Inclusive criteria
Hypertensive Disorder, labor
HEART
①All participants were diagnosed Hypertensive Disorder Complicating Pregnancy according to the diagnostic criteria;②All parturients were classified to grade II or III according to American Society of Anesthesiologists standard;③New York Heart Association Cardiac Function Grade I;④According to the diagnosis of obstetricians, vaginal trial labor is feasible and labor analgesia is voluntary;⑤No history of cesarean section;⑥No contraindication of intraspinal anesthesia, platelet > 100 × 10