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Biomedical subjects

D C Taylor

Publications and source records attributed to D C Taylor.

At least 109 records · Page 6Linked to original sources

Behavioral consequences of epilepsy in children. Developing a psychosocial vocabulary.

In this chapter we have described some of the experiences of a special psychiatric clinic for children with epilepsy, drawing our examples from a series of 50 children. The behavioral consequences of epilepsy cannot be adequately described within the limited nosology available for classifying the behavior disorders of children. As an alternative, a series of behaviors which children actually require in order to maintain their social existence have been identified; furthermore, impairments of those behaviors have been pointed to, and consequences of these behavioral impairments have been outlined. The behavioral consequences of epilepsy are often multiple and are sometimes mutually interactive. The extent to which these behavioral deviations depend both upon the exhibition of seizures and the presence of structural abnormalities in the brain is made most evident by the marked changes in behavior which can be achieved when epilepsy is relieved and a lesion is removed. Unfortunately, such a stratagem is not available to the majority of children with epilepsy. For the time being, their cerebral impairment and the continuation of their epilepsy have to be taken for granted, and intervention then consists of the best possible management of their impairments and their distressing behaviors. Such management clearly requires psychiatric and psychological skills, although these skills do not necessarily lead to greater success than does the use of anticonvulsants or the use of surgery. Success is not an adequate measure of the appropriateness of the endeavor. It goes without saying that not all children with epilepsy suffer behavioral consequences along these lines, and indeed behavioral disturbances were not universal even in this highly selected series. Some children were seen merely as a way of improving their medical status or achieving surgical treatment. These more traditional medical maneuvers are easier to undertake and are more understandable to parents than are complex strategies of psychiatry. In any event, parents deserve considerable support. The language of psychiatry for children with organic cerebral impairments is extremely limited; this chapter has been an attempt to improve our vocabulary, which will be a necessary underpinning in order to improve the quality of our classification. Finally, we return to Bridge's statement. Firstly, we do not regard epilepsy as a disease any more than we would regard cough as a disease, and we find that orientations in that direction are likely to thwart our attempt at piece-by-piece dismantling of the many sorts of disease which might be associated with seizures.(ABSTRACT TRUNCATED AT 400 WORDS)

Adaptation, Psychological↗

A simple enzymatic method for the preparation of radiolabeled erucoyl-CoA and other long-chain fatty acyl-CoAs and their characterization by mass spectrometry.

A simple two-step method for the biosynthesis of radiolabeled erucoyl-coenzyme A of high specific activity and other long-chain fatty acyl-coenzyme A (acyl-CoA) thioesters is reported. 1-14C-labeled erucic and oleic acids, as well as unlabeled ricinoleic and nervonic acids, were incubated at 35 degrees C with coenzyme A in the presence of ATP, MgCl2, and acyl-CoA synthetase (EC 6.2.1.3) from Pseudomonas spp. to yield the corresponding CoA thioesters. Following incubation, each thioester was purified by rapid passage through a disposable reverse-phase C18 extraction column. The overall yields were greater than 90% and the purities greater than 95%, based on the distribution of radioactivity, and chromatographic and spectral properties. Fast ion bombardment-mass spectrometry was employed to confirm the structures of the various acyl-CoAs.

Acyl Coenzyme A↗

Peripheral psychophysiological reactivity to mental tasks in children with psychiatric disorders.

Peripheral psychophysiological reactivity (skin conductance and heart rate changes) to mental activity tasks (imagery and listening to music) was examined in child psychiatric day or in-patients with conduct and emotional disorders. Children with predominant antisocial symptomatology showed higher electrodermal than cardiovascular reactivity to the experimental tasks, whilst children with predominant neurotic symptoms showed more marked cardiovascular reactivity. No statistical differences between the groups emerged in response to listening to music, but antisocials were more responsive (with higher skin conductance level increases) to imaging pleasant situations, whereas neurotics were more reactive (increased heart rate levels and decreases in skin conductance) to imaging unpleasant situations. The results are compatible with an enhanced biological responsiveness by antisocials to reward and with neurotics experiencing an unusually marked sense of threat and withdrawal to aversive stimuli.

Affective Symptoms↗

Inhibition of adhesion of Haemophilus influenzae to buccal cells by respiratory secretions.

