Critical illness in pregnancy. An analysis of 20 patients admitted to a medical intensive care unit

The Relationship Between Delivery and the PaO2/FiO2 ratio in COVID-19: A Cohort Study

OBJECTIVE

To study the effect of delivery on the pO₂ /FiO₂ ratio (P/F ratio) in patients with COVID-19-related acute respiratory distress syndrome (ARDS) and to compare characteristics between delivered and undelivered pregnant patients with COVID-19.

DESIGN

Retrospective cohort.

SETTING

Four hospitals in Houston, Texas.

POPULATION

Pregnant patients admitted to the hospital for COVID-19.

METHODS

Among patients with ARDS who were delivered during their hospitalization for COVID-19, linear mixed models were used to investigate time trends before and after delivery of the P/F ratio. Patient characteristics were compared between patients delivered during their hospitalization for COVID-19 and those discharged undelivered.

MAIN OUTCOME MEASURES

The P/F ratio, age, gestational age, length of stay, and severity of illness,.

RESULTS

Between May 4, 2020 and July 26, 2020, 61 pregnant patients were admitted for COVID-19. Baseline characteristics were similar between the study groups. Delivery occurred in 21 (34%) of patients during their hospitalization for COIVD-19. Delivered patients had more severe disease and were admitted at a later gestational age than patients not delivered. Ten of these 21 patients (48%) were delivered preterm, and of these, six were delivered due to complications of COVID-19 and four were delivered for obstetric indications. In patients with ARDS who were delivered (n=17), the P/F ratio had a negative slope that improved after delivery.

CONCLUSIONS

COVID-19-related ARDS in pregnancy requires multidisciplinary care and individualized decision-making, but delivery slows the deterioration of the P/F ratio in these patients.

Extracorporeal membrane oxygenation in pregnant and postpartum women: a ten-year case series

Objective

tExtracorporeal membrane oxygenation (ECMO) is a life-saving therapy for severe, reversible cardiopulmonary failure, but data regarding its use in pregnancy and the postpartum period are limited. We sought to quantify survival of pregnant and postpartum women necessitating ECMO in a contemporary cohort at a single tertiary institution.

Study Design

All women of reproductive age (14–44 years), who underwent ECMO at our institution between January 1, 2008, and December 31, 2017, were identified using a query of hospital encounters for ECMO-related CPT codes. We manually reviewed all charts of women of reproductive age; women who were pregnant or <6 weeks postpartum at the time of ECMO initiation were included. Clinical characteristics and maternal and fetal outcomes are described.

Results

In this study, 54 women of reproductive age underwent ECMO for cardiopulmonary failure. Of those, 9 (17%) were pregnant or <6 weeks postpartum at the time of ECMO initiation: 4 antepartum, 1 intraoperative at the time of cesarean delivery, and 4 postpartum (including 2 in whom ECMO was initiated on postpartum day 0 or 1). Overall, maternal survival was 33%. The median maternal age was 24 years (range 19–39 years); most women were nonsmokers without underlying medical comorbidities. The most common indication for ECMO use in pregnant and postpartum women was acute respiratory distress syndrome, which was present in 7 cases (78%), including 5 cases that were due to infectious etiologies and 2 cases that were attributed to preeclampsia. The median number of days on ECMO was 6 (range 1–14). There were no cases of obstetric hemorrhage. Venovenous ECMO was utilized in all but 1 case, in which emergent attempted venoarterial ECMO was unsuccessful in resuscitating a postpartum patient with cardiac arrest and a massive pulmonary embolism. A total of 4 women were initiated on ECMO during pregnancy: their gestational ages at ECMO initiation were 21, 22, 29, and 30 weeks; maternal survival was 50%, and fetal mortality was 50%. A case of ECMO initiated during cesarean section at 29 weeks’ gestation resulted in both maternal and fetal survival. Among 4 mothers with ECMO initiation after childbirth, none survived. Finally, we found a tendency toward survival in those patients for whom ECMO was initiated soon after mechanical ventilation, earlier in the disease process. In contrast, in this study, 23 of 45 women of reproductive age (51%) who were not pregnant but underwent ECMO survived.

Conclusion

When ECMO was initiated during pregnancy or during childbirth, 60% of mothers and fetuses survived, supporting current use of ECMO as a salvage therapy in pregnant and intrapartum women. In this generally young and healthy population, ECMO has the potential to increase the survival rates of both mother and fetus and should be considered a salvage therapy for peripartum women with reversible forms of cardiorespiratory failure.

Epidemiology, lung mechanics and outcomes of ARDS: A comparison between pregnant and non-pregnant subjects

PURPOSE

We describe the epidemiology, lung mechanics and outcomes of acute respiratory distress syndrome (ARDS) complicating pregnancy. We also compare the outcomes of ARDS in pregnant and non-pregnant females.

METHODS

Retrospective observational study of all women admitted with ARDS.

RESULTS

211 women with ARDS were admitted, which included 27 (12.8%) pregnant subjects. All were ventilated with a low tidal volume strategy. Most pregnant females presented during the third trimester. There was no difference in the lung compliance, the applied PEEP and the plateau pressures across trimesters. The pregnant females had a lower median age (25 [22-28] vs. 32 [22-42] years, p = 0.003), higher proportion of severe ARDS (40.8% vs. 10.3%, p < 0.0001), and higher driving pressure (18.2 vs. 15.5 cm H₂O, p = 0.03) compared to non-pregnant females. The maternal (18.5%) and perinatal (37%) mortality was high. However, the mortality was not different between pregnant and non-pregnant subjects with ARDS. On a multivariate logistic regression analysis, the baseline APACHE II score, driving pressure and the delta SOFA score were independent predictors of mortality.

CONCLUSIONS

ARDS complicating pregnancy is severe and is associated with high perinatal mortality. However, the outcomes of ARDS in pregnant females were similar to non-pregnant females.

