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American Academy of Pediatrics
INFECTIOUS DISEASES

COST-EFFECTIVENESS OF NEWER TREATMENT STRATEGIES FOR INFLUENZA

Allen Adinoff
Pediatrics August 2003, 112 (Supplement 2) 493;
Allen Adinoff
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Smith KJ, Roberts MS. Am J Med. 2002;113:300–307

Purpose of the Study.

Recent advances in the diagnosis and treatment of influenza, such as rapid testing and neuraminidase inhibitor therapy, are available, but their place in clinical practice and their cost-effectiveness have not been determined.

Patient Population and Methods.

To estimate the cost-effectiveness of these newer interventions, we used a decision model that compared several influenza management strategies: no testing or treatment, amantadine or rimantadine treatment without testing, testing then amantadine or rimantadine treatment, neuraminidase inhibitor treatment without testing, or testing then neuraminidase inhibitor treatment. Antiviral therapy began within 48 hours in febrile patients with characteristic symptoms of influenza. We assumed that antiviral treatment did not change rates of influenza complication or mortality, and chose parameter values in the baseline analysis to bias slightly against antiviral treatment and toward testing strategies.

Results.

In the baseline analysis, testing strategies are more expensive and less effective than treatment strategies. Amantadine costs $9.06 per illness day avoided or $11.60 per quality-adjusted day gained. Compared with amantadine, zanamivir costs $198 per illness day avoided or $185 per quality-adjusted day gained, whereas oseltamivir costs $252 per illness day avoided or $235 per quality-adjusted day gained. In elderly patients who require reduced dosage, rimantadine costs $128 per quality-adjusted day gained compared with amantadine. In younger patients, amantadine is favored if the likelihood of influenza A is >67%; otherwise, neuraminidase inhibitors are favored. Testing strategies are more costly and less effective when the influenza probability is >30%. No testing or treatment is favored if the influenza probability is <32% and the influenza utility is >0.77. In elderly patients, amantadine is favored over rimantadine if the utility of medication side effects is >0.94.

Conclusions.

Antiviral treatment of influenza without rapid testing is reasonable economically in febrile patients with typical symptoms during influenza season. The choice of antiviral agent depends on age, the likelihood of influenza A, and the willingness to pay per quality-adjusted day gained.

Reviewer’s Comments.

I found this analysis to be very interesting, in part because I agreed with the conclusions. In my experience, the ability to use these agents is limited and their effectiveness (even when taken before exposure) is of marginal benefit. Amantadine and rimantadine are generally effective, but only against influenza A. Side effects occur more commonly when taking antihistamines or anticholinergics. The neraminidase inhibitors are effective against A and B strains but are expensive, and zanamivir should not be used in patients with asthma. Usually by the time a patient presents with typical symptoms and you’ve managed to convince their insurance plan to cover the cost of the medication, it’s too late to treat. Patients would have been better off had they listened to their mothers when they told them: “Get a flu shot, Mister Big Shot!”

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Pediatrics
Vol. 112, Issue Supplement 2
1 Aug 2003
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COST-EFFECTIVENESS OF NEWER TREATMENT STRATEGIES FOR INFLUENZA
Allen Adinoff
Pediatrics Aug 2003, 112 (Supplement 2) 493;

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COST-EFFECTIVENESS OF NEWER TREATMENT STRATEGIES FOR INFLUENZA
Allen Adinoff
Pediatrics Aug 2003, 112 (Supplement 2) 493;
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More in this TOC Section

INFECTIOUS DISEASES

  • SAFETY OF THE TRIVALENT, COLD-ADAPTED INFLUENZA VACCINE IN PRESCHOOL-AGED CHILDREN
  • WINTER VIRUSES: INFLUENZA- AND RESPIRATORY SYNCYTIAL VIRUS-RELATED MORBIDITY IN CHRONIC LUNG DISEASE
Show more INFECTIOUS DISEASES

ABSTRACTS

  • SAFETY OF THE TRIVALENT, COLD-ADAPTED INFLUENZA VACCINE IN PRESCHOOL-AGED CHILDREN
  • WINTER VIRUSES: INFLUENZA- AND RESPIRATORY SYNCYTIAL VIRUS-RELATED MORBIDITY IN CHRONIC LUNG DISEASE
  • CORRECTION OF ADA-SCID BY STEM CELL GENE THERAPY COMBINED WITH NONMYELOABLATIVE CONDITIONING
Show more ABSTRACTS

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