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Hypertensive disorders arising in pregnancy

Data Item category

Maternal Morbidity - gestational

Collections containing the item

Data definitions

METeOR: The type of hypertensive disorder during pregnancy which a female has been diagnosed with, as represented by a code. Eclampsia - Eclampsia is characterised by grand mal seizures, hypertension, proteinuria, oedema and may progress to coma. Before a seizure, a patient may experience a body temperature of over 40°C, anxiety, epigastric pain, severe headache and blurred vision. Complications of eclampsia may include cerebral haemorrhage, pulmonary oedema, renal failure, abruptio placentae and temporary blindness (National Centre for Classification in Health, 2010). Preeclampsia - Preeclampsia is a multi-system disorder unique to human pregnancy characterised by hypertension and involvement of one or more other organ systems and/or the fetus. Proteinuria is the most commonly recognised additional feature after hypertension but should not be considered mandatory to make the clinical diagnosis.
A diagnosis of preeclampsia can be made when hypertension arises after 20 weeks gestation and is accompanied by one or more of the following: Renal involvement, Haematological involvement, Liver involvement, Neurological involvement, Pulmonary oedema, Fetal growth restriction, Placental abruption.
Women with HELLP syndrome (which stands for Haemolysis, Elevated Liver Enzymes, Low Platelet count and is a variant of preeclampsia) are to be included under this code for preeclampsia. Gestational hypertension - Gestational hypertension is characterised by the new onset of hypertension after 20 weeks gestation without any maternal or fetal features of preeclampsia, followed by return of blood pressure to normal within 3 months post-partum. NPDC: Same definitions as METeOR.
SA PDC: BP greater than or equal to 140/90 on 2 occasions at least 4 hrs apart, or greater than or equal to 170/110 on 1 occasion; ± Proteinuria; ± generalised oedema; WA PDC: commenced collection of gestational hypertension and pre-eclampsia superimposed on essential hypertension in July 2014. WA PDC also collects pre-eclampsia: "A rise in the systolic BP to 140mm Hg or more and /or a rise in the diastolic BP to 90mm Hg or more in a woman who has been normotensive before the 24th week of pregnancy, with or without proteinuria; TAS PDC: The same definitions as METeOR. ANZNN: Hypertension in pregnancy is defined as: a systolic blood pressure greater than or equal to 140 mmHg and / or a diastolic blood pressure greater than or equal to 90 mmHg or a rise in systolic blood pressure greater than or equal to 25 mmHg and/or a rise in diastolic blood pressure greater than or equal to 15 mmHg from blood pressure reading before conception or in the first trimester (confirmed by two readings six hours apart).
METeOR: 1 = Eclampsia; 2= Preeclampsia; 3 = Gestational hypertension; 4 = Chronic hypertension; 9 = Not stated/ inadequately described.
NSW PDC: Gestational Hypertension is hypertension developing after 20 weeks gestation without proteinuria. Preeclampsia is hypertension developing after 20 weeks gestation with proteinuria. Pregnancy-induced hypertension (proteinuric) includes pre-eclampsia and eclampsia. VIC PDC: Pre-eclampsia is a serious disorder that carries a severe morbidity and mortality risk for both mother and child. About one in ten pregnancies is complicated by hypertension: about 3-4 per cent have pre-eclampsia, a similar proportion have gestational hypertension and 1-2 per cent have pre-existing chronic hypertension. (MJA 2003; 179 (4): 182-184). QLD PDC: Hypertension specifically occurring during pregnancy. Multiple hypertension types may be selected (ICD-10-AM code). Indicate whether the hypertension is: Gestational (mild), Pre-eclampsia (moderate), Pre-eclampsia (severe), HELLP. TAS PDC: Pregnancy induced hypertension; Pre-eclampsia; Eclampsia. ACT PMC: Was hypertension present - not stated, none, chronic hypertension - essential, chronic hypertension - renal disease, pregnancy induced, chronic superimposed PIH.

Additional information

All S/T Perinatal Data Collections include data on hypertension in pregnancy, however, there is variation in the definitions and scope of the data. NPDC includes indicator for hypertensive disorder during pregnancy - An indicator of whether a female has a hypertensive disorder during pregnancy, based on a current or previous diagnosis, as represented by a code: 1 = Yes; 2 = No; 9 = Not stated.

Related items

Pre-existing hypertension

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