Biomedical subjects

R K Stone

Publications and source records attributed to R K Stone.

At least 19 recordsLinked to original sources

PubMed1995

Mucocutaneous fungal colonization in HIV-infected children.

The prevalence of symptomatic mucocutaneous candidiasis in HIV-infected children is well documented. Information, however, of the carriage rate of potential fungal pathogens is lacking. In this study we determined the fungal colonization rate of multiple mucocutaneous sites from 13 HIV-infected and 12 control children. The rate of yeast and mould colonization and the species of fungal isolates were essentially the same for both groups of patients. However, several HIV-infected children asymptomatic for thrush proved to be colonized by Candida albicans, and disseminated colonization with Trichosporon beigelii occurred in one HIV-infected child. All cultures for dermatophytes were negative. While the carriage rate with fungi other than C. albicans was not increased in the HIV-infected group, the isolates recovered are known pathogens in the immunocompromised host and the colonization of these organisms may be a potential source of infection.

AIDS-Related Opportunistic Infections↗

PubMed1989

Lifetime antipsychotic-drug exposure, dyskinesia and related movement disorders in the developmentally disabled.

The relationship between dyskinesia and related movement disorders was examined as a function of cumulative exposure to antipsychotic drugs (APD). Lifetime drug-exposure histories were obtained for 162 developmentally disabled (DD) persons; drug-exposed groups were compared to nondrug-exposed groups. There were no statistically significant relationships between dyskinesia and the amount of lifetime APD exposure, nor between dyskinesia and the number of long-term APDs, mean exposure, peak exposure, recency of exposure, duration of exposure, changes in medication levels, number of drug interruptions, age, gender, cerebral palsy, epilepsy, or IQ. Of the other movement disorders, a positive relationship was noted only between akathisia and long-term APD exposure; the increased prevalence of akathisia persisted beyond four years after APD withdrawal.

Adolescent↗

PubMed1989

Prevalence of dyskinesia and related movement disorders in a developmentally disabled population.

The prevalences and inter-relationships of five types of movement disorders were evaluated in a large, developmentally disabled (DD) population (n = 1227); prevalence was evaluated with regard to severity, age, gender and antipsychotic-drug (APD) exposure. Dyskinesia was found in 48% of the sample, dystonia in 29%, akathisia in 13%, Parkinsonism in 3% and paroxysms in 4%. Many persons had more than one symptom so that 72% had one or more of the five target symptoms. Although the five movement-disorder categories were not mutually exclusive, analysis supported the individuality of the categories as defined in this study. The prevalences of dyskinesia and Parkinsonism were considerably greater than those in the general population. On the other hand, the prevalence of dyskinesia was similar to that reported for psychiatric and institutionalized geriatric populations. Parkinsonism increased with age and male gender, while dyskinesia increased with age and female gender. APD-exposure was significantly correlated only with akathisia.

Adolescent↗

PubMed1989

Gardner syndrome. Early presentation with a desmoid tumor. Discovery of multiple colonic polyps.

A 14-year-old patient who was eventually found to have Gardner syndrome initially presented at the age of 3 years with a desmoid tumor involving the scalp. A careful review of the family history revealed a high incidence of colonic cancer, which prompted endoscopic evaluation of the patient. The discovery of adenomatous polyps in the colon confirmed the diagnosis of Gardner syndrome. In patients with hard or soft tissue tumors, the possibility of Gardner syndrome should be kept in mind, and a thorough family history taken. Early diagnosis may prevent malignant transformation of colonic polyps.

Adolescent↗

PubMed1989

Norwegian scabies in an infant with acquired immunodeficiency syndrome.

A 6-month-old infant with acquired immunodeficiency syndrome (AIDS) and typical scabies subsequently developed Norwegian scabies, with deterioration of clinical status. The infestation spread to several health care workers who were in close contact with the patient, despite standard isolation precautions. In the rapidly growing hospitalized pediatric AIDS population, Norwegian scabies should be considered in the differential diagnosis of eczematous or seborrheic dermatitis.

