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Biomedical subjects

Warren L May

Publications and source records attributed to Warren L May.

15 recordsLinked to original sources

Factors associated with long-term complications after repair of mandibular fractures.

EDUCATIONAL OBJECTIVE: At the conclusion of this paper, the participants should be able to identify, compare, and discuss the natural history of complications of mandible fractures and repair. OBJECTIVES: To analyze factors affecting the incidence of long-term complications after the repair of mandible fractures. To determine whether the use of antibiotics at any time in the course of treatment impacted the development of complications. STUDY DESIGN: Retrospective medical record review. METHODS: Medical records for patients with mandibular fractures treated surgically over a 5 year period were reviewed for demographics, history of substance abuse, etiology, location of fracture, any associated facial injury, type and timing of repair, pre-, peri-, and postoperative antibiotic treatment, length of hospitalization, and lag time to repair. The development of infectious and other complications after surgery, specifically, the development of abscesses, fistulae, mal/nonunion, hardware exposure, or extrusion, were recorded. RESULTS: Of 273 subjects, 56 fractures were repaired using open reduction internal fixation (ORIF) alone, 112 mandibulomaxillary fixation (MMF), and 105 with a combination of MMF and ORIF. Eighteen (6.6%) patients developed an infectious or related long-term complication. These included abscess (n = 4), infected hardware (n = 1), mal/nonunion (n = 8), and hardware exposure/extrusion (n = 9). Smoking and alcohol abuse (P = .021) and the use of plating techniques (P = .04) correlated with a higher incidence of long-term complications. Patient age, sex, location and etiology of fracture, associated facial injury, lag time to repair, length of hospitalization, and the use of antibiotics at any time after injury or repair were unrelated to the development of complications. CONCLUSIONS: The development of infection, nonunion, and related complications after the repair of mandibular fractures correlates with a history of tobacco and alcohol use and ORIF of multiple fractures, but there were no statistically significant relationships to patient demographics, fracture site, lag time to repair, length of hospitalization, or the use of antibiotics. In this series, antibiotic therapy appears to have had no impact on the development of postoperative complications.

Adolescent↗

Weighted confidence interval construction for binomial parameters.

Confidence intervals, in general, have become an important aspect of reporting statistical results. In particular, interval estimators for binomial proportions have been studied extensively in recent literature. The large-sample Wald intervals are known to perform poorly, but the Wilson intervals have been shown to perform well in a variety of situations. One criticism is the relative difficulty of computing the Wilson or quadratic intervals in comparison to the Wald intervals. We offer a computational formula for the Wilson intervals that is a weighted estimator of the observed proportion, p, and that based on an uninformative prior, 1/2. This contribution enhances our understanding of the coverage behavior of the Wilson intervals. In addition, we contrast the Wilson intervals with other well-known intervals for the case of zero successes.

Confidence Intervals↗

Postpartum preeclampsia management with furosemide: a randomized clinical trial.

OBJECTIVE: This investigation was undertaken to estimate whether a brief postpartum course of furosemide for patients with preeclampsia benefits recovery and shortens hospitalization by enhancing diuresis, lessening severe hypertension, and reducing the need for antihypertensive therapy. METHODS: Two hundred sixty-four patients with preeclampsia were enrolled. After spontaneous onset of postpartum diuresis and discontinuation of intravenous magnesium sulfate, patients were randomly assigned to receive either no therapy or 20 mg oral furosemide daily for 5 days with oral potassium supplementation. Patient outcomes were compared between treatment groups with regard to classification of hypertensive disease. RESULTS: Only postpartum patients with severe preeclampsia (n = 70) who received furosemide compared with controls had significantly lower systolic blood pressure by postpartum day 2 (142 +/- 13 mm Hg compared with 153 +/- 19 mm Hg, P < .004) and required less antihypertensive therapy during hospitalization (14% compared with 26%, P = .371) and at discharge (6% compared with 26%, P = .045). No benefit was shown for patients with mild preeclampsia (n = 169) or superimposed preeclampsia (n = 25). Neither length of hospitalization nor frequency of delayed postpartum complications was positively affected by the intervention. CONCLUSION: Brief postpartum furosemide therapy for patients with severe preeclampsia seems to enhance recovery by normalizing blood pressure more rapidly and reducing the need for antihypertensive therapy. Shortening of hospitalization and reduction of delayed postpartum complications were not benefitted.

