Publications
We work hard to attract, retain, and support the most outstanding faculty, and are proud of their accomplishments, in areas ranging from clinical care to research, from systems improvement to medical education, and in locations that include our clinical sites in San Francisco and others around the globe. Since 2008, over 1600 articles have been published.
2014
2014
CONTEXT
The burden of injuries to college ultimate players has never been fully described.
OBJECTIVE
To quantify the injury rate in ultimate players and describe the diagnoses, anatomic locations, and mechanisms of injuries.
DESIGN
Descriptive epidemiology study.
SETTING
College ultimate teams in the United States during the 2012 season.
MAIN OUTCOME MEASURE(S)
Initial injury rate per 1000 athlete-exposures.
RESULTS
The initial injury rate in college ultimate players was 12.64 per 1000 athlete-exposures; the rate did not differ between men and women (P = .5). Bivariate analysis indicated that injuries occurred twice as often during games as during practices, men were more likely than women to be injured when laying out for the disc, and men were more likely to incur strains and sprains than women.
CONCLUSIONS
Injury patterns to college ultimate players were similar to those for athletes in other National Collegiate Athletic Association sports. This is the first study to systematically describe injuries to ultimate players.
View on PubMed2014
PURPOSE
Previous studies analyzing the relationship between Body Mass Index (BMI) and complications after partial nephrectomy have been underpowered. We use a national surgical database to explore the association of BMI with postoperative outcomes for Open Partial Nephrectomy (OPN) and Minimally Invasive Partial Nephrectomy (MIPN).
PATIENTS AND METHODS
Years 2005-2012 of the National Surgical Quality Improvement Program (NSQIP) were queried for OPN and MIPN. Postoperative complications were organized according to Clavien Grades and compared across normal weight (BMI kg/m(2)=18.5-<25.0), overweight (BMI=25.0-<30.0), and obese (BMI≥30.0) patients using standard descriptive statistics and multivariate regression modeling.
RESULTS
Of 1667 OPNs and 2018 MIPNs, 46.2% of patients were obese. Operative time was 16.91 minutes longer on average for obese patients (p<0.001). The overall complication rate after OPN was 17.9%, 17.2%, and 17.9% (p=0.945) for normal weight, overweight, and obese patients, respectively; while the overall complication rate after MIPN was 6.9%, 6.3%, and 8.7% (p=0.147). Multivariate regression analysis demonstrated that overweight and obese patients were not at increased risk for any complication grade after OPN and MIPN compared to normal weight patients. When comparing procedures, MIPN had a lower complication rate compared to OPN for obese (8.7% vs 17.9%, p<0.001) and morbidly obese patients (9.2% vs 22.2%, p=0.001).
CONCLUSIONS
Although surgery in obese patients is longer compared to normal weight patients, it does not appear to increase the likelihood of 30-day postoperative complications for OPN or MIPN. However, obese patients undergoing MIPN had lower complication rates than those undergoing OPN.
View on PubMed2014
OBJECTIVE
Hypertension is an important risk factor for cardiovascular disease throughout the world. Little is known about the prevalence of hypertension in rural Haiti. Our study aims to estimate prevalence and knowledge of hypertension in Northern Haiti.
DESIGN
Cross-sectional.
SETTING
Four rural communities surrounding Milot, Haiti.
PARTICIPANTS
Participants (69 males, 106 females, 175 total) were eligible to take part if they were aged > 18 years and not pregnant. Enrollment was voluntary.
METHODS
Two initial blood pressure measurements were taken for each participant. Participants who had an average systolic blood pressure > or = 140 mm Hg or diastolic blood pressure > or = 90 mm Hg were instructed to return in 1 week for two additional confirmatory measurements. Based on these measures, participants were classified as either hypertensive or not. All participants were surveyed to assess their knowledge of hypertension.
RESULTS
The prevalence of hypertension among the study sample was 36.6%. Overall, 47% of women and 21% of men were hypertensive. Approximately 30% of women of reproductive age (18-39 years) were hypertensive. Participants showed little knowledge of the asymptomatic nature of hypertension and the need for lifelong treatment.
CONCLUSIONS
Hypertension is prevalent in Haiti. The high prevalence of hypertension among women of reproductive age is a concern since it is a risk factor for cardiovascular disease. Lack of knowledge surrounding hypertension indicates low awareness of the condition and is a possible target for future educational interventions.
View on PubMed2014
PURPOSE
The Patient Protection and Affordable Care Act increases oversight of surgical outcomes and ties hospital readmissions to Medicare reimbursement. Given the increasing volume of outpatient urological procedures, to our knowledge this study provides the first multi-institutional multivariate analysis of patient factors that contribute to readmission.
