Medication Summary
S marcescens is naturally resistant to ampicillin, macrolides, and first-generation cephalosporins. In Taiwan, 92% of the strains are resistant to cefotaxime, but 99% are still susceptible to ceftazidime. Extended spectrum beta-lactamases are produced by most S marcescens strains.[25]
Serratia infections should be treated with an aminoglycoside plus an antipseudomonal beta-lactam, as the single use of a beta-lactam can select for resistant strains. Most strains are susceptible to amikacin, but reports indicate increasing resistance to gentamicin and tobramycin. Quinolones also are highly active against most strains.
Definitive therapy should be based on the results of susceptibility testing because multiresistant strains are common.
Antibiotics
Class Summary
Empiric antimicrobial therapy should cover all likely pathogens in the context of the clinical setting.
Levofloxacin (Levaquin)
For pseudomonal infections and infections due to multidrug-resistant gram-negative organisms.
Cefepime (Maxipime)
Fourth-generation cephalosporin. Gram-negative coverage comparable to ceftazidime but has better gram-positive coverage (comparable to ceftriaxone). Cefepime is a zwitter ion; rapidly penetrates gram-negative cells. Best beta-lactam for IM administration. Poor capacity to cross blood-brain barrier precludes use for treatment of meningitis.
Ertapenem (Invanz)
Bactericidal activity results from inhibition of cell wall synthesis and is mediated through ertapenem binding to penicillin-binding proteins. Stable against hydrolysis by various beta-lactamases including penicillinases, cephalosporinases, and extended-spectrum beta-lactamases. Hydrolyzed by metallo-beta-lactamases.
Amikacin (Amikin)
Preferred aminoglycoside. Usually synergistic with antipseudomonal beta-lactams. Use both in combination, pending results of susceptibility testing. For gram-negative bacterial coverage of infections resistant to gentamicin and tobramycin. Effective against Pseudomonas aeruginosa. Irreversibly binds to 30S subunit of bacterial ribosomes. Blocks recognition step in protein synthesis. Causes bacterial growth inhibition.
Aztreonam (Azactam)
Usually synergistic with amikacin. Use both in combination, pending results of susceptibility testing. A monobactam that inhibits cell wall synthesis during bacterial growth. Active against gram-negative bacilli.
Meropenem (Merrem IV)
Preferred therapy for Serratia meningitis. Bactericidal broad-spectrum carbapenem antibiotic that inhibits cell wall synthesis. Effective against most gram-positive and gram-negative bacteria. Has increased activity against gram-negative bacteria and slightly decreased activity against staphylococci and streptococci compared to imipenem.
Imipenem-cilastatin (Primaxin)
Comparable in activity to meropenem.
Ciprofloxacin (Cipro)
Greatest anti-P aeruginosa activity among the quinolones. May be particularly useful for isolates resistant to the aminoglycosides.
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