Angina.  A primer on what can happen if a heart is in need of blood.
D000787:Angina Pectoris / Q000175:diagnosis / Q000188:drug therapy / Q000503:physiopathology*; D006801:Humans; D017202:Myocardial Ischemia / Q000503:physiopathology*; D009206:Myocardium; D005996:Nitroglycerin / Q000627:therapeutic use; D014665:Vasodilator Agents / Q000627:therapeutic use
D014665:Vasodilator Agents; D005996:Nitroglycerin