- Down sloping 
-concave
- ST segment; Find a Lead w/ no S wave to identify the pattern; Digitalis Toxicity: --r/o Hypokalemia; 
- Arrhythmia: 
- PVC, Bigeminy, Trigeminy, 
- Ventricular Tach w/ AV dissociation 
- Ventricular Fibrillation 
- Atrial Fibrillation, 
- PAT w/block 
- Nodal Rhytms 
- Sinus Bradycardia 
- Conduction abnormalities: 
- SA block, 1^, 2^, 3^ AV heart block 
- quinidine 
- Procainamide: 
- Prolonged QT ?, flattened T waves, and QRS widening