Correlation of pharmacokinetic indices with therapeutic outcome in patients receiving aminoglycosides

L. M. Deziel-Evans, John E Murphy, M. L. Job

Research output: Contribution to journalArticle

69 Citations (Scopus)

Abstract

The influence of five pharmacokinetic indices on therapeutic response was retrospectively studied in 45 adult patients treated with aminoglycosides for bacterial infections. Subjects were treated for a minimum of five days, had culture and sensitivity reports, and had at least one set of steady-state peak and trough serum aminoglycoside concentrations. Serum drug concentrations were determined by enzyme-multiplied immunoassay or by fluorescence polarization assay. Minimum inhibitory concentrations (MICs) for the drugs were determined by microdilution assays. Cure was determined by negative cultures or absence of clinical evidence of infection. Values for five pharmacokinetic indices were determined for each patient: (1) ratio of steady-state peak serum concentration to MIC (C(ssmax)/MIC); (2) time that the serum concentration remained above the MIC during a 72-hour period (t(supra-MIC)(72)); (3) the intensity index for a 72-hour period (II(72)), which is related but not identical to the area under the curve (AUC), reflecting the contributions of C(ssmax)/MIC and t(supra-MIC)(72); (4) times that the serum concentration was greater than four times the MIC during a 72-hour period (t(supra-(4 x MIC)(72)), and (5) the intensity index related but not identical to AUC greater than four times the MIC (II(4 x MIC)(72)), which reflects the contribution of C(ssmax)/(4 x MIC) and t(supra-(4 x MIC)(72). Statistical analysis revealed significant correlations between each of the five indices and the patients' therapeutic responses. The following index values were associated with cures: (1) C(ssmax)/MIC greater than 4 (and ideally greater than 8); (2) t(supra-MIC)(72) of at least 40 hours; (3) t(supra-(4 x MIC)(72) of at least 10 hours; (4) II(72) greater than 400; and (5) II(4 x MIC)(72) greater than 50. All five pharmacokinetic indices were good predictors of patient outcome. The ratio of maximum steady-state serum aminoglycoside concentration to minimum inhibitory concentration is the index most easily monitored and interpreted.

Original languageEnglish (US)
Pages (from-to)319-324
Number of pages6
JournalClinical Pharmacy
Volume5
Issue number4
StatePublished - 1986
Externally publishedYes

Fingerprint

Microbial Sensitivity Tests
Aminoglycosides
Pharmacokinetics
Therapeutics
Serum
Area Under Curve
Fluorescence Polarization
Immunoenzyme Techniques
Bacterial Infections

ASJC Scopus subject areas

  • Pharmaceutical Science

Cite this

Correlation of pharmacokinetic indices with therapeutic outcome in patients receiving aminoglycosides. / Deziel-Evans, L. M.; Murphy, John E; Job, M. L.

In: Clinical Pharmacy, Vol. 5, No. 4, 1986, p. 319-324.

Research output: Contribution to journalArticle

@article{eed2794babcb4266967dc9964b1e54cf,
title = "Correlation of pharmacokinetic indices with therapeutic outcome in patients receiving aminoglycosides",
abstract = "The influence of five pharmacokinetic indices on therapeutic response was retrospectively studied in 45 adult patients treated with aminoglycosides for bacterial infections. Subjects were treated for a minimum of five days, had culture and sensitivity reports, and had at least one set of steady-state peak and trough serum aminoglycoside concentrations. Serum drug concentrations were determined by enzyme-multiplied immunoassay or by fluorescence polarization assay. Minimum inhibitory concentrations (MICs) for the drugs were determined by microdilution assays. Cure was determined by negative cultures or absence of clinical evidence of infection. Values for five pharmacokinetic indices were determined for each patient: (1) ratio of steady-state peak serum concentration to MIC (C(ssmax)/MIC); (2) time that the serum concentration remained above the MIC during a 72-hour period (t(supra-MIC)(72)); (3) the intensity index for a 72-hour period (II(72)), which is related but not identical to the area under the curve (AUC), reflecting the contributions of C(ssmax)/MIC and t(supra-MIC)(72); (4) times that the serum concentration was greater than four times the MIC during a 72-hour period (t(supra-(4 x MIC)(72)), and (5) the intensity index related but not identical to AUC greater than four times the MIC (II(4 x MIC)(72)), which reflects the contribution of C(ssmax)/(4 x MIC) and t(supra-(4 x MIC)(72). Statistical analysis revealed significant correlations between each of the five indices and the patients' therapeutic responses. The following index values were associated with cures: (1) C(ssmax)/MIC greater than 4 (and ideally greater than 8); (2) t(supra-MIC)(72) of at least 40 hours; (3) t(supra-(4 x MIC)(72) of at least 10 hours; (4) II(72) greater than 400; and (5) II(4 x MIC)(72) greater than 50. All five pharmacokinetic indices were good predictors of patient outcome. The ratio of maximum steady-state serum aminoglycoside concentration to minimum inhibitory concentration is the index most easily monitored and interpreted.",
author = "Deziel-Evans, {L. M.} and Murphy, {John E} and Job, {M. L.}",
year = "1986",
language = "English (US)",
volume = "5",
pages = "319--324",
journal = "Clinical Pharmacy",
issn = "0278-2677",
publisher = "American Society of Hospital Pharmacists",
number = "4",

}

TY - JOUR

T1 - Correlation of pharmacokinetic indices with therapeutic outcome in patients receiving aminoglycosides

AU - Deziel-Evans, L. M.

