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Objective: To investigate the effect of music therapy on infants who underwent mechanical ventilation after cardiac surgery.Methods: A prospective randomized controlled study was conducted in a provincial hospital in southeast China. The subjects were randomly divided into the music therapy (MT) group and the control group. Both groups were given standardized sedation treatment and routine nursing. Infants in the MT group received 60 min of MT three times a day. The sedation medication, Richmond sedation agitation scale (RASS) score, incidence of delirium, mechanical ventilation duration, length of cardiac intensive care unit (CICU) stay, restraint belt use time, and successful ventilation withdrawal rate were collected.Results: Infants in the control group had a higher total amount of on-demand midazolam (p = .039). Infants in the MT group had a significantly lower incidence of delirium, shorter mechanical ventilation duration, and restraint band use time (p = .047, p = .046, and p = .038, respectively). Although infants in the MT group had a higher success rate of ventilation withdrawal, lower RASS scores, and shorter ICU stay, the difference was not statistically significant (p = .427, p = .585, and p = .068, respectively).Conclusion: MT in the ICU can reduce the use of on-demand sedative drugs, shorten mechanical ventilation, and reduce the occurrence of delirium in infants who underwent mechanical ventilation after cardiac surgery. MT is a safe and reliable treatment and worthy of clinical application. [ABSTRACT FROM AUTHOR]