Adult↗

Postpartum intravenous dexamethasone for severely preeclamptic patients without hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome: a randomized trial.

OBJECTIVE: We compared maternal outcomes for patients with severe preeclampsia who were managed postpartum with or without adjunctive intravenous dexamethasone. METHODS: This study was a randomized, blinded placebo-controlled clinical trial comparing the use of dexamethasone postpartum (10 mg-10 mg-5 mg-5 mg intravenously every 12 hours) with a saline control in patients with severe preeclampsia. The Student t and chi(2) tests were used for data analysis, with P < .05 considered significant. RESULTS: Data from 157 patients (77 patients receiving dexamethasone, 80 patients receiving placebo) who were treated during 2000-2003 were analyzed. Demographics, diagnostic criteria, baseline laboratory values, and postpartum outcomes were similar between groups. Although dexamethasone-treated patients had fewer returns (6.5% compared with 11.3%) to the labor/delivery/recovery unit for uncontrolled hypertension than control patients, no significant differences were found in blood pressure, antihypertensive requirements, laboratory values, length of hospitalization, interval urine output at 48 hours postpartum, or major maternal morbidity. Two control patients developed hemolysis, elevated liver enzymes, low platelets syndrome. CONCLUSION: Adjunctive use of intravenous dexamethasone for postpartum patients with severe preeclampsia does not reduce disease severity or duration. LEVEL OF EVIDENCE: I.

Adult↗

The role of UGT1A1*28 mutation in jaundiced infants with hypertrophic pyloric stenosis.

Hypertrophic pyloric stenosis (HPS) may be accompanied by jaundice, a condition referred to as the icteropyloric syndrome (IPS). It has long been suspected that the etiology of IPS is an early manifestation of Gilbert's syndrome (GS). Clinical features common to both GS and IPS include jaundice precipitated by fasting and improved with feeding. Prevalence of jaundice in HPS is similar to that of clinically apparent GS in the general population. Discovery of a mutation in the promoter region of the bilirubin uridine diphosphate glucuronosyl transferase gene (UGT1A1*28) as the most common cause of GS has provided a tool to determine the role of GS in IPS. The aims of this study were to determine 1) the prevalence of IPS in a large group of infants with HPS, 2) whether disease severity contributed to the manifestation of IPS, and 3) whether GS played a role in IPS. Radioactive PCR and sequencing were used to determine the presence of UGT1A1*28 mutations. We determined a prevalence of IPS of 14.3% in HPS. Infants with IPS had significantly higher levels of alkalosis than infants with HPS alone. GS mutations were 4-fold higher in IPS (43.8%) than HPS (10.7%). In conclusion, the frequency of jaundice in HPS is similar to that of clinically apparent GS in the general population. Manifestation of IPS results from a more severe degree of metabolic disturbance and the presence of GS mutations.

Base Sequence↗

Demographics and distribution of dentists in Mississippi: a dental work force study.

BACKGROUND: Many segments of the population experience one or more barriers to accessing quality oral health care, including availability of licensed dentists. The purpose of the authors' study was to analyze the availability of dentists in Mississippi by county over four decades to determine the geographic distribution of dentists, shifts in their distribution over time and how this distribution relates to population demographics. METHODS: Dentist-to-population ratios were determined by county from 1970 through 2000. The authors analyzed these data using standardized z scores and geographic information systems (GIS) technology. Results are presented graphically and geographically. RESULTS: Results showed that 55 counties were designated as dental health professional shortage areas in 1970, 51 counties in 1980, 30 in 1990 and 40 in 2000. Counties that have a more favorable ratio of providers to population were determined, indicating areas in which dentists are more likely to practice. CONCLUSIONS: Many geographic areas in Mississippi remain underserved. Identifying these areas is a critical first step when addressing the current state of Mississippi's dental work force. This type of information is useful for decision making as well as responding to the population's oral health care needs. PRACTICE IMPLICATIONS: Results of this study can assist current and future practicing dentists, dental school administrators and policy-makers in making informed decisions for determining suitable practice locations, dental school admissions criteria and areas to target for public health initiatives. This model also is useful for studying work force disparities in other health care professions.

