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:
Other medical conditions are less frequent causes of left atrial enlargement. For example, a ventricular septal defect -- a hole in the wall that separates the right and left ventricles -- can alter blood flow through the heart such that there is overfilling and enlargement of the left atrium.
Tricuspid insufficiency (TI) , a valvular heart disease also called tricuspid regurgitation (TR), refers to the failure of the heart's tricuspid valve to close properly during systole.eft ventricular failure is, in turn, the most common cause of right ventricular dilation. Other common causes of right ventricular dilation include right ventricular infarction, inferior myocardial infarction and cor pulmonale. Other diseases can directly affect the tricuspid valve.