MATERIALS AND METHODS
Using the 2011 National Surgical Quality Improvement Program database we identified 7,795 patients. Multiple logistic regression was used to predict 30-day unplanned hospital readmissions controlling for demographics, clinical characteristics and comorbidities. Readmission rates of the 5 most common procedures were calculated along with the rate of postoperative complications associated with readmission.
RESULTS
Outpatient urological surgery had an overall 3.7% readmission rate. The 5 most common procedures were cystourethroscopy and resection of bladder tumor (readmission rate 4.97%), laser prostatectomy (4.27%), transurethral resection of prostate (4.24%), hydrocele excision (1.92%) and sling surgery for urinary incontinence (0.85%). The most common comorbidities in readmitted patients were hypertension, diabetes and smoking. Risk adjusted multiple regression indicated that cancer history (OR 3.48), bleeding disorder (OR 2.03), male gender (OR 1.38), ASA(®) level 3 or 4 (OR 1.34) and age (OR 1.01) were significant predictors of readmission. Readmitted patients also had a higher 30-day complication rate.
CONCLUSIONS
Readmission after outpatient urological surgery occurs at a rate of 3.7%. A history of cancer, bleeding disorder, male gender, ASA level 3 or 4 and age were associated with readmission along with greater rates of medical and surgical complications. Our results may help guide risk reduction initiatives and prevent costly readmissions.
View on PubMed2014
The World Health Organization recommends anthelminthic treatment for pregnant women after the first trimester in soil-transmitted helminth (STH) endemic regions to prevent adverse maternal-fetal consequences. Although studies have shown the high prevalence of infection in the Philippines, no research has evaluated deworming practices. We hypothesized that pregnant women are not receiving deworming treatment and we aimed to identify barriers to World Health Organization guideline implementation. We conducted key informant interviews with local Department of Health (DOH) administrators, focus group discussions with nurses, midwives, and health care workers, and knowledge, attitudes, and practices surveys with women of reproductive age to elicit perspectives about deworming during pregnancy. Key informant interviews revealed that healthcare workers were not deworming pregnant women due to inadequate drug supply, infrastructure and personnel as well as fear of teratogenicity. Focus group discussions showed that healthcare workers similarly had not implemented guidelines due to infrastructure challenges and concerns for fetal malformations. The majority of local women believed that STH treatment causes side effects (74.8%) as well as maternal harm (67.3%) and fetal harm (77.9%). Women who were willing to take anthelminthics while pregnant had significantly greater knowledge as demonstrated by higher Treatment Scores (mean rank 146.92 versus 103.1, z = -4.40, p<0.001) and higher Birth Defect Scores (mean rank 128.09 versus 108.65, z = -2.43, p = 0.015). This study concludes that World Health Organization guidelines are not being implemented in the Philippines. Infrastructure, specific protocols, and education for providers and patients regarding anthelminthic treatment are necessary for the successful prevention of STH morbidity and mortality among pregnant women.
View on PubMed2014
PURPOSE
We identified rates of and risk factors for complications after colpocleisis using the American College of Surgeons NSQIP® database.
MATERIALS AND METHODS
Women treated with Le Fort colpocleisis from 2005 to 2011 were identified in the database. Primary outcomes were 30-day complication rates. Secondary outcomes were risk factors for complications and the impact of age and a concomitant sling on morbidity. Clinical and procedural characteristics were compared using the chi-square test and 1-way ANOVA.
RESULTS
We identified 283 women, of whom 23 (8.1%) experienced complications. The most common complication was urinary tract infection in 18 women (6.4%). There was 1 death for a 0.4% mortality rate. Increased complications were associated with age less than 75 years (p = 0.03), chronic obstructive pulmonary disease (p = 0.03), hemiplegia (p = 0.03), disseminated cancer (p = 0.03) and open wound infection (p = 0.02). Six patients (2.1%) required return to the operating room within 30 days. Complication rates did not differ based on operative time (p = 0.78), inpatient status (p = 0.24), resident involvement (p = 0.35), concomitant sling placement (p = 0.81) or anesthesia type (p = 0.27). Women undergoing colpocleisis without (191) and with (92) a sling had similar baseline characteristics. Colpocleisis without and with a sling had similar rates of complications (7.9% vs 8.7%, p = 0.81), urinary tract infection (5.8% vs 7.6%, p = 0.55), return to the operating room (2.1% vs 2.2%, p = 0.97) and mortality (0% vs 1.1%, p = 0.15).
CONCLUSIONS
Mortality and complication rates after colpocleisis are low with urinary tract infection being the most common postoperative complication. Concomitant sling placement does not increase 30-day complication rates.
