<prompt> Absent P Wave is seen in:Atrial FibrillationCor-pulmonaleMitral StenosisCOPD  <response>: Answer is A Atrial Fibrillation P wave is typically absent in Atrial Fibrillation. COPD and Cor-Pulmonale are associated with tall p waves from Right Atrial Enlargement P-Pulmonale while Mitral Stenosis is typically associated with a wide and notched p wave from Left Atrial Enlargement P-Mitrale Causes of Absent Wave: Atrial fibrillation p wave is absent or replaced by fibrillary T wave Atrial flutter p wave is replaced by flutter wave, which shows saw-tooth appearance. SA block or sinus arrest Nodal rhythm usually abnormal, small p wave. Ventricular ectopic and ventricular tachycardia. Supraventricular tachycardia p wave is hidden within QRS, due to tachycardia. Hyperkalemia. Idioventricular rhythm Right Atrial EnlargementRAE is typically associated with tall P waves P Pulmonale COPD and Cor-Pulmonale are associated with tall p waves from RAE Left Atrial enlargementLAE is typically associated with wide P waves P Mitrale Mitral Stenosis is typically associated with a wide and notched p wave from LAE 