2 doctors weighed in:

Been to two heart doctors and all test are normal, but still have chest pain, lightheaded, and shortness of breath! is this atrial fibrillation?

2 doctors weighed in
Dr. Christian Mayaud
Internal Medicine - Hospital-based practice
1 doctor agrees

In brief: Maybe ...

Chronic Atrial fibrillation is not likely to be missed on even a routine ECG.
A comprehensive history is not likely to miss it either. However, if your symptoms are episodic and you weren't having the symptoms while you were being tested, it is POSSIBLE that episodic atrial fibrillation or other Paroxysmal Supraventricular Tachycardias (PSVT) could cause those symptoms.

In brief: Maybe ...

Chronic Atrial fibrillation is not likely to be missed on even a routine ECG.
A comprehensive history is not likely to miss it either. However, if your symptoms are episodic and you weren't having the symptoms while you were being tested, it is POSSIBLE that episodic atrial fibrillation or other Paroxysmal Supraventricular Tachycardias (PSVT) could cause those symptoms.
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