Dentistry↗

Obstetric implications of antepartum corticosteroid therapy for HELLP syndrome.

OBJECTIVE: We reviewed the impact of intravenous high-dose corticosteroid administration for preterm hemolysis, elevated liver enzymes, low platelets (HELLP) syndrome on vaginal delivery rate and degree of clinically significant thrombocytopenia. METHODS: Retrospective analysis of 1991-2000 HELLP syndrome (platelets < 100,000/uL, lactate dehydrogenase > 600 IU/L, aspartate aminotransferase and/or alanine aminotransferase > 70 IU/L) data focusing on labor inductions for gestations of less than 34 weeks and increase in platelet count sufficient to permit regional anesthetic techniques. RESULTS: Antepartum high-dose corticosteroid use increased from 32% (1991-1995) to 67% (1996-2000) for 350 patients studied (n = 199, < 34 weeks; n = 151, > 34 weeks). Corresponding vaginal delivery rates were 32% for gestations of less than 30 weeks, 61% at 30-31 weeks, and 62% at 32-33 weeks. Similarly, 27% of patients with a platelet count of less than 75,000/uL and 52% with a platelet count of less than 100,000/uL who received high-dose corticosteroids during the study interval subsequently achieved a 100,000/uL threshold in time to perform regional anesthesia for delivery. CONCLUSION: Administration of intravenous high-dose corticosteroids for preterm HELLP syndrome increases probability of successful labor induction and candidacy for regional anesthesia. LEVEL OF EVIDENCE: II-3.

Anesthesia, Conduction↗

Policy versus practice: comparison of prescribing therapy and durable medical equipment in medical and educational settings.

OBJECTIVE: The American Academy of Pediatrics (AAP) has promoted pediatrician involvement in the care of children with special health care needs (CSHCN), including the prescription and/or supervision of therapies and durable medical equipment (DME) for children in both medical and educational settings, such as schools and early intervention programs. Through this survey, we attempted to quantify objectively how pediatricians direct and coordinate therapy and DME for CSHCN and how these efforts correlate with AAP recommendations. METHODS: A survey was mailed to a random sample of 500 physicians listed in the AAP directory, resulting in a final sample of 217 responding physicians who indicated that they provide services to CSHCN. Results of the survey were reported as proportions, means with standard deviations, or medians with interquartile range. Comparisons of proportions among certain subgroups of interest were made using Fisher exact tests. RESULTS: The most recent AAP policy revision addressing the role of physicians in prescribing therapy services for children with motor disabilities appeared in Pediatrics 1996. It listed 6 key items that should be part of a therapy prescription: diagnosis, precautions, type, frequency, anticipated goals (educators may prefer the term "objectives"), and duration. The policy addressed and emphasized the need for what may be additional objectives, namely regular communication between all parties involved, ongoing supervision and reevaluation of the program and problem, and awareness of other community resources for possible referrals. Except for providing a diagnosis, the majority of surveyed pediatricians do not regularly comply with AAP policy recommendations on prescribing therapies and DME in medical and educational settings. Physicians who were trained before 1980 tend to follow AAP recommendations more closely than later graduates. Decreasing involvement of private outpatient pediatricians in coordinating and supervising CSHCN's care was noted. Furthermore, the majority is willing to defer decisions about treatment and goals to nonphysician health care providers (NPHCPs) and, in some cases, even equipment vendors. More than two thirds of the respondents indicated that they would sign a prescription for therapy without their previous initiation if it had been initiated by a therapist. Likewise, most respondents said that they would sign a wheelchair prescription sent to them by a therapist. Few expressed confidence in determining the appropriateness of leg brace (orthosis) prescriptions and arm/hand brace prescriptions. The majority of survey participants said that they give open-ended length of time (no limits under 1 year) on prescriptions for therapy services as part of school-based programs. However, patients' conditions and their therapeutic or equipment needs may change during the school year. Because open-ended prescriptions do not require periodic renewal, they do not provide opportunities for periodic feedback that helps to ensure that the pediatrician is kept abreast of the patient's status and progress. The majority of respondents indicated that they would see a patient before signing either a therapy or DME prescription if they had not seen that patient in the past year. A little more than half of survey respondents said that they would participate initially in recommending which professional services or therapies should be performed as part of early intervention programs most of the time, but one third said that they participated less than half the time and approximately 14% said that they never participated. A majority would require being involved before authorizing therapy services as part of a school-based program, but a substantial minority would provide retroactive authorization for services that they did not initiate themselves. More than three quarters of respondents would prefer to let the therapist or educator set the goals. Only 58% of pediatricians reported receiving a detailed progress report once or twice a year, and approximately one fifth received no reports on patients in school-based programs. A literature review suggested that there are different perceptions among physicians and educationally based service providers regarding the physician's role in initiating and supervising educationally based services and equipment, which may influence the extent of physician involvement. AAP and other professional organizations, such as the American Medical Association and the American Academy of Physical Medicine and Rehabilitation, as well as federal guidelines and third-party payers emphasize the important role of physicians in initiating, determining the medical necessity, and ordering of services as well as in ongoing patient treatment. If therapists through their states' scope of practice guidelines have autonomy of practice or if the school self-funds educationally based services, then there may be no issues regarding physician authorization. However, if a physician's authorization is required for reimbursement, then the physician's professional, legal, and practice guidelines come into play. Physicians should be conscientious about fulfilling their responsibilities in serving as the medical home and supervising and monitoring medical services for their patients in both community and educational settings. Failure to properly fulfill the responsibilities inherent in signing a prescription may bring adverse consequences for the patient as well subject the physician to legal liability if adverse events occur. CONCLUSIONS: Ideally, there should be a seamless continuity and cooperation among the environments of medicine, home, community, and education rather than separate and perhaps conflicting domains. All health care professionals and other service providers involved should be acknowledged as collaborative team members. Except for provision of the diagnosis, the majority of surveyed pediatricians do not comply with AAP policy recommendations on prescribing community/medical-based and educationally based services for CSHCN. Furthermore, the majority are willing to defer these decisions to other NPHCP. This raises issues regarding overall continuity of care versus care of the child in a variety of environments, the concept of the medical home, and legal risk as a result of failure to follow federal and state practice guidelines. Also, there seem to be different cultural perceptions among physicians and educationally based service providers regarding the physician's role in educationally based services. These cultural differences should be explored further to promote a greater collegial cooperation and understanding. Decreasing involvement of private outpatient pediatricians in coordinating and supervising CSHCN care and a trend toward greater deference to NPHCP since 1979 were noted. If the numerous policies and guidelines previously promoted by AAP have not had a significant impact on pediatrician practices in these fields, then other, more effective alternatives should be explored.

