Which of the following is the best inotrope agent for use in Right Hea Failure secondary to pulmonary hypeension?

Phosphodiesterase III inhibitors (Milrinone) acts a non-beta receptor pathway to effect a decrease in pulmonary vascular resistance while improving left and right contractility. Such interventions are the treatment of choice in conditions of Right Hea Failure secondary to high pulmonary vascular resistance (pulmonary hypeension). Ref: Review of Clinical Anesthesia By Neil Roy Connelly, Page 218.