Tyler Miller, MD

Background: National guidelines recommend that surgical prophylactic antimicrobials be initiated within 1 hour prior to incision and discontinued 24 hours postoperatively. However, the risks and benefits of longer duration of antimicrobials are uncertain.

Study design: Retrospective cohort study.

Setting: Veterans Affairs hospitals.

Synopsis: After stratification by type of surgery and adjustment for covariates, antibiotic prophylaxis greater than 24 hours was not associated with lower SSI risk.

However, the odds of postoperative AKI increased with each additional day of prophylaxis (adjusted odds ratios, 1.82; 95% confidence interval,1.54-2.16 and aOR, 1.79; 95% CI, 1.27-2.53) with longer than 72 hours prophylaxis for cardiac and noncardiac surgery, respectively). Similarly, C. difficile infections increased with each additional day beyond 24 hours (aOR, 3.65; 95% CI, 2.40-5.55 with more than 72 hours of use).

Bottom line: Each day of perioperative antimicrobial prophylaxis beyond 24 hours increases the risk for postoperative AKI or C. difficile infection without reducing the risk of surgical site infection.

Citation: Branch-Elliman W et al. Association of duration and type of surgical prophylaxis with antimicrobial-associated adverse events. JAMA Surg. 2019 Apr 24. doi: 10.1001/jamasurg.2019.0569.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.

Background: National guidelines recommend that surgical prophylactic antimicrobials be initiated within 1 hour prior to incision and discontinued 24 hours postoperatively. However, the risks and benefits of longer duration of antimicrobials are uncertain.

Study design: Retrospective cohort study.

Setting: Veterans Affairs hospitals.

Synopsis: After stratification by type of surgery and adjustment for covariates, antibiotic prophylaxis greater than 24 hours was not associated with lower SSI risk.

However, the odds of postoperative AKI increased with each additional day of prophylaxis (adjusted odds ratios, 1.82; 95% confidence interval,1.54-2.16 and aOR, 1.79; 95% CI, 1.27-2.53) with longer than 72 hours prophylaxis for cardiac and noncardiac surgery, respectively). Similarly, C. difficile infections increased with each additional day beyond 24 hours (aOR, 3.65; 95% CI, 2.40-5.55 with more than 72 hours of use).

Bottom line: Each day of perioperative antimicrobial prophylaxis beyond 24 hours increases the risk for postoperative AKI or C. difficile infection without reducing the risk of surgical site infection.

Citation: Branch-Elliman W et al. Association of duration and type of surgical prophylaxis with antimicrobial-associated adverse events. JAMA Surg. 2019 Apr 24. doi: 10.1001/jamasurg.2019.0569.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.

Background: National guidelines recommend that surgical prophylactic antimicrobials be initiated within 1 hour prior to incision and discontinued 24 hours postoperatively. However, the risks and benefits of longer duration of antimicrobials are uncertain.

Study design: Retrospective cohort study.

Setting: Veterans Affairs hospitals.

Synopsis: After stratification by type of surgery and adjustment for covariates, antibiotic prophylaxis greater than 24 hours was not associated with lower SSI risk.

However, the odds of postoperative AKI increased with each additional day of prophylaxis (adjusted odds ratios, 1.82; 95% confidence interval,1.54-2.16 and aOR, 1.79; 95% CI, 1.27-2.53) with longer than 72 hours prophylaxis for cardiac and noncardiac surgery, respectively). Similarly, C. difficile infections increased with each additional day beyond 24 hours (aOR, 3.65; 95% CI, 2.40-5.55 with more than 72 hours of use).

Bottom line: Each day of perioperative antimicrobial prophylaxis beyond 24 hours increases the risk for postoperative AKI or C. difficile infection without reducing the risk of surgical site infection.

Citation: Branch-Elliman W et al. Association of duration and type of surgical prophylaxis with antimicrobial-associated adverse events. JAMA Surg. 2019 Apr 24. doi: 10.1001/jamasurg.2019.0569.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.

Background: NRT use after smoking cessation helps smokers transition to abstinence by reducing the intensity of craving and withdrawal symptoms. It is uncertain which forms of NRTs are more likely to result in long-term smoking cessation.

Study design: Meta-analysis.

Setting: Cochrane review of randomized trials.

Synopsis: In this Cochrane Review, the authors identified 63 randomized trials with 41,509 participants comparing one type of NRT with another.

Combination NRT (for example, the patch & a fast-acting form such as gum or lozenge) increases long-term quit rates versus single-form NRT (risk ratio, 1.25; 95% confidence interval, 1.15-1.36). Researchers compared 4 mg to 2 mg nicotine gum and found a benefit of the higher dose (RR, 1.43; 95% CI, 1.12-1.83), although possibly only among heavy users.

Bottom line: Prescribe combination patch and short-acting NRTs to smokers motivated to quit.

Citation: Lindson N et al. Different doses, durations, and modes of delivery of nicotine replacement therapy for smoking cessation. Cochrane Database Syst Rev. 2019 Apr 18;4:CD013308. doi: 10.1002/14651858.CD013308.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.

Background: NRT use after smoking cessation helps smokers transition to abstinence by reducing the intensity of craving and withdrawal symptoms. It is uncertain which forms of NRTs are more likely to result in long-term smoking cessation.

Study design: Meta-analysis.

Setting: Cochrane review of randomized trials.

Synopsis: In this Cochrane Review, the authors identified 63 randomized trials with 41,509 participants comparing one type of NRT with another.

Combination NRT (for example, the patch & a fast-acting form such as gum or lozenge) increases long-term quit rates versus single-form NRT (risk ratio, 1.25; 95% confidence interval, 1.15-1.36). Researchers compared 4 mg to 2 mg nicotine gum and found a benefit of the higher dose (RR, 1.43; 95% CI, 1.12-1.83), although possibly only among heavy users.

Bottom line: Prescribe combination patch and short-acting NRTs to smokers motivated to quit.

Citation: Lindson N et al. Different doses, durations, and modes of delivery of nicotine replacement therapy for smoking cessation. Cochrane Database Syst Rev. 2019 Apr 18;4:CD013308. doi: 10.1002/14651858.CD013308.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.

Background: NRT use after smoking cessation helps smokers transition to abstinence by reducing the intensity of craving and withdrawal symptoms. It is uncertain which forms of NRTs are more likely to result in long-term smoking cessation.

Study design: Meta-analysis.

Setting: Cochrane review of randomized trials.

Synopsis: In this Cochrane Review, the authors identified 63 randomized trials with 41,509 participants comparing one type of NRT with another.

Combination NRT (for example, the patch & a fast-acting form such as gum or lozenge) increases long-term quit rates versus single-form NRT (risk ratio, 1.25; 95% confidence interval, 1.15-1.36). Researchers compared 4 mg to 2 mg nicotine gum and found a benefit of the higher dose (RR, 1.43; 95% CI, 1.12-1.83), although possibly only among heavy users.

Bottom line: Prescribe combination patch and short-acting NRTs to smokers motivated to quit.

Citation: Lindson N et al. Different doses, durations, and modes of delivery of nicotine replacement therapy for smoking cessation. Cochrane Database Syst Rev. 2019 Apr 18;4:CD013308. doi: 10.1002/14651858.CD013308.

Dr. Miller is a hospitalist at the University of Colorado at Denver, Aurora.