Child↗

Developmental expression of endothelial nitric oxide synthase (eNOS) in the rat liver.

Transition from fetal to postnatal life requires significant changes in cardiac, pulmonary, and hepatic blood flow. As such, there must be changes in vascular control in these vascular systems. Vascular resistance, a major contributor to blood flow, is mediated in the ductus arteriosus and pulmonary vasculature by endothelial nitric oxide synthase (eNOS). This study was conducted to determine the ontogeny of hepatic eNOS expression and activity. Additionally, the expression and activity of inducible nitric oxide synthase (iNOS) was measured to determine whether perinatal hypoxia resulted in detectable levels. NOS mRNA and proteins were determined by reverse transcription PCR assay and semiquantitative Western blot analysis, respectively. NOS activity was measured by the formation of [14C]-citrulline from [14C]-arginine. Localization of eNOS within the liver was determined by immunohistochemistry. eNOS mRNA was detectable at low levels at 18-d gestation and increased after birth, reaching a maximum level (4.5-fold increase) at 20 d of life. Parallel patterns for eNOS protein and activity were seen, with 6.9-fold and 16.1-fold increases, respectively. In the prenatal rat, eNOS was localized to areas of extramedullary hematopoiesis, with little signal in the sinusoids. Postnatally, there was a decrease in staining in the hematopoietic cells and a gradual increase in the staining of the endothelium of the sinusoids and central veins. iNOS mRNA and protein could not be detected at any age. eNOS expression and activity are developmentally regulated, increasing after birth coincident with an initial relative hypoxia and an increase in shear forces upon closure of the ductus venosus.

Animals↗

Maternal benefit of high-dose intravenous corticosteroid therapy for HELLP syndrome.

