Refer to the given electrocardiogram and select the correct statement

Answer: CSolution: In case of complete A-V block (third degree block), the condition in the AV bundle causes complete block of the impulse from the atria into the ventricles. The ventricles spontaneously establish their own signal usually originating in the AV node or AV bundle. Therefore, the P wave become dissociated from QRS-T complexes and there is no relation between the rhythm of the P waves and that of the QRS-T complexes. The rate of rhythm of the atria in this elecrocardiogram is about 100 beats per minute, whereas the rate of ventricular beat is less than 40 per minute.