Pregnancy complicated by influenza A ARDS requiring consecutive VV-ECMO treatment with successful vaginal delivery

A 29-year-old woman presented with influenza A ARDS at 23⁺⁰ weeks of gestation. Mechanical ventilation failed and VV-ECMO was started in a non-ECMO hospital. Transportation was performed on ECMO. Within 5 days ECMO weaning was successful. Fetal condition was stable, and decision to continue pregnancy was taken. However, second VV-ECMO was needed due to ventilator-associated pneumonia. At 25⁺⁶ weeks, the patient spontaneously delivered a neonate vaginally. Patient's condition improved, and ECMO could be removed 10 days postpartum. 2-year follow-up showed no severe consequences in the mother and the child.

Indications and characteristics of obstetric patients admitted to the intensive care unit: a 22-year review in a tertiary care center

Objective

Reviewing indications and characteristics of obstetric patients admitted to the intensive care unit (ICU) of a tertiary care center, comparing those patients by time period and place of delivery, and to verify clinical utility of acute physiology and chronic health evaluation (APACHE) II score in ICU-admitted women.

Methods

Retrospective analyses were carried out for parturients admitted to the ICU of our institution from 1994 to 2015. Clinical characteristics were compared between time period (period 1: 1994-2004; period 2: 2005-2015) and place of delivery (our institution and local hospitals). Receiver operating characteristic (ROC) curve analysis was used to evaluate the usefulness of APACHE II score to predict maternal mortality.

Results

During 22-year period, 176 women required ICU admission, showing the incidence of 2.2 per 1,000 deliveries. The most common reason for ICU admission was postpartum hemorrhage (56.3%), followed by hypertensive disorders (19.3%), sepsis (3.4%), and pulmonary and amniotic fluid embolism (2.3%). Period 2 showed older maternal age (32.7±4.8 vs. 30.8±4.4 years, P=0.006, higher embolization rate (26.4% vs.1.2%, P<0.001), and lower hysterectomy rate (30.8% vs. 49.4%, P=0.012). Cases from local hospitals showed significantly higher proportion of postpartum hemorrhage (84.5% vs. 42.2%, P<0.001). Overall maternal death occurred in 5.1% (9/176) including 6 direct maternal deaths. The APACHE II score showed area under the ROC curve of 0.813 (confidence interval [CI], 0.607-1.000) for prediction of maternal mortality.

Conclusion

The incidence of obstetric ICU admission was 2.2 per 1,000 deliveries and the most common reason was postpartum hemorrhage followed by hypertensive disorders. APACHE II score could be used to predict mortality in obstetric ICU admission.

Practice Bulletin No. 170: Critical Care in Pregnancy

Critical care in pregnancy is a field that remains unevenly researched. Although there is a body of evidence to guide many recommendations in critical care, limited research specifically addresses obstetric critical care. The purpose of this document is to review the available evidence, propose strategies for care, and highlight the need for additional research. Much of the review will, of necessity, focus on general principles of critical care, extrapolating where possible to obstetric critical care.

Respiratory Considerations Including Airway and Ventilation Issues in Critical Care Obstetric Patients

Critical care management of the obstetric patient can present unique challenges. Parturients who present with respiratory distress can suffer from a multitude of etiologies, and each diagnosis must be pursued as appropriate to the clinical picture. Normal physiologic changes of pregnancy may obscure the presentation and diagnosis, and irrelevant of the cause, pregnancy may complicate the management of hypoxic and hypercarbic respiratory failure in this patient population. In addition to these concerns, both anticipated and unanticipated difficult airway management, including difficulty ventilating and intubating, are more common during pregnancy and may be encountered during endotracheal tube placement.

Trauma and Considerations Unique to Pregnancy

Trauma complicates 6% to 7% of all pregnancies and requires multidisciplinary education and training for both trauma and obstetric teams to achieve the best outcome. It is important to understand the mechanisms of certain adverse maternal and fetal/neonatal outcomes incurred as a result of trauma, as well as caveats to pregnancy physiology that make some injuries more likely and detection of maternal compromise more difficult. This article focuses on these caveats and how to incorporate these into ongoing trauma protocols and offers suggestions for the formation of obstetric trauma response team.

Core Research Teams: A strategy to research critically ill pregnant and postnatal women

There has been little research conducted on critically ill pregnant and postnatal women. When developing a research protocol to conduct a prospective multi-centre survey on this study population, we found there were vital concerns that needed addressing prior to the research proceeding. Prompt identification of the study population and valid, reliable data collection were two aspects that needed particular attention with study recruitment potentially occurring in a total of eleven clinical areas from seven hospitals. In this paper we outline the particular issues faced by us when conducting multi-centre research on a study population that occurs infrequently and unpredictably, and when there is a necessary urgency to identify eligible study participants. The key strategy to overcome these difficulties, was the creation of 'Core Research Teams' in each clinical area. Our experience of using Core Research Teams in our pilot study is described in this paper. We found that the Core Research Team model is a very positive strategy to overcome the methodological challenges when operating a multi-centre study.

Acute respiratory distress syndrome in a pregnant woman with systemic lupus erythematosus: a case report

When the disease activity of systemic lupus erythematosus (SLE) is controlled appropriately, a pregnant woman who has lupus is able to carry safely to term and deliver a healthy infant. While the physiology of a healthy pregnancy itself influences ventilatory function, acute pulmonary distress may decrease oxygenation and influence both mother and fetus. Though respiratory failure in pregnancy is relatively rare, it remains one of the leading conditions requiring intensive care unit admission in pregnancy and carries a high risk of maternal and fetal morbidity and mortality, not to mention the complexity caused by lupus flare. We report a case of SLE complicated with lupus pneumonitis and followed by acute respiratory distress during pregnancy. Though there is a high risk of maternal and fetal morbidity and mortality, maternal respiratory function improved after cesarean section and treatment of the underlying causes. The newborn had an extremely low birth weight but was well at discharge.

