... Chapter 013. Chest Discomfort (Part 3) Unstable Angina and Myocardial Infarction (See also Chaps. 238 and 239) ... cardiac tamponade tend to result in mild or no chest pain. The adjacent parietal pleura receives its sensory supply from several sources, so the pain of pericarditis can be experienced in areas ... back. Most typically, the pain is retrosternal and is aggravated by coughing, deep breaths, or changes in position—all of which lead to movements of pleural surfaces. The pain is often worse in...