OBJECTIVE: We compared maternal outcomes for patients with HELLP (hemolysis, elevated liver enzymes, and low platelet count) syndrome treated with or without high-dose corticosteroids to ameliorate maternal disease. STUDY DESIGN: An analysis of data for patients with HELLP syndrome (platelets, or=600 IU/L; aspartate aminotransferase and/or alanine aminotransferase level, >or=70 IU/L) who were treated during the 7-year epochs before and after the clinical trials in 1992 and 1993 demonstrated maternal benefit with high-dose dexamethasone. RESULTS: Corticosteroid use increased from 16% (39/246 patients) for fetal indication from 1985 to 1991 to 90% (205/228 patients) for maternal-fetal indications from 1994 to 2000. Significantly reduced composite maternal disease from 1994 to 2000 was evidenced by improvements in laboratory parameters, disease progression to class 1 HELLP syndrome, the degree of hypertension, the need for antihypertensive therapy, the use of transfusion, and the presence of maternal morbidity (P<.05). Indices of postpartum recovery also were shortened significantly (P<.001). CONCLUSION: Routine early initiation of high-dose intravenous corticosteroids for patients with HELLP syndrome significantly lessened maternal disease, reduced maternal morbidity, and expedited recovery.

Adolescent↗

The importance of parity to major maternal morbidity in the eclamptic mother with HELLP syndrome.

OBJECTIVE: To determine if the rate of major morbidity from severe preeclampsia with/without hemolysis, elevated liver enzymes, and low platelets (HELLP) syndrome differs by parity. METHODS: Retrospective investigation of 970 gravidas with severe preeclampsia with and without HELLP syndrome analyzed according to parity. RESULTS: Altogether 609 (63%) patients were nulliparous and 361 (37%) parous. Between groups there was no significant difference in the incidence of overall major morbidity (21% vs. 19%, p=0.467), or specific morbidities including hematologic/coagulopathic (13.6% vs. 11.9%, p=0.442), cardiopulmonary (8.9% vs. 7.2%, p=0.362), CNS/visual (1.8% vs. 2.8%, p=0.319), or hepatorenal (0.8% vs. 2.2%, p=0.068). Although eclampsia was significantly more common in nulliparous (10.2%) than in parous patients (5.5%, p=0.012), the later significantly more often demonstrated major maternal morbidity associated with eclampsia (50%) than did nulliparous patients (25%, p=0.043). CONCLUSIONS: Unless parous patients with severe preeclampsia with or without HELLP syndrome develop eclampsia, their disease acuity does not differ significantly from their nulliparous counterparts.

Adolescent↗

Pediatric physiatry in 2000: a survey of practitioners and training programs.

OBJECTIVES: To assess the current status and future prospects of the field of pediatric rehabilitation medicine (PRM) physiatry by detailing the demographics, training, research interests, and other characteristics of physicians currently practicing in that field and to determine the availability of training programs in PRM. DESIGN: A printed survey of members of the American Academy of Physical Medicine and Rehabilitation Pediatric Rehabilitation Special Interest Group (PRSIG) and a separate questionnaire directed to departments of physical medicine and rehabilitation (PM&R) concerning their PRM training programs. SETTING: Not applicable. PARTICIPANTS: PRSIG members and PM&R training programs listed by the American Board of Physical Medicine and Rehabilitation. INTERVENTION: Between July 1998 and April 2000, a survey was sent to PRSIG members, with follow-up mailings to nonresponding members. Between April and July 2000, a survey on PRM training practices was sent to 82 PM&R departments with fax and telephone follow-up to nonresponders and to those departments that had discontinued their training program. MAIN OUTCOME MEASURES: Instrument measures of physicians practicing PRM, including demographics, geographic distribution, practice sites, training, academic participation, special interests, and research interests along with willingness to participate in collaborative research, association in other organizations, and communication preferences. Data on training requirements as well as availability of PRM fellowships and combined pediatric and PM&R residencies indicate that the number and scope of these training opportunities are declining. RESULTS: There is little uniformity in the amount of exposure to pediatric rehabilitation required by PM&R residency training programs. There are discrepancies in the reported numbers of PRM fellowships and/or combined pediatric and PRM training programs. Projecting the number of physicians who will be practicing in this subspecialty in the future is difficult because there are no reliable data about the number of graduates or trainees in the field. CONCLUSIONS: The rehabilitation needs of children are met by physiatrists with specialized pediatric training. Our survey provided a demographic overview of the PRSIG membership. Given the decline in PRM training programs, it is imperative that the remaining programs be strengthened through communication and organization among physiatrists who practice PRM. We believe that a national database and an interactive Web site are feasible means with which to facilitate this goal.

