Maternal cardiac arrest and perimortem caesarean delivery: Evidence or expert-based?

Perimortem cesarean section after severe injury: What you need to know

ABSTRACT

When pregnant patients are involved in traumatic incidents, the trauma clinician encounters two patients-both the mother and the unborn child. Advanced trauma life support dictates that the first priority is the life of the mother; however, there are rare situations where to provide the greatest chance of survival for both the mother and baby, an emergency cesarean section (perimortem cesarean delivery [PMCD]) must be performed. The decision to perform this procedure must occur quickly, and the reality is that a board-certified obstetrician is rarely present, particularly in rural areas. In this review, we provide a rationale for why trauma clinicians should be conversant with PMCDs, present the specific time limitations for performing a PMCD, and discuss the technique to perform a successful PMCD that makes it distinctly different from an elective cesarean delivery. Finally, we will discuss some things that a trauma program can do proactively in an obstetrical resource-poor area of the country to prepare for the rare instances where these procedures are necessary.

Low-Cost, Scalable Simulations in Obstetric Trauma and Resuscitative Hysterotomy for Emergency Medicine Residents

Introduction

Simulation-based learning is essential for health care providers to prepare for rare obstetric emergencies, such as severe trauma and maternal cardiac arrest. These situations demand rapid and prompt actions, often testing the skill of emergency physicians. Resuscitative hysterotomy (RH), a critical procedure in maternal cardiac arrest, requires technical expertise, coordination, and anatomical knowledge. The high cost of commercial trainers and complex existing models restricts accessibility. This resource introduces a low-cost anatomically accurate RH task trainer and assesses its effectiveness in improving skills and confidence among trainee emergency physicians.

Methods

A 20-minute-long case scenario depicted the resuscitation of a pregnant trauma patient with tension pneumothorax and uterine rupture, culminating in maternal cardiac arrest necessitating RH. Residents performed RH on the task trainer under faculty guidance. Feedback followed the Pendleton model, and an online questionnaire gauged the residents' experiences.

Results

Thirty emergency medicine residents participated in the simulation. The questionnaire revealed positive responses, confirming the session's relevance and enhancement of clinical skills and confidence.

Discussion

Our results underscore the RH task trainer's critical role in improving residents' skills and confidence during obstetric trauma simulations. Its realism and effectiveness were notably well received. Future refinements aim to augment fidelity while preserving affordability and integrating regular reinforcement sessions. This innovative educational approach equips health care professionals to respond adeptly to rare and challenging obstetric emergencies, ultimately elevating outcomes for mothers and infants during critical situations.

Enhancing maternal survival in traumatic cardiovascular collapse during pregnancy: A case series on resuscitative hysterotomy (RH) from a level 1 trauma center

BACKGROUND

Trauma during pregnancy presents multifaceted risks to both the developing fetus and the expectant mother due to pregnancy-induced physiological adaptations that affect the response to traumatic injuries. The infrequent occurrence of cardiac arrest during pregnancy necessitates interventions such as perimortem cesarean section (PMCS), now termed resuscitative hysterotomy. While early resuscitative hysterotomy focused primarily on fetal survival, more recent literature reports substantial maternal benefits. Resuscitative hysterotomy can lead to the restoration of maternal pulse and blood pressure within minutes and has shown potential to improve maternal outcomes. RH has been demonstrated to aid in fetal and maternal survival in hemodynamic unstable pregnant patients before cardiovascular collapse. The linguistic change from PMCS to resuscitative hysterotomy is a shift towards maternal-centric approaches and survival.

OBJECTIVE

In this series, we evaluate the outcomes of resuscitative hysterotomy performed before or after cardiovascular collapse to maximize maternal survival while concurrently optimizing fetal outcomes.

METHODS

We performed a retrospective case series review of 4 consecutive pregnant trauma patients who underwent RH due to hemodynamic instability. In addition, we conducted a descriptive analysis of all pregnant patients from 2013 to May 2024 who presented due to a traumatic injury but did not require a RH.

