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Biomedical subjects

S H Katz

Publications and source records attributed to S H Katz.

At least 19 recordsLinked to original sources
PubMed2001

Misplaced endotracheal tubes by paramedics in an urban emergency medical services system.

STUDY OBJECTIVE: To determine the incidence of unrecognized, misplaced endotracheal tubes inserted by paramedics in a large urban, decentralized emergency medical services (EMS) system. METHODS: We conducted a prospective, observational study of patients intubated in the field by paramedics before emergency department arrival. During an 8-month period, emergency physicians assessed tube position at ED arrival using a combination of auscultation, end-tidal carbon dioxide (ETCO(2)) monitoring, and direct laryngoscopy. RESULTS: A total of 108 intubated patients were studied. On arrival in the ED, 25% (27/108) of patients were found to have improperly placed endotracheal tubes. Of the misplaced tubes, 67% (18/27) were found to be in the esophagus, whereas in 33% (9/27), the tip of the tube was found to be in the hypopharynx, above the vocal cords. Of the patients with misplaced tubes noted in the hypopharynx, 33% (3/9) died while in the ED. For the patients found to have tubes in the hypopharynx, 56% (5/9) had evidence of ETCO(2) on ED arrival. For the patients found to have esophageal tube placement on ED arrival, 56% (10/18) died in the ED. Esophageal intubation was associated with an absence of expired CO(2) (17/18, 94%) on ED arrival. The single patient in this subset with a recordable ETCO(2) had been nasotracheally intubated with the tip of the endotracheal tube noted in the esophagus while spontaneous respirations were present. On patient arrival to the ED, 63% (68/108) of the patients had direct laryngoscopy in addition to ETCO(2) determination. All patients had ETCO(2) evaluation performed on arrival. All patients in whom an absence of ETCO(2) was demonstrated on patient arrival underwent direct laryngoscopy. In cases in which direct laryngoscopy was not performed, the attending physician documented the ETCO(2) in conjunction with the presence of bilateral breath sounds. CONCLUSION: The incidence of out-of-hospital, unrecognized, misplaced endotracheal tubes in our community is excessively high and may be reflective of the incidence occurring in other communities. Data from other communities are needed to clarify the scope of this alarming issue.

Allied Health Personnel↗
PubMed2000

Perceived access to pediatric primary care by insurance status and race.

The Nemours system of children's clinics in Delaware was designed to offer comprehensive primary care (medical homes), to children regardless of families' abilities to pay for services. Racial and insurance status differences in perceptions of access to the provisions of medical home and differences by the Short Medical Home Index are assessed. A probabilities proportionate to size sampling method was used to randomly select families in nine clinics. A total of 323 caregivers of children ages 6 to 48 months were surveyed. Results suggest that there are minimal differences in perceptions of access to provisions of the medical home concept by insurance status and race in the clinics studied. However, when using a composite measure of medical home, differences in perceptions were found. The results suggest that insurance status and racial differences in perceptions of access remain even when the system is specifically designed to provide medical homes without regard to demographic factors. Future studies should focus on improving patient interactions with clinic personnel to ensure that access to provisions of care are understood by all consumers.

Black or African American↗
PubMed2000

Therapeutic drug monitoring of sirolimus: correlations with efficacy and toxicity.

UNLABELLED: We sought to examine the potential benefits of therapeutic drug monitoring of sirolimus, a potent immunosuppressive agent that displays a pleiotropic array of side effects. METHODS: A high-performance liquid chromatography (LC) procedure combined with ultraviolet detection (UV) was used to measure serial concentrations of parent compound sirolimus in 150 renal transplant recipients over a period of 4 yr. Drug concentrations in whole blood at trough time, as well as within pharmacokinetic profiles, were correlated with clinical events using contingency tables, logistic regression analysis, and receiver operating characteristic (ROC) curves. RESULTS: The LC/UV method showed an excellent correlation with detection of LC-resolved components by tandem mass spectrometry, demonstrating that the LC/UV method selectively detected parent compound. Sirolimus displayed the characteristics of a critical-dose drug: Its concentration could not be predicted by a standard body or demographic measure, or by dose, and it showed high degrees of intra- and inter-individual variability. However, there was a good correlation between trough and area-under-the-curve measurements. There was a significant association between trough values expressed as either observed ( < 5 ng/mL) or dose-corrected parameter ( < 1.7 ng/mL per mg administered drug) and the occurrence and severity of acute rejection episodes - despite the low overall incidence of 23 episodes among the cohort of 150 patients. Similarly, ROC functions showed a correlation of the occurrence of hypertriglyceridemia, thrombocytopenia, and leukopenia, but not hypercholesterolemia, with trough concentrations above 15 ng/mL. CONCLUSION: Due to its behavior as a critical-dose drug, therapeutic monitoring to measure sirolimus concentrations by a LC/UV method may provide clinicians with a tool to optimize outcomes.