Acquired Immunodeficiency Syndrome↗

PubMed1989

Prevalence and prediction of psychotropic drug use in California developmental centers.

The extent of psychotropic drug use was evaluated in California's institutionalized developmentally disabled population (N = 6,450). Mean psychotropic drug use was 35.4% for the entire population (range = 13.7% to 63.6% across institutions), with antipsychotic drug use at 26.8% (range = 11.0% to 59.6%). Psychotropic drug use was positively associated with aggression, IQ, depression, and self-injurious behavior, ps less than .0001; it was inversely associated with cerebral palsy and epilepsy. When the influence of demographic and behavioral factors was controlled, significant institutional differences in drug use remained.

Adult↗

PubMed1989

Cosleeping and sleep problems in Hispanic-American urban young children.

To assess whether the traditional pediatric prohibition against cosleeping in the parental bed requires reconsideration for urban ethnic minorities, cosleeping and sleep problems were studied in a sample of Hispanic-American, east Harlem, New York City, children 6 to 48 months of age. The incidence of frequent all-night cosleeping was found to be 21%, significantly higher than the documented rate of 6% found in a representative sample of white middle-American urban children of the same age and sex. For occasional cosleeping, however, there were no significant ethnic differences, and frequent part-night cosleeping was significantly less common than noted in the white sample. There were greater ethnic differences for sharing the parental bedroom compared with cosleeping in the parental bed, approximately 80% for Hispanic-Americans vs 10% for the white population. Within the Hispanic-American group, frequent all-night cosleeping was significantly more common among single parents and those living in multiple households and less common among infants and later-born children in the family. Frequent all-night cosleeping was also significantly associated with sleep problems.

Child, Preschool↗

PubMed1988

Dyskinesia, antipsychotic-drug exposure and risk factors in a developmentally-disabled population.

The relation between antipsychotic drug (APD) exposure and the prevalence of dyskinesia (DK) was examined in a large, developmentally-disabled (DD) population. Using qualitative data in a cross-sectional, retrospective design, the drug-exposed group was systematically compared with a non-drug-exposed group, controlling for age and gender. When the population was evaluated with no regard to APD-exposure, age and female gender were significant risk factors, as in many prior studies. When APD-exposure was considered, it proved to be a complex variable dependent on the recency of exposure to APD, and the outcome depended on the method of analysis: when APD-exposure was considered as a binomial variable (yes/no), the relationship between APD and DK was not significant; when APD-exposure was controlled for recency of exposure, however, a significant relationship between APD and DK was demonstrated (p less than 0.01) although the relationship accounted for less than 3% of the variance. Analysis of the relation between DK-prevalence and recency-of-APD-exposure revealed a pattern of diminished prevalence during APD use and increased prevalence during early withdrawal.

Adolescent↗

PubMed1988

Differentiating the effects of three benzodiazepines on non-REM sleep EEG spectra. A neural-network pattern classification analysis.

Neural-network pattern classifiers were used to study the effects of long half-life flurazepam (30 mg) and quazepam (15 mg), and short half-life triazolam (0.5 mg) on non-REM sleep. We measured the magnitude of effect, time course, and EEG spectral signature of the three benzodiazepines as a function of third-of-night. Of the three benzodiazepines studied, flurazepam had the largest effect and quazepam had the most stable time course. The effects of triazolam were similar to those of quazepam. These EEG differences may prove to be more clinically useful markers than the usual measurement of plasma levels, and may be used to guide the therapy of sleep disorders.

Adult↗

PubMed1987

Teratogenicity of cocaine in humans.