Evaluation of obstetric admissions to intensive care unit of a tertiary referral center in coastal India

Background and Aim:

To evaluate the occurrence, indications, course, interventions, and outcome of obstetric patients admitted to the intensive care unit (ICU).

Design:

Retrospective study.

Setting:

ICU of a Medical College Hospital.

Materials and Methods:

The data collected were age, parity, obstetric status, primary diagnosis, interventions, and outcome of obstetric patients admitted to the ICU from Jan 2005 to June 2011.

Results:

Total deliveries were 16,804 in 6.5 years. Obstetric admissions to the ICU were (n = 65) which constitutes 0.39% of deliveries. Majority of the admissions were in the postpartum period (n = 46, 70.8%). The two common indications for admission were obstetric hemorrhage (n = 18, 27.7%) and pregnancy related hypertension with its complications (n = 17, 26.2%). The most common intervention was artificial ventilation (n = 41, 63%). The mortality among obstetric admissions in the ICU was (33.8% (22/65)). The patients appropriate for High Dependency Unit (HDU) care was (32.3% (21/65)). The statistical analysis was done by fractional percentage and Chi-square test.

Conclusions:

Hemorrhage and pregnancy-related hypertension with its complications are the two common indications for ICU admissions. The need for a HDU should be considered.

Infection and acute respiratory distress syndrome during pregnancy: a case series of preventable maternal deaths from southern India

INTRODUCTION

Acute respiratory distress syndrome (ARDS) is common among women admitted to obstetric intensive care units, and it contributes significantly, both directly and indirectly, to maternal deaths.

CASE SERIES

We present a case series of ARDS in pregnant women caused by non-obstetric causes. The women were treated at a tertiary hospital in southern India. The striking features were delayed referral from the primary care unit and the lack of a primary diagnosis or treatment. Undiagnosed rheumatic heart disease, anemia, and malaria and H1N1 epidemics contributed to these cases of ARDS and maternal death.

CONCLUSION

It is necessary to increase the awareness of evidence-based uniform protocols to tackle common medical complaints during pregnancy.

Pre-eclampsia-eclampsia admitted to critical care unit

OBJECTIVE

To evaluate women with hypertensive disorder admitted to critical care unit.

METHODS

This study was carried out in Cartagena, Colombia, between January 2006 and December 2009. Patients were divided into 4 groups; severe pre-eclampsia, eclampsia, HELLP syndrome and HELLP with eclampsia (HEEH).

RESULT

A total of 217 cases were admitted. The admitting diagnoses were severe pre-eclampsia without HELLP syndrome (39.2%), HELLP syndrome without eclampsia (33.6%), eclampsia without HELLP syndrome (20.3%) and Eclampsia with HELLP syndrome or HEEH (6.9%). Groups were similar with respect to parity (p = 0.25), gestational age (p = 0.11), cesarean section (p = 0.58), mechanical ventilation (p = 0.54), level of systolic (p = 0.48) and diastolic blood pressure (p = 0.15) and inotropic support (p = 0.32). Average total duration of hospitalization was significantly different among groups, more time in women with HEEH (p = 0.001). Multiple organ dysfunctions was diagnosed > 70% of all women admitted to intensive care, but was significantly more frequent in patients with HELLP syndrome and HEEH (p = 0.001). There were 5 maternal deaths (2.3%). Causes of maternal death were intracranial hemorrhage (3), intra-abdominal bleeding (1) and pulmonary complications (1).

CONCLUSION

Women with HELLP syndrome with or without eclampsia are associated with major morbidity and mortality. Therefore, the maternal outcome in eclampsia is influenced for HELLP syndrome.

Clinical characteristics and outcomes of critically ill obstetric patients: a ten-year review

BACKGROUND AND OBJECTIVES

Pregnancy and delivery can involve complications that necessitate admission to critical care facilities. The objective of our study was to assess the incidence, indications, and outcomes of obstetric patients requiring admission to an intensive care unit (ICU) in a tertiary care hospital, in Saudi Arabia.

DESIGN AND SETTING

Retrospective cohort study of consecutive obstetric admissions to the ICU at the King Abdulaziz Medical City over a 10-year period.

PATIENTS AND METHODS

We collected baseline demographic data and acute physiology and chronic health evaluation II (APACHE II) scores. ICU mortality was the primary outcome.

RESULTS

Over 10 years, 75 obstetric patients were admitted to the ICU, and 59 of these patients (78.6%) were admitted during the antepartum period. The main obstetric indication for ICU admission was pregnancy-induced hypertension (21 patients, 28%) and the leading non-obstetric indication was sepsis (12 patients, 16%). The APACHE II score was 19.59 (15.05). The predicted mortality rate based on the APACHE II score was 21.97%; however, there were only six maternal deaths (8%) among the obstetric patients admitted to the ICU.

CONCLUSION

The overall mortality was low. A team approach facilitated the application of optimal care to these patients. Obstetric patients had better outcomes than those predicted by the APACHE II scores. Appropriate antenatal care is important for preventing obstetric complications.

The management of the critically ill obstetric patient

Hypertensive disorders, postpartum hemorrhage, and sepsis are the most common indications for intensive care unit admission among obstetric patients. In general, ICU mortality is low, and better than would be predicted using available mortality prediction tools. Provision of care to this special population requires an intimate understanding of physiologic changes that occur during pregnancy. Clinicians must be aware of the way various diagnostic and treatment choices can affect the mother and fetus. Most clinically necessary radiographic tests can be safely performed and fall under the maternal radiation exposure limit of less than 0.05 Gray (Gy). Careful attention must be paid to acid-base status, oxygenation, and ventilation when faced with respiratory failure necessitating intubation. Cesarean delivery can be justified after 4 minutes of cardiac arrest and may improve fetal and maternal outcomes. The treatment of obstetric patients in the ICU introduces complexities and challenges that may be unfamiliar to many critical care physicians; teamwork and communication with obstetricians is crucial.