View on PubMed2014
BACKGROUND
Venous thromboembolism (VTE) is a significant cause of morbidity and mortality, particularly in the postoperative setting. Various risk stratification schema exist in the plastic surgery literature, but do not take into account variations in procedure length. The putative risk of VTE conferred by increased length of time under anaesthesia has never been rigorously explored.
AIM
The goal of this study is to assess this relationship and to benchmark VTE rates in plastic surgery.
METHODS
A large, multi-institutional quality-improvement database was queried for plastic and reconstructive surgery procedures performed under general anaesthesia between 2005-2011. In total, 19,276 cases were abstracted from the database. Z-scores were calculated based on procedure-specific mean surgical durations, to assess each case's length in comparison to the mean for that procedure. A total of 70 patients (0.36%) experienced a post-operative VTE. Patients with and without post-operative VTE were compared with respect to a variety of demographics, comorbidities, and intraoperative characteristics. Potential confounders for VTE were included in a regression model, along with the Z-scores.
RESULTS
VTE occurred in both cosmetic and reconstructive procedures. Longer surgery time, relative to procedural means, was associated with increased VTE rates. Further, regression analysis showed increase in Z-score to be an independent risk factor for post-operative VTE (Odds Ratio of 1.772 per unit, p-value < 0.001). Subgroup analyses corroborated these findings.
CONCLUSIONS
This study validates the long-held view that increased surgical duration confers risk of VTE, as well as benchmarks VTE rates in plastic surgery procedures. While this in itself does not suggest an intervention, surgical time under general anaesthesia would be a useful addition to existing risk models in plastic surgery.
View on PubMed2014
BACKGROUND
Hospital readmissions have become a topic of focus for quality care measures and cost-reduction efforts. However, no comparative multi-institutional data on plastic surgery outpatient readmission rates currently exist. The authors endeavored to investigate hospital readmission rates and predictors of readmission following outpatient plastic surgery.
METHODS
The 2011 National Surgical Quality Improvement Program database was reviewed for all outpatient procedures. Unplanned readmission rates were calculated for all 10 tracked surgical specialties (i.e., general, thoracic, vascular, cardiac, orthopedics, otolaryngology, plastics, gynecology, urology, and neurosurgery). Multivariate logistic regression models were used to determine predictors of readmission for plastic surgery.
RESULTS
A total of 7005 outpatient plastic surgery procedures were isolated. Outpatient plastic surgery had a low associated readmission rate (1.94 percent) compared with other specialties. Seventy-five patients were readmitted with a complication. Multivariate regression analysis revealed obesity (body mass index ≥ 30), wound infection within 30 days of the index surgery, and American Society of Anesthesiologists class 3 or 4 physical status as significant predictors for unplanned readmission.
CONCLUSIONS
Unplanned readmission after outpatient plastic surgery is infrequent and compares favorably to rates of readmission among other specialties. Obesity, wound infection within 30 days of the index operation, and American Society of Anesthesiologists class 3 or 4 physical status are independent predictors of readmission. As procedures continue to transition into outpatient settings and the drive to improve patient care persists, these findings will serve to optimize outpatient surgery use.
View on PubMed2014
BACKGROUND
Understanding risk factors that increase readmission rates may help enhance patient education and set system-wide expectations. We aimed to provide benchmark data on causes and predictors of readmission following inpatient plastic surgery.
METHODS
The 2011 National Surgical Quality Improvement Program dataset was reviewed for patients with both "Plastics" as their recorded surgical specialty and inpatient status. Readmission was tracked through the "Unplanned Readmission" variable. Patient characteristics and outcomes were compared using chi-squared analysis and Student's t-tests for categorical and continuous variables, respectively. Multivariate regression analysis was used for identifying predictors of readmission.
RESULTS
A total of 3,671 inpatient plastic surgery patients were included. The unplanned readmission rate was 7.11%. Multivariate regression analysis revealed a history of chronic obstructive pulmonary disease (COPD) (odds ratio [OR], 2.01; confidence interval [CI], 1.12-3.60; P=0.020), previous percutaneous coronary intervention (PCI) (OR, 2.69; CI, 1.21-5.97; P=0.015), hypertension requiring medication (OR, 1.65; CI, 1.22-2.24; P<0.001), bleeding disorders (OR, 1.70; CI, 1.01-2.87; P=0.046), American Society of Anesthesiologists (ASA) class 3 or 4 (OR, 1.57; CI, 1.15-2.15; P=0.004), and obesity (body mass index ≥30) (OR, 1.43; CI, 1.09-1.88, P=0.011) to be significant predictors of readmission.
