RecruitingPhase 1Drug trialMechanisms of Diuretic Resistance in Heart Failure, Aim 2Randomized placebo-controlled, double-blind, double-dummy, crossover design testing combinations placebo/placebo, bendroflumethiazide/placebo, amiloride/placebo, and bendroflumethiazide/amiloride added to bumetanide.