To study teratogenicity of cocaine in humans, we studied three groups of pregnant women and their offspring: group 1, 50 women who abused cocaine only; group 2, 110 women who were polydrug abusers; and group 3, 340 who were drug free. All three groups were similar for socioeconomic status, cigarette smoking, and ethnicity. Maternal age of group 1 was similar to that of group 3, but group 2 mothers were significantly older. Gravidity was significantly higher in groups 1 and 2 compared with group 3. No statistical difference was found in spontaneous abortion rate among the three groups, but the stillbirth rate was significantly higher in group 1 (chi 2 = 6.89, P less than or equal to 0.01). All stillbirths were related to abruptio placentae. Birth weight, length, and head circumference were significantly decreased in infants in groups 1 and 2 compared with group 3 (P less than or equal to 0.0001), but no statistical difference was found between groups 1 and 2. The congenital malformation rate was significantly higher in group 1 compared with group 3 (chi 2 = 7.07, P less than or equal to 0.01). We conclude that cocaine abuse in humans significantly reduces weight of the fetus, increases the stillbirth rate related to abruptio placentae, and is associated with a higher malformation rate.

Abnormalities, Drug-Induced↗

PubMed1987

Fetal alcohol syndrome associated with trisomy 21.

Five cases of Down syndrome in association with fetal alcohol syndrome (FAS) are described. Four of the babies were full term, one was premature. Phenotypically these babies (3M:2F) had manifestations of both Down syndrome and FAS; growth deficiency was more pronounced than is expected in Down syndrome. All measurements, birth weight, length and head circumference were below -2 SD. All had congenital heart disease. Chromosome analysis confirmed 21 trisomy in every case. Down syndrome and FAS may occur together, at random, in 1 in 525,0000 newborns in United States but 1 in 200,000 in our institution. Estimated incidence of FAS and Down syndrome in our institution was 1 in 6,600, a 30-fold increase over the chance occurrence of these two conditions together. Mean age of mothers at delivery was 29.6 +/- 9.3, statistically similar to the mean ages of mothers who delivered Down syndrome and FAS babies in our two hospitals, but was significantly higher than the mean age of mothers in our general population (p less than 0.001). All study cases had chronic alcoholic mothers as well as maternal grandmothers, suggesting that there is an increased incidence of trisomy 21 in children of second generation of alcoholic mothers.

Adult↗

PubMed1987

The influence of socioeconomic factors on the occurrence of fetal alcohol syndrome.

This study was designed to compare manifestations of FAS in the offspring of lower and upper middle class chronic alcoholic mothers, and to compare these offspring with those of nonalcoholic controls. There was highly significant difference in the incidence of FAS offspring between upper middle and lower class alcoholic mothers, 4.5% versus 70.9% respectively. Mean weight, length, and head circumference at birth in children of upper middle class alcoholic women was -ISD, those of lower class alcoholic women fell into -2SD. All other parameters, congenital malformation rate, failure to thrive, mental retardation were also significantly greater in children of lower class alcoholic women (p less than or equal to .01). Attention deficit disorder was found in 21% of upper middle class offspring of alcoholic women as compared to 71% in the children of the lower socioeconomic group (p less than or equal to .01).

Attention Deficit Disorder with Hyperactivity↗

PubMed1987

More on human immunodeficiency virus embryopathy.

Eight patients with acquired immunodeficiency syndrome (AIDS) or AIDS-related complex, ranging in age from 4 to 33 months, were evaluated for the presence of dysmorphic features recently described as human immunodeficiency virus embryopathy. Birth data and growth charts were available. Growth failure, a prominent box-like head, large wide eyes, and a well-formed philtrum were seen in the majority of patients. The significance of hypertelorism, obliquity of eyes, long palpebral fissures, blue scleras, depressed bridge of nose, and prominent upper vermilion border is discussed.

AIDS-Related Complex↗

PubMed1986

Interrater agreement and predictive validity of faculty ratings of pediatric residents.

In the study reported here attending faculty members completed a 14-item rating scale at the end of each clinical rotation in a general pediatrics residency training program. The rating scale items assessed medical knowledge, interpersonal and professional relationships, and attitudes toward education. Significant interrater agreement occurred primarily on those items concerning medical knowledge, and ratings on these items showed significant correlation with the external criterion of scores on the intraining examination of the American Board of Pediatrics. There was also significant interrater agreement for ratings on the item regarding relationship with coworkers. Intercorrelations of ratings on this item with those concerning medical knowledge were relatively low. There was no correlation between scores on the relationship item and subsequent intraining examination scores.

