22 patients had plasma-digoxin levels between 0.8 and 2.0 ng/ml before withdrawal -- of these , 7 deteriorated without digoxin ( 5 had atrial fibrillation , which was associated with congestive heart-failure , measurement of the pre-injection period/left-ventricular ejection time ( p.e.p./l.v.e.t . ) ratio suggested that digoxin did exert a sustained positive inotropic effect .
C0004238
atrial fibrillation
C0012265
digoxin