RESULTS

The average age of patients undergoing RH was 26.5 ± 6.8 years. All patients were in the third trimester with a mean gestational age of 32.3 ± 0.5 weeks. Fifty percent (50 %) of patients were involved in motor vehicle accidents, one (25 %) pedestrian was hit by a vehicle, and one (25 %) had GSW to the head. The median time to RH was 14.5 min. The mean estimated blood loss (EBL) was 625 mL ±108.9 mL. The maternal survival rate was 50 %, with a fetal survival rate of 100 %. Three patients achieved hemodynamic stability; however, one of the patients progressed to death by neurological criteria. Therefore, we achieved 50 % of maternal survival. A resuscitative hysterotomy was performed due to early signs of maternal hemorrhagic shock and suggestive features of ongoing bleeding (persistent maternal tachycardia despite adequate analgesia and resuscitation, persistent maternal bradycardia, gradual decline of BP, and FHR abnormalities) in three patients. The remaining patient was found to have cardiac arrest at the scene with a brief return of spontaneous circulation and received resuscitative hysterotomy in the ED to restore cardiovascular function.

CONCLUSION

RH in pregnant patients with traumatic injury and impending hemorrhagic shock or cardiovascular collapse may provide maternal survival benefits by supporting circulatory function and promoting resuscitation with no additional risks to fetal outcomes. Quick decision-making is crucial to the implementation of this life-saving procedure. Further research with a more significant number of patients is needed to validate the efficacy of RH in maximizing maternal survival. This case series adds to the evolving literature on RH, shedding light on practical aspects and maternal outcomes to inform ongoing discussions and strategies for maternal cardiopulmonary resuscitation.

Cardiac Arrest in Special Populations

Best practices in cardiac arrest depend on continuous high-quality chest compressions, appropriate ventilatory management, early defibrillation of shockable rhythms, and identification and treatment of reversible causes. Although most patients can be treated according to highly vetted treatment guidelines, some special situations in cardiac arrest arise where additional skills and preparation can improve outcomes. Situations covered in this section involve cardiac arrest in context of electrical injuries, asthma, allergic reactions, pregnancy, trauma, electrolyte imbalances, toxic exposures, hypothermia, drowning, pulmonary embolism, and left ventricular assist devices.

Outcomes of severely injured pregnant trauma patients: a multicenter analysis

Nearly 10% of pregnant women suffer traumatic injury. Clinical outcomes for pregnant trauma patients (PTPs) with severe injuries have not been well studied. We sought to describe outcomes for PTPs presenting with severe injuries, hypothesizing that PTPs with severe injuries will have higher rates of complications and mortality compared to less injured PTPs. A post-hoc analysis of a multi-institutional retrospective study at 12 Level-I/II trauma centers was performed. Patients were stratified into severely injured (injury severity score [ISS] > 15) and not severely injured (ISS < 15) and compared with bivariate analyses. From 950 patients, 32 (3.4%) had severe injuries. Compared to non-severely injured PTPs, severely injured PTPs were of similar maternal age but had younger gestational age (21 vs 26 weeks, p = 0.009). Penetrating trauma was more common in the severely injured cohort (15.6% vs 1.4%, p < 0.001). The severely injured cohort more often underwent an operation (68.8% vs 3.8%, p < 0.001), including a hysterectomy (6.3% vs 0.3%, p < 0.001). The severely injured group had higher rates of complications (34.4% vs 0.9%, p < 0.001), mortality (15.6% vs 0.1%, p < 0.001), a higher rate of fetal delivery (37.5% vs. 6.0%, p < 0.001) and resuscitative hysterotomy (9.4% vs. 0%, p < 0.001). Only approximately 3% of PTPs were severely injured. However, severely injured PTPs had a nearly 40% rate of fetal delivery as well as increased complications and mortality. This included a resuscitative hysterotomy rate of nearly 10%. Significant vigilance must remain when caring for this population.

