My potassium levels were 5.2 at last blood tests. is this dangerous on flecainide for af. my cardiologist dismisses my fears?

Potassium level: This is a minor elevation of your potassium. By itself it is unlikely to cause any problems. You so not mention any need for potassium supplement so I assume you are not taking these. It does not cause a danger for your use of Flecainide. If you are concerned continue to follow your potassium level. Sometimes there are reasons why it is high and it is not a true reading.