There are 22 patients (62.86%) with digoxin levels under 0.5 ng / ml, 8 patients (22.86%) with digoxin levels ranging from 0.5 - 0.8 ng / ml, 3 patients (8.57%) with digoxin levels ranging from 0.8 - 1.2 ng / ml and 2 patients (5.71%) with digoxin levels ranging from 1.2 - 2.0 ng/ml.