2023 HRS expert consensus statement on the management of arrhythmias during pregnancy

This international multidisciplinary expert consensus statement is intended to provide comprehensive guidance that can be referenced at the point of care to cardiac electrophysiologists, cardiologists, and other health care professionals, on the management of cardiac arrhythmias in pregnant patients and in fetuses. This document covers general concepts related to arrhythmias, including both brady- and tachyarrhythmias, in both the patient and the fetus during pregnancy. Recommendations are provided for optimal approaches to diagnosis and evaluation of arrhythmias; selection of invasive and noninvasive options for treatment of arrhythmias; and disease- and patient-specific considerations when risk stratifying, diagnosing, and treating arrhythmias in pregnant patients and fetuses. Gaps in knowledge and new directions for future research are also identified.

[Prehospital perimortem cesarean section during cardiopulmonary resuscitation for traumatic cardiac arrest : Case report and lessons learned]

The following case report discusses the resuscitation of a pregnant woman in traumatic cardiac arrest after a fall from a height with consecutive resuscitative hysterotomy for maternal and fetal salvage. The report illustrates all lessons learned from critical appraisal amid new guideline recommendations and gives an overview of the published literature on the matter. Despite extensive resuscitation efforts, ultimately both the mother and the newborn were pronounced life extinct at the scene. Prehospital treatment of (traumatic) cardiac arrest in a pregnant patient as well as performing a perimortem cesarean section remain infrequent but challenging scenarios.

Cardiac Arrest in Special Populations

Best practices in cardiac arrest depend on continuous high-quality chest compressions, appropriate ventilatory management, early defibrillation of shockable rhythms, and identification and treatment of reversible causes. Although most patients can be treated according to highly vetted treatment guidelines, some special situations in cardiac arrest arise where additional skills and preparation can improve outcomes. Situations covered in this section involve cardiac arrest in context of electrical injuries, asthma, allergic reactions, pregnancy, trauma, electrolyte imbalances, toxic exposures, hypothermia, drowning, pulmonary embolism, and left ventricular assist devices.

Trauma in Pregnancy

Trauma is the leading cause of nonobstetric maternal death. Pregnant patients have a similar spectrum of traumatic injuries with a noted increase in interpersonal violence. A structured approach to trauma evaluation and management is recommended with several guidelines expanding on ATLS principles; however, evidence is limited. Optimal management requires understanding of physiologic changes in pregnancy, a team-based approach, and preparation for interventions that may including neonatal resuscitation. The principles of trauma management are the same in pregnancy with a systematic approach and initial maternal focused resuscitation..

Healthcare personnel self-assessed competence and knowledge following implementation of a new guideline on maternal resuscitation in Norway. A repeated measure study

Introduction

Cardiac arrest in pregnancy is a rare, yet extremely challenging condition to manage for all healthcare personnel involved. Knowledge deficits and poor resuscitation skills can affect outcomes in cardiac arrest in pregnancy, but research exploring healthcare personnel competence and knowledge about maternal resuscitation is limited.

Aims

The aim of this study was to explore (1) healthcare personnel self-assessed competence and knowledge about cardiopulmonary resuscitation (CPR) in pregnancy as well as perimortem caesarean section, before and after implementation of a new guideline, (2) whether there were any interprofessional differences in knowledge about maternal resuscitation, and (3) potential differences between different implementation strategies.

Research Methodology

The study had a prospective repeated measure implementation design, utilizing a questionnaire before and after implementation of a new guideline on maternal resuscitation after cardiac arrest.

Setting

All healthcare personnel potentially involved in CPR in six hospital wards, were invited to participate (n = 527). The guideline was implemented through either simulation, table-top discussions and/or an electronical learning course.