The ability of salivary secretions and sputum sol from patients with chronic bronchitis to inhibit the adhesion of non-serotypable Haemophilus influenzae to human buccal epithelial cells has been examined. Specific H. influenzae antibodies were measured by an enzyme-linked immunosorbent assay (ELISA). Saliva and sputum levels of anti-H. influenzae immunoglobulin A (IgA) antibody were related inversely to buccal cell adherence (r = -0.92). Absorption of saliva and sputum sol with H. influenzae removed antibody detected by ELISA but only partially removed inhibition of attachment of bacteria. In patients with a history of recurrent bronchitis significantly more inhibitory activity remained after absorption of the secretory IgA (sIgA) specific antibody compared with patients who were resistant to acute episodes of infection (P less than 0.05). These observations suggest that factors, other than sIgA, are present in respiratory secretions and are capable of modulating H. influenzae attachment to buccal epithelial cells.

Adult↗

Evaluation of a selective medium for the isolation and differentiation of Haemophilus influenzae and Haemophilus parainfluenzae from the respiratory tract of chronic bronchitics.

Respiratory tract specimens from chronic bronchitic patients were cultured for Haemophilus species on conventional chocolate agar and a modified sucrose medium in order to determine the accuracy of the new medium in differentiating Haemophilus influenzae from Haemophilus parainfluenzae strains. Haemophilus influenzae biotypes II and III and Haemophilus parainfluenzae biotypes I and II were found to be the predominant strains isolated from the respiratory tract. The modified sucrose medium was found to be a rapid and reliable means of differentiating Haemophilus influenzae from Haemophilus parainfluenzae by sucrose fermentation, on initial isolation.

Bronchitis↗

Evaluation of mesenteric and renal vascular disease.

Accurate evaluation of the mesenteric and renal circulations by methods other than angiography has been difficult. Duplex ultrasound scanning has recently been applied to these areas and has potentially important clinical applications. In the renal circulation it has use in selected patients with hypertension for detection of renal artery stenosis. It also can be used to assess the technical adequacy and long-term results of renal revascularization and may be helpful in the evaluation of renal transplants. In the mesenteric circulation duplex ultrasound is useful in evaluating patients with suspected chronic mesenteric insufficiency, in the serial assessment of mesenteric revascularization, in the evaluation of portal hypertension both prior to and following portosystemic shunting, and in the assessment of hemodynamic aspects of gastrointestinal physiology.

Arteriosclerosis↗

The use of behavior therapy and physical therapy to promote independent ambulation in a preschooler with mental retardation and cerebral palsy.

This study investigated the effectiveness of an instructional program designed to promote independent walking in a mentally and physically handicapped pre-schooler involving a collaborative effort between a behavior therapist and a physical therapist in an interdisciplinary setting, a public school. By letting the youngster experience a treatment package culminating in listening to a dishwasher operating for a few minutes contingent on walking increasingly longer distances, he eventually ambulated 150 feet during treatment. Independent walking transferred to nonexperimental settings in the school, home, and community. Follow-up observations at two and 32-month intervals indicated long-lasting treatment effects. Results are discussed in terms of the natural consequences that maintained walking, including response efficiency and social reinforcement, as well as a treatment model that incorporated both the form and the function of the response.

Behavior Therapy↗

Asymptomatic high-grade internal carotid artery stenosis: is stratification according to risk factors or duplex spectral analysis possible?

High-grade (80% to 99% diameter reduction) asymptomatic internal carotid artery stenoses are associated with an increased neurologic event rate (transient ischemic attack, stroke, asymptomatic internal carotid artery occlusion) compared to less severe asymptomatic lesions. However, many do remain free of associated events. To determine which are most dangerous, we compared risk factors and duplex scan results in two groups with asymptomatic high-grade internal carotid artery stenoses. Group A included 31 patients with 33 unoperated high-grade lesions that remained asymptomatic for at least 12 months (mean 30 months). Group B included 25 patients with 26 initially asymptomatic lesions that subsequently were associated with a neurologic event (mean time to event 7.4 months). The groups did not differ significantly in average age, sex, aspirin use, smoking, or prevalence of hypertension, diabetes, or cardiac disease. With respect to the index high-grade lesion, there was no difference in the frequency of a greater than 50% contralateral internal carotid artery stenosis or greater than 50% ipsilateral external carotid stenosis. However, on duplex scanning, high-grade stenoses with greater than 6.5 kHz end-diastolic frequencies were more frequently associated with an event than high-grade lesions with lower end-diastolic frequency (p = 0.0004). Similarly, seven of 23 lesions (30%) with end-diastolic frequency greater than 6.0 kHz were associated with subsequent internal carotid artery occlusion compared to only one of 29 (3.5%) with end-diastolic frequency less than or equal to 6.0 kHz (p = 0.025). Analysis of internal carotid artery end-diastolic frequency may help select a subgroup of patients with asymptomatic high-grade lesions who are at greatest risk for subsequent neurologic symptoms or ICA occlusion or both.

