Monotherapy versus combination for the treatment of Stenotrophomonas maltophilia: a multicenter cohort study.

BACKGROUND: The aim of this study was to compare the safety and effectiveness of monotherapy versus combination therapy for the treatment of infections caused by S. maltophilia. METHODS: This retrospective, multicenter, cohort study included patients treated with either monotherapy or combination therapy for infections caused by S. maltophilia. Primary outcomes included overall in-hospital mortality, 30-day mortality, and clinical cure. Safety outcomes were also evaluated. Multivariable logistic regression was used as a control for confounding variables. RESULTS: A total of 407 patients were included, 330 patients received monotherapy and 77 patients received combination therapy. A total of 21% presented with concomitant bacteremia. After adjusting the differences between the two groups, there were no statistically significant differences between patients who received monotherapy versus combination therapy in clinical cure (55% vs 65%; OR, 0.72; 95% CI, 0.40-1.31) and overall in-hospital mortality (52% vs 49%; OR, 0.84; 95% CI, 0.45-1.57). However, patients who received monotherapy had a lower rate of 30-day mortality (28% vs 32%; OR, 0.45; 95% CI, 0.22-0.90) and acute kidney injury (9% vs 18%; OR, 0.35; 95% CI, 0.16-0.78). CONCLUSION: Clinical outcomes did not significantly differ in patients who received combination therapy versus monotherapy. More data are needed to validate these findings.

Ceftolozane-tazobactam vs. colistin for the treatment of infections due to multidrug-resistant Pseudomonas aeruginosa: a multicentre cohort study.

OBJECTIVES: The aim of this study was to compare the safety and effectiveness of ceftolozane-tazobactam (C-T) to colistin-based regimen for treating infections caused by multidrug-resistant (MDR) Pseudomonas aeruginosa. METHODS: This was a retrospective, multicentre, observational cohort study of inpatients who received either C-T or intravenous colistin for treating infections caused by MDR P. aeruginosa. The study was conducted in five tertiary care hospitals in Saudi Arabia. The main study outcomes included clinical cure at end of treatment, in-hospital mortality, and acute kidney injury (AKI). Univariate analysis and multivariate logistic regression model were conducted to evaluate the independent effect of C-T on the clinical outcome. RESULTS: A total of 184 patients were included in the study: 82 patients received C-T, and 102 patients received colistin-based regimen. Clinical cure (77% vs. 57%; P = 0.005; OR, 2.52; 95% CI, 1.32-4.79) was significantly more common in patients who received C-T. After adjusting the difference between the two groups, treatment with C-T is independently associated with clinical cure (adjusted OR, 2.47; 95% CI, 1.16-5.27). In-hospital mortality (39% vs. 49%; P = 0.175; OR, 0.67; 95% CI, 0.37-1.20) was lower in patients who received C-T, but the difference was not significant. AKI (15% vs. 41%; P < 0.001; OR, 0.25; 95% CI, 0.12-0.51) was significantly less common in patients who received C-T. CONCLUSION: C-T is associated with a higher rate of clinical cure and lower rate of AKI compared to colistin. Our findings support the preferential use of C-T over colistin-based regimen for treating these infections.

Prevalence and outcome of isoniazid-monoresistant tuberculosis at a university hospital in Saudi Arabia.

OBJECTIVES: To determine the prevalence and outcome in patients with isoniazid-monoresistant Mycobacterium tuberculosis complex and compare them to those in patients with non-isoniazid-monoresistant Mycobacterium tuberculosis. METHODS: This cross-sectional analytical study was conducted at King Khalid University Hospital, Riyadh, Saudi Arabia. The data were retrospectively collected from the electronic medical records of patients who tested positive for Mycobacterium tuberculosis between May 2015 and April 2019. RESULTS: We identified 105 patients infected with Mycobacterium tuberculosis. The prevalence proportion of isoniazid-monoresistant tuberculosis was 8.6% (n=9). Five patients with isoniazid-monoresistant tuberculosis (55.6%) were successfully treated, while one patient died. In the nonresistant population, 51 (53.1%) patients were successfully treated. However, 12 (12.5%) patients with no isoniazid resistance had an unsuccessful treatment outcome. The resistant group had a longer treatment duration with a mean of 12 months compared to the non-isoniazid-resistant group, with a mean treatment duration of 9.5 months. Twenty-eight patients (26.7%) had adverse events, with the majority of them being in the non-isoniazid-resistant group. CONCLUSION: Isoniazid monoresistance is the most common form of drug resistance found in our population. Our study has not shown any significance in the outcome of isoniazid-resistant cases compared to non-isoniazid-resistant cases. This may be due to the low number of isoniazid-monoresistant cases in our population.