How to manage Pseudomonas aeruginosa infections

Abstract

Infections with Pseudomonas aeruginosa have become a real concern in hospital-acquired infections, especially in critically ill and immunocompromised patients. The major problem leading to high mortality lies in the appearance of drug-resistant strains. Therefore, a vast number of approaches to develop novel anti-infectives is currently pursued. Diverse strategies range from killing (new antibiotics) to disarming (antivirulence) the pathogen. In this review, selected aspects of P. aeruginosa antimicrobial resistance and infection management will be addressed. Many studies have been performed to evaluate the risk factors for resistance and the potential consequences on mortality and attributable mortality. The review also looks at the mechanisms associated with resistance - P. aeruginosa is a pathogen presenting a large genome, and it can develop a large number of factors associated with antibiotic resistance involving almost all classes of antibiotics. Clinical approaches to patients with bacteremia, ventilator-associated pneumonia, urinary tract infections and skin soft tissue infections are discussed. Antibiotic combinations are reviewed as well as an analysis of pharmacokinetic and pharmacodynamic parameters to optimize P. aeruginosa treatment. Limitations of current therapies, the potential for alternative drugs and new therapeutic options are also discussed.

Keywords: Pseudomonas aeruginosa; bloodstream infection; ceftazidime-avibactam; ceftolozane-tazobactam; multidrug resistance; new antibiotics; ventilator associated pneumonia.

Figure 1

Clinical approach to patients with suspected P. aeruginosa infection. BSI: Bloodstream infection; COPD: Chronic obstructive pulmonary disease; IAI: Intra-abdominal infections; LTCFs: Long term care facilities; UTI: Urinary tract infection; VAP: Ventilator associated pneumonia.