Myocardial Infarction (MI)

Etiology

  • Type 1: Plaque rupture event with coronary occlusion (common cause of STEMI)
  • Type 2: Supply demand mismatch, where physiologic stress (e.g. sepsis, tachycardia, anemia, hypoxemia, etc) causes increased myocardial O2 demand that can't be met; can be superimposed on pre-existing CAD
  • Type 3: Sudden cardiac death related to MI
  • Type 4: MI during percutaneous procedure
  • Type 5: MI during by-pass surgery

Risk Factors

  • Dm
  • Htn
  • Smoking
  • Age > ~50
  • Hyplerlpidemia
  • Family hx
  • Known atherosclerosis

Symptoms

  • Acute chest pressure @ rest, can radiate to arm/neck back
  • Pressure pain can sometimes present in epigastric area/upper abdomen
  • Often assoc n, v, sob, diaphoresis, feeling poorly
  • Hx known cad or vascular RFs

Physical Exam Findings

  • Sometimes tachycardia, htn, diaphoresis, uncomfortable appearance
  • Can have elevated jvp, rales, other CHF findings

Sub-Diseases