PEDIATRICS Vol. 103 No. 2 February 1999, pp. 495-496
| The first 20% of the full text of this article appears below. |
Caregivers and third-party payors
need additional information from the Impact study1
investigators to determine the appropriate use of palivizumab (Synagis)
in select premature infants with increased risk of respiratory
syncytial virus (RSV)-associated hospitalization. The primary outcome
variable of hospitalization within 30 days of the last dose of
palivizumab may have missed patients who actually became ill with RSV
later in the epidemic under study. Could the investigators provide data
on the incidence of RSV hospitalization beyond the 30-day
post-palivizumab cut point for each group in the IMpact study? Although
the published study design may have provided an adequate outcome to
demonstrate drug efficacy for Food and Drug Administration approval,
failure to consider RSV hospitalization later in the epidemic (beyond 30 days after the fifth dose of palivizumab) would likely result in a
discrepancy in palivizumab's true effectiveness in actual clinical
practice compared with its efficacy under ideal study conditions of the
randomized clinical trial. In addition, under actual clinical practice
conditions, one would not anticipate palivizumab to be as effective as
described under efficacy study conditions for other reasons such as
missing or untimely palivizumab injections. Furthermore, under the
IMpact study conditions, the control group may have been exposed to RSV
infection to an extent greater than had they not participated in the
study. The general study conditions of the 139 centers where patients
waited until
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