Aged↗

Follow-up of renal artery stenosis by duplex ultrasound.

We have previously shown that duplex ultrasound is an accurate method of diagnosing renal artery stenosis (93% accuracy compared with angiography in the diagnosis of less than 60% stenosis, 60% to 99% stenosis, or occlusion). With this method we have now serially observed 35 renal arteries with 60% to 99% renal artery stenosis in 27 patients. Nineteen stenotic renal arteries in 15 patients were observed without intervention. There was a significant decrease in kidney size (mean difference - 1.0 cm; p less than 0.01; mean follow-up 13 months) but all 19 renal arteries remained patent. Percutaneous transluminal angioplasty (PTA) was performed in five patients (six renal arteries) for renovascular hypertension. Renal duplex scanning documented relief of renal artery stenosis in two patients whose hypertension improved after PTA and confirmed residual 60% to 99% renal artery stenosis in three patients whose hypertension did not improve after PTA (mean follow-up 6.5 months). Aortorenal bypass was performed for 10 stenotic renal arteries in seven patients. At a mean follow-up of 9 months duplex ultrasound documented eight patent and two occluded aortorenal bypass grafts. Duplex ultrasound is useful both for defining the natural history of untreated renal artery stenosis and assessing the results of renal artery angioplasty or bypass.

Angioplasty, Balloon↗

Duplex ultrasound measurement of postprandial intestinal blood flow: effect of meal composition.

Duplex ultrasound was used to evaluate the effects of 350-cal, 300-ml protein, fat, carbohydrate, and mixed (Ensure-Plus) liquid meals on celiac, superior mesenteric, and femoral artery blood flow in 7 healthy volunteers. Ingestion of separate water and mannitol solutions served as controls for volume and osmolarity. Duplex parameters of peak systolic velocity, end-diastolic velocity, mean velocity, and volume flow were determined before, and serially for 90 min after, ingestion of each test meal. Maximal changes were compared with baseline values. There were no significant changes in any of the blood flow parameters derived from the celiac or femoral arteries after any test meal ingested. In contrast, maximal changes in all superior mesenteric artery parameters were increased significantly over baseline (p less than 0.05) after each of the test meals except water, with end-diastolic velocity showing proportionally the greatest increase. The study demonstrates that duplex ultrasound can provide a noninvasive means of studying the reactivity of the splanchnic arterial circulation to different stimuli and documents differing blood flow responses to variation of nutrients.

Adult↗

Crush syndrome complicating pneumatic antishock garment (PASG) use.

We present a case of severe compartment syndrome complicated by rhabdomyolysis and acute renal failure (crush syndrome) following the use of a pneumatic antishock garment (PASG) with survival of the patient. Review of the literature reveals one other similar case but without survival. The aetiology of the complication is discussed and recommendations for the safe use of the PASG are made.

Adult↗

Overflow movements and cognitive, motor and behavioural disturbance: a normative study of girls.

This study established norms for overflow movements of girls on the Modified Fog Test (MFT) of neurological function and investigated the relationship between high levels of overflow and behavioural and cognitive measures. 193 girls aged seven to 10 years, from suburban and inner-city areas, were examined for overflow, co-ordination and handedness, and completed cognitive and reading tests. Teachers' assessments of performance and behaviour at school were obtained and the parents of 147 girls were interviewed about developmental history, psychosocial situation and current behaviour. As predicted, there was a highly significant reduction in the amount of overflow with increasing age. Left-handed girls showed more overflow on the right side, in contrast to right- and mixed-handed girls. Girls in a combined group of 'poor performers' on the MFT were significantly more likely to show behaviour problems at school, and to be judged poor scholastically. They had significantly lower reading scores, were judged poor at handwriting and school sport, and scored lower on the Gubbay clap and catch task.

Brain Damage, Chronic↗

Biotyping respiratory Haemophilus species with the microbact system.

The biochemical characteristics of 114 respiratory Haemophilus isolates were examined by the Minitek and Microbact systems. The Microbact system was easy to use and read, although some of the less important reactions (glucose and xylose) were difficult to interpret on occasions. On the basis of the 3 crucial reactions--indole production, ornithine decarboxylase and urease activity--discrepancies between the two systems were minor. Given careful standardization of techniques the Microbact system is a suitable alternative to established techniques for the biotyping of H. influenzae and H. parainfluenzae.

Bacterial Typing Techniques↗