Then responses of PARs to acetylcholine (ACh),phenylephrine (PE) and Ca 2+ ionopore A23187 were measured in vitro.

• 用离体血管环技术观察肺动脉对乙酰胆碱（ACh）、Ca2＋载体A23187和苯肾上腺素（PE）的反应性变化。