Remote ischemic post-conditioning for neonatal encephalopathy: a safety and feasibility trial

Background

Despite implementation of therapeutic hypothermia (TH) for infants with neonatal encephalopathy (NE), a significant proportion of infants suffer neurodevelopmental impairment (NDI). Remote ischemic conditioning (RIC) is a proposed neuroprotective maneuver that has been studied in adults with brain injury, but it has not been previously investigated in infants with NE.

Methods

We performed a prospective, randomized, safety and dose escalation study in 32 neonates with NE. Four cohorts of consecutive patients were randomized to RIC therapy, including four cycles of limb ischemia and reperfusion on progressive days of TH, or sham. Clinical, biochemical, and safety outcomes were monitored in both groups.

Results

All patients received the designated RIC therapy without interruption or delay. RIC was not associated with increased pain, vascular, cutaneous, muscular, or neural safety events. There was no difference in the incidence of seizures, brain injury, or mortality between the two groups with the escalation of RIC dose and frequency.

Conclusions

We found that RIC is a safe and feasible adjunctive therapy for neonates with NE undergoing TH.

Impact

This pilot study establishes critical safety and feasibility data that are necessary for the design of future studies to investigate the potential efficacy of RIC to reduce NDI.

Impact

Remote ischemic conditioning (RIC) is a possible neuroprotective intervention in infants with hypoxic-ischemic encephalopathy (HIE).

RIC can be administered concurrently with therapeutic hypothermia without any notable adverse events.

Future studies will need to address potential efficacy of RIC to improve neurodevelopmental outcomes, as well as consider the ideal temporal window and dose for RIC in this patient population.