Kristin A. Swedish

Risk factors for the development of fulminant Clostridium difficile colitis.

BACKGROUND The development of fulminant Clostridium difficile colitis (FCDC) requires prompt operative intervention and is associated with a high mortality rate. The aim of this study was to use a case-control design to define the clinical and laboratory parameters that predict which patients with Clostridium difficile infection are most likely to progress to FCDC. METHODS Cases from 1994 to 2006 with documented in-hospital progression of Clostridium difficile infection to FCDC were matched retrospectively at the start of medical therapy by age, sex, and intensive care unit (ICU) status to controls with Clostridium difficile infection who did not develop FCDC. Chi-Square and multivariable logistic regression were used to identify risk factors for progression to FCDC. RESULTS A total of 35 patients with FCDC were matched to 70 controls with Clostridium difficile infection who did not develop FCDC. The patients with FCDC underwent colectomy after an average of 4.6 days of medical therapy and had a mortality rate of 40%. On multivariate analysis, independent risk factors for the development of FCDC were a WBC > 16,000 cells/mm(3) (P < .01) at initiation of therapy, operative therapy within the last 30 days (P = .03), a history of inflammatory bowel disease (P = .04), and a history of intravenous immunoglobulin treatment (P < .01). CONCLUSIONS Leukocytosis, recent prior operative therapy, and a history of inflammatory bowel disease and intravenous immunoglobulin treatment were negative prognostic indicators for patients with Clostridium difficile infection. The presence of these factors merits close observation for progression to FCDC and acceleration of the planning process for operative intervention.

Prevention of Recurrent High-Grade Anal Neoplasia With Quadrivalent Human Papillomavirus Vaccination of Men Who Have Sex With Men: A Nonconcurrent Cohort Study

BACKGROUND Most squamous cell anal cancers and precancerous lesions are attributed to human papillomavirus (HPV) infection. By preventing HPV infection, quadrivalent HPV vaccine (qHPV) reduces risk of anal cancer/precancerous lesions in young men who have sex with men (MSM) without history of anal cancer/precancerous lesions. In our practice, many persons with history of precancerous anal lesions or high-grade anal intraepithelial neoplasia (HGAIN) have been vaccinated electively. We determined whether qHPV is effective at preventing recurrence of HGAIN. METHODS This nonconcurrent cohort study evaluated 202 patients with a history of previously treated HGAIN. Eighty-eight patients were vaccinated, and 114 patients were unvaccinated. We determined the recurrence rate of histologic HGAIN in vaccinated versus unvaccinated patients. RESULTS During 340.4 person-years follow-up, 12 (13.6%) vaccinated patients and 35 (30.7%) unvaccinated patients developed recurrent HGAIN. Multivariable hazards ratio (HR) analysis showed testing positive for oncogenic HPV genotypes within 8 months before study entry was associated with increased risk of recurrent HGAIN at 2 years after study entry (HR 4.06; 95% confidence interval [CI], 1.58-10.40; P = .004), and qHPV was associated with decreased risk of recurrent HGAIN (HR .50; 95% CI, .26-.98; P = .04). Among patients infected with oncogenic HPV, qHPV was associated with decreased risk of recurrent HGAIN at 2 years after study entry (HR .47; 95% CI, .22-1.00; P = .05). CONCLUSIONS qHPV significantly reduces HGAIN recurrence among MSM and may be an effective posttreatment adjuvant form of therapy. A randomized controlled trial is needed to confirm these results.

