Gram-negative bacteremias. Analysis of factors for clinical assessment of gentamicin resistance

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Abstract
The charts of 163 patients with 183 episodes of gram-negative bacillary bacteremia were reviewed to determine a clinical profile that would select patients at high risk for experiencing gentamicin-sulfate-resistant gram-negative bacillary bacteremia. Gentamicin-resistant gram-negative bacilli were only associated with institution-acquired bacteremia. Among institution-acquired episodes, urinary tract infection, diagnostic or therapeutic procedures of the lower respiratory tract or urinary tract, presence of pneumonic infiltrate on chest roentgenogram, prior therapy with gentamicin and prior therapy with other antibiotics were significant risk factors. Because only 2 of the 29 gentamicin-resistant bacteria that were tested against amikacin base were resistant to amikacin, an initial treatment with amikacin was advocated for patients with evidence of an institution-acquired gram-negative bacteremic episode. Gentamicin was still the initial choice for a community-acquired episode.

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