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E Kirk

Publications and source records attributed to E Kirk.

At least 37 records · Page 2Linked to original sources

Results and complications of intracranial pressure monitoring in 303 children.

303 consecutive children who had insertion of an intracranial pressure (ICP) monitor for various reasons were reviewed to determine clinical value and complications rate of ICP monitoring in this age group. 286 patients had a Camino fiberoptic monitor. Of the remaining cases, 9 had a ventricular catheter, 7 had an extradural Gaeltec monitor, and 1 had a subdural feeding tube. The reasons for monitoring the ICP were: trauma in 132 children, postoperative monitoring after tumor surgery in 91, head injury due to child abuse in 30, severe medical conditions such as meningitis, encephalitis, and near-drowning in 30, intracranial hemorrhage in 15, and hydrocephalus in 5 children. The median age at insertion was 6 years (range from 1 month to 17 years), and the median Glasgow coma score before insertion was 7. Median duration of monitoring was 3 days, and 35 children (10%) had surgical procedures performed for raised ICP detected by monitoring. 238 (78%) had nonsurgical measures to control raised ICP. 6 (15%) of 40 children with an initial ICP > 50 mm Hg made a good recovery, but there were no survivors among 37 children who had an ICP consistently > 60 mm Hg and only 1 disabled survivor among 42 children with an ICP consistently > 50 mm Hg. The outcome in all 303 children correlated with averaged readings of ICP over 24 h and initial Glasgow coma score, but did not correlate with initial ICP measurements. Complications of monitoring were few and consisted of infection in 1 (0.3%) child, intracranial hemorrhage in 1 (0.3%) who had low platelet counts, displacement of monitor in 3 (1%), and malfunction of monitor in 8 (2.6%) children. We conclude that ICP monitoring in the pediatric age group substantially influences our clinical management of unconscious children and is safe.

Adolescent↗

Alteration of lipid profiles in plasma of transgenic mice expressing human lipoprotein lipase.

Lipoprotein lipase (LPL) is a key enzyme required for the hydrolysis of triglyceride-rich particles. To assess the effects of increased plasma LPL on lipoprotein levels, transgenic mice expressing human LPL (hLPL) were produced. Abundant hLPL transcripts were detected in RNA from different tissues of transgenic mice which resulted in an increase in post-heparin plasma LPL activity of approximately 154%. On rodent chow (p = 0.01) and after a 16-h fast (p = 0.001), plasma triglycerides in transgenic mice were decreased by approximately 50% as compared to littermate controls. Gel filtration chromatography showed a 2-3-fold decrease in very low density lipoprotein triglycerides and cholesterol enrichment of low density lipoprotein. Transgenic mice maintained on a high carbohydrate diet exhibited a 78% (p = 0.03) lowering of low density lipoprotein and very low density lipoprotein cholesterol levels, in addition to a 68% (p = 0.01) lowering of total to high density lipoprotein cholesterol (TC/HDL-C) ratios compared to controls. The distribution of apoA-I and A-II were similar in the transgenics and their non-transgenic littermates, while the apoE distribution was mildly altered in the plasma from the transgenic mice. These data demonstrate that moderate increases in total LPL activity are associated with significant changes in lipoprotein levels and altered composition of lipoprotein particles.

Animals↗

Regulation by nutritional status of lipids and apolipoproteins A-I, A-II, and A-IV in inbred mice.

This study illustrates that genetic strain and feeding status can markedly influence tissue lipid concentrations and mRNA levels of apolipoprotein genes. C57BL/6 and BALB/c mice were maintained for 2 weeks on four test diets differing in amount of cholesterol and type of fat, and fasted for 4 h or 16 h prior to collection of tissues. For both strains, the primary effect of fasting from 4 h to 16 h was to paradoxically elevate triglyceride levels in plasma and liver, and to elevate hepatic apoA-IV mRNA levels. Triglyceride secretion rates, estimated after the injection of Triton WR-1339, suggested that elevations in plasma triglyceride levels were due to reduced clearance of very low density lipoproteins. Although plasma glucose levels decreased with fasting time for both strains, insulin levels decreased for BALB/c but not C57BL/6 mice regardless of diet. This suggests that factors thought to be mediated by insulin, (e.g., plasma free fatty acid concentrations; hepatic apoA-IV mRNA levels) may be influenced by local changes in insulin sensitivity, which are controlled genetically and are not reflected by plasma insulin levels. In summary, nutritional status influences a constellation of factors involved in lipid transport that also show strong genetic components and may influence subsequent analyses of gene expression in the mouse system.

Animals↗

Effects of alcohol on the central nervous system: implications for the neuroscience nurse.

Alcoholism is a chronic, progressive disease that devastates the patient and family. The chronic abuse of alcohol results in a multitude of pathological changes, particularly in the central nervous system. The toxic effects of acetaldehyde, a metabolic by-product of alcohol, and alcoholic beverage congeners have been associated with pathological changes in the central nervous system. Toxic effects of alcohol and addiction to alcohol reflect central nervous system changes. The alcohol withdrawal syndrome poses a potential life-threatening complication for the alcoholic patient. This paper discusses the pathological changes in the central nervous system, pharmacology of alcohol, and the alcohol withdrawal syndrome. Nursing implications to assist the neuroscience nurse in providing a highly specialized plan of care for the alcoholic patient are presented.

Alcohol Withdrawal Delirium↗

Increased 2,5-adenylate synthetase activity in the spleens of BALB/c mice during hypoxia-stimulated erythropoiesis.

In response to prolonged, intermittent exposure to hypoxia, the spleens of adult BALB/c mice displayed an initial increase and subsequent decrease in erythropoietic activity. The enzyme 2,5-adenylate synthetase was assayed during this period, and a direct relationship was found between the rate of red cell production and enzyme activity; that is, 2,5-adenylate synthetase activity was maximum in the spleen cell populations that contained the largest number of nucleated erythroid cells and minimum in those populations that contained the fewest nucleated erythroid cells. In contrast to this finding, synthetase activity was inversely related to the number of lymphocytes present in these spleen cell populations. On the basis of these observations, it appears that 2,5-adenylate synthetase is present in nucleated erythroid cells. If active in late erythroblasts, 2,5-adenylate synthetase may function as an inhibitor of DNA synthesis and/or hemoglobin synthesis.

2',5'-Oligoadenylate Synthetase↗

The 2'-5' adenylate (2-5A) system in erythropoiesis.

The trimer and tetramer core forms of 2'-5' Adenylate (2-5A) were tested in vitro for their effect on mouse liver CFU-E. Both forms of 2-5A core partially inhibited the CFU-E response to erythropoietin when given as a single dose at time 0 hours. Approximately 25% fewer colonies were seen after 2-days growth following exposure of the CFU-E to 0.1 mM 2-5A core. A 0.01 mM concentration of exogenous 2-5A core was not inhibitory. Endogenous 2-5A synthetase activity was assayed in spleen cell lysates from mice made anemic by several injections of phenylhydrazine. This method of treatment stimulated erythropoiesis, and this was directly correlated with an increase in the rate of enzyme activity measured by lysate conversion of 14C-ATP to 2-5A (our in press data suggests that the same may occur with hypoxic stimulation). This suggested to us that endogenous 2-5A synthetase and its 2-5A, a known inhibitor of DNA synthesis and protein synthesis, may help to regulate some of the late events in erythropoiesis.

2',5'-Oligoadenylate Synthetase↗

A door of hope.

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England↗