Obstetric critical care: A prospective analysis of clinical characteristics, predictability, and fetomaternal outcome in a new dedicated obstetric intensive care unit

A 1 year prospective analysis of all critically ill obstetric patients admitted to a newly developed dedicated obstetric intensive care unit (ICU) was done in order to characterize causes of admissions, interventions required, course and foetal maternal outcome. Utilization of mortality probability model II (MPM II) at admission for predicting maternal mortality was also assessed. During this period there were 16,756 deliveries with 79 maternal deaths (maternal mortality rate 4.7/1000 deliveries). There were 24 ICU admissions (ICU utilization ratio 0.14%) with mean age of 25.21±4.075 years and mean gestational age of 36.04±3.862 weeks. Postpartum admissions were significantly higher (83.33% n=20, P<0.05) with more patients presenting with obstetric complications (91.66%, n=22, P<0.01) as compared to medical complications (8.32% n=2). Obstetric haemorrhage (n=15, 62.5%) and haemodynamic instability (n=20, 83.33%) were considered to be significant risk factors for ICU admission (P=0.000). Inotropic support was required in 22 patients (91.66%) while 17 patients (70.83%) required ventilatory support but they did not contribute to risk factors for poor outcome. The mean duration of ventilation (30.17±21.65 h) and ICU stay (39.42±33.70 h) were of significantly longer duration in survivors (P=0.01, P=0.00 respectively) versus non-survivors. The observed mortality (n=10, 41.67%) was significantly higher than MPM II predicted death rate (26.43%, P=0.002). We conclude that obstetric haemorrhage leading to haemodynamic instability remains the leading cause of ICU admission and MPM II scores at admission under predict the maternal mortality.

Acute respiratory failure in pregnancy

The maternal respiratory tract undergoes significant anatomic and physiologic changes during pregnancy, which increase maternal susceptibility to respiratory failure. Respiratory failure in pregnancy is relatively rare, but it remains one of the leading conditions requiring intensive care unit admission in pregnancy and carries a high risk of maternal and fetal morbidity and mortality. Acute respiratory failure can result from a variety of conditions, most of which are not pulmonary in origin. Early diagnosis of underlying disease is critical, as it will guide the management approach. Treatment goals during respiratory failure in the pregnant woman are similar to those outside of pregnancy-to maintain adequate ventilation and to provide hemodynamic and nutritional support. Additionally, the obstetrician will need to monitor fetal status and help to determine the best timing for delivery.

Indications and outcome for obstetric patients' admission to intensive care unit: a 7-year review

The objective of this retrospective study was to investigate the indications, interventions and clinical outcome of pregnant and newly delivered women admitted to the multidisciplinary intensive care unit at the King Abdullah University Hospital in Jordan over a 7-year period from January 2002 to December 2008. The collected data included demographic characteristics of the patients, mode of delivery, pre-existing medical conditions, reason for admission, specific intervention, length of stay and maternal outcome. A total of 43 women required admission to the intensive care unit (ICU), which represented 0.37% of all deliveries. The majority (95.3%) of patients were admitted to the ICU postpartum. The most common reasons for admissions were (pre)eclampsia (48.8%) and obstetric haemorrhage (37.2). The remainder included adult respiratory distress syndrome (6.9%), pulmonary embolism (2.3%) and neurological disorders (4.6%). Mechanical ventilation was required to support 18.6% of patients and transfusion of red blood cells was needed for 48.8% of patients. There were three maternal deaths (6.9%). A multidisciplinary team approach is essential to improve the management of hypertensive disorders and postpartum haemorrhage to achieve significant improvements in maternal outcome. A large, prospective study to know which women are at high risk of admission to the intensive care units and to prevent serious maternal morbidity and mortality is warranted.

Respiratory failure in pregnant women infected by Swine-Origin influenza A (H1N1)

Two pregnant women developed acute respiratory distress syndrome from Swine-Origin influenza A (H1H1) virus. They were put on mechanical ventilation. We discussed the issues that face obstetricians and intensive care physicians in such situations.

[Pregnancy and pandemic influenza A(H1N1) 2009. Current concepts for anaesthesia and critical care medicine]

Pregnant women are particularly vulnerable to the pandemic influenza A(H1N1) 2009. Indeed, they are at high risk of developing a severe or fatal form of the disease. The physiological changes and the "immune deviation" from cellular to humoral immunity occurring during pregnancy are hypotheses to explain this vulnerability. Severe forms, mainly viral pneumonias, require an urgent prescription of an effective antiviral therapy. Preventive measures, mainly vaccination, are essential to avoid the appearance of these severe forms.

Use of noninvasive positive pressure ventilation during pregnancy: case series

Mechanical ventilation is commonly required in critically ill pregnant patients, requiring ICU admission, with higher morbidity and mortality related to airway management. Alternatively, noninvasive positive pressure ventilation (NIPPV) is increasingly used to treat nonpregnant patients. Pregnancy has been a contraindication to its use. We would like to report a case series of successful use of NIPPV in pregnancy.

NIPPV is increasingly used to treat hypoxemic respiratory failure. It has rarely been used during pregnancy. On the other hand, acute respiratory failure (ARF) remains a leading cause of ICU admission in obstetric patients. The use of NIPPV in managing ARF in pregnant patients was not investigated. We report the outcome of treatment with NIPPV of four sickle cell disease pregnant patients with ARF caused by acute chest syndrome. Median APACHE II score for the four cases was 27. Intubation was avoided in all cases. None had aspiration. Mean duration of NIPPV was 40 h with ICU discharge after a mean of 4 days.