Results

In total, 251 (48%) participants responded to the pre-questionnaire, and 182 (35%) to the postquestionnaire. The need for education and training/simulation concerning maternal resuscitation were significantly lowered after implementation of the guideline, yet still the majority of respondents reported a high to medium need for education and training/simulation. Participants' self-assessed overall competence in maternal resuscitation increased significantly postimplementation. Regardless of professional background, knowledge about CPR and perimortem caesarean section increased significantly in most items in the questionnaire after implementation. Differences in level of knowledge based on implementation strategy was identified, but varied between items, and was therefore inconclusive.

Conclusion

This study adds knowledge about healthcare personnel self-assessed competence and knowledge about maternal resuscitation and perimortem caesarean section in pregnancy. Our findings indicate that there is still a need for more education and training in this rare incident.

Maternal collapse in pregnancy

Maternal collapse is a rare life-threatening event that can occur at any stage of pregnancy or up to 6 weeks postpartum. Prompt identification and timely intervention by a multidisciplinary team that includes an obstetrician, midwifery staff and an obstetric anaesthetist are essential to improve maternal and fetal outcomes. Standard adult resuscitation guidelines need to be followed with some modifications, taking into account the maternal-fetal physiology, which clinicians should be familiar with. During cardiac arrest, the emphasis is on advanced airway management, manual uterine displacement to relieve aortocaval compression and performing a resuscitative hysterotomy (peri-mortem caesarean delivery) swiftly in patients who are more than 20 weeks gestation to improve maternal survival. Annual multidisciplinary simulation training is recommended for all professionals involved in maternity care; this can improve teamwork, communication and emergency preparedness during maternal collapse.

Clinical decision analysis of elective delivery vs expectant management for pregnant individuals with COVID-19-related acute respiratory distress syndrome

BACKGROUND

Pregnant individuals are vulnerable to COVID-19-related acute respiratory distress syndrome. There is a lack of high-quality evidence on whether elective delivery or expectant management leads to better maternal and neonatal outcomes.

OBJECTIVE

This study aimed to determine whether elective delivery or expectant management are associated with higher quality-adjusted life expectancy for pregnant individuals with COVID-19-related acute respiratory distress syndrome and their neonates.

STUDY DESIGN

We performed a clinical decision analysis using a patient-level model in which we simulatedpregnant individuals and their unborn children. We used a patient-level model with parallel open-cohort structure, daily cycle length, continuous discounting, lifetime horizon, sensitivity analyses for key parameter values, and 1000 iterations for quantification of uncertainty. We simulated pregnant individuals at 32 weeks of gestation, invasively ventilated because of COVID-19-related acute respiratory distress syndrome. In the elective delivery strategy, pregnant individuals received immediate cesarean delivery. In the expectant management strategy, pregnancies continued until spontaneous labor or obstetrical decision to deliver. For both pregnant individuals and neonates, model outputs were hospital or perinatal survival, life expectancy, and quality-adjusted life expectancy denominated in years, summarized by the mean and 95% credible interval. Maternal utilities incorporated neonatal outcomes in accordance with best practices in perinatal decision analysis.

RESULTS

Model outputs for pregnant individuals were similar when comparing elective delivery at 32 weeks' gestation with expectant management, including hospital survival (87.1% vs 87.4%), life-years (difference, -0.1; 95% credible interval, -1.4 to 1.1), and quality-adjusted life expectancy denominated in years (difference, -0.1; 95% credible interval, -1.3 to 1.1). For neonates, elective delivery at 32 weeks' gestation was estimated to lead to a higher perinatal survival (98.4% vs 93.2%; difference, 5.2%; 95% credible interval, 3.5-7), similar life-years (difference, 0.9; 95% credible interval, -0.9 to 2.8), and higher quality-adjusted life expectancy denominated in years (difference, 1.3; 95% credible interval, 0.4-2.2). For pregnant individuals, elective delivery was not superior to expectant management across a range of scenarios between 28 and 34 weeks of gestation. Elective delivery in cases where intrauterine death or maternal mortality were more likely resulted in higher neonatal quality-adjusted life expectancy, as did elective delivery at 30 weeks' gestation (difference, 1.1 years; 95% credible interval, 0.1 - 2.1) despite higher long-term complications (4.3% vs 0.5%; difference, 3.7%; 95% credible interval, 2.4-5.1), and in cases where intrauterine death or maternal acute respiratory distress syndrome mortality were more likely.