The Changing Picture of High-grade Anal Intraepithelial Neoplasia in Men Who Have Sex With Men: The Effects of 10 Years of Experience Performing High-resolution Anoscopy

BACKGROUND: Ten years ago, we published findings from anal dysplasia screening in a metropolitan surgical practice where the majority of men who have sex with men had biopsy-proven high-grade anal intraepithelial neoplasia. OBJECTIVE: This study aimed to determine the effect of 10 years of experience in anal dysplasia screening on the prevalence of high-grade anal intraepithelial neoplasia. DESIGN: A retrospective chart review was performed of all anal cytology results of 1189 men who have sex with men screened in a 1-year period, with subsequent high-resolution anoscopy and biopsy as necessary. PATIENTS: The patients studied were men who have sex with men. MAIN OUTCOME MEASURE: The main outcome measure was biopsy-proven high-grade anal intraepithelial neoplasia. RESULTS: There were 315 (37.2%) biopsy-verified instances of high-grade anal intraepithelial neoplasia. Regression analysis determined that age, HIV status, infection by high-risk human papillomavirus, and abnormal cytology results were significant predictors of high-grade anal intraepithelial neoplasia. In a 1-year period, the number of men who have sex with men screened was nearly 7 times greater than in the 2-year period studied 10 years earlier. LIMITATIONS: We did not separately analyze patients who had previously been treated for high-grade anal intraepithelial neoplasia. CONCLUSIONS: Severity of cytology and infection with high-risk human papillomavirus are the most significant predictors of high-grade anal intraepithelial neoplasia, underscoring the importance of anal dysplasia screening. Our ability to identify high-grade anal intraepithelial neoplasia has improved with 10 years of experience performing high-resolution anoscopy.

First season of 2009 H1N1 influenza.

The 2009 H1N1 influenza virus is responsible for the first influenza pandemic of the 21st century. Within 5 months after its emergence in Mexico, it had affected more than 290,000 patients and caused at least 3486 deaths on 6 continents. This report provides information about influenza viruses, previous pandemics, and the virology, clinical features, and epidemiology of 2009 H1N1 influenza in order to elucidate the current pandemic and outline the questions that remain.

Anal condyloma treatment and recurrence in HIV-negative men who have sex with men.

BACKGROUND: Men who have sex with men have increased prevalence of both human papillomavirus and anogenital condyloma. OBJECTIVE: Risk factors for multiple treatment and recurrence of anal condyloma were examined. DESIGN: This is a retrospective study of HIV-negative men who have sex with men who were treated for anal condyloma. SETTINGS: This study was conducted in a private surgical practice. PATIENTS: The patients were HIV-negative men who have sex with men, aged 18 years or older. INTERVENTION(S): Ablation with electrocautery or CO2 laser was performed, as well as excision and topical imiquimod condyloma treatment adjuvant. MAIN OUTCOME MEASURES: Primary clearance, defined as 4 months of condyloma-free survival posttreatment, and recurrence, defined as any anal condyloma diagnosis after primary clearance. RESULTS: Of 231 participants, 207 achieved primary clearance (median age, 32.0 years) and were followed (median, 18.2 months) after primary treatment. Most had intra-anal and perianal condyloma (56%), were treated with electrocautery ablation (79.2%), and required 1 treatment (range, 1–6) for clearance. There were 57 recurrences (median, 12 months). One-third each had minimal, moderate, or extensive disease. Forty-six percent of patients received imiquimod posttreatment adjuvant. High-grade dysplasia was found in 31% at presentation and 43% during follow-up. Factors associated with requiring multiple treatments for clearance were participants having moderate disease (adjusted odds ratio, 6.0 (1.7–21.4)) and receiving imiquimod adjuvant (adjusted odds ratio, 4.7 (2.0–10.6)). No single factor predicted recurrence, but those with moderate disease experienced recurrences significantly sooner (median, 25 months of follow-up). LIMITATIONS: This was a retrospective chart review, it was limited to a single practice, and it excluded those who did not achieve primary clearance. CONCLUSIONS: Most men who have sex with men have intra-anal and perianal condyloma and concomitant high-grade dysplasia is common. Most achieved clearance with 1 treatment. Having both intra-anal and perianal condyloma, increased severity of disease, and imiquimod adjuvant were significant predictors of requiring multiple treatments for clearance. No identified risk factors proved a significant predictor of recurrence.