The best replacement for pulmonary hypertension is hypertension.

The best alternatives to pulmonary hypertension are rated as following:
★★★★★  hypertension
★★★  pulmonary arterial hypertension
★  pulmonary edema
★  systemic hypertension
★  regular hypertension
  pulmonary artery hypertension
  secondary pulmonary hypertension
  essential hypertension
  pulmonary fibrosis
  primary pulmonary hypertension

Your alternative for pulmonary hypertension is not listed? Suggest!
Speaking about pulmonary hypertension, one probably shouldn't forget about copd.

Other search terms related to pulmonary hypertension and their ratings are:

★★★★★ copd
★★★ scleroderma
★★★ cor pulmonale
★★★ pulmonary embolism
★★ asd
★★ congestive heart failure
★★ normal echo
right heart failure
heart failure
tricuspid regurgitation
pa pressure
pulmonary fibrosis
diastolic dysfunction
mitral regurgitation
You have in mind a companion for pulmonary hypertension and it is not yet here? Propose!

Google Trends

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pulmonary hypertension
pulmonary arterial hypertension