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Pre-existing Hypertension

Data Item category

Maternal Morbidity - pre-existing

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. NPDC: Type of hypertensive disorder during pregnancy: Chronic or gestational hypertension. WA PDC: Essential hypertension is a diastolic blood pressure of 90 mmHg or more recorded on at least two occasions before 24 weeks of pregnancy and not due to any identifiable aetiology factor.
METeOR: 1 = 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)); 2 = 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); 3 = 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) 4 = Chronic hypertension (This may include essential or secondary hypertension. Essential hypertension is defined by a blood pressure > 140 mmHg systolic and/or > 90mm diastolic confirmed before pregnancy or before 20 completed weeks gestation without a known cause. It may also be diagnosed in women presenting early in pregnancy taking antihypertensive medications where no secondary cause for hypertension has been determined. Important secondary causes of chronic hypertension in pregnancy include:Chronic kidney disease, e.g. glomerulonephritis, reflux nephropathy, and adult polycystic kidney disease; Renal artery stenosis; Systemic disease with renal involvement, e.g. diabetes mellitus, systemic lupus erythematosus; Endocrine disorders, e.g. phaeochromocytoma, Cushing syndrome and primary hyperaldosteronism; Coarctation of the aorta.); 9 = Not stated/inadequately described.
NPDC: None; Gestational hypertension; Chronic hypertension; Not stated.
QLD PDC: No definition for hypertension but general description for current medical conditions: Includes pre-existing maternal conditions, hypertension or diabetes, and other diseases, illnesses or conditions arising during the current pregnancy, that are not directly attributable to pregnancy but may significantly affect care during the current pregnancy and/or pregnancy outcome. NSW PDC: Chronic hypertension: hypertension diagnosed prior to, or in the first half, of the current pregnancy. VIC PDC: Pre-existing hypertension: maternal diseases and conditions that are not directly attributable to pregnancy but may significantly affect care during the current pregnancy and or pregnancy outcome. SA PDC: Hypertension that is pre-existing. TAS PDC: Same definition as METeOR for Chronic hypertension.

Additional information

VIC, SA, TAS and NT collect "hypertension". QLD, WA and ACT collect "essential hypertension". NSW and SA collect "chronic hypertension". NSW PMC collects data on different types of hypertension - essential, secondary, unspecified, gestational, pre-eclampsia, chronic and superimposed pre-eclampsia, unspecified. There is an indicator item in the NPDC 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: Yes; No; Not stated).

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