From: Cardiac cephalalgia: a case series of four patients and updated literature review
A. Any headache fulfilling criterion C |
B. Acute myocardial ischemia has been demonstrated |
C. Evidence of causation demonstrated by at least two of the following: |
 1. headache has developed in temporal relation to the onset of acute myocardial ischemia |
 2. either or both of the following: |
  a) headache has significantly worsened in parallel with worsening of the myocardial ischemia |
  b) headache has significantly improved or resolved in parallel with improvement in or resolution of the myocardial ischemia |
 3. headache has at least two of the following four characteristics: |
  a) moderate to severe intensity |
  b) accompanied by nausea |
  c) not accompanied by phototophia or phonophobia |
  d) aggravated by exertion |
 4. headache is relieved by nitroglycerine or derivatives of it |
D. Not better accounted for by another ICHD-3 diagnosis |