CONCLUSIONS
Inpatient plastic surgery has an associated 7.11% unplanned readmission rate. History of COPD, previous PCI, hypertension, ASA class 3 or 4, bleeding disorders, and obesity all proved to be significant risk factors for readmission. These findings will help to benchmark inpatient readmission rates and manage patient and hospital system expectations.
View on PubMed2014
BACKGROUND
The safety of single-stage augmentation-mastopexy remains controversial given the dual purpose of increasing breast volume and decreasing the skin envelope. Currently, the literature is relatively sparse and heterogeneous. This systematic review considered complication profiles and pooled summary estimates in an attempt to guide surgical decision-making.
METHODS
Multiple databases were queried for combined augmentation-mastopexy outcomes. Whenever possible, meta-analysis of complication rates was performed.
RESULTS
Twenty-three studies met inclusion criteria. Average follow-up varied from 16 to 173 weeks, with a majority under 1 year. The pooled total complication rate was 13.1 percent (95 percent CI, 6.7 to 21.3 percent). The most common individual complication was recurrent ptosis, with an incidence of 5.2 percent (95 percent CI, 3.1 to 7.8 percent), followed by poor scarring (3.7 percent; 95 percent CI, 1.9 to 6.1 percent). The pooled incidences of capsular contracture and tissue-related asymmetry were 3.0 percent (95 percent CI, 1.4 to 5.0 percent) and 2.9 percent (95 percent CI, 1.2 to 5.4 percent), respectively. Infection, hematoma, and seroma were rare, with pooled incidences of less than 2 percent each. Three published studies reported data on patient satisfaction. The reoperation rate obtained from 13 studies was 10.7 percent (95 percent CI, 6.7 to 15.4 percent).
CONCLUSIONS
This meta-analysis encompassed 4856 cases of simultaneous augmentation-mastopexy. Study heterogeneity was high because of differences in surgical techniques, outcome definitions, and follow-up durations. This review suggests that with careful patient selection, pooled complication and reoperation rates for single-stage augmentation-mastopexy are acceptably low.
View on PubMed2014
2014
PURPOSE
In addition to excellent patient care, the focus of academic medicine has traditionally been resident training. The changing landscape of health care has placed increased focus on objective outcomes. As a result, the surgical training process has come under scrutiny for its influence on patient care. We elucidated the effect of resident involvement on patient outcomes.
MATERIALS AND METHODS
We retrospectively analyzed data from the 2005 to 2011 NSQIP® participant use database. Patients were separated into 2 cohorts by resident participation vs no participation. The cohorts were compared based on preoperative comorbidities, demographic characteristics and intraoperative factors. Confounders were adjusted for by propensity score modification and complications were analyzed using perioperative variables as predictors.
RESULTS
A total of 40,001 patients met study inclusion criteria. Raw data analysis revealed that cases with resident participation had a higher rate of overall complications. However, after propensity score modification there was no significant difference in overall, medical or surgical complications in cases with resident participation. Resident participation was associated with decreased odds of overall complications (0.85). Operative time was significantly longer in cases with resident participation (159 vs 98 minutes).
CONCLUSIONS
Urology resident involvement is not associated with increased overall and surgical complications. It may even be protective when adjusted for appropriate factors such as case mix, complexity and operative time.
View on PubMed2014
BACKGROUND
Knowledge of nasal carriage is important in predicting staphylococcal infection, and no information exists regarding the endemicity of Staphylococcus aureus in Haiti.
METHODS
We performed a cross-sectional analysis of S. aureus nasal screening in an acute care, a subacute rehabilitation, and a community setting, with a brief medical and epidemiological history. PCR-positive S. aureus screening nasal cultures underwent molecular analysis for spa type, SCCmec type, and virulence genes (Panton-Valentine leukocidin (PVL), toxic shock syndrome toxin (TSST), and arginine catabolic mobile element (ACME)), and were evaluated for antibiotic susceptibility using commercial tests.
RESULTS
Overall carriage rates of 8.4% methicillin-susceptible S. aureus (MSSA) and 2.8% methicillin-resistant S. aureus (MRSA) were identified, with a high rate of tetracycline resistance. TSST and PVL genes were identified in MSSA. MRSA isolates contained no virulence markers. Unique MSSA phenotypes (i.e., linezolid-resistant, vancomycin-sensitive/daptomycin non-susceptible) were identified, as were two PVL-positive ST152 MSSA colonization isolates, previously geographically limited to Africa.
CONCLUSIONS
We found a low S. aureus carriage rate with complete vancomycin susceptibility and high tetracycline resistance, which has important public health implications with regard to treatment. Additionally, the finding of PVL-positive MSSA isolates, including the expansion of a previously described limited 'divergent' clone, ST152, warrants further evaluation.
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