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Biomedical subjects

J Moore

Publications and source records attributed to J Moore.

At least 451 records · Page 25Linked to original sources
PubMed1990

Monosynaptic connexions of single V interneurones to the contralateral V motor nucleus in anaesthetised rats.

We have used the extracellular spike triggered averaging method to obtain evidence for a monosynaptic connexion of single V (trigeminal) interneurones, located in the region immediately caudal to the V motor nucleus, onto neurones within the contralateral V motor nucleus. The extracellular fields recorded in the contralateral nucleus are of smaller amplitude than those detected within the ipsilateral nucleus and the implications of this are discussed.

Action Potentials↗
PubMed1990

Routine serologic tests in the differential diagnosis of the adult nephrotic syndrome.

From 1980 to 1985, we performed biopsies on 87 adults with nephrotic syndrome (NS). The patients were tested for whether serologic studies obtained routinely at biopsy added to clinical diagnostic accuracy. Using history, physical examination, complete blood cell count (CBC), chemistry panel, urinalysis, and urine creatinine and protein, four nephrologists each predicted whether the patient had primary NS (PNS) or secondary NS (SNS), and the most likely histopathologic entity. Six months later, each nephrologist used this information, with results of tests of sera for fluorescent antinuclear antibody (FANA), rheumatoid factor (RF), complement components, hepatitis B surface antigen (HBsAg), venereal disease research laboratory serology (VDRI), cryoglobulins and protein electrophoresis (SPEP), with an erythrocyte sedimentation rate (ESR) and protein electrophoresis of the urine (UPEP), to make identical predictions. Histopathology was established by renal biopsy. We analyzed the concordance between nephrologists' choices and biopsy results both before and after serologic tests were available with a kappa statistic. Preserology concordance was moderate (kappa = 0.52), and identical to postserology concordance (kappa = 0.51) for both PNS versus SNS and actual histopathology. Serologies were rarely abnormal without clinical suspicion. These results suggest routine serologic testing does not improve diagnostic accuracy in adult NS.

Adult↗
PubMed1990

Independent threats and self-evaluation maintenance processes.

The present study investigated the independence of Self-Evaluation Maintenance (SEM) processes and the larger self-system. SEM processes are activated whenever another's performance is made salient relative to one's own. According to the SEM model, when one is outperformed by a close other on a task high in self-relevance, self-esteem is lowered and a negative affect state is generated. When one is outperformed by a close other on a task low in self-relevance, however, self-esteem and positive affect are actually enhanced, because one can take pride in the other's accomplishments. There are many sources of threat or enhancement to self-esteem, however, that are unrelated to one's performance relative to another's. The present study, using American undergraduates as subjects, examined the impact that these unrelated self-esteem threats or enhancements might have on SEM processes, that is, whether a prior unrelated ego-threatening or ego-enhancing experience modulates the effects of SEM processes. It was expected that a prior ego-threatening experience would augment the impact of SEM variables, whereas an ego-enhancing experience would attenuate the effect. Results, however, indicated little interaction between SEM processes and unrelated threats or enhancements to self-esteem.

Achievement↗
PubMed1990

Rapid and quantitative detection of enzymatically amplified HIV-1 DNA using chemiluminescent oligonucleotide probes.

A hybridization protection assay (HPA) that uses acridinium ester (AE) labeled oligonucleotide probes which are specific for a conserved gag gene region of human immunodeficiency virus type 1 (HIV-1) was developed to measure the amount of HIV-1 nucleic acid. Hybridization of the single-stranded probes with their target HIV-1 sequences protected the chemiluminescent AE group from subsequent alkaline hydrolysis. The chemiluminescence from the residual AE could be easily quantitated in a luminometer. The entire process comprising template dissociation, hybridization, alkaline hydrolysis, and chemiluminescence measurement can be completed in less than one hour and does not require the separation of hybridized probe from unhybridized probe. We demonstrated that HPA could quantitatively measure the amount of DNA amplified by polymerase chain reaction. A comparative study using amplified DNA from the peripheral blood mononuclear cells (PBMC) of HIV seropositive and seronegative persons showed that HPA was as sensitive as the previous methods using 32P-labeled DNA probes.

Acridines↗
PubMed1990

Preanaesthetic medication with clonidine.

The purpose of this study was to evaluate oral clonidine in a dose of 0.3 mg as a routine premedicant. Sixty-nine normotensive female patients were studied in a randomized double-blind investigation in which clonidine was compared with an inert treatment. Clonidine produced a significant reduction in anxiety (P less than 0.05) and sedation and a reduction in the sleep dose of methohexitone (P less than 0.05). Tachycardia in response to intubation was attenuated by clonidine (P less than 0.05). However, the magnitude of the increase in arterial pressure after intubation was not affected. Intraoperative and postoperative hypotension were common after premedication with clonidine 0.3 mg and caution is urged in its use as a premedicant.

