[Study on diagnostic criterion of pregnancy induced hypertension]

To study the rationality of the current diagnostic criterion of pregnancy induced hypertension (PIH) in mainland China.

To analytically review the 916 cases of PIH in our hospital, reclassify them using both the current domestic diagnostic criteria and the William Obstetrics' criteria, then compare and analyze perinatal and maternal outcomes from the two standards.

(1) Maternal outcomes: comparison result of the occurrences among three groups of premature birth, postpartum haemorrhage and placental abruption according to domestic classification had significant difference (P < 0.05). And it's the same result according to foreign classification (P < 0.05). But the occurrences within three groups of premature birth, postpartum haemorrhage and placental abruption between domestic and foreign classifications showed no significant difference (P > 0.05). (2) Perinatal outcomes: Comparison results of the occurrences among three groups of fetal growth restriction, asphyxia neonatorum and perinatal fetal and neonatal death incidence according to domestic classification had significant difference (P < 0.05). And it's the same result according to foreign classification (P < 0.05). But the occurrences within three groups of fetal growth restriction, asphyxia neonatorum and perinatal fetal death and neonatal incidence showed no significant difference (P > 0.05). (3) The constituent ratio of mild, moderate, severe PIH according to domestic classifications was 46.6%, 18.4%, 34.9% respectively. The constituent ratio of gestationgal hypertision, mild preeclampsia and severe preeclampsia according to foreign classifications was 47.6%, 14.3%, 38.1%. There were significant differences between domestic and foreign constituent ratio (P < 0.05). If you compare the results from these two diagnostic classifications, with mild PIH, the accordant rate was 85.0%; with severe PIH, the rate was 93.8%; but it's only 40.2% with moderate PIH.

The diagnostic criteria for PIH being used in our mainland China is rational, but in the current stage, due to the lack of objective index for early diagnosis and overall assessment of patient's condition, it's also limited. More objective index should be adopted to improve the diagnostic standard for PIH.