Clinical Competence↗

PubMed1986

Palpable lymph nodes in healthy newborns and infants.

We examined 548 healthy neonates and infants to document the frequency, size, and location of palpable lymph nodes. The subjects consisted of 214 neonates from birth to 4 weeks of age and 334 infants from 4 weeks to 1 year of age. All of the infants were asymptomatic and had been free of major or minor systemic or cutaneous infections in the past. Of the 214 neonates, 73 (34%) had palpable nodes at one or more sites. Of the 334 infants, 190 (57%) had palpable lymph nodes. Inguinal, cervical, and axillary lymph nodes can be palpable in neonates and infants. Supraclavicular nodes are not generally palpable. The commonest site of palpable nodes is the inguinal area in neonates and the cervical area in older infants. It would appear that the palpable nodes noted in the neonatal period do not disappear but persist. This knowledge is useful in determining when adenopathy may be abnormal.

Axilla↗

PubMed1985

Prevalence of partial cerebroside sulfate sulfatase (arylsulfatase A) defect in adult psychiatric patients.

Metachromatic leukodystrophy (MLD) is a disease caused by a deficiency of the enzyme sulfatide sulfatase, also known as arylsulfatase A (ASA). We compared the activity of this enzyme in adult psychiatric patients and normal volunteers using nitrocatechol sulfate (ASA-NCS) and cerebroside sulfate (ASA-CS) as substrates. Our results showed that ASA-NCS activity in urine and leukocytes was significantly lower in psychiatric than in normal individuals, but that there were no differences between these two groups in the sulfatide excretion in urine or the ASA-CS activity in leukocytes. There was no correlation between enzyme activity in urine and in leukocytes, indicating that activity in urine does not truly reflect the levels of the enzyme in tissues. The correlation between ASA-NCS and ASA-CS activity in leukocytes was poor (0.51 for psychiatric patients and 0.59 for normals), suggesting that for a valid measure of the enzyme activity the assays should be carried out with CS as substrate. Results of our study also indicate that in 39 of the 145 psychiatric patients studied, the ASA-CS activity in leukocyte was less than 4 nmoles/mg protein/hr, which is below 50% of the normal means, whereas only one of the 30 normal subjects had a value this low. The presence of low levels of ASA-CS activity in a significantly large number of adult patients with varying psychiatric manifestations suggests that such patients may be asymptomatic carriers of the sulfatidase defect (heterozygotes for MLD), and that behavioral and functional disturbances in these patients may at least in part be related to sulfatidase deficiency. The significance of the ASA-NCS abnormality (reduction) in psychiatric patients is unclear.

Cerebroside-Sulfatase↗

PubMed1985

Assessment of knowledge and clinical judgment in the pediatric residency.

Multiple-choice examinations were given three times each year in a pediatric residency training program. The test scores correlated highly with subsequent scores on the intraining examination of the American Board of Pediatrics. The results were replicated and cross-validated in another study the following year. Use of the local tests and the board examination to evaluate the residents makes it possible to provide continual feedback to the residents regarding the adequacy of their performance and feedback to faculty members regarding the effectiveness of the program. Local test scores can be used to predict the residents' standing on the national examination, and they provide a sound basis for counseling individual residents and for improving specific components of the training program.

Clinical Competence↗

PubMed1985

Palpebral fissure length in black and Hispanic children: correlation with head circumference.

Palpebral fissure length and head circumference were measured in 170 black and 170 Hispanic normal children aged 1 month to 16 years. Eye measurement values were compared with those for white children. It was found that black children have longer palpebral fissures than whites and in certain age groups, than Hispanics. A statistically significant correlation between palpebral fissure length and head circumference was established in black children.

Adolescent↗