Administration, Oral↗
PubMed1990

Laryngeal mask airway for caesarean section.

The use of a laryngeal mask airway is described in a patient for emergency Caesarean section, when tracheal intubation was not possible. Provision of the laryngeal mask airway for use in the Maternity Unit is discussed.

Adult↗
PubMed1990

The membrane properties and firing characteristics of rat jaw-elevator motoneurones.

1. We have determined the membrane and firing properties of fifty-six jaw-elevator motoneurones in rats that were anaesthetized with pentobarbitone, paralysed and artificially ventilated. 2. Forty-two neurones were identified as masseter motoneurones and fourteen as masseter synergist motoneurones. The membrane potentials for the sample ranged from -60 to -86 (mean = -68; S.D. = 7.3; n = 56), and spike amplitudes from 50 to 95 mV. The duration of the after-hyperpolarization following antidromic spikes in masseter motoneurones ranged from 15 to 50 ms (mean = 30; S.D. = 12.8) and their amplitudes from 1.0 to 4.5 mV (mean = 2.7; S.D. = 2.2; n = 42). 3. The mean input resistance for the total sample was 2.3 M omega (S.D. = 0.9; n = 56), membrane time constant 3.9 ms (S.D. = 0.9; n = 48) and rheobase 4.2 nA (S.D. = 2.6; n = 56). The distribution of these parameters was independent of membrane potential. We found no significant interrelationships between the membrane properties and one interpretation of this is that our sample may be drawn from a homogenous population of motoneurones. We also suggest that elevator motoneurones may have a lower Rm (specific membrane resistivity) value than cat hindlimb motoneurones because they have a similar range of input resistance values but only half the total surface area. 4. Forty-six out of forty-nine neurones fired repetitively to a depolarizing current pulse at a mean threshold of 1.6 x rheobase. Current-frequency plots were constructed for thirteen neurones and all but one showed a primary and secondary range in the firing of the first interspike interval. The mean slope in the primary range was 31 impulses s-1 nA-1 and 77 impulses s-1 nA-1 for the secondary range. The mean minimal firing frequency for steady firing was 26 impulses s-1 and, in response to an increase of stimulation, the rate increased monotonically with a slope of 11 impulses s-1 nA-1. 5. The dynamic sensitivity of twelve neurones was assessed from their response to ramp waveforms of current of constant amplitude but varying frequencies (0.2-2 Hz). Firing initially increased along a steep slope up to a frequency of between 40 and 60 impulses s-1 and then increased along a much shallower slope. Both the threshold for eliciting firing and the firing at the transition point of the two slopes remained constant with changes in ramp frequency.(ABSTRACT TRUNCATED AT 400 WORDS)

Action Potentials↗
PubMed1990

Smell and taste function in subjects with chronic obstructive pulmonary disease. Effect of long-term oxygen via nasal cannulas.

It was hypothesized that subjects with chronic obstructive pulmonary disease (COPD) receiving long-term oxygen via nasal cannulas have an impaired sense of smell and/or taste. To objectively evaluate the sense of smell and taste, this study used the University of Pennsylvania Identification Test (UPSIT), a 40-item "scratch-n-sniff" test and a 20-item taste test using the four basic taste sensations of sweet, salt, sour, and bitter. Twenty subjects (15 male, 5 female) with severe COPD receiving long-term oxygen therapy (group 1), and an equal number of age- and sex-matched subjects with COPD not receiving oxygen therapy (group 2), and a healthy control group (group 3) were studied. Twelve subjects (seven male, five female) from group 1 subsequently underwent transtracheal oxygen catheter installation. Mean +/- SD for the basic smell test was significantly greater in group 3 (35.35 +/- 3.58) as compared with group 1 (27.70 +/- 6.07) or group 2 (31.10 +/- 4.95) (p less than 0.005). The difference between group 1 and 2 was not significant (p = 0.066). However, when adjusted for pack years of smoking, there were no significant differences between the three groups. Mean +/- SD correct responses for the basic taste test were significantly greater in group 3 (15.75 +/- 1.81) as compared with group 2 (12.8 +/- 2.78) (p less than 0.005) and group 1 (14.00 +/- 2.33) (p less than 0.05). There was no significant difference between group 1 and 2. The corrected data for taste, adjusted for years since quitting smoking, did not alter the basic differences between the groups. Mean smell and taste test scores were essentially unchanged in 12 subjects after six months of transtracheal oxygen therapy. Long-term oxygen use via nasal cannulas in this group of subjects with COPD did not appear to impair their sense of smell and taste. Smoking had a significant but variable effect on the sense of smell and taste.