[Morbidity and mortality of patients with preeclampsia or HELLP syndrome transferred in intensive care]

CONTEXT

During pregnancy, the two leading causes of admission in intensive care are preeclampsia and obstetric haemorrhage. However, there are few studies about preeclamptic patients admitted in intensive care. Our purpose was to determine the outcome of pregnancies with preeclampsia and/or HELLP syndrome admitted in intensive care.

METHODS

We performed a retrospective study between March 1996 and April 2005 in a level III maternity. 533 patients were managed with preeclampsia and/or HELLP syndrome during this period. We compared patients admitted in intensive care with patients who did not require admission in intensive care.

RESULTS

Sixty six patients (12,4%) with preeclampsia and/or HELLP were admitted in intensive care. Severe HELLP syndrome, eclampsia, neurological troubles and acute pulmonary oedema were the four leading causes of admission. The mean duration of admission was 3, 2+/-2,9 days. Mean age of the patients (28, 2+/-5,8 vs. 29,0+/-5,8 years, NS) and number of primiparous (71, 2% vs 66,6%, NS) were similar between the two groups. The mean gestational age of delivery was reduced when patients were needed admission in intensive care (29,8+/-3,9 weeks of gestation versus 32,5+/-4,4, p<0,001). 77, 3% of babies survived in the intensive care group compared with 90,4% in the other group (p<0,01).

CONCLUSION

The short-term outcome of patients admitted in intensive care for preeclampsia or HELLP syndrome is generally good. However, neonatal morbidity and mortality remained important when women needed management in intensive care.

Infection in obstetric critical care

Infections in critically ill obstetric patients are observed worldwide, although the incidence, aetiology and patient outcome vary between geographic locations. This chapter focuses on sepsis, with emphasis on the pathophysiology, outcome and specific management issues.

Severe acute respiratory distress syndrome in pregnancy. Caesarean section in the second trimester to improve maternal ventilation

We report the case of a 25-year-old woman in the second trimester of pregnancy with acute respiratory distress syndrome associated with miliary tuberculosis. Delivery of the baby by caesarean section at 24 weeks gestation resulted in an immediate and sustained improvement in respiratory function and maternal survival. We believe this to be the first report suggesting a role for caesarean section, performed with the aim of an improvement in maternal respiratory function, at such an early point in pregnancy.

Pregnancy, delivery and the intensive care unit: need, outcome and management

PURPOSE OF REVIEW

Increasing numbers of sick pregnant and peripartum women are cared for in the intensive care unit. This review looks at the current mortality, the disease severity of admitted patients and the current need for intensive care unit and high dependency unit beds to cater for these women. It also looks at some recent advances in the treatment of some specific disease entities encountered in the intensive care unit in pregnant women and parturients which have been covered in the 2001-2002 literature.

RECENT FINDINGS

There has been a substantial fall in intensive care unit mortality in the last decade and there is a definite place for these women in intensive care unit. They represent a subgroup of severely ill patients with a need for intensive treatment and monitoring and who are worth the investment in time and money because they often recover from their acute illness to return to full productivity.

SUMMARY

The high dependency unit and intensive care unit and their role in the service to the pregnant woman and parturient are the main focus of this review which looks at the last 2 years' literature to determine the critical care services' worth and efficacy. In almost all countries, even in the smaller regional hospitals, the intensive care units and high dependency units have reduced maternal mortality and morbidity. The neonatal high dependency units have done much the same for the newborn but the neonatal literature is not reviewed for the purposes of this symposium.

Clinical characteristics and outcomes of obstetric patients requiring ICU admission

OBJECTIVES

To review a series of critically ill obstetric patients admitted to our ICU to assess the spectrum of disease, required interventions, and fetal/maternal mortality, and to identify conditions associated with maternal death.

DESIGN

Retrospective cohort.

SETTING

Medical-surgical ICU in a university-affiliated hospital.

PATIENTS

Pregnant/postpartum admissions between January 1, 1998, and September 30, 2005.

INTERVENTIONS

None.

MEASUREMENTS AND RESULTS

We studied 161 patients (age, 28 +/- 9 years; mean gestational age, 29 +/- 9 weeks) [mean +/- SD], constituting 10% of 1,571 hospital admissions. APACHE (acute physiology and chronic health evaluation) II score was 14 +/- 8, with 24% predicted mortality; sequential organ failure assessment score was 5 +/- 3; and therapeutic intervention scoring system at 24 h was 25 +/- 9. Forty-one percent of patients required mechanical ventilation (MV). ARDS, shock, and organ dysfunction were present in 19%, 25%, and 48% of patients, respectively. Most patients (63%) were admitted postpartum, and 74% of admissions were of obstetric cause. Hypertensive disease (40%), major hemorrhage (16%), septic abortion (12%), and nonobstetric sepsis (10%) were the principal diagnoses. Maternal mortality was 11%, with multiple organ dysfunction syndrome (44%) and intracranial hemorrhage (39%) as main causes. There were no differences in death rate in patients admitted for obstetric and nonobstetric causes. Fetal mortality was 32%. Only 30% of patients received antenatal care, which was more frequent in survivors (33% vs 6% nonsurvivors, p = 0.014).

CONCLUSIONS

Although ARDS, organ failures, shock, and use of MV were extremely frequent in this population, maternal mortality remains within an acceptable range. APACHE II overpredicted mortality in these patients. Septic abortion is still an important modifiable cause of mortality. Efforts should concentrate in increasing antenatal care, which was clearly underprovided in these patients.

