Heparin and low molecular weight heparin: Heparin is found in the secretory granules of mast cells. LMWH has more anti factor Xa activity than heparin.
Causes of right bundle branch block / pattern in ECG: ASD, Ebstein's anomaly, normal variant, Injury to right bundle during cath, LV pacing, post op TOF.
Arm lead inversion / technical dextrocardia can be recognized by inverted P waves, negative QRS and T waves in lead I. Chest leads have normal pattern.