P Pulmonary (OSA, PE, COPD, Pneumonia)
I Ischemia, Infarct , Infections, Iatrogenic (surgery/hospital stress)
R Rheumatic Disease, Mitral Regurgitation
A Alcohol, Anemia
T Toxins (stimulants), Thyrotoxicosis
E Electrolytes, Endocarditis, Essential Hypertension
S Sepsis, Sick Sinus Syndrome
