of automated and semi-automated blood pressure measuring devices with special reference to ambulatory systems.

With the increasing manufacture of expensive systems for the measurement of ambulatory blood pressure there is a need for potential purchasers to be able to satisfy themselves that the systems have been evaluated according to agreed criteria. The British Hypertension Society has, therefore, drawn up a protocol of requirements for the evaluation of these devices. This protocol incorporates many features of the American National Standard for Non-Automated Sphygmomanometers but includes many additional features, such as strict criteria for observer training, interdevice variability testing before and after a month of ambulatory use, and a new system of analysis which permits the test system to be graded. It is recommended that manufacturers of ambulatory blood pressure measuring devices should obtain an unbiased evaluation according to a recognized standard before a device is marketed.

Blood Pressure Monitors↗
PubMed1988

Regulation of an idiotype+ B cell lymphoma. Effects of antigen and anti-idiotopic antibodies on proliferation and Ig secretion.

The B cell surface Ig molecule plays an important regulatory role in delivering inductive/tolerogenic signals to the cell. In this paper, the effect of Ag and anti-idiotopic antibodies on the in vitro proliferation and Ig secretion of a B cell tumor was studied. The tumor (BCL1), which had been transfected with the TEPC-15 VH and VL Ig genes, expresses surface Ig and secretes antibody that binds the hapten phosphorylcholine. We found that Ag (C polysaccharide and phosphorylcholine carrier Ag) and two different anti-idiotopic antibodies, in the absence of T cells, all inhibited the proliferation of the T15+ transfectant cell line. The anti-idiotopic antibodies, but not Ag, also inhibited the secretion of T15 Ig by this cell line, suggesting different functional roles for Ag vs anti-Id in the regulation of B cell inactivation. The inhibition of secretion and proliferation appears to be cell cycle phase related. In addition, mouse rIL-4 could override the inhibition of proliferation induced in these studies. These phenomena, demonstrating that binding of surface Ig can result in the transduction of negative growth signals to a B cell tumor, can be viewed as a manifestation of immunologic tolerance. These findings collectively demonstrate that Ag and anti-Id mediate different signals to B cells via interaction with the surface Ig. Because of the monoclonal nature of the T15 transfectant and the anti-idiotypic antibodies, this system can be used to investigate the underlying molecular reactions involved in the B cell response and induction of tolerance.

Animals↗
PubMed1986

An endonuclease from Chlamydomonas reinhardtii that cleaves the sequence TATA.

An endodeoxyribonuclease, designated CreI, was purified 16,000-fold from zygotes of the eukaryote Chlamydomonas reinhardtii. CreI preferentially attacks the sequence TATA producing double strand breaks with 3'-phosphomonoester and 5'-hydroxyl termini. The endonuclease has an Mr = 27,000 and requires Ca2+ at pH 7.5 for optimal activity.

Base Sequence↗
PubMed1986

An evaluation of the Avionics Pressurometer III 1978 at home and in hospital.

The Avionics Pressurometer III is the only noninvasive indirect ambulatory blood pressure system which provides 24-h blood pressure measurements, but it has been subjected to limited evaluation. We report a critical evaluation comparing it to simultaneous intra-arterial blood pressures both at home and at hospital as well as during standardized exercise. Comparisons with simultaneous indirect methods were also made. Twenty-two hypertensives undergoing intra-arterial ambulatory blood pressure monitoring wore the two recorders for one day. The mean difference (standard deviation SD) for intra-arterial blood pressure--Avionics blood pressure was 2 (SD 8.6)/-14 (SD 10.3) mmHg at home and -3 (SD 15.4)/-11 (SD 12.3) mmHg at hospital. At the end of exercise the figures for the same comparison were -7 (SD 16)/0 (SD 15.6) mmHg. In general the agreement between intra-arterial and Avionics pressurometer recordings was closer for systolic than for diastolic blood pressures but there was wide variation for individuals as shown by the standard deviations about the mean difference. We did not use the recorder at night as patients complained that the noise kept them awake and so night-time blood pressures were not attainable. We do not think the recorder performed satisfactorily during physical exertion, and in view of its expense, this recorder is of limited potential value in supplying accurate information.

Adult↗
PubMed1985

Biliary sclerosis in patients receiving hepatic arterial infusions of floxuridine.

High response rates have been reported with hepatic intra-arterial infusions of floxuridine in patients having colorectal carcinoma metastatic to the liver. The major toxicity of this therapy has been described as "chemical hepatitis." In a randomized trial of intravenous v intra-arterial floxuridine, we observed that all 35 patients receiving intra-arterial therapy developed significant increases in alkaline phosphatase and, in some cases, serum glutamic oxaloacetic transminase and/or bilirubin. Seven patients receiving intra-arterial therapy were studied with cholangiography which, in all cases, demonstrated sclerosis of the intrahepatic and/or extrahepatic bile ducts. In addition, liver biopsies showed cholestasis and pericholangitis with minimal hepatocyte damage. These findings suggest that "biliary sclerosis" rather than "chemical hepatitis" is the predominant toxicity associated with hepatic intra-arterial infusions of floxuridine.

Aged↗
PubMed1979

Effect of labetalol on continuous ambulatory blood pressure.

1 The hypotensive action of labetalol was evaluated during 24 h by continuous intra-arterial ambulatory monitoring in 14 patients. The dose used ranged from 300--1800 mg daily. 2 The drug caused a significant reduction of systolic BP in 19 and diastolic BP in 20 of the 24 h of monitoring. Heart rate was also reduced but less markedly than BP. 3 The rapid early morning increase in BP was also effectively controlled. 4 The mild pre-waking increase in BP was not significantly reduced. 5 Labetalol treatment reduced the variation in systolic BP from the lowest observed quarter-hourly mean as compared with pre-treatment values. 6 The quarter hourly mean values were consistently smooth and revealed no sudden variations which might have resulted from postural hypotension.

Adult↗
PubMed1978

The politics of health care regulation: the case of the National Health Planning and Resources Development Act.

This paper examines the political and bureautic dynamics of health regulation under the National Health Planning and Resources Development Act and, to a lesser extent, the Carter Cost Proposal now before Congress. A number of underlying issues that affect the day-to-day exercise of health planning are considered, including the contest between state and local and federal government for program control, jurisdictional conflict between state and local planning agencies, and the unsettled roles to be played by professional planners, consumers, and providers. When we assess regulatory policy in health, these complicating factors must be added to the long list of handicaps that already exist. One important finding is that local planning agencies have embraced the task of health regulation somewhat more fully than had generally been expected. A number of explanations for this are offered. In short, the controlling factors in health planning are political, not technical, and there is more occurring at the state and local levels than many had predicted, although any impact is not likely to be dramatic.

Costs and Cost Analysis↗