Critical care of the obstetric patient

The obstetric patient poses exceptional challenges in the intensive care unit. Knowledge of the physiologic changes of pregnancy and specific pregnancy-related disorders is necessary for optimal management. Intensive care unit diagnoses may include preeclampsia, including the HELLP syndrome, pulmonary embolic disease, amniotic fluid embolism, status asthmaticus, respiratory infection, the acute respiratory distress syndrome, and sepsis. The management of mechanical ventilation is based on principles of avoiding lung injury, and hypercapnia may be tolerated even during the pregnancy. When the clinician is faced with the extraordinary instance of cardiopulmonary arrest, perimortem cesarean delivery must be considered to improve the potential for maternal and fetal survival.

Obstetric critical care: a blueprint for improved outcomes

INTRODUCTION

Obstetric patients are generally young and healthy. However, the potential for catastrophic complications is real, and despite the therapeutic advances of the last few decades, maternal morbidity and mortality continue to occur. This may be related to the pregnancy itself, aggravation of a preexisting illness, or complications of the (operative) delivery.

PURPOSE

The purpose of this review is two-fold: first, to provide an update on currently available reports pertaining to important critical care issues of the obstetric patient population and, second, to present current comprehensive treatment options for preeclampsia and massive obstetric hemorrhage because both are responsible for the majority of maternal mortality and morbidity worldwide.

RESULTS

The most common reasons for intensive care unit admission are hypertensive disorders and massive obstetric hemorrhage. Timely delivery and prompt initiation of antihypertensive therapy for severe hypertension form the mainstay of care in preeclampsia. Restoration of circulating blood volume and rapid control of bleeding and impaired coagulation are the main factors in the management of massive obstetric hemorrhage. Puerperal morbidity has become the main topic of quality of care issues in maternity care. Although the Acute Physiology and Chronic Health Evaluation II score is commonly used in the intensive care unit, it does not seem to be appropriate for pregnant women because it overestimates their mortality rates. A high-dependency care unit suits the needs for at least half of the obstetric patient population in need of higher acuity care and will save considerable cost.

CONCLUSION

Emphasis on early detection of maternal problems and prompt referral to tertiary centers with intensive care unit facilities to provide optimum care of the circulation, blood pressure, and respiration at an early stage could minimize the prevalence of multiple organ failure and mortality in critically ill obstetric patients.

Caring for pregnant and postnatal women in intensive care: what do we know?

Critically ill pregnant and postnatal women admitted to intensive care units (ICUs) require highly specialised care, components of which many critical care nurses are unfamiliar with. There are no specialist critical care obstetric centres in Australia, with critically ill obstetric patients admitted to general ICUs. There are no published guidelines and little research that assist critical care nurses to care for such women. Furthermore, the admission of pregnant or postnatal women to ICUs is likely to increase with emerging childbearing patterns in Australia. It is therefore timely to review what we know about caring for critically ill pregnant and postnatal women. This paper analyses the literature on intensive care utilisation by obstetric patients and provides an overview regarding which pregnant and postpartum women require intensive care. The key areas of providing mechanical ventilation to pregnant women and assessment of fetal wellbeing are explored in detail. The most frequent conditions and their treatment, preeclampsia and obstetric haemorrhage, are also reviewed. The establishment of lactation is also considered as the critical carenurse is commonly involved in supporting the woman's endeavour to breastfeed.

Obstetric admissions to the intensive care unit: a 12-year review

OBJECTIVE

The objective was to ascertain the prevalence, causes and outcome of critically ill obstetric patients admitted to the intensive care unit (ICU).

DESIGN

The design was a retrospective collection of data.

SETTINGS

The setting was a multidisciplinary ICU in a University hospital.

PATIENTS

All obstetric patients admitted to the ICU over a 12-year period from May 1992 to April 2004 were reviewed.

METHODS

Data collected included demographic characteristics of the patients, pre-existing medical conditions, obstetric complications, invasive procedures required in the ICU and outcome of the patients.

RESULTS

The incidence of obstetric admissions to the ICU represented 0.22% of all deliveries during the study period. The majority (84.4%) of patients were admitted to the ICU postpartum. Obstetric haemorrhage (32.8%) and pregnancy-induced hypertension (17.2%) were the two main obstetrical reasons for admission. The remainder included medical disorders (37.5%) and other causes (6.2%). Associated major complications included adult respiratory distress syndrome (ARDS) and HELLP (haemolysis, elevated liver enzymes and low platelets) syndrome. The perinatal mortality rate was 20% and the maternal mortality rate 9.4%.

CONCLUSIONS

A team approach consisting treatment by obstetricians, intensive care specialists and anaesthesiologists provided optimal care for the patients. Improved management strategies for obstetric haemorrhage and hypertension may significantly reduce maternal morbidity.

Neurologic disorders in pregnancy

BACKGROUND

Neurologic dysfunction, coma, and seizures are common in obstetric patients in the intensive care unit.

OBJECTIVE

To review common neurologic disorders resulting in critical illness in pregnancy.

REVIEW

Obstetric disorders causing coma and seizures include eclampsia, acute fatty liver of pregnancy, and amniotic fluid embolism. Preexisting disorders such as epilepsy may worsen in one-third of pregnant patients, and seizures are common during labor. Changes in hemodynamics, blood volume, and hormonal effects on the vessel wall increase risk of bleeding from berry aneurysms and arteriovenous malformations during pregnancy and the postpartum period. Acute intermittent porphyria produces seizures and hypertension, closely mimicking eclampsia. Cerebral venous sinus thrombosis is common in postpartum patients, especially in developing countries. Brain tumors invariably enlarge during pregnancy because of fluid retention and the presence of estrogen and progesterone receptors on tumor cells. Infections such as cerebral malaria and acute viral hepatitis with fulminant hepatic failure are common causes of coma and seizures during pregnancy in tropical regions of Asia, Africa, and Latin America. Patients may be admitted to the intensive care unit with type II respiratory failure due to myasthenic crisis, Guillain-Barre syndrome and spinal cord disease. Relapses of multiple sclerosis are infrequent during pregnancy but increase in the postpartum period.

