Editing Threshold potential (section)

====Role of diet====
Diet may be a variable in the risk of arrhythmia. [[Polyunsaturated fatty acids]], found in fish oils and several plant oils,<ref>{{cite web|title=Polyunsaturated Fat|url=https://healthyforgood.heart.org/eat-smart/articles/polyunsaturated-fats|website=American Heart Association|access-date=22 May 2018}}</ref> serve a role in the prevention of arrhythmias.{{sfn|Savelieva|Kourliouros|Camm|2010|p=213}} By inhibiting the voltage-dependent sodium current, these oils shift the threshold potential to a more positive value; therefore, an action potential requires increased depolarization.{{sfn|Savelieva|Kourliouros|Camm|2010|p=213}} Clinically therapeutic use of these extracts remains a subject of research, but a strong correlation is established between regular consumption of fish oil and lower frequency of hospitalization for atrial fibrillation, a severe and increasingly common arrhythmia.{{sfn|Savelieva|Kourliouros|Camm|2010|pp=213–215}}