Trial of Repeated Analgesia With Kangaroo Care - 18 Month Follow-up

Background: Infants in the Neonatal Intensive Care Unit receive an average of 7 painful procedures daily yet less than half receive interventions to manage pain. Importantly, there are adverse long-term effects associated with untreated pain. Moreover, the developmental trajectory of an infant born preterm is further compromised by prolonged periods of separation from their mothers during their hospital stay that also impacts mother-infant relationships. Thus, there is a crucial need to minimize procedural pain and associated consequences. Kangaroo Care (KC) is an effective strategy for reducing procedural pain and promoting mother-infant interactions in infants demonstrated in multiple clinical trials and systematic reviews. Not known is the impact of consistent KC for pain on long term outcomes. The primary aim for this study is to determine if maternal KC provided during painful procedures in early life will mitigate stress release and will improve neurobehavioural outcomes in infants, decrease subsequent pain response, and enhance maternal-child interaction beyond the period of hospitalization.

Research Design: Using a randomized clinical trial follow up design, mother-infant dyads taking part in the current CIHR and NSHRF-funded TRAKC trial (randomized to one of three interventions during all routine clinically necessary painful procedures for the duration of their initial neonatal intensive care unit hospital stay (KC/placebo; sucrose alone, considered to be standard care; or KC/ sucrose) will be compared on neurobehavioural outcomes up to 18 months.

Procedure: Eligible mother-infant dyads will be contacted prior to routine 2, 6, 12 and 18 month clinic visits where during these visits, infants will undergo an immunization and naturalistic observations will be recorded. Coders blinded to the study will score pain intensity and maternal comforting behavior using validated measures. At the 18 month visit, trained medical assessors blind to group assignment will perform the primary outcome measure, Bayley Scales of Infant Development (3rd ed) (BSID-III).

Outcomes: The investigators hypothesize that infants from the current TRAKC trial who were assigned to either KC group (alone or in combination with sucrose) when compared to those infants in the sucrose alone group will have: Primary outcome: H1. higher scores on the BSID-III at 18 months corrected postnatal age. Secondary outcomes: H2. higher scores in socio-affective development (Social-Emotional axis of the BSID-III and the Brief Infant Toddler Social Emotional Assessment (BITSEA); H3. lower scores on Negative Affectivity, higher scores on Surgency/Extraversion and Effortful Control as measured by the Early Childhood Behavior Questionnaire (ECBQ); H4. lower pain scores measured using the Modified Behavioral Pain Scale (MBPS) at 2, 6, 12, and 18 month;. H5. higher maternal infant interaction scores measured using Measure of Adult and Infant Soothing and Distress Scale (MAISD) at 2, 6, 12 and 18 months.

Sample size: The sample size is 159 mother-infant dyads at 18 months.