CONCLUSIONS

In all instances, the effects of the disorders, diagnostic tests, and treatment on the fetus must be carefully weighed. Prompt delivery may be lifesaving for mother and fetus in conditions such as eclampsia and acute fatty liver of pregnancy; expectant treatment may be more appropriate in others.

Acute respiratory distress syndrome in pregnancy

OBJECTIVE

To summarize the pathophysiology and treatment of acute lung injury and acute respiratory distress syndrome (ARDS) during pregnancy.

DATA SOURCE

Review of select articles from MEDLINE, including published abstracts, case reports, observational studies, controlled trials, review articles, and institutional experience.

DATA SUMMARY

ARDS occurs in pregnancy and may have unique causes. Despite extensive clinical research to improve the management of ARDS, mortality remains high, and few strategies have shown a mortality benefit. Furthermore, in most published studies, pregnancy is an exclusionary criterion, and thus, few treatments have been adequately evaluated in obstetric populations. The treatment of ARDS in pregnancy is extrapolated from studies performed in the general ARDS patient population, with consideration given to the normal physiologic changes of pregnancy. In general, the best support of the fetus is support of the mother. From the age of viability (24-26 wks at most institutions) until full term, decisions regarding delivery should be made based primarily on the standard obstetric indications.

CONCLUSIONS

Little evidence exists regarding the management of ARDS specifically in pregnancy, and thus, treatment approaches must be drawn from studies performed in a general patient population. A multidisciplinary approach involving maternal-fetal medicine, neonatology, anesthesiology, and intensivist clinicians is essential to optimizing maternal and fetal outcomes.

Critically ill obstetric patients in an American and an Indian public hospital: comparison of case-mix, organ dysfunction, intensive care requirements, and outcomes

OBJECTIVE

To compare case-mix, health care practices, and outcome in obstetric ICU admissions in inner-city teaching hospitals in economically developed and developing countries.

DESIGN

Retrospective study.

SETTING

Ben Taub General Hospital (BTGH), Houston, Texas, and King Edward Memorial Hospital (KEMH), Mumbai, India.

PATIENTS

Women admitted during pregnancy or 6 weeks postpartum between 1992 and 2001.

MEASUREMENTS AND RESULTS

Patients from BTGH (n=174) and KEMH (n=754) had comparable age, number of organs affected, incidence of medical disorders (30%), liver dysfunction, and thrombocytopenia. Fewer KEMH patients received prenatal care (27 vs 86%) and came to hospital within 24 h of onset of symptoms (60 vs 90%). They had higher APACHE II scores (median 16 vs 10), greater incidence of neurological (63 vs 36%), renal (50 vs 37%), and cardiovascular dysfunction (39 vs 29%). Severe malaria, viral hepatitis, cerebral venous thrombosis, and poisoning were common medical disorders. The BTGH group had higher incidence of respiratory dysfunction (59 vs 46%) and disseminated intravascular coagulation (40 vs 23%), placental anomalies, HELLP syndrome, chorioamnionitis, peripartum cardiomyopathy, puerperal sepsis, urinary infection, bacteremia, substance abuse, and asthma. More BTGH patients required mechanical ventilation and blood component therapy, whereas more KEMH patients needed dialysis. Of BTGH patients, 78.2% were delivered by cesarean section (vs 15.4%). Maternal (2.3 vs 25%) and fetal (13 vs 51%) mortality were lower in BTGH patients.

CONCLUSIONS

There were marked differences in medical diseases, organ failure, and intensive care needs. Higher mortality in the Indian ICU may be due to difference in case mix, inadequate prenatal care, delay in reaching hospital, and greater severity of illness.

Obstetric admissions to an intensive therapy unit

Complications of pregnancy may necessitate admission to an Intensive Therapy Unit (ITU). All obstetric patients admitted to ITU were reviewed in order to assess whether these admissions could have been predicted and to determine the place of intensive care compared with high dependency nursing. Case notes of 122 women from a total group of 144 women admitted to an ITU of an inner-city hospital from 1989-1993 were reviewed retrospectively. The majority of women (67%) had no pre-existing medical or obstetric history. The major indications for admission were hypertensive disease of pregnancy (66%) and haemorrhage (19%); 79% followed caesarean section and 40% required ventilatory support. The perinatal mortality rate was 6% and there were three maternal deaths. The need for admission to ITU was unpredictable in two-thirds of the cases. Many of the women evaluated in this review were ineligible for high dependency care and required full ITU facilities, both of which will always be needed to deal with serious complications of pregnancy.

Critically ill parturient women and admission to intensive care: a 5-year review

Thirty-nine parturient women were admitted to a general intensive care unit (ICU) from April 1989 to March 1994 and of these four were readmitted (total 43 admissions). Twelve women were admitted to the obstetric unit from peripheral hospitals in different regions, but no requirement for intensive care was perceived on referral. Six women were transfered directly into the intensive care unit from different hospitals in the region. The incidence of obstetric patients requiring ICU admission, excluding direct transfers, was 0.64%. The majority (85%) were postpartum, and 64% were primiparous. Morbidity was caused primarily by hypertensive disorders (33%) and haemorrhage (33%). The remainder included medical disorders (21%)[ sepsis (13%) and surgical problems (5%). Associated major complications were acute renal failure, coagulopathies and adult respiratory distress syndrome. A multidisciplinary approach to management is practised and specialist interventions included haemofiltration and haemodialysis (18%) and radiological arterial embolisation (10%). Ventilatory and inotropic support were given in 38% and 41% of patients respectively. Only one patient died on the intensive care unit, this was from multiorgan failure secondary to sepsis.

