Cryptogenic stroke in a patient with a PFO: a decision analysis

Area of Science:

• Cardiology
• Neurology
• Medical Decision Making

Background:

• A high-profile stroke case involving a patient with a patent foramen ovale (PFO) highlighted public and expert debate on stroke management options.
• The patient experienced a transient ischemic attack, followed by anticoagulation, and subsequently a major intracerebral hemorrhage after PFO closure was considered.

Purpose of the Study:

• To systematically review the clinical case and perform a formal decision analysis.
• To identify the optimal management strategy for stroke prevention in patients with PFO, comparing anticoagulation, antiplatelets, PFO closure, and no treatment.

Main Methods:

• A decision tree analysis was constructed using the best available evidence.
• Sensitivity analyses were performed to assess the impact of various assumptions on the optimal treatment strategy.

Main Results:

• Optimal management decisions were critically sensitive to assumptions regarding stroke etiology, treatment efficacy, safety, recurrence risk, and patient utility values.
• No treatment was preferred when the annual risk of recurrent stroke was below 0.12. PFO closure was favored only when recurrence risk exceeded 0.12 and closure effectiveness was less than 0.28.
• PFO closure was inferior to anticoagulation or antiplatelet therapy when closure effectiveness exceeded 0.6.

Conclusions:

• Significant uncertainties exist regarding the optimal management of stroke in PFO patients, leading to controversy.
• Utilizing novel therapies like PFO closure outside of clinical trials does not resolve uncertainties about their efficacy.