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Biomedical subjects

M R Gates

Publications and source records attributed to M R Gates.

7 recordsLinked to original sources
PubMed2006

Pregnant mothers out of the perinatal regionalization's reach.

INTRODUCTION: Birth of very low birth weight (VLBW) infants outside subspecialty perinatal centers increases risk for death and major morbidities. OBJECTIVE: The purpose of this study is to evaluate barriers to utilizing a regional perinatal center for the birth of VLBW infants to mothers not living in the immediate vicinity of the center. METHODS: We conducted a retrospective cohort study of VLBW infants residing in the catchment area of a community level II, Specialty Neonatal Unit (SN) admitted to a Regional Subspecialty Neonatal Intensive Care Unit (RC) between January 1999 and December 31, 2004. Maternal demographics and prenatal care as well as outcomes were compared by place of birth. RESULTS: Out of 98 VLBW infants admitted to the RC, 49 (50%) were delivered outside the RC (out-born) and 49 (50%) were born at the RC (in-born). There was no statistical difference in insurance coverage, race, gestational age, severity of illness or maternal demographic factors between out-born and in-born infants. Less than adequate prenatal care rather than distance of maternal residence from the RC was associated with birth outside the RC. Adjusting for prenatal care, distance of residence from the RC increased the risk for delivering outside the center in the subset of mothers insured by Medicaid. CONCLUSIONS: Mothers of VLBW infants who received less than adequate prenatal care and did not live in the vicinity of a subspecialty center had an increased risk for delivery outside that center compared to those with adequate care. Appropriate place of birth for VLBW infants to low-income mothers may be influenced by the distance of their residence to an RC.

Cohort Studies↗
PubMed2002

Kainate receptor agonists, antagonists and allosteric modulators.

Interest in kainate receptors has increased over the past few years. Our understanding of their physiology and pharmacology has improved markedly since their original cloning and expression in the early 1990s. For example, agonist profiles at recombinant kainate receptors have been used to identify and distinguish kainate receptors in neurons. Furthermore, the development of selective antagonists for kainate receptor subtypes has increased our understanding of the functional roles of kainate receptors in neurons and synaptic transmission. In this review we described the activity of agonists and antagonists at kainate receptors and their selectivity profiles at NMDA and non-NMDA receptors.

Allosteric Regulation↗
PubMed2001

Novel AMPA receptor potentiators LY392098 and LY404187: effects on recombinant human AMPA receptors in vitro.

The present study describes the activity of two novel potent and selective AMPA receptor potentiator molecules LY392098 and LY404187. LY392098 and LY404187 enhance glutamate (100 microM) stimulated ion influx through recombinant homomeric human AMPA receptor ion channels, GluR1-4, with estimated EC(50) values of 1.77 microM (GluR1(i)), 0.22 microM (GluR2(i)), 0.56 microM (GluR2(o)), 1.89 microM (GluR3(i)) and 0.20 microM (GluR4(i)) for LY392098 and EC(50) values of 5.65 microM (GluR1(i)), 0.15 microM (GluR2(i)), 1.44 microM (GluR2(o)), 1.66 microM (GluR3(i)) and 0.21 microM (GluR4(i)) for LY404187. Neither compound affected ion influx in untransfected HEK293 cells or GluR transfected cells in the absence of glutamate. Both compounds were selective for activity at AMPA receptors, with no activity at human recombinant kainate receptors. Electrophysiological recordings demonstrated that glutamate (1 mM)-evoked inward currents in human GluR4 transfected HEK293 cells were potentiated by LY392098 and LY404187 at low concentrations (3-10 nM). In addition, both compounds removed glutamate-dependent desensitization of recombinant GluR4 AMPA receptors. These studies demonstrate that LY392098 and LY404187 allosterically potentiate responses mediated by human AMPA receptor ion channels expressed in HEK 293 cells in vitro.

Allosteric Regulation↗
PubMed1997

The novel atypical antipsychotic olanzapine, but not the CCK-B antagonist LY288513, blocks apomorphine-induced disruption of pre-pulse inhibition.

Pre-pulse inhibition (PPI) of the acoustic startle response is the diminution of the startle response when the startle stimulus is preceded by a weaker, non-startle-eliciting stimulus. Deficits in PPI occur in animals following the administration of apomorphine and in schizophrenic patients. In this study, we examined the ability of the novel atypical antipsychotic olanzapine and the cholecystokinin (CCK)-B antagonist LY288513 to reverse the apomorphine-induced disruption of pre-pulse inhibition. Olanzapine (3.0 and 5.0 mg/kg, i.p.), but not LY288513 (1.0-100 mg/kg, p.o.), blocked apomorphine-induced disruption of PPI. These results indicate that olanzapine, but not LY288513, has dopamine antagonist properties in vivo and predict that olanzapine, but not LY288513, will have antipsychotic activity in man.

Acoustic Stimulation↗
PubMedDate not supplied

User-friendly computerized quality assurance program for regionalized neonatal care.

In October 1983 a computerized data base system was implemented to perform quality assurance in the neonatal referral region of the University of Michigan. This system was customized to match and expand forms and reports already in use. It is menu driven, requires only rudimentary skills, and is compatible with existing computer equipment. To assess the effectiveness of the program in monitoring and improving neonatal care within the region, data from the first full year (1984) were compared with data from the last full year (1990). Statistically significant changes were found for referring physician presence at transfer, a greater assumption of initial stabilization procedures by community hospital personnel (continuous cardiorespiratory monitoring, orogastric tube placement, provision of respiratory support, blood glucose screening, blood gas evaluation, blood culturing, and antibiotic therapy), and an overall improvement in patient status before transfer. Review of reports generated by data analysis enables design of educational programs that are hospital specific and that focus on problems or deficiencies determined during quality assurance conferences. The chief benefit of this system is the provision of an objective basis for constructive criticism, which leads to both cognitive and behavioral changes in care providers and ultimately improves the delivery of care to neonates.

Data Display↗