“We should consider two things before clinical decision of device closure,” Dr. Song said. First, exclude other causes of cryptogenic stroke; and second, conduct a comprehensive evaluation of the PFO to determine which patients are at highest risk and would be most likely to benefit from the procedure, he said.
To better determine which patients would benefit from the device implantation, Dr. Song and his colleagues used imaging to review data on the size and features of the PFO; patients with evidence of an atrial septal aneurysm or hypermobility (defined as a septal excursion 10 mm or larger) were deemed at especially high risk.
Dr. Song said that the next steps for research on management of PFOs include determining which medications are most effective in patients treated with medication alone, as well as clarifying the process of patient selection for device use based on PFO morphology.
The study was terminated early because of several factors, including low patient recruitment and the decision not to deny patients the closure treatment because of its demonstrated effectiveness, Dr. Song noted.