AU - Murphy, John E

AU - Job, M. L.

PY - 1986

Y1 - 1986

N2 - The influence of five pharmacokinetic indices on therapeutic response was retrospectively studied in 45 adult patients treated with aminoglycosides for bacterial infections. Subjects were treated for a minimum of five days, had culture and sensitivity reports, and had at least one set of steady-state peak and trough serum aminoglycoside concentrations. Serum drug concentrations were determined by enzyme-multiplied immunoassay or by fluorescence polarization assay. Minimum inhibitory concentrations (MICs) for the drugs were determined by microdilution assays. Cure was determined by negative cultures or absence of clinical evidence of infection. Values for five pharmacokinetic indices were determined for each patient: (1) ratio of steady-state peak serum concentration to MIC (C(ssmax)/MIC); (2) time that the serum concentration remained above the MIC during a 72-hour period (t(supra-MIC)(72)); (3) the intensity index for a 72-hour period (II(72)), which is related but not identical to the area under the curve (AUC), reflecting the contributions of C(ssmax)/MIC and t(supra-MIC)(72); (4) times that the serum concentration was greater than four times the MIC during a 72-hour period (t(supra-(4 x MIC)(72)), and (5) the intensity index related but not identical to AUC greater than four times the MIC (II(4 x MIC)(72)), which reflects the contribution of C(ssmax)/(4 x MIC) and t(supra-(4 x MIC)(72). Statistical analysis revealed significant correlations between each of the five indices and the patients' therapeutic responses. The following index values were associated with cures: (1) C(ssmax)/MIC greater than 4 (and ideally greater than 8); (2) t(supra-MIC)(72) of at least 40 hours; (3) t(supra-(4 x MIC)(72) of at least 10 hours; (4) II(72) greater than 400; and (5) II(4 x MIC)(72) greater than 50. All five pharmacokinetic indices were good predictors of patient outcome. The ratio of maximum steady-state serum aminoglycoside concentration to minimum inhibitory concentration is the index most easily monitored and interpreted.

AB - The influence of five pharmacokinetic indices on therapeutic response was retrospectively studied in 45 adult patients treated with aminoglycosides for bacterial infections. Subjects were treated for a minimum of five days, had culture and sensitivity reports, and had at least one set of steady-state peak and trough serum aminoglycoside concentrations. Serum drug concentrations were determined by enzyme-multiplied immunoassay or by fluorescence polarization assay. Minimum inhibitory concentrations (MICs) for the drugs were determined by microdilution assays. Cure was determined by negative cultures or absence of clinical evidence of infection. Values for five pharmacokinetic indices were determined for each patient: (1) ratio of steady-state peak serum concentration to MIC (C(ssmax)/MIC); (2) time that the serum concentration remained above the MIC during a 72-hour period (t(supra-MIC)(72)); (3) the intensity index for a 72-hour period (II(72)), which is related but not identical to the area under the curve (AUC), reflecting the contributions of C(ssmax)/MIC and t(supra-MIC)(72); (4) times that the serum concentration was greater than four times the MIC during a 72-hour period (t(supra-(4 x MIC)(72)), and (5) the intensity index related but not identical to AUC greater than four times the MIC (II(4 x MIC)(72)), which reflects the contribution of C(ssmax)/(4 x MIC) and t(supra-(4 x MIC)(72). Statistical analysis revealed significant correlations between each of the five indices and the patients' therapeutic responses. The following index values were associated with cures: (1) C(ssmax)/MIC greater than 4 (and ideally greater than 8); (2) t(supra-MIC)(72) of at least 40 hours; (3) t(supra-(4 x MIC)(72) of at least 10 hours; (4) II(72) greater than 400; and (5) II(4 x MIC)(72) greater than 50. All five pharmacokinetic indices were good predictors of patient outcome. The ratio of maximum steady-state serum aminoglycoside concentration to minimum inhibitory concentration is the index most easily monitored and interpreted.

UR - http://www.scopus.com/inward/record.url?scp=0022528827&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022528827&partnerID=8YFLogxK

M3 - Article

C2 - 3709080

AN - SCOPUS:0022528827

VL - 5

SP - 319

EP - 324

JO - Clinical Pharmacy

JF - Clinical Pharmacy

SN - 0278-2677

IS - 4

ER -