Adolescent↗
PubMed2000

Early risk factors for increased adiposity: a cohort study of African American subjects followed from birth to young adulthood.

BACKGROUND: Obesity is an increasing concern in the United States. Effective prevention of obesity requires the risk factors to be well defined. African Americans have a high risk of obesity. OBJECTIVE: The objective of this study was to identify risk factors, present at birth, for increased adiposity in adulthood in an African American population. DESIGN: In this retrospective analysis of a prospective cohort study, anthropometric and socioeconomic variables were collected at birth. A representative sample of 447 African American subjects was followed up until young adulthood, when skinfold thickness was measured. Associations between the independent variables and increased adiposity (skinfold thickness above the 85th percentile) were explored by using unadjusted and adjusted analyses. RESULTS: Three variables measured at birth were independently associated with adiposity in young adulthood, explaining 12% of the variance. The odds ratios (with 95% CIs) of these variables for increased adiposity were 2.7 (1.2, 6.2) for female sex, 4.0 (1.4, 11. 2) for first-born status, and 1.15 (1.06, 1.25) for each unit increment in maternal prepregnancy body mass index (BMI; in kg/m(2)). After adjustment for these variables, birth weight for gestational age and socioeconomic variables were not associated with adiposity. CONCLUSIONS: This cohort study of African American subjects was the first to identify first-born status as an independent risk factor for increased adiposity in adulthood in a US population. The results of the study strengthen previous reports of the effect of female sex and maternal BMI on adulthood obesity. Identification of risk factors early in life may help target prevention toward high-risk children and allow healthy lifestyles to be established before the onset of obesity.

Adolescent↗
PubMed2000

The impact of a pediatric medical home on immunization coverage.

This study assessed whether having access to provisions in the American Academy of Pediatrics "medical home" concept was associated with being age-appropriately immunized at 3, 12, and 24 months. Cross-sectional data on 495 Delaware children were collected from June 1994 to June 1995. Immunization status was determined with the Delaware immunization registry. The medical home was not significantly associated with immunization coverage. This study confirms that race, insurance status, maternal education, and family incomes are predictive of having poor immunization outcomes. Simply providing medical homes may not be an effective strategy to improve use of preventive services.

Child, Preschool↗
PubMed1999

A phase I study of a 4-week course of SDZ-RAD (RAD) quiescent cyclosporine-prednisone-treated renal transplant recipients.

BACKGROUND AND METHODS: This phase I, randomized, blinded, placebo-controlled study assessed the safety profile and pharmacokinetics of a 4-week course of once-daily, sequential ascending doses (0.75, 2.5, or 7.5 mg/day) of SDZ-RAD (RAD) capsules in renal transplant recipients on a stable regimen of cyclosporine (CsA; Neoral) and prednisone. RESULTS: RAD displayed a similar spectrum of side effects as observed with rapamycin, namely, an increased incidence of infection associated with the augmented immunosuppression and a dose-related occurrence of thrombocytopenia, hypercholesterolemia, and hypertriglyceridemia, particularly at the 7.5-mg dose. The pharmacokinetic parameters of RAD showed dose proportionality, a good correlation between trough and area under the curve (AUC) concentrations, and a moderate accumulation of 2.5-fold. The drug was absorbed within 2 hr and displayed a 16-19-hr half-life, which is shorter than that of rapamycin. RAD reached steady state at 4 days. Preliminary kinetic-dynamic correlations indicate a correlation between thrombocytopenia (but not hyperlipidemia) and AUC, as well as maximum drug concentrations, and weight-adjusted dose. At the end of a 4-week course of simultaneous dosing, there was no evidence of a pharmacokinetic interaction between CsA and RAD. CONCLUSION: This study suggests that the shorter half-life of RAD compared to rapamycin may confer the benefits of rapid attainment of steady state and dissipation of effects upon drug cessation. Controlled, multicenter trials are being planned to assess the impact of these features on clinical outcomes.