CONCLUSION

The decision to pursue elective delivery vs expectant management in pregnant individuals with COVID-19-related acute respiratory distress syndrome should be guided by gestational age, risk of intrauterine death, and maternal acute respiratory distress syndrome severity. For the pregnant individual, elective delivery is comparable but not superior to expectant management for gestational ages from 28 to 34 weeks. For neonates, elective delivery was superior if gestational age was ≥30 weeks and if the rate of intrauterine death or maternal mortality risk were high. We recommend basing the decision for elective delivery vs expectant management in a pregnant individual with COVID-19-related acute respiratory distress syndrome on gestational age and likelihood of intrauterine or maternal death.

Perimortem caesarean section in COVID-19 era

Cardiac arrest in pregnancy is very rare. Various methods have been proposed to return spontaneous circulation and prevent mortality, such as Perimortem Caesarean Section (PMCS). Since 2019, the COVID-19 pandemic has added to the difficulty in decision making and performing PMCS. Infection prevention being a priority due to the rapid spreading of the virus could cause hesitation upon initiating an emergency procedure, especially PMCS. We have reviewed the issues impacting on basic and advanced life support in adults with suspected or confirmed COVID-19.

Spontaneous Pulmonary Embolism Leading to Sudden Cardiac Arrest and Perimortem C-Section in a 39-Week Parturient During Induction of Labor: A Case Report

We report the successful salvage of mother and baby after a perimortem cesarean delivery (PMCD) complicated by a 21-minute asystolic maternal cardiac arrest (MCA) that was precipitated by a pulmonary embolism during the early stages of induction of labor. With rapid PMCD, recovery of maternal quality of life is possible even after prolonged resuscitation.

Septic Shock and Cardiac Arrest in Obstetrics: A Practical Simplified Clinical View

Septic shock and cardiac arrest during pregnancy, despite being uncommon, carry a high mortality rate among pregnant individuals. Basic initial management strategies are fundamental to improve clinical outcomes; obstetricians and maternal-fetal medicine specialists need to be familiar with such interventions.

A modified Delphi approach to determine current treatment advances for the development of a resuscitation program for maternal cardiac arrest

OBJECTIVE

Maternal cardiac arrest is a rare and complex process requiring pregnancy-specific responses and techniques. The goals of this study were to (1) identify, evaluate, and determine the most current best practices to treat this patient population and (2) establish a standardized set of guidelines to serve as a foundation for a future educational simulation-based curriculum.

STUDY DESIGN

We used a three-step modified Delphi process to achieve consensus. Twenty-two healthcare experts from across North America agreed to participate in the expert panel. In round 1, 12 pregnancy-specific best practice statements were distributed to the expert panel. Panelists anonymously ranked these using a 7-point Likert scale and provided feedback. Round 2 consisted of a face-to-face consensus meeting where statements that had not already achieved consensus were discussed and then subsequently voted upon by the panelists.

RESULTS

Through two rounds, we achieved consensus on nine evidence-based pregnancy-specific techniques to optimize response to maternal cardiac arrest. Round one resulted in one of the 12 best practice statements achieving consensus. Round two resulted in six of the remaining 12 gaining consensus. Best practice techniques involved use of point-of care ultrasound, resuscitative cesarean delivery, cardiopulmonary resuscitation techniques, and the use of extracorporeal cardiopulmonary resuscitation.

CONCLUSION

The results of this study provide the foundation to develop an optimal, long-term strategy to treat cardiac arrest in pregnancy. We propose these nine priorities for standard practice, curricula, and guidelines to treat maternal cardiac arrest and hope they serve as a foundation for a future educational curriculum.

