Hypertension and haemodynamics in pregnant women--is a unified theory for pre-eclampsia possible?

Percutaneous Coronary Intervention in Pregnancy: A Contemporary Review

Percutaneous coronary intervention (PCI) during pregnancy presents unique challenges due to physiological cardiovascular adaptations and concerns regarding maternal and fetal safety. This comprehensive review examines the current understanding of PCI in pregnancy, including pathophysiology, indications, technical considerations, outcomes, and management approaches. Despite being rare, cardiovascular disease remains the leading cause of maternal mortality in developed countries, with acute coronary syndrome increasing in frequency among pregnant women. The management of acute coronary syndrome in pregnancy requires a multidisciplinary approach focusing on maternal safety while minimizing fetal risks. Current evidence supports the use of PCI as the preferred revascularization strategy for appropriate indications during pregnancy, with specific procedural modifications to minimize radiation exposure and optimize medication selection. This review synthesizes contemporary literature to provide evidence-based recommendations for the management of pregnant patients requiring coronary intervention.

Perioperative Management of Patients with Preeclampsia: A Comprehensive Review

Preeclampsia is a common condition of pregnancy characterized by hypertension complicated by cerebral, cardiac, hepatic, renal, hematologic, and placental dysfunction. Patients with preeclampsia frequently undergo cesarean delivery, the most common major surgical procedure in the world. They represent a high-risk perioperative cohort suffering significant preventable morbidity and mortality. This review focuses on the anesthesiologist's role, through a perioperative lens, in reducing maternal complications through management of hypertension and strategies for preserving the function of the brain, heart, liver, kidney, hematologic and coagulation systems, and placenta in patients with preeclampsia undergoing cesarean delivery. Preeclampsia-specific resuscitation, individualized fluid administration, safe neuraxial and general anesthesia, and management of intraoperative bleeding are discussed along with strategies for postoperative analgesia, thromboprophylaxis, and antihypertensive agents in patients who breastfeed. This review discusses recently recognized postoperative deterioration in maternal mental health, the possibility of myocardial injury after cesarean delivery, and the need for long-term cardiometabolic follow-up.

Pregnancy reference intervals and exertion and breathlessness ratings for the six minute walk test in healthy nulliparous people

Background

The Six Minute Walk Test (6MWT) is a simple, non-invasive, well-validated test that assesses cardiorespiratory fitness however is rarely used in pregnant people. It may have clinical utilization to assess fitness, breathing and exertion in pregnancy however no reference intervals exist for people 14+0 to 35+6 weeks gestation. We determined the reference intervals for distance walked for the 6MWT, including exertional and breathlessness ratings for this group.

Method

We conducted a prospective observational cohort study of 196 healthy nulliparous pregnant people in earlier pregnancy (EP) 14+0 to 23+6 weeks, and middle pregnancy (MP) 24+0 to 35+6 gestation, who performed a standardized 6MWT protocol including rating exertion and breathlessness (Rating Perceived Exertion (RPE) scale (1 none -15 maximal) and Modified Borg Dyspnea (MBD) scale (0 none - 10 maximal)).

Results

The mean ± SD distance walked was 548 ± 80.9 (EP) versus 547 ± 87.3 (MP) meters (m) P = 0.928. 6MWT reference intervals for the distance walked for the 6MWT were 392-704 m (EP) and 376-718 m (MP). Median (IQR) exertion and breathlessness ratings with exercise for the EP and MP group were 6 (4,7) and 0.5 (0,1) and 6 (4,8) and 0.5 (0,1) respectively. There were no adverse events.

Conclusion

The 6MWT is safe, feasible and acceptable in pregnant people. The reference intervals for the 6MWT are 392-704 m in people 14+0 to 23+6 weeks gestation and 376-718 m for people 24+0 to 35+6 weeks gestation. Exertion was light and breathlessness was just noticeable with the 6MWT.

The prone position in healthy pregnant women and in women with preeclampsia - a pilot study

BACKGROUND

The prone position is rarely used in medical settings in pregnancy. There is no published information about the prone position in women with preeclampsia. This study examined the feasibility and acceptability of the prone position in pregnant women, and the short-term effect of the prone position on blood pressure (BP) in term healthy pregnant women and in women with preeclampsia.

