Findings on ECG that may be seen in patients with patent foramen ovale include:  
Crochetage pattern: An M-shaped bifid notch on the ascending branch, or on the zenith, of the R wave in inferior ECG leads (II, III, aVF). Right bundle branch block (RBBB) P wave abnormalities
"What is an electrocardiogram for patent foramen ovale?"
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: "What is an electrocardiogram for patent foramen ovale?" [/INST] \n Findings on ECG that may be seen in patients with patent foramen ovale include:  
Crochetage pattern: An M-shaped bifid notch on the ascending branch, or on the zenith, of the R wave in inferior ECG leads (II, III, aVF). Right bundle branch block (RBBB) P wave abnormalities</s>