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This prospective study describes chemotherapy-induced nausea and vomiting (CINV) in children (4–18 years) receiving their first hematopoietic stem cell transplant. Emetic episodes, nausea severity (assessed using a validated, self-report nausea severity assessment tool) and antiemetic administration were documented from the start of conditioning until 24 h after the last conditioning agent was administered (acute) and for a further 7 days (delayed). Relationships between CINV control and parenteral nutrition (PN) use and acute gut GvHD (aGvHD) were explored. Fifty-nine children (4.6–17.4 years) were evaluable. Complete chemotherapy-induced vomiting (CIV; acute: 24%; delayed 22%) and chemotherapy-induced nausea (CIN; acute 7%; delayed 12%) control rates were low. Few children experienced complete CINV control (no vomiting/retching and no nausea) during the acute (5%) or delayed phases (12%). Children experiencing complete acute or delayed CIN control or complete delayed CIV control were more likely to have received: a lower proportion of their total energy requirement as PN at the end of the delayed phase (P<0.036) and PN for a shorter time (P<0.044). Low patient numbers did not permit evaluation of the association between gut aGvHD and CINV control. Effective and safe interventions aimed at improving CINV control in children are required.