"In addition, the sympathetic dystrophy can cause the complication of intractable hypertension which responds best to alpha I blockers (Dibenzyline, Hytrin, or Clonodine). The RSD can cause attacks of irregular or fast heart beat, chest pain, coronary artery spasm (angina), as well as disturbance of function of other internal organs. A few examples are frequency and urgency of urination, respiratory disturbance such as dyspnea and apneic attacks, and attacks of severe abdominal pain." by Dr. Hooshmand puzzle no. 34