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Patent Foramen Ovale

Patent Foramen Ovale: Risk Factors, Diagnosis, Treatments, Post-surgery care | National Heart Centre Singapore

Patent Foramen Ovale - Symptoms

Patent Foramen Ovale - How to prevent?

Patent Foramen Ovale - Causes and Risk Factors

Risk Factors

The procedure usually takes between one to two hours and the success rate is about 95%. However, there are known risks involved. The risks and their estimated incidence of occurrence are: 

  • Device dislodgement (embolization) and the need for emergency heart surgery – <1%
  • Device erosions (device erodes through the heart walls) – 0.3%
  • Death – <1% (usually from perforation of the heart chamber).
  • Dislodgement of clot or air bubbles to the brain (causing stroke) and other organs – 1%
  • Rhythm disturbance (arrhythmia) are usually transient – 1-2%
  • Other potential risks – Allergic dye reaction, anaesthetic reaction, bleeding and bruising around the sheaths in the groin, injury to the artery/vein/nerves in the groin, perforation of the oesophagus (from the Transoesophageal Echocardiography (TEE) probe), headache or migraine and infection, allergic reaction to the nickel component of the device 


Some of these complications, if they occur, are of a serious nature and may require further treatment including surgery and prolonged hospitalisation. In the event of device dislodgement, you may require surgery for removal of the device and closure of the PFO at the same time. 

The information provided is not intended as medical advice. Terms of use. Information provided by SingHealth

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