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Biomedical subjects

K Harden

Publications and source records attributed to K Harden.

13 recordsLinked to original sources
PubMed2001

Developmental follow-up in 15-month-old infants of asthmatic vs. control mothers.

The purpose of this study was to evaluate mental and psychomotor development in infants of mothers whose asthma was actively managed during pregnancy and to compare the results with those froms infants of non-asthmatic mothers. Bayley Scales were assessed at age 15 +/- 3 months in 379 infants of asthmatic mothers and 376 control infants. Relationships were assessed between developmental indices and asthma severity, socioeconomic status, and infant prematurity. No significant differences in developmental indices were observed between infants of asthmatic mothers and control infants. No relationships were identified between developmental indices and maternal asthma severity. In the infants of both asthmatic and control mothers, a lower mean psychomotor developmental index was associated with birth weight < 2,500 g, and a lower mental developmental index with lower socioeconomic status. Hence, infants of asthmatic mothers whose asthma has been actively managed during pregnancy have developmental outcomes at 15 months of age that are similar to those of control infants.

Adult↗
PubMed2000

The relationship of maternal personality characteristics to birth outcomes and infant development.

BACKGROUND: Previous studies reported an association between maternal psychological factors and adverse pregnancy outcomes. The objective of this study was to evaluate the relationships between maternal personality characteristics, as determined by the Minnesota Multiphasic Personality Inventory (MMPI), and infant birth outcomes and development. METHOD: The inventory was administered during pregnancy to 638 pregnant women enrolled in a staff model health maintenance organization. MMPI validity as well as clinical and research scales were evaluated in relationship to infant birth outcomes (low birthweight, preterm birth) and 15-month-old infant development as assessed by the Bayley Scales of Infant Development. RESULTS: Mothers of low birthweight infants scored significantly lower on the hypochondriasis scale, a relationship which was no longer significant after controlling for ethnicity. No other relationships were observed between infant birth outcomes and maternal MMPI scale scores. A higher infant Mental Developmental Index (MDI) was related to higher maternal masculinity-femininity and ego-strength scale scores and lower lie and hypochondriasis scale scores. Only the relationship between infant MDI and maternal masculinity-femininity scale score remained significant after controlling for ethnicity and socioeconomic index (beta = 0.104, p = 0.036). CONCLUSIONS: Maternal personality characteristics, as determined by the MMPI, did not appear to be significantly related to the occurrence of preterm birth or low birthweight in this healthy, general population. Maternal personality characteristics reflected in the MMPI masculinity-femininity scale appeared to be related to infant mental development, above and beyond the effects of socioeconomic status and ethnicity.

Adaptation, Psychological↗
PubMed1999

Soy allergy in infants and children with IgE-associated cow's milk allergy.

OBJECTIVES: To determine the prevalence of soy allergy in IgE-associated cow's milk allergy (CMA). STUDY DESIGN: Children <3.5 years with documented IgE-associated CMA (n = 93) were evaluated for soy allergy by double-blind, placebo-controlled food challenge, open challenge, or convincing previous history of an anaphylactic reaction to soy. Children tolerant to soy at entry received soy formula and were followed up for 1 year. RESULTS: Of this IgE-associated CMA cohort (ages 3 to 41 months), 14% (95% CI = 7. 7%-22.7%) were determined to have soy allergy, 12 definitely at entry and 1 possibly after 1 year of soy ingestion. The latter child experienced severe failure to thrive at enrollment and exhibited improved growth while receiving soy during follow-up but was diagnosed with eosinophilic esophagitis at study completion. Improved growth (P <.05) occurred in the non-soy-allergic cohort ingesting soy formula (579 31 mL/d) during the year of follow-up. CONCLUSIONS: Soy allergy occurs in only a small minority of young children with IgE-associated CMA. As such, soy formula may provide a safe and growth-promoting alternative for the majority of children with IgE-associated CMA shown to be soy tolerant at the time of introduction of soy formula.

Child, Preschool↗
PubMed1997

The safety of asthma and allergy medications during pregnancy.

BACKGROUND: Although no asthma or allergy medications can be considered proven safe for use during pregnancy, these medications are often used to prevent the potential direct and indirect consequences of uncontrolled asthma or allergy. OBJECTIVE: The safety of asthma medications, antihistamines, and decongestants was assessed in a prospectively monitored cohort of 824 pregnant women with and 678 pregnant women without asthma. METHODS: Medications used since conception were recorded on each subject's initial visit (< 28 weeks' gestation). Thereafter, diary cards for medications were completed by the patient through the time of delivery. Perinatal outcomes were compared in exposed versus unexposed individuals. A multivariate analysis accounted for the potential effects of age, parity, smoking, race, weight gain during pregnancy, maternal pulmonary function, acute asthmatic episodes, and multiple medication exposure. RESULTS: No significant relationships were identified between major congenital malformations and first trimester or any exposure to beta-agonists, theophylline, cromolyn, corticosteroids, antihistamines, or decongestants. In the multivariate analyses, oral corticosteroids were independently associated with preeclampsia (odds ratio = 2.0, p = 0.027), but no other independent associations were observed between asthma or allergy medications and adverse perinatal outcomes. CONCLUSION: Use of most common asthma and allergy medications during pregnancy was not associated with increased perinatal risks. Maternal use of oral corticosteroids was independently associated with the occurrence of preeclampsia in this study, although the mechanism of this association is not clear. However, because prior observations suggest that severe asthma may be associated with maternal and/or fetal mortality, risk-benefit considerations still favor the use of oral corticosteroids when indicated for the treatment of asthma during pregnancy.

Administration, Inhalation↗
PubMed1996

Uridine nucleotide selectivity of three phospholipase C-activating P2 receptors: identification of a UDP-selective, a UTP-selective, and an ATP- and UTP-specific receptor.

