<prompt> All are used for the treatment of pulmonary hypeension EXCEPT:Endothelin receptor antagonistsPhosphodiesterase inhibitorsCalcium channel blockersBeta blockers  <response>: CCBs, ET antagonists are used in Pul.HTN apa from PGI2 analogues and PDE5 inhibitors No- nitric oxide - only therapeutic use is Pul. HTN in newborn betablockers- no role Ref: KD tripathi 8th ed. 