Dilated cardiomyopathy
Hypertrophic cardiomyopathy
Restrictive cardiomyopathy
Peripartum cardiomyopathy
Takotsubo cardiomyopathy<unk> 
Cardiovascular-mediated syncope
Dysrhythmias:
WPW (pre-excitation)
Long QT Syndrome/QT prolongation
Brugada Syndrome
Catecholaminergic polymorphic<unk>  tachycardia
2nd/3rd AV Block
Afib/aflutter
Vtach/torsades
Sick sinus syndrome<unk> 
Short QT syndrome
Cardiovascular disease
Valvular Disease (AS, MS, tricuspid stenosis)
Aortic Dissection
Myocardial Infarction
CHF
Hypertrophic Cardiomyopathy
PE
Pericardial Tamponade
Myxoma
Pulmonary Hypertension
Pacemaker malfunction
Neurally mediated syncope
Vasovagal:
Fear, pain, emotion, valsalva, breath-holding spell
Situational (associated with):
Coughing, micturition, defecation, vomiting, swallowing, postexercise
Carotid sinus stimulation
Orthostatic hypotension-mediated syncope:
Volume depletion:
Dehydration (vomiting, diarrhea)
Hemorrhage, (Ectopic Pregnancy, Upper GI Bleed/Lower GI Bleeding, Abdominal Aortic Aneurysm)
Sepsis
Autonomic Dysreflexia
Autonomic failure due to meds
Other serious causes
Stroke
SAH
TIA
Vertebrobasilar Insufficiency
Subclavian steal
Heat syncope
Hypoglycemia
Hyperventilation
Asphyxiation
Seizure
Narcolepsy
Psychogenic (anxiety, conversion disorder, somatic symptom disorder)
Toxic (drugs, carbon monoxide, etc.)
Dysrhythmias:
WPW (pre-excitation)
Long QT Syndrome/QT prolongation
Brugada Syndrome
Catecholaminergic polymorphic<unk>  tachycardia
2nd/3rd AV Block
Afib/aflutter
Vtach/torsades
Sick sinus syndrome<unk> 
Short QT syndrome
Cardiovascular disease
Valvular Disease (AS, MS, tricuspid stenosis)
Aortic Dissection
Myocardial Infarction
CHF
Hypertrophic Cardiomyopathy
PE
Pericardial Tamponade
Myxoma
Pulmonary Hypertension
Pacemaker malfunction
WPW (pre-excitation)
Long QT Syndrome/QT prolongation
Brugada Syndrome
Catecholaminergic polymorphic<unk>  tachycardia
2nd/3rd AV Block
Afib/aflutter
Vtach/torsades
Sick sinus syndrome<unk> 
Short QT syndrome
Valvular Disease (AS, MS, tricuspid stenosis)
Aortic Dissection
Myocardial Infarction
CHF
Hypertrophic Cardiomyopathy
PE
Pericardial Tamponade
Myxoma
Pulmonary Hypertension
Pacemaker malfunction
Vasovagal:
Fear, pain, emotion, valsalva, breath-holding spell
Situational (associated with):
Coughing, micturition, defecation, vomiting, swallowing, postexercise
Carotid sinus stimulation
Fear, pain, emotion, valsalva, breath-holding spell
Coughing, micturition, defecation, vomiting, swallowing, postexercise
Carotid sinus stimulation
Volume depletion:
Dehydration (vomiting, diarrhea)
Hemorrhage, (Ectopic Pregnancy, Upper GI Bleed/Lower GI Bleeding, Abdominal Aortic Aneurysm)
Sepsis
Autonomic Dysreflexia
Autonomic failure due to meds
Dehydration (vomiting, diarrhea)
Hemorrhage, (Ectopic Pregnancy, Upper GI Bleed/Lower GI Bleeding, Abdominal Aortic Aneurysm)
Sepsis
Stroke
SAH
TIA
Vertebrobasilar Insufficiency
Subclavian steal
Heat syncope
Hypoglycemia
Hyperventilation
Asphyxiation
Seizure
Narcolepsy
Psychogenic (anxiety, conversion disorder, somatic symptom disorder)
Toxic (drugs, carbon monoxide, etc.)
Normal in pediatrics
Myocardial infarct (NSTEMI)
Myocardial ischemia (Wellen's) - T waves go up, then down
Hypokalemia - T waves go down, then up (or camel humped, one upright TW and upright U-wave in severe hypokalemia)
Hyperkalemia
Pulmonary embolism (RV strain)
Pulmonary hypertension, acute or chronic
Pulmonary disease - hyperventilation, pneumothorax, pneumonia
LVH with strain pattern
RVH
Bundle branch block (both left and<unk> 
WPW
Pericarditis (stage 3)
CNS T waves (diffuse, deep)<unk>  (may also have epsilon wave)
HOCM
Paced rhythm
Elevated intracranial pressure
Arrhythmogenic right ventricular dysplasia
Dilated cardiomyopathy
Stone heart
Hypertrophic cardiomyopathy
Hypoplastic left heart syndrome
Restrictive cardiomyopathy
Peripartum cardiomyopathy
Total anomalous pulmonary venous return