Does intravenous dexamethasone 0.25 mg/kg (8 mg/m2/dose) have an effect in the reduction of vomiting and retching after sedation with intravenous ketamine and lumbar puncture with intrathecal chemotherapy comparison with placebo?
Null hypothesis The proportions of vomiting are not different between dexamethasone and placebo in the patient after sedation with intravenous ketamine and lumbar puncture with intrathecal chemotherapy Alternative hypothesis The proportions of vomiting are different between dexamethasone and placebo in the patient after sedation with intravenous ketamine and lumbar puncture with intrathecal chemotherapy