Adult↗
PubMed1997

Diagnosis and assessment of depression and suicidality using the NIMH Diagnostic Interview Schedule for Children (DISC-2.3).

The diagnostic Interview Schedule for Children (DISC-2.3) was studied in a sample of 265 adolescent inpatients to determine type and concurrent validity of depressive symptoms and depressive disorder diagnoses for different DISC-2.3 informants (parent, adolescent, both). The Children's Depression Rating Scale--Revised, Reynolds Adolescent Depression Scale (RADS), Suicide Ideation Questionnaire--Junior, Spectrum of Suicide Behavior Scale, and clinical consensus diagnoses were used to assess concurrent validity. Results indicated that (1) parents, compared to adolescents, reported a higher prevalence of all depressive symptoms with the exception of weight change; (2) DISC-2.3 depressive and suicidality symptoms were related positively to independent validating criteria for all informant conditions, suggesting good concurrent validity; (3) the DISC-2.3 both informant condition correctly identified the most depressive disorders; and (4) the parent, but not the adolescent, DISC-2.3 Informant condition contributed to the prediction of clinical consensus diagnoses of depression after taking into account RADS scores.

Adolescent↗
PubMed1997

Comparing a computer-based childhood vaccination registry with parental vaccination cards: a population-based study of Delaware children.

We conducted a population-based study in Delaware to examine the reliability of childhood vaccination data in a comprehensive computer-based record system versus parental vaccination cards. We sampled 1,005 children born between January, 1991, and September, 1993. We oversampled for children whose mothers received Medicaid or were uninsured at the time of delivery. Of the survey responders, 276 (56%) had access to written records, and 409 (83%) records were located in the Delaware immunization computer database. The kappa coefficient was 0.18. The observed agreement was 59.8%. When the two databases were combined, the up-to-date rate for 2-year-olds was 58.4%, an increase of 12.7% and 24.2% from the computer database and the parental records, respectively. The computer database was 78.1% sensitive and the parental records were 54.9% sensitive. These results indicate that a comprehensive computer-based record system, with adequate provider participation and proper data management, can be more reliable than parental vaccination cards.

Child↗
PubMed1995

Monitoring growth during orthodontic treatment.

The relationship between somatic growth and orthodontic treatment has been limited to the evaluation of body height and skeletal age relative to craniofacial development. The aim of this study was to evaluate the correlation of anthropometric and biochemical measures of general growth with facial and occlusal changes during the early treatment of Class II Division 1 malocclusion. Findings are reported from 46 children, ages 7.20 to 12.85 years (skeletal ages, 5.75 to 12.75 years), who are enrolled in a prospective clinical trial. Body and knee heights were measured monthly, with a Holtain stadiometer and a Knee Height Measuring Device, respectively. Every three months, serum levels were measured of the hormone dehydroepiandrosterone sulfate (DHEAS), an androgen associated with growth in midchildhood, and osteocalcin, an indicator of bone turnover. Significant correlations existed between knee height and various occlusal measurements, but mandibular length was not significantly correlated with knee height and DHEAS levels. Knee height correlated significantly (P < .05) with DHEAS and osteocalcin only in 46% and 37% of the children, respectively. The results indicate that the evaluated biochemical measures, at the time intervals considered, may not increase the accuracy of growth depiction by physical measures alone (height and skeletal maturation).

Anthropometry↗
PubMed1986

The contribution of adrenal and gonadal androgens to the growth in height of adolescent males.

Gonadal androgens are known to regulate the rate of growth in height during adolescence, particularly in males, but little is known of the role of adrenal androgens in this process. In a prospective multiple regression model we show that both adrenal and gonadal androgens contribute to the increasing rate of growth in height prior to peak height velocity and the decreasing rate of height growth in later adolescence. Since adrenal androgen secretion begins in mid-childhood, long before gonadal maturation and the secretion of testicular androgens, these findings may prove helpful in explaining population variation in adolescent growth.

Adolescent↗
PubMed1986

Blood pressure, body fat, and dehydroepiandrosterone sulfate variation in adolescence.

