What is the Role of Out-of-Office BP Measurement in Hypertensive Pregnancy?

Peripartum management of hypertension: a position paper of the ESC Council on Hypertension and the European Society of Hypertension

Hypertensive disorders are the most common medical complications in the peripartum period associated with a substantial increase in morbidity and mortality. Hypertension in the peripartum period may be due to the continuation of pre-existing or gestational hypertension, de novo development of pre-eclampsia or it may be also induced by some drugs used for analgesia or suppression of postpartum haemorrhage. Women with severe hypertension and hypertensive emergencies are at high risk of life-threatening complications, therefore, despite the lack of evidence-based data, based on expert opinion, antihypertensive treatment is recommended. Labetalol intravenously and methyldopa orally are then the two most frequently used drugs. Short-acting oral nifedipine is suggested to be used only if other drugs or iv access are not available. Induction of labour is associated with improved maternal outcome and should be advised for women with gestational hypertension or mild pre-eclampsia at 37 weeks' gestation. This position paper provides the first interdisciplinary approach to the management of hypertension in the peripartum period based on the best available evidence and expert consensus.

[Ambulatory and Home Blood Pressure Measurement in Hypertensive Pregnant Women]

The prevalence of hypertensive disorders in pregnancy (HDP) is 6-8%. Blood pressure measurement (BPM) remains the cornerstone of diagnosis and should be performed in a standardised manner using automated devices. Office BPM represents only a spotty reading in an "artificial" environment failing to diagnose white coat hypertension (WCH). Ambulatory and home blood pressure measurement (ABPM/HBPM) are recommended for the diagnosis and differentiation of hypertension as well as for blood pressure and therapy control in women with HDP. Patient compliance is crucial for the use of both methods. ABPM is an appropriate method for the early identification of WCH and masked hypertension as well as for differentiating WCH from chronic hypertension < 20 week's gestation. HBPM has been shown to reduce the number of antenatal visits and hospital admissions compared to office blood pressure measurement without compromising maternal and fetal outcomes; it also avoids unnecessary antihypertensive medications and reduces the rate of labour inductions and false diagnosis of "preeclampsia". Problems associated with ABPM are its limited availability and inconvenience to patients due to sleep disturbances. Disadvantages of HBPM are the need for patient training, potential measurement errors, and the lack of evidence-based BP thresholds. The widespread use especially of HBPM may contribute to a reduction in workload of obstetric staff in the hospital and may save hospital expense.

Blood pressure profile in pregnancy: The impact of its duration on results and patients' well-being

BACKGROUND

A blood pressure profile (BPP) is often used to diagnose and manage hypertension in pregnancy. However, there is no consensus on the number and interval of blood pressure (BP) readings required.

AIMS

To ascertain whether BP readings at 15-min interval over one hour yields clinically equivalent results to readings at 60-min interval over three hours.

MATERIALS AND METHODS

Eighty unique women were recruited to this prospective study. Automated BP machines were used to take readings at 15-min interval over one hour and at 60-min interval over three hours. The mean systolic and diastolic BPs obtained using each regimen were calculated and compared. Women also completed a questionnaire to evaluate the psychosocial and financial impact of a prolonged outpatient investigation.

RESULTS

BP readings from 67 patients were included for analysis. Clinical equivalence was assessed using the British Hypertension Society (BHS) validation criteria for comparing nonmercury devices to the gold-standard calibrated mercury device. Mean SBP readings for 54% (36/67), 90% (60/67) and 97% (65/67) and mean DBP readings for 73% (49/67), 94% (63/67) and 100% (67/67) were within 5, 10 and 15 mmHg agreement across the two time regimens which achieved grade B and grade A validation, respectively. A BPP was costly and stressful for women and affected their ability to attend work and look after other children.

CONCLUSIONS

A BPP performed over one hour compared to over three hours yields clinically equivalent results, yet has psychosocial and financial advantages.

SOMANZ guidelines for the management of hypertensive disorders of pregnancy 2014

This guideline is an evidence based, practical clinical approach to the management of Hypertensive Disorders of Pregnancy. Since the previous SOMANZ guideline published in 2008, there has been significant international progress towards harmonisation of definitions in relation to both the diagnosis and management of preeclampsia and gestational hypertension. This reflects increasing knowledge of the pathophysiology of these conditions, as well as their clinical manifestations. In addition, the guideline includes the management of chronic hypertension in pregnancy, an approach to screening, advice regarding prevention of hypertensive disorders of pregnancy, and discussion of recurrence risks and long term risk to maternal health. The literature reviewed included the previous SOMANZ Hypertensive Disorders of Pregnancy guideline from 2008 and its reference list, plus all other published National and International Guidelines on this subject. Medline, Cochrane Database of Systematic Reviews (CDSR), Cochrane Central Registry of Controlled Trials (CCRCT), National Institute for Health and Care Excellence (NICE) Evidence Search, and Database of Abstracts and Reviews of Effects (DARE) were searched for literature published between January 2007 and March, 2014.

Diagnosis, evaluation, and management of the hypertensive disorders of pregnancy

OBJECTIVE

This guideline summarizes the quality of the evidence to date and provides a reasonable approach to the diagnosis, evaluation and treatment of the hypertensive disorders of pregnancy (HDP).

EVIDENCE

The literature reviewed included the previous Society of Obstetricians and Gynaecologists of Canada (SOGC) HDP guidelines from 2008 and their reference lists, and an update from 2006. Medline, Cochrane Database of Systematic Reviews (CDSR), Cochrane Central Registry of Controlled Trials (CCRCT) and Database of Abstracts and Reviews of Effects (DARE) were searched for literature published between January 2006 and March 2012. Articles were restricted to those published in French or English. Recommendations were evaluated using the criteria of the Canadian Task Force on Preventive Health Care and GRADE.