Hypoxic-Ischemic Encephalopathy Clinical Trial
Official title:
Remote Ischemic Conditioning in Hypoxic-Ischemic Encephalopathy: A Safety and Feasibility Trial
Remote Ischemic Conditioning has never been studied in neonates with HIE. However, RIC has been studied in animal models of perinatal asphyxia and has shown encouraging results. In neonatal rats with HIE, RIC is associated with reduced sensory motor deficits compared to non-RIC, and repeated cycles in three consecutive days is superior to a single treatment. In piglets, four cycles of 10 minutes of bilateral hindlimb ischemia immediately after bilateral common carotid occlusion results in reduced cell death in the periventricular white matter and internal capsule. These preclinical studies support the hypothesis that RIC may be beneficial in infants with HIE.
Hypoxic-ischemic encephalopathy (HIE) is a devastating condition in which newborn infants are deprived of oxygen in the peripartum period, resulting in brain injury. HIE is a leading cause of infant morbidity and mortality worldwide. Within the last 15 years, the introduction of hypothermia as a therapy for HIE has revolutionized our care of these vulnerable infants, but despite these improvements, nearly 50% of infants die or have major disability at 18 months. Therefore, there is a significant need to develop novel adjunctive therapies for HIE. Remote ischemic conditioning (RIC) is a procedure that involves the application of brief cycles of non-lethal ischemia and reperfusion to a remote site, with the goal of protecting distant organs exposed to ischemic injury. RIC has been extensively studied in experimental models and applied clinically in adults, children, and neonates. In neonates, there have been trials exploring its potential role before cardiac surgery and necrotizing enterocolitis. Most of these studies performed up to 4 cycles of 5 minutes of ischemia in a single day and found RIC to be feasible and safe. Experimental studies suggest that RIC, acting through three inter-related mechanisms (neural, humoral, and systemic pathways) is associated with increased cerebral blood flow, decreased inflammation, and enhanced cell survival. RIC has been studied as a potential treatment in adult stroke, and while the evidence to date is inconclusive, preliminary data suggest that RIC may reduce the size and the severity of the stroke lesion, as well as improve cognitive outcomes. RIC has been studied in animal models of perinatal asphyxia and has shown encouraging results. In neonatal rats with HIE, RIC is associated with reduced sensory motor deficits compared to non-RIC, and repeated cycles in three consecutive days is superior to a single treatment. In piglets, four cycles of 10 minutes of bilateral hindlimb ischemia immediately after bilateral common carotid occlusion results in reduced cell death in the periventricular white matter and internal capsule. These preclinical studies support the hypothesis that RIC may be beneficial in infants with HIE. In this proposal, we outline a carefully designed and conducted early phase study of RIC in neonates with HIE. ;
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