Risk of neurodevelopmental abnormalities in children treated with propranolol

Central Effects of Beta-Blockers May Be Due to Nitric Oxide and Hydrogen Peroxide Release Independently of Their Ability to Cross the Blood-Brain Barrier

Propranolol is the first-line treatment for infants suffering from infantile hemangioma. Recently, some authors raised the question of potential neurologic side effects of propranolol due to its lipophilic nature and thus its ability to passively cross the blood-brain barrier (BBB) and accumulate into the brain. Hydrophilic beta-blockers, such as atenolol and nadolol, where therefore introduced in clinical practice. In addition to their classical mode of action in the brain, circulating factors may modulate the release of reactive oxygen/nitrogen species (ROS/RNS) from endothelial cells that compose the BBB without entering the brain. Due to their high capacity to diffuse across membranes, ROS/RNS can reach neurons and modify their activity. The aim of this study was to investigate other mechanisms of actions in which these molecules may display a central effect without actually crossing the BBB. We first performed an oral treatment in mice to measure the accumulation of propranolol, atenolol and nadolol in different brain regions in vivo. We then evaluated the ability of these molecules to induce the release of nitric oxide (NO) and hydrogen peroxide (H₂O₂) ex vivo in the hypothalamus. As expected, propranolol is able to cross the BBB and is found in brain tissue in higher amounts than atenolol and nadolol. However, all of these beta-blockers are able to induce the secretion of signaling molecules (i.e., NO and/or H₂O₂) in the hypothalamus, independently of their ability to cross the BBB, deciphering a new potential deleterious impact of hydrophilic beta-blockers in the brain.

Propranolol was effective in treating cutaneous infantile haemangiomas in Thai children

AIM

The aim of this study was to explore the efficacy and safety of propranolol in treating infantile haemangiomas, the most common benign vascular tumours in children.

METHODS

We carried out a retrospective chart review of infantile haemangioma patients admitted to the Faculty of Medicine, Khon Kaen University, Thailand, from January 2009 to January 2015.

RESULTS

There were 53 infantile haemangioma cases treated with oral propranolol. Treatment responses occurred as early as two weeks after propranolol administration in 91.5% of the follow-up patients, with all 53 cases achieving the desired treatment responses two months after propranolol was initiated. No significant differences in treatment responses were found between propranolol as a mono-therapy or as a combination therapy with prednisolone at the two-week (p value 0.13) and one-month follow-ups (p value 0.98). Complications were documented in three cases (5.6%) when the propranolol dose was increased, and these were asymptomatic hypoglycaemia in two cases and one case of hypotension.

CONCLUSION

Propranolol was effective in treating infantile haemangiomas, and combining it with prednisolone achieved no significant differences in treatment outcome. Cases should be monitored for hypoglycaemia and hypotension. More data on using propranolol for infantile haemangiomas are needed, including long-term follow-up studies.