Intensive care use by critically ill obstetric patients: a five-year review

This is a retrospective analysis of all obstetric admissions to the surgical intensive care unit over the five-year period beginning July 1, 1994. The admission diagnosis, mode of delivery, anaesthetic employed and patient outcome were assessed. There were 43 obstetric admissions during this period, with 38 deliveries. This represents 0.32% of the deliveries in this hospital during the study period. The median duration of stay was three days (range 1-21). Haemorrhage and pregnancy-induced hypertension accounted for the majority of obstetric complications. Anaesthesia may have contributed to the admission of eight patients. Eight patients had more than one admission diagnosis. There were two deaths and one case of major morbidity (hypoxic encephalopathy) in this series. Prolonged ventilation and/or inotropic support were generally not required. In conclusion, approximately 3 per 1000 maternities require intensive care in this institution. The majority are discharged after a short stay with good outcome.

Critical illness and pregnancy: review of a global problem

Obstetric patients are a small but important group of patients in the intensive care unit (ICU). Their problems are unique and need specialized attention. Decision making may be confounded by physiologic changes in pregnancy. In developed countries with good antenatal care, comparatively fewer obstetric patients are admitted to ICUs, but the maternal mortality rate remains high in the developing countries. Medical disorders and organ dysfunction caused by critical illness of pregnancy differ from region to region. With improvement in antenatal care, the number of ICU admissions for obstetric disorders would decline in developing countries; however, this number may increase gradually in developed countries because of increasing maternal age and pregnancies in women with complicated chronic medical disorders.

Acute lung injury and acute respiratory distress syndrome in pregnancy

Acute respiratory failure can be the result of a variety of clinical conditions, such as congestive heart failure, pneumonia, pulmonary embolism, exacerbation of obstructive lung diseases, and acute respiratory distress syndrome (ARDS). This article focuses on developments related to acute lung injury and ARDS and reviews epidemiology, pathogenesis and therapeutic advances with an emphasis on the obstetric population. A brief discussion of tocolytic-induced pulmonary edema, preeclampsia, venous air embolism, and aspiration-related ARDS is included. Management of pregnant women with ARDS is outlined.

Critically ill obstetric patients in the intensive care unit

We aimed to determine the morbidity and mortality among obstetric patients admitted to the intensive care unit. In this study, we analyzed retrospectively all obstetric admissions to a multi-disciplinary intensive care unit over a five-year period. Obstetric patients were identified from 4733 consecutive intensive care unit admissions. Maternal age, gestation of newborns, mode of delivery, presence of coexisting medical problems, duration of stay, admission diagnosis, specific intensive care interventions (mechanical ventilation, continuous veno-venous hemofiltration, central venous catheterization, and arterial cannulation), outcome, maternal mortality, and acute physiology and chronic health evaluation (APACHE) II score were recorded. Obstetric patients (n=125) represented 2.64% of all intensive care unit admissions and 0.89% of all deliveries during the five-year period. The overall mortality of those admitted to the intensive care unit was 10.4%. Maternal age and gestation of newborns were similar in survivors and non-survivors. There were significant differences in length of stay and APACHE II score between survivors and non-survivors P < 0.05. The commonest cause of intensive care unit admission was preeclampsia/eclampsia (73.6%) followed by post-partum hemorrhage (11.2%). Intensive care specialists should be familiar with these complications of pregnancy and should work closely with obstetricians.

Mechanical ventilation in an obstetric population: characteristics and delivery rates

OBJECTIVE

The purpose of this study was to describe the characteristics and outcomes of obstetric patients who require mechanical ventilation.

STUDY DESIGN

A review was conducted of obstetric patients who required mechanical ventilation and who received care at our institutions between 1990 and 1998. Data that were collected included maternal demographics, medical condition that necessitated ventilation, delivery status, duration of ventilation, onset of parturition while receiving ventilation, mode of delivery, and maternal and early neonatal morbidity or death.

RESULTS

Fifty-one women were identified; 43 women(84%) received care in the labor and delivery setting. The most common admission diagnoses were preeclampsia/eclampsia (44%), labor/preterm labor (14%), and pneumonia (12%). Forty-three women (86%) were undelivered on admission (mean gestational age, 31.6 weeks). Delivery occurred in 37 women (86%) during their admission; 24 women (65%) underwent cesarean delivery. Eleven women began labor while receiving ventilation; 6 were delivered vaginally. The maternal mortality rate was 14% (7/51 women), and the perinatal mortality rate was 11% (4/37 fetuses).

CONCLUSION

A large number of obstetric patients who receive mechanical ventilation will require delivery because of their condition. Centers that care for such women should form a treatment strategy to coordinate obstetric and medical care for this unique population

A blueprint for obstetric critical care

OBJECTIVE

The purpose of this study was to describe our 2-year experience with 483 critically ill peripartum women and to propose a blueprint for obstetric critical care.

STUDY DESIGN

This was a prospective study to evaluate all admissions to the Obstetric Intermediate Care Unit and obstetric admissions to medical/surgical intensive care units. Our findings are followed by general recommendations for the organization of obstetric critical care.

RESULTS

Almost two thirds of the women had obstetric complications that included pregnancy-associated hypertension and obstetric hemorrhage. Medical disorders were most common in the other one third of the women.

CONCLUSION

An Obstetric Intermediate Care Unit allows for the continuation of care by obstetricians and results in fewer transfers to medical/surgical intensive care units. Patient treatment depends on hospital size and available resources. In most tertiary centers, the critically ill pregnant woman is best cared for by obstetricians in an Obstetric Intermediate Care Unit. In smaller hospitals, transfer to a medical or surgical intensive care unit may be preferable.

Critical care obstetrics and gynecology

The critical care aspects of obstetrics and pregnancy are varied and demand that critical care practitioners have a thorough knowledge of fetal and maternal changes in physiology as pregnancy progresses. Pregnancy can affect every organ system; and organ-specific conditions as well as syndromes that span multiple organ systems were described. Care of the critically ill, pregnant patient requires a true multidisciplinary approach for optimal outcomes. A review of the current concepts and suggestions for therapy were presented.