METHODS

After ethics approval, written consent and trial registration (ACTRN:12615000160538 registered 18/02/2015, date of first participant enrolled 03/03/2015), 50 healthy term pregnant women and 15 women with preeclampsia had BP, heart rate (HR), oxygen saturation (SpO2), respiratory rate (RR), fetal heart rate (FHR) and comfort levels measured in two positions: left lateral, and prone. Measurements were after five minutes rest in each position.

RESULTS

Mean ± SD age, gestation and body mass index for healthy pregnant women was 33 ± 4.1 years, 38 ± 1.0 weeks and 27 ± 3.2 kg.m^- 2 and for women with preeclampsia was 32 ± 4.7 years, 36 ± 3.4 weeks, 31 ± 5.6 kg.m^- 2 respectively. No clinically significant changes occurred in healthy pregnant women in the prone position. Systolic BP was reduced in the prone position in women with preeclampsia (P = 0.019, mean difference - 6.6 mmHg, 95% confidence interval - 11.9 to - 1.3 mmHg). 33% of women with preeclampsia experienced a 10 mmHg or greater reduction in systolic BP in the prone position. 42% of healthy pregnant women and 47% of women with preeclampsia preferred the prone position to lateral.

CONCLUSIONS

This is the first study to examine the prone position in women with preeclampsia. For short periods of time the prone position is feasible and comfortable in pregnant women including those at term. The prone position may reduce systolic BP in women with preeclampsia without obvious adverse effects. Larger studies with women lying for longer periods in the prone position are required. Pregnancy should not be a contraindication to the prone position for short periods of time.

TRIAL REGISTRATION

ACTRN:12615000160538.

Doppler Assessment of Uterine Blood Flow in Pre-eclampsia: A Review

Doppler ultrasonography plays an ever-increasing role in obstetric imaging. Although commonly purported to assess blood flow, most studies in this area report purely on velocimetric parameters, rather than true volumetric flow. This review article highlights the physiological importance of this distinction, and reports on a literature review of uterine artery Doppler interrogation in the context of pre-eclampsia, which identified only four original research papers that attempted to assess blood flow. Attention is needed for true volumetric flow assessment in pre-eclampsia research, which may permit a more complete conceptualisation of the pathogenesis and haemodynamic consequences of this condition.

Blood pressure assessment and first-line pharmacological agents in women with eclampsia

BACKGROUND

Eclampsia is a life-threatening complication of pregnancy. Timely blood pressure assessment and administration of magnesium sulphate are essential management. In this retrospective single-centre study we examined the timing and magnitude of maternal blood pressure before eclampsia, and whether magnesium sulphate was administered as the first agent for treatment.

METHODS

We conducted a five-year review of eclampsia in a tertiary referral obstetric hospital. Using data from electronic birthing records and hospital coding (ICD-10AM) we identified patients with the diagnostic criteria for eclampsia and assessed patient characteristics, blood pressure and pharmacological treatment.

RESULTS

There were 33812 births from July 2008 to June 2013 with 19 cases of eclampsia (1:1780). Patients were 32±5.9years of age, 36±3.9weeks of gestation, 63% were nulliparous and all had a singleton pregnancy. Antepartum eclampsia occurred in 74%. In the four hours before a fit, 47% of patients had blood pressure recorded, of whom 78% were hypertensive. Magnesium sulphate was administered as first therapy in 47% of patients but it was not given to any patient transferred to hospital by ambulance. Of the patients who fitted antenatally, 86% underwent caesarean section, of whom 25% received neuraxial anaesthesia.

CONCLUSIONS

Our study highlights the need for vigilance when managing pregnant women with hypertension, especially in the third trimester as eclampsia is most likely preceded by raised blood pressure. It also highlights the need for timely commencement of magnesium sulphate in the community and during transfer to hospital for the treatment of eclampsia, and for prevention of eclampsia in hospital when thresholds for severe preeclampsia are met.