This means an ECG showing atrial fibrillation will have no visible P waves and an irregularly irregular QRS complex. The ventricular rate is frequently fast, unless the patient is on AV nodal ...
If no P waves can be seen and the QRS complexes are irregularly irregular, then atrial fibrillation is present. ST segment elevation from pericarditis is diffuse (all leads except aVR and V1 ...
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