An Inexpensive, High-Fidelity Resuscitative Hysterotomy (RH) Model With Hemorrhage Capability

Resuscitative hysterotomy (RH) is a rare, time-sensitive, invasive procedure that can be frightening for emergency physicians and yet potentially life-saving for fetus and mother. Several low-cost RH task trainers have been described in the literature. We set out to construct a model using improved synthetic materials for the uterine and abdominal wall and to devise hemorrhage capability. The primary aim of this study was to evaluate the model’s perceived usefulness of its features. Secondarily, we wished to assess the confidence of emergency medicine (EM) residents before and after performing a RH using our task trainer in a simulated environment.

We constructed an inexpensive task trainer that can function both as a table-top model (TTM) and be adapted to a high-fidelity simulator. We created the abdominal wall and uterus from polyurethane carpet padding, subcutaneous fat from upholstery foam, fascia from synthetic chamois, and blood vessels from IV tubing and angio-catheters. We utilized the task trainer during our monthly EM residency simulation conference. After completing a simulation of a gravid female in cardiac arrest requiring a RH on a high-fidelity simulator adaptated model (HFSAM), residents repeated the procedure during debriefing on a TTM. Residents then completed anonymous paper surveys in which they rated aspects of the RH model and their procedural confidence on a 10-point Likert scale.

20 EM residents took part in the RH simulation scenario followed by a TTM demonstration. All (100%) residents completed the survey. 11 (55%) of the residents performed a RH on either the HFSAM or the TTM while the others assisted. The residents rated the overall educational value of the training event as very high (mean 9.8 (SD 0.68)). Both the TTM (mean 8.9 (SD 1.15)) and HFSAM (mean 8.7 (SD 1.29)) were similarly rated as highly realistic. Before the simulation session, residents rated their confidence in performing a RH as low (mean 4.0 (SD 2.62)). After the session, they were much more confident in their ability to perform a RH (mean 7.9 (SD 1.48); P<0.001). Most residents rated bleeding as very important to the utility of a RH model (mean 8.6 (SD 1.74)).

We demonstrate an inexpensive but realistic RH task trainer that can be used as a stand-alone model or adapted to a high-fidelity simulator. A single simulation using the TTM and the HFSAM lead to increased resident confidence in their ability to perform a RH.

[Cardiopulmonary resuscitation of pregnant patients in the rescue service]

Cardiopulmonary resuscitation of a pregnant patient is a rarity in prehospital emergency medicine and an extraordinary challenge for the emergency team. Besides modifications to emergency medical procedures due to physiological changes during pregnancy, specific reversible causes must be considered and psychosocial difficulties must be managed. This article aims to present a standard operating procedure for this special situation. In these circumstances the basics of crew resource management (CRM) are of special interest for the emergency team and are therefore mentioned in this article.

Impact of foeto-maternal resuscitation and perimortem caesarean section simulation training: An opinion survey of healthcare participants

Background:

The incidence of maternal cardiac arrest is rising in recent years. Medical staff generally lack the experience of performing resuscitation on pregnant patients. Maternal cardiac arrest and perimortem caesarean section simulation training was newly introduced in the Advanced Life Support in Obstetrics provider courses in Hong Kong since April 2021.

Objective:

To evaluate the course participants’ opinions on maternal cardiac arrest simulation training.

Methods:

A questionnaire survey was conducted for all participants in the Advanced Life Support in Obstetrics provider course in April 2021 to assess their opinions on the usefulness of this training.

Results:

There were four Advanced Life Support in Obstetrics provider courses in April 2021 with 36 participants in each course, and 137 questionnaires were received at the end of the course. The response rate was 137/144 (95.1%). After excluding the questionnaires with incomplete information, 134 questionnaires were included for final analysis. Almost all of the participants agreed that the maternal cardiac arrest simulation training could help them in their work (97.8%), could improve their knowledge and skill (98.5%) and could improve team training and co-ordination (97.0%). The majority of them (97.0%) felt more confident in managing maternal cardiac arrest after the training, and 97.8% of participants felt that the perimortