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Biomedical subjects

J C Dickinson

Publications and source records attributed to J C Dickinson.

At least 19 recordsLinked to original sources
PubMed2000

A screening approach to the surveillance of patients with diabetes for the presence of vision-threatening retinopathy.

OBJECTIVE: To provide scientifically based screening rules for the primary care setting designed to identify, through evaluation of a prescribed and limited portion of the posterior fundus, those patients with diabetes who have retinopathy severe enough to need referral to eye care specialists. DESIGN: Retrospective analysis of the Early Treatment Diabetic Retinopathy Study (ETDRS) photographic data base. PARTICIPANTS: The fundus photographic grading data from 3711 patients with diabetes enrolled in the ETDRS. METHODS: Multivariate regression techniques were used to identify retinopathy lesions in photographic fields 1, 2, 3, or a combination thereof that predict proliferative diabetic retinopathy (PDR) or clinically significant macular edema (CSME) within the seven standard fields. These were used to construct a family of screening rules with optimal combined sensitivity and specificity on which to base referrals to eye care specialists. MAIN OUTCOME MEASURES: Presence of moderate to severe nonproliferative diabetic retinopathy (NPDR), PDR, or CSME in graded fundus photographs. RESULTS: Hemorrhages and microaneurysms (h/ma) temporal to the macula (photographic field 3), as severe as or more severe than ETDRS standard photograph 1 (h/ma 3 > or = 3), identified 87% to 89% of eyes with PDR and 92% to 93% of eyes with moderately severe to severe NPDR, which are at high risk for developing PDR. Extrapolating the results using retinopathy prevalence data from epidemiologic studies for the general older onset diabetic population, the calculated sensitivity for detecting PDR on a single examination is 87%, the specificity 80%; for moderate NPDR or worse, the sensitivity is 81 %, specificity 93%. Applying the presence of h/ma 3 > or = 3 as a screening rule to the older onset population, 26.5% of patients would be referred and 73.5% would not be referred. Any hard exudate within one disc diameter of the macular center detects CSME with sensitivity 94%, specificity 54%. Hard exudate of moderate or worse severity anywhere in the macular region (field 2) predicts CSME with sensitivity 89%, specificity 58%. CONCLUSIONS: Screening protocols based on assessing retinopathy lesion severity in the posterior fundus have the potential to identify most diabetic patients with vision-threatening retinopathy. If the protocols can be implemented effectively in a primary care setting, patients requiring referral for specialty care could be reliably identified, and the total number of patients needing specialty referral could be substantially reduced from current guidelines.

Diabetes Mellitus↗
PubMed1993

The paradox of electronic fetal monitoring: more data may not enable us to predict or prevent infant neurologic morbidity.

Electronic fetal heart rate monitoring has been used to identify periods of fetal risk, with the hope that clinical intervention would avoid the potential for perinatal death or neurologic damage. A literature review of 10 infant studies failed to document fetal heart rate patterns associated with neurologic injury or protocols for intervention to avoid neurologic injury. A separate analysis of fetal heart rate patterns from 55 brain-damaged infants failed to find consistent patterns that foreshadowed the observed brain injury. These findings should not be surprising, because the majority of infant brain damage occurs outside the intrapartum period and because electronic monitoring may identify times of fetal risk but was never expected to identify brain damage.

Brain Diseases↗
PubMed1992

The incidence of cerebral palsy.

The clinician is often held responsible for obstetric events that are suspected of being related to cerebral palsy. To review the incidence of cerebral palsy and to aid the clinician in this situation, a search of published studies was conducted. Composite rates of cerebral palsy in different birth weight infants and cerebral palsy with and without serious mental retardation were calculated. The cumulative incidence rate at the age of 5 to 7 years was 2.7 cases of cerebral palsy for 1000 birth cohorts. Approximately 36% of all cerebral palsy occurred in the infant less than 2500 gm. Serious mental retardation (intelligence quotient less than 50) accompanied cerebral palsy approximately 30% of the time for the term infant and 18% of the time when the infant was less than 2500 gm. On the basis of a past estimation that 70% of cerebral palsy is of antepartum or unknown origin, the term infant at risk for intrapartum-attributed cerebral palsy may be about 1 in 2000 term births.

Birth Weight↗
PubMed1992

Abnormal labor and infant brain damage.

OBJECTIVE: To determine whether arrest disorders result in increased neurologic abnormalities in infancy or childhood. METHODS: Four hundred thirteen infants with arrest disorders as defined by Friedman criteria were matched to a similar population without arrest disorders. The median length of follow-up was 6 years for the study infants and 5.07 years for the controls. The numbers of children with abnormalities in the groups with and without arrest disorders, as well as the specific abnormalities encountered, were stratified by method of delivery. RESULTS: Thirty neurologic abnormalities were found in the arrest group and 37 in the control group; thus, the null hypotheses could not be rejected. In addition, although the control group was not followed as long as the study population, the diagnosis of abnormalities was more frequent in the later years in the controls. This suggests that had the follow-ups been equal, there would have been stronger proof that arrest by itself was not associated with infant brain damage. CONCLUSION: Our study confirms that labor diagnoses of prolonged active phase, protractions or arrests, and failure to descend are not associated with increased neurologic abnormalities. Delivery by cesarean or vaginal birth and use of oxytocin are not factors in the etiology of major brain damage.

Brain Damage, Chronic↗
PubMed1991

Vaginal birth after cesarean: a meta-analysis of morbidity and mortality.

The cesarean birth rate has continued to climb despite efforts to counteract it. A major reason for this rise is the practice of elective repeat cesarean. We conducted a meta-analysis that included 31 studies with a total of 11,417 trials of labor to evaluate the association between birth route after a cesarean and morbidity and mortality for the mother and infant. Summary odds ratios were calculated. Maternal febrile morbidity was significantly lower after a trial of labor than after an elective repeat cesarean. The intended birth route made no difference in the rates of uterine dehiscence or rupture. The use of oxytocin, presence of a recurrent indication for the previous cesarean, and presence of an unknown uterine scar were also unassociated with dehiscence or rupture. After excluding antepartum deaths, fetuses weighing less than 750 g, and congenital anomalies incompatible with life, we found no difference in perinatal death rates. The proportion of 5-minute Apgar scores of 6 or lower was higher after a trial of labor, but we were unable to exclude very low birth weight fetuses or those with congenital anomalies from this analysis. Our findings argue for trials of labor for more women after a cesarean birth.

Cesarean Section↗
PubMed1990

Vaginal birth after cesarean: a meta-analysis of indicators for success.

The cesarean birth rate has continued to climb despite efforts to counteract this trend. A major reason for this rise is the practice of doing an elective repeat cesarean. Our study used a statistical model of meta-analysis to analyze the findings of 29 individual studies that looked at the association between the success of a trial of labor and various preexisting conditions. We hypothesized that various preexisting factors, including cephalopelvic disproportion, previous breech, previous vaginal delivery, more than one previous cesarean, use of oxytocin, and the length of labor and extent of dilatation in the previous cesarean, would affect the prediction of the outcome of a trial of labor. After determining odds ratios for the individual preexisting factors from the individual studies, we calculated overall odds ratios which incorporated the findings from all of the studies. For previous cephalopelvic disproportion, the odds were 0.5 for a successful trial of labor; for prior breech, 2.1; for women with a previous vaginal delivery, 2.1; for women who had had more than one cesarean, 0.7; and for women receiving oxytocin, 0.3. We were unable to analyze other preexisting factors because the data were not available, but short discussions of some of these other factors are offered. Even though the success rates do vary with the different preexisting factors, the clinician may anticipate a greater than 50% chance for success in any individual labor.

Breech Presentation↗
PubMed1989

Island pedicled nerve grafts.

A technique of nerve grafting is described whereby a nerve "graft" is raised, maintaining its blood supply via a vascular pedicle. It is then transposed to reconstruct a defect in an adjacent nerve. Although there is little clinical evidence that this technique results in better nerve regeneration when compared with conventional nerve grafting, the method has advantages which are discussed.

Adult↗
PubMed1989

Forearm muscle herniae and their treatment.

Three cases of forearm muscle hernia are described. Their aetiology differed but, in all three, symptoms were sufficiently severe to interfere with the patient's work. Surgical repair of the myocoeles, by closure of the fascial defects using lata onlay grafts or an interweave of palmaris longus tendon, produced complete resolution of symptoms and enabled the patients to return to full employment.

Adult↗
PubMed1988

Significance of normal endometrial cells detected by cervical cytology.

A retrospective study was conducted to assess and confirm the significance of normal-appearing endometrial cells detected in cervical cytologic smears in the second half of the menstrual cycle or in the postmenopausal period. Of 440 women with normal endometrial cells identified on routine Papanicolaou smears, 179 underwent further endometrial evaluation. Endometrial disease was identified in 64 (35.7%) of those patients having endometrial sampling and/or hysterectomy within 12 months of the cytologic evaluations. These lesions included 21 cases (11.7%) of endometrial polyps, 23 cases (12.9%) of endometrial hyperplasia, and 20 cases (11.2%) of adenocarcinoma. The frequency of endometrial cancer was positively associated with age (P less than .01). Five of 20 women with endometrial cancer were asymptomatic.

Adenocarcinoma↗
PubMed1987

Hypospadias repair: the seagull meatoplasty.

An operation is described which has been used in six cases to produce a single stream of urine in patients who were spraying following hypospadias repair. It has also been used in four patients to advance the meatus terminally.

Adolescent↗