Smoking exposure in pack-years predicts cutaneous manifestations and damage in systemic lupus erythematosus.

OBJECTIVE: To examine the impact of cumulative smoking in pack-years on systemic lupus erythematosus (SLE) cutaneous manifestations and damage. METHODS: Our cohort study included 632 adult SLE patients at an academic center, meeting 1997 ACR or 2012 SLICC classification criteria. Outcomes were: (1) cutaneous SLICC Damage Index (SDI), (2) ACR and SLICC criteria. Smoking exposure was defined as low (<5 pack-years), medium (5-10), and high (>10), compared to non-smokers. Analysis used multivariable logistic regression to calculate odds ratios and confidence intervals (OR, (95% CI)). RESULTS: Among 632 SLE patients, mean age 42 ± 14, 91% were female, 82% White, and 40% were ever smokers. Black patients were more likely to have smoked (51% vs. 41% White, 11% Other). Chronic SLICC and SDI cutaneous criteria showed linear pack-year trends, meeting significance with high smoking exposure (OR 2.2, (1.2, 4.2); OR 4.2, (1.9, 9.2)). Those with medium exposure were more likely to meet acute SLICC cutaneous criteria (OR 2.3, (1.1, 5.1)). Low exposure predicted any cutaneous SLICC and ACR criteria (OR 3.7, (1.3, 10.6); OR 2.0 (1.03, 3.8)). Patients of color had more chronic SLICC cutaneous criteria (Other Race OR 3.6 (1.6, 8.1)) and SDI skin damage (Black OR 2.6 (1.1, 5.9)) even controlling for smoking exposure. CONCLUSIONS: Smoking was an independent risk factor for cutaneous SLE. High pack-year exposure and non-White race increased chronic skin manifestations and SDI damage. Findings suggested a dose relationship between smoking and cutaneous SLE damage, making cessation messaging important to potentially improve outcomes and reduce some disparities.

The effect of smoking on cumulative damage in systemic lupus erythematosus: An incident cohort study.

OBJECTIVES: To investigate the relationship between smoking history and pack-year exposure on the rate of end-organ damage in systemic lupus erythematosus (SLE). METHODS: The SLE incident cohort included patients who met American College of Rheumatology (ACR) 1997 or SLE International Collaborating Clinics (SLICC) 2012 SLE criteria and had rheumatology encounters at a US academic institution (2008-16). The primary outcome was median time to SLICC/ACR damage index (SLICC/ACR-DI) increase or death. Main explanatory variables were smoking status and pack-years. Covariates included age, sex, race, ethnicity, receipt of Medicaid, neighborhood area deprivation index, and baseline SLE damage. Damage increase-free survival was evaluated by smoking status and pack-years using Kaplan-Meier and Cox proportional hazards methods. RESULTS: Patients of Black race and Medicaid recipients were more commonly current smokers (p's < 0.05). Former smokers were older and more likely to have late-onset SLE (54% versus 33% of never and 29% of current smokers, p = 0.001). Median time to SLICC/ACR-DI increase or death was earlier in current or former compared to never smokers (4.5 and 3.4 versus 9.0 yrs; p = 0.002). In multivariable models, the rate of damage accumulation was twice as fast in current smokers (HR 2.18; 1.33, 3.57) and smokers with a >10 pack-year history (HR 2.35; 1.15, 3.64) versus never smokers. CONCLUSIONS: In this incident SLE cohort, past or current smoking predicted new SLE damage 4-5 years earlier. After adjustment, current smokers and patients with a pack-year history of >10 years accumulated damage at twice the rate of never smokers.

Outcomes of Clostridium difficile infection in recipients of solid abdominal organ transplants.

Knowledge of outcomes of Clostridium difficile infection (CDI) in solid organ transplant (SOT) recipients is limited. To evaluate this population, we undertook a retrospective cohort study of all recipients of kidney and liver transplants diagnosed with CDI at a single center over 14 yr. Data pertaining to all episodes of CDI were collected. Multivariate analysis using logistic regression was performed to determine independent predictors of clinical cure. Overall, 170 patients developed 215 episodes of CDI. Among these patients, 162 episodes (75%) were cured, and in 103 episodes (48%), patients were cured within 14 d. In a multivariate analysis, lack of clinical cure at 14 d was predicted by recurrent episode (0.21, 95% CI 0.06-0.72, p = 0.0128), treatment with vancomycin (OR 0.27, 95% CI 0.1-0.74, p = 0.011), vasopressor support (OR 0.23, 95% CI 0.07-0.76, p = 0.0161), and CDI before the year 2004 (OR 0.44, 95% CI 0.2-0.98, p = 0.0446). The latter three factors are likely markers for severity of illness. In this cohort, 13 patients (8%) died during hospitalization, and 49 patients (29%) died within one yr. No deaths were attributed to CDI. Recurrent episode was a major predictor of treatment failure, suggesting that research into development of therapeutic options for recurrent disease is needed.