Observation that the G protein-coupled P2U receptor (P2Y2 receptor) is activated by UTP as well as ATP provided the first indication that a class of uridine nucleotide-responsive receptors might exist. This hypothesis was confirmed by our identification of a uridine nucleotide-specific receptor on C6-2B rat glioma cells and by the recent cloning of two uridine nucleotide-responsive receptors, the P2Y6 receptor [J. Biol. Chem. 270:26152-26158 (1995)] and the P2Y4 receptor [J. Biol. Chem. 270:30849-30852 (1995) and J. Biol. Chem. 270:30845-30848 (1995)]. The relative nucleotide selectivities of these uridine nucleotide-activated receptors have not been established. Therefore, we cloned and expressed the P2Y6 and P2Y4 receptors in 1321N1 human astrocytoma cells and compared their relative selectivities for UDP, UTP, and other uridine and adenine nucleotides with that of the P2Y2 receptor expressed in the same cells. These comparisons were made by measuring inositol phosphate accumulation under conditions in which the initial purity and stability of agonists were rigidly ensured and quantitatively assessed. The data indicate that the P2Y2 receptor is activated with similar potencies by ATP and UTP but not by ADP or UDP; the P2Y6 receptor is activated most potently by UDP but weakly by UTP, ATP, and ADP; and the P2Y4 receptor is activated most potently by UTP, less potently by ATP, and not at all by nucleotide diphosphates. Furthermore, the P2Y6 receptor, which displays a uridine nucleotide selectivity essentially identical to that of the uridine nucleotide-specific receptor in C6-2B cells, was shown to be natively expressed in C6-2B cells and to account for the uridine nucleotide responses originally identified in these cells. These results define the uridine nucleotide selectivity of three phospholipase C-linked receptors: a receptor that is selectively activated by UDP (P2Y6 receptor), selectively activated by UTP (P2Y4 receptor), and activated by UTP and ATP but not by diphosphate nucleotides (P2Y2 receptor).

Adenosine Triphosphate↗
PubMed1995

Perinatal outcomes in the pregnancies of asthmatic women: a prospective controlled analysis.

Prior studies have found an increased incidence of adverse perinatal outcomes of pregnancies in asthmatic mothers, but these studies have been poorly controlled for asthma therapy and other confounding factors. The purpose of this study was to assess perinatal outcomes in actively managed pregnant asthmatic women as compared with matched nonasthmatic controls. Using an inception cohort design, we studied a volunteer sample of 486 pregnant (< 28 wk) women with documented asthma and 486 pregnant nonasthmatic controls with normal pulmonary function. Cases and controls were matched for age, smoking status, parity, and year of delivery. Asthma was managed with step therapy to prevent acute asthmatic episodes and asthma symptoms that interfered with sleep or normal activity. Chronic hypertension was significantly more common (p = 0.007) in asthmatic subjects (3.7%) than in matched controls (1.0%). However, no significant differences in incidences of preeclampsia, perinatal mortality, preterm births, low-birth-weight infants, intrauterine growth retardation, or congenital malformations were observed in the pregnancies of the asthmatic women as compared with the matched controls. Trends were observed toward relationships between more severe asthma requiring emergency therapy or corticosteroids and increased incidences of preeclampsia and low-birth-weight infants, but these associations were not statistically significant. These data suggest that the overall perinatal prognosis for women with actively managed asthma during pregnancy is comparable to that for the nonasthmatic population.

Adult↗
PubMed1988

The course of asthma during pregnancy, post partum, and with successive pregnancies: a prospective analysis.

We studied 366 pregnancies in 330 prospectively managed women with asthma to determine the effect of pregnancy on asthma. Asthma activity was assessed by (1) daily symptom and medication diaries and (2) monthly auscultation and spirometry during pregnancy and for 3 months post partum. At 3 months post partum, subjects were asked to assess the overall course of their asthma during pregnancy compared to the usual course for them, and the course of their asthma during the 3 months post partum compared to the asthma during pregnancy. Asthma worsened during pregnancy in 35% of the women, improved in 28%, and was unchanged in 33%. Based on diary-card analysis, asthma was significantly less frequent and less severe during the last 4 weeks of pregnancy than during any other gestational interval. In women whose asthma improved during pregnancy, diary-card analysis revealed a gradual improvement with progressive pregnancy, whereas in women whose asthma worsened during pregnancy, there was an increase in asthma symptoms during 29 to 36 weeks gestation. During labor and delivery, asthma symptoms occurred in 10% of women with approximately equal proportions of these women receiving either no treatment or inhaled bronchodilators; only two subjects required intravenous aminophylline. During the 3 months post partum, asthma reverted toward its prepregnancy course in 73% of women. In 34 subjects prospectively studied for two successive pregnancies, there existed a significant concordance between the asthma course during the first and second pregnancies. The mechanistic and clinical implications of these findings are discussed.

Asthma↗
PubMedDate not supplied

Osteoporosis in corticosteroid-treated asthmatic patients: clinical correlates.

This study sought to identify clinical and laboratory characteristics associated with the development of osteoporosis in 44 corticosteroid (CS)-treated asthmatic patients. Percentage predicted bone density was inversely correlated with both the duration of CS therapy (r = -.39, p = 0.009) and 24-hour urine calcium excretion (chi 2 = 5.2, p = 0.022). Bone density was not related to prednisone equivalent dose, alternate day versus daily therapy or serum cortisol levels. These data suggest that (1) long duration of CS therapy and increased urine calcium may identify patients at increased risk of developing CS-induced osteoporosis, and (2) urinary loss of calcium may be of particular importance in the pathogenesis of this condition.

Adrenal Cortex Hormones↗