Child↗

Unsedated upper endoscopy in children.

BACKGROUND: EGD is essential to the investigation and treatment of GI disorders in children. Although safe, EGD has the potential for complications, in particular cardiopulmonary abnormalities associated with intravenous sedation. EGD is often performed in adults without sedation. Unsedated EGD is occasionally performed in children but has not been subjected to study. This study assessed the safety, efficacy, and feasibility of unsedated EGD in children. METHODS: Selected, highly motivated children requiring EGD were offered the choice of sedation or no sedation for the procedure. Children recorded scores for pain (face scale) and anxiety (vertical visual analogue scale) before and after EGD. In addition, the times required to prepare the patient, perform the EGD, and recover the patient were recorded. RESULTS: There was no difference in age, gender, or pre-EGD pain scores between children selecting sedation or no sedation. However, children selecting sedation had significantly higher pre-EGD anxiety scores than those who chose no sedation. Successful completion of EGD was similar for sedated (96.3%) and unsedated (95.2%) children. Post-EGD scores for anxiety were significantly decreased in those receiving sedation and unchanged in children who received no sedation. There was no significant change in post-EGD pain score in either group. Nearly 80% of children undergoing unsedated EGD would elect to forego sedation if EGD was needed again. Total procedure time was significantly longer in sedated versus unsedated children, reflecting longer preparation and recovery. CONCLUSIONS: Unsedated EGD can be performed safely and successfully in children with good patient tolerance. There was a significant decrease in total procedure time for children who have unsedated EGD. Unsedated EGD should be considered a viable option for motivated children.

Adolescent↗

Cervical ripening and induction of labor with misoprostol, dinoprostone gel, and a Foley catheter: a randomized trial of 3 techniques.

OBJECTIVE: The purpose of this study was to compare the efficacy of 3 different techniques of cervical ripening and induction. STUDY DESIGN: Patients who required cervical ripening and induction were randomized to one of 3 groups: (1) supracervical Foley catheter and intravaginal dinoprostone gel, (2) supracervical Foley catheter and 100 microg oral doses of misoprostol, or (3) serial 100-microg oral doses of misoprostol. Intravenous oxytocin was administered when a protraction disorder of labor was identified. RESULTS: There were 339 women randomized. There was no significant difference in the time from first intervention to delivery in the 3 groups (P =.546). In each group, a similar percentage of women required oxytocin (P =.103). The rates of cesarean delivery were equivalent among the groups (P =.722). Rates of tachysystole were high but statistically equivalent among the 3 groups. There were no significant differences in Apgar scores or umbilical artery pH. CONCLUSION: Oral 100 microg serial doses of misoprostol, with or without the use of a supracervical Foley catheter, were equivalent to the use of a supracervical Foley catheter and serial 4-mg doses of dinoprostone gel for cervical ripening and the induction of labor.

Adult↗

Building evidence for practice: a pilot study of newborn bulb suctioning at birth.

The purpose of the study was to examine the effects of bulb suctioning on healthy, term newborns and the feasibility of conducting a large-scale study of this practice. In a randomized, controlled two-group design pilot study, 10 newborns received oronasopharyngeal bulb suctioning at birth and 10 did not. Differences in Apgar scores, heart rates, and oxygen saturation levels were determined. Infants were randomized to groups before delivery. The participants were 20 term, healthy newborns of uncomplicated pregnancies. Apgar scores, heart rates, and oxygen saturation levels in the first 20 minutes of life were the main outcome variables. There were no statistically significant differences in Apgar scores between groups. Apgar scores at 5 and 10 minutes were 9 or 10 for all newborns. Newborns receiving bulb suctioning showed a statistically significant, lower heart rate (P=.042) during the first 20 minutes and a significantly higher SpO2 level (P=.005) by 15 minutes of age. Although statistically significant, these findings were not considered clinically significant because values remained within normal parameters.

Adolescent↗