Procedural Characteristics During ablation, 79 percent of patients were in spontaneous atrial fibrillation. Successful pulmonary-vein isolation was attained in 97 percent of most patients, with no significant differences between groups. For the mixed group designated to isolation plus electrograms, complex fractionated electrograms had been successfully eliminated in 80 percent of sufferers; in 11 percent, complex fractionated electrograms weren’t mapped based on the protocol because atrial fibrillation was noninducible after pulmonary-vein isolation; in 9 percent, all complex fractionated electrograms cannot be eliminated.As the guidelines state: ‘consider reducing the patient’s risk for adverse drug reac-tions by determining what should be discontinued before medical procedures or ought to be avoided and dose reducing or substituting possibly inappropriate medications.’ Additionally, the severe nature and quantity of underlying medical problems call for particular strategies by the complete surgical team, regarding to Dr. Ko. ‘Patients who are 90 years old generally have even more comorbidities than those who find themselves 65 years,’ he stated. ‘There may be something wrong with the heart, the lungs, the kidneys, the liver.