Female↗
PubMed1990

The role of ferritin and hemosiderin in the MR appearance of cerebral hemorrhage: a histopathologic biochemical study in rats.

A rat model of cerebral hemorrhage using stereotaxic injection of blood into the right basal ganglia was developed to investigate the influence of iron metabolism on the appearance of cerebral hemorrhage on MR images. Images of in vitro fixed brain sections stained specifically for different iron-storage substances, ferritin and hemosiderin, created by digitization of the pathology sections using an Eikonix CCD camera, were compared with the in vivo MR images of late-phase hematomas. Areas of the pathologic and MR features of the lesions were quantitatively correlated. The single-slice MR images were obtained with the use of T1- and T2-weighted spin-echo pulse sequences, as well as T2-weighted spin-echo pulse sequences in which the 180 degrees refocusing pulse was offset from the center of the echo time; this was termed an asymmetric spin-echo pulse sequence. The symmetric and asymmetric T2-weighted images allowed the calculation of line-width images, which emphasize line broadening from intravoxel magnetic field inhomogeneities that arise from the presence of iron-containing substances. From biochemical and histochemical staining, we conclude that at least two iron-storage substances are present in the late phase of resolving cerebral hematomas. Ferritin has a wider distribution than hemosiderin, showing a similar distribution to the MR signal changes of the calculated line-width images. Line-width mapping is a sensitive means of detecting magnetic field inhomogeneities caused by the magnetic susceptibility differences introduced by the aggregation of these iron-storage substances.

Animals↗
PubMed1990

Community health for the 1990's.

If Primary Health is to work, then health professionals must remove the barriers they have built, or at least not dismantled. Perhaps it is the perception of health professionals that has to change, rather than the expectation of the consumer. Vote: Health money cannot be used to support 'experts' to do their jobs in a way that ignores Primary Health principles and instead supports their profession. Professional jealousies must be eliminated as multi-disciplinary teams build on each other's strengths for the good of the consumer. For after all, we may be health professionals but we are also consumers, we may even become patients. What we know is good for us and our families, should also be good for others. If planned community health honestly puts Primary Health concepts and practices into place and gives them proper and equitable support, resources and finances, then Primary Health can and will work. If community health services allow professionals to carry on paying lip service to Primary Health philosophy but still continue to hold the power and create dependent compliant patients, then we may as well pack up our our journey into the 1990's and stay with the 1940's. It can only work when those with the perceived expertise share it and let it go. Helping people to help themselves by caring and sharing knowledge, skills and resources--that's Primary Health.

Community Health Services↗
PubMed1990

Randomized multicenter trial of cytosine arabinoside with mitoxantrone or daunorubicin in previously untreated adult patients with acute nonlymphocytic leukemia (ANLL). Lederle Cooperative Group.

This phase III, randomized trial in previously untreated adults with ANLL compared mitoxantrone plus cytosine arabinoside with the CALGB "7 + 3" daunorubicin-based regimen. Two hundred evaluable patients (98 treated with the mitoxantrone-based regimen and 102 with the daunorubicin-based regimen) were included in the analysis of efficacy. The median age of the patients was 60 years. The induction regimen comprised cytosine arabinoside 100 mg/m2 by infusion daily for 7 days and mitoxantrone 12 mg/m2 or daunorubicin 45 mg/m2 daily for days 1-3. If needed, a second induction course was administered: cytosine arabinoside for 5 days and mitoxantrone or daunorubicin for 2 days. Postremission therapy consisted of two consolidation courses, identical to the second induction course. Sixty-three percent (62 of 98) of patients treated with mitoxantrone achieved complete remission (CR), compared to 53% (54 of 102) treated with daunorubicin. The median time to CR was 35 days in patients treated with mitoxantrone and 43 days for those treated with daunorubicin. Eighty-nine percent (55 of 62) of patients treated with mitoxantrone who entered complete remission achieved CR following one induction course, compared to 68% (37 of 54) of patients treated with daunorubicin who entered CR. The median duration of CR was 240 days in patients treated with mitoxantrone and 198 days in those treated with daunorubicin; the median length of survival was 328 days in patients who received mitoxantrone and 247 days in those who received daunorubicin. The toxicity profiles in patients treated with either of the two regimens were comparable in incidence and in severity. Patients treated with mitoxantrone required fewer median platelet units and were treated with fewer median days of intravenous antibiotics, compared to those who received daunorubicin. Mitoxantrone in combination with cytosine arabinoside is effective in previously untreated ANLL. complete remissions occur more frequently after a single induction course of the mitoxantrone-based regimen, compared to the standard Cancer and Acute Leukemia Group B regimen. This should be explored in further trials.

Adult↗