Middle back pain: Back pain in the middle back area. See detailed information below for a list of 31 causes of Middle back pain, Symptom Checker, Assessment Questionnaire, including diseases and drug side effect causes. Â» Review Causes of Middle back pain: Causes | Symptom Checker Â» | Assessment Questionnaire Â» Causes of Middle back pain:
Valvular Heart Disease. Disorders of certain heart valves can also lead to left atrial enlargement. The mitral valve separates the left atrium from the left ventricle. If the mitral valve becomes narrow -- a condition known as mitral stenosis -- blood accumulates in the left atrium and causes enlargement.
It is feasible the AF caused the left atrial enlargement. Alternately the left atrial enlargement might have caused the AF. There the circle starts. The trick is to find out which came first, because the left atrial enlargement might be caused by something else. I'm not sure how they can tell about the left atrial enlargement from an ecg, until the echo.