Several significant interrelations among variation in blood pressure, body fat, and adrenal androgen levels, as assessed by serum dehydroepiandrosterone sulfate concentrations, were found in black male and female adolescents, aged 12 to 16 years. In girls, high levels of dehydroepiandrosterone sulfate were associated with significantly higher levels of blood pressure (alpha = 0.05), even after adjusting for the significant association between increased levels of dehydroepiandrosterone sulfate and body fat. The increased body fat (i.e., body mass index) found with higher levels of dehydroepiandrosterone sulfate in girls was related to significantly greater (alpha = 0.05) accumulations of fat in the upper trunk, as opposed to the limb. In boys, high levels of serum dehydroepiandrosterone sulfate, low body mass index, and significantly higher blood pressure were interrelated (alpha = 0.05). In addition to the interaction of increased body mass index or body fat and increased levels of dehydroepiandrosterone sulfate in association with higher blood pressure, high levels of the adrenal androgen, even in boys with low body mass index, were associated independently with relatively higher blood pressure. Body proportion analyses for these boys indicated that they were tall and thin, in contrast to the other boys with low body mass index, who were generally short and thin.

Adipose Tissue↗
PubMed1985

Pulse rate, blood pressure and body composition in black adolescents: the Philadelphia Blood Pressure Project.

Patterns of pulse rate, blood pressure (BP), and body size and composition are investigated in a black urban sample of over 600 adolescents (aged 12-17) in Philadelphia as part of the Philadelphia Blood Pressure Project. Supine and seated pulse rates decline after the age of 13 in both males and females, and females have significantly higher pulse rates than males, ranging from 1.6 to 4.7 beats/30 sec higher depending upon chronological age and position. Seated pulse rates are consistently higher than supine in both sexes ranging from 1.3 to 2.9 beats/30 sec depending upon chronological age. Pulse rate and both systolic blood pressure (SBP) and diastolic phase IV blood pressure (DBP) show a positive association throughout adolescence for females (r = 0.16 SBP, r = 0.24 DBP) but not for males (r = -0.06 SBP, r = 0.06 DBP). Females in the highest diastolic IV blood pressure stratum (greater than 85%) maintain higher pulse rates throughout adolescence, while males with the highest DBP have higher pulse rates in early adolescence (ages 12-14) but lower pulse rates in later adolescence (ages 16 and 17). Females with the highest DBP also show consistently higher measures of relative fatness (triceps skinfolds) throughout adolescence. Males with the highest DBP have greater triceps skinfolds in early adolescence and lower triceps in later adolescence, a pattern similar to that shown for pulse rate. For DBP, triceps is significantly and positively associated with pulse rate in the upper DBP percentile group (p less than 0.05). Thus, females with the highest blood pressure during adolescence are characterized by higher pulse rate and greater fatness. Males show this same pattern in early adolescence; whereas, in contrast, the older adolescent males in our sample with the highest DBP are characterized by lower pulse rates, relatively decreased fatness, and increased muscularity. Our findings suggest that, at least in some older black male adolescents, a higher DBP may reflect a decrease in cardiac output as indicated by a lower pulse rate, or an increase in peripheral vascular resistance, possibly associated with relatively decreased fatness and increased muscle mass for size.

Adolescent↗
PubMed1984

Resting blood pressure and pulse rate distributions in black adolescents: The Philadelphia Blood Pressure Project.

Reference percentile distributions for blood pressure in black adolescents are not generally available. The most recently published BP percentile grids for children and adolescents were derived almost exclusively from information on white populations, and few data are available on the distribution of pulse rate for black adolescents. Reference percentiles for black adolescents for resting BP and 60-second pulse rate are presented. Given the tendency for high BP levels to track, these reference percentiles may be of value in determining the extent to which black adolescents are at risk for hypertensive disorders in adulthood. The percentiles were derived from a 3-year longitudinal study of black, urban Philadelphia adolescents, aged 12 to 17 years. Confirming results from studies of other populations in adolescence, a trend was found toward increased mean systolic BP for boys (P less than .001), and that boys have significantly higher (P less than .001) systolic BP than girls after chronologic age 15 years. Diastolic BP phase IV (muffling) exhibits no age or sex trends from ages 12 to 17 years, but adolescent girls overall have significantly higher (P less than .001) phase V diastolic (disappearance) than boys. Sixty-second pulse rate declines for both boys and girls in adolescence, although at every age 60-second pulse rate means are significantly faster in girls than boys (P less than .02). For girls older than 12 to 17 years, there is a significant, positive correlation between pulse rate and systolic BP (r = .16, P less than .01) and between pulse rate and phase IV diastolic (r = .23, P less than .01).(ABSTRACT TRUNCATED AT 250 WORDS)

Adolescent↗