JOURNAL ARTICLE
OBSERVATIONAL STUDY
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Opioid and Benzodiazepine Withdrawal Syndrome in PICU Patients: Which Risk Factors Matter?

BACKGROUND AND AIMS: Although iatrogenic withdrawal syndrome (IWS) has been recognized in patients exposed to opioids and benzodiazepines, very few studies have used a validated tool for diagnosis and assessment of IWS in critically ill children. We sought to determine IWS rate, risk factors, and outcomes of IWS patients.

METHODS: Prospective observational study conducted in a pediatric intensive care unit. A total of 137 patients (31 with IWS and 106 with no IWS) received a continuous infusion of fentanyl and midazolam for 3 or more days. The Sophia Observation withdrawal Symptoms scale was repeatedly applied when children were weaned off sedation/analgesia.

RESULTS: The overall incidence of IWS was 22.6%. Of the 31 IWS patients, 6 showed IWS with less than 5 days sedation or analgesia. Logistic regression showed that the median peak dose of midazolam was associated with IWS development (odds ratio 1.4). Receiver-operating curve showed a cut-off value of 0.35 mg/kg/h for midazolam peak dose (sensitivity 96.7%, specificity 51%, positive predictive value 36.6%, and negative predictive value 98.2%), with area under the curve of 0.80. IWS patients had a longer time on mechanical ventilation, prolonged pediatric intensive care unit, and hospital stays, and required prolonged period to have drugs discontinued.

CONCLUSIONS: Although length of sedation/analgesia for at least5 days has been widely proposed for monitoring IWS, our data suggest that initiating monitoring after 3 sedation days is highly recommended. In addition, patients requiring infusion rates of midazolam above 0.35 mg/kg/h should be considered at high risk for IWS.

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