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Allan Chang

Publications and source records attributed to Allan Chang.

4 recordsLinked to original sources
PubMed2005

Screening test model using duration of labor for the detection of postpartum urinary retention.

AIMS: To construct a screening test model for postpartum urinary retention (PUR), using the duration of labor, which was shown to be the risk factor for PUR. METHODS: A group of 691 consecutive patients were recruited at postpartum day 1. Of the 691 patients, 101 (14.6%) had PUR. The 691 patients were computer-randomized into two groups, 'A' and 'B.' A receiver operating characteristic (ROC) curve was constructed for Group A to determine the optimum cutoff value for screening PUR using the duration of labor. The cutoff value was then applied to Group B to determine the screening test characteristics of the duration of labor: sensitivity, specificity, predictive values, and likelihood ratios. RESULTS: An ROC curve with an area under curve (AUC) of 0.63 (95% CI 0.57-0.69, P < 0.0001) was constructed. A range of cutoff values (with specificity ranging from 0.60 to 0.99) for the duration of labor was determined and the test characteristics computed. According to the test characteristics the optimal cutoff value for the duration of labor was 700 min. This cutoff value for the duration of labor has a specificity of 0.95, negative predicative value of 0.86, and likelihood ratio for a positive test of 0.88. CONCLUSION: A screening test model using the duration of labor can be constructed to predict PUR.

Adult↗
PubMed2003

Effect of one interval vaginal delivery on the prevalence of stress urinary incontinence: a prospective cohort study.

AIMS: To analyze the effect of one interval vaginal delivery on the prevalence of stress urinary incontinence amongst a cohort of nulliparous women. METHODS: A cohort of 276 nulliparous women without incontinence was recruited consecutively in 1996, after they had vaginal delivery, and were followed-up for urinary incontinence in 2000. The age, obstetric variables of the 1996 delivery (mode of delivery, genital tract trauma, birth weight, epidural analgesia, episiotomy, durations of labor, postpartum urinary retention), and the presence of interval vaginal delivery during the follow-up period were recorded. The obstetric factors and the prevalence of urinary stress incontinence at follow-up were then compared between women with and without interval vaginal delivery. Logistic regression analysis was performed to test the independence of the obstetric variables in the index pregnancy and the presence of one interval vaginal delivery, with urinary stress incontinence being the dependent variable. RESULTS: A total of 148 (53.6%) women were followed-up. The prevalence of urinary incontinence was 28.6% in women without interval delivery and 21.1% in women with one interval delivery. There was no significant difference in the prevalence of urinary incontinence between the two groups (chi(2) test, P = 0.31). Logistic regression showed that none of the obstetric variables or the presence of one interval vaginal delivery was significantly associated with urinary incontinence. CONCLUSIONS: One interval vaginal delivery does not increase risk of urinary stress incontinence 4 years after the index vaginal delivery.

Adult↗
PubMedDate not supplied

Chronic venous leg ulcers: effect of a community nursing intervention on pain and healing.

AIM: To investigate the effectiveness of a new community nursing model of care for clients with chronic leg ulcers in terms of levels of pain and ulcer healing. METHOD: A randomised controlled trial comparing the new model of care with standard community nursing care was conducted with a sample of 56 clients with chronic venous leg ulcers, 28 clients in the intervention group and 28 in the control group. Data were collected on admission to the study and at 12 weeks from admission. RESULTS: Significant improvements in levels of pain and ulcer healing were found in the intervention group receiving the new model of care. CONCLUSION: Results from this study have implications for health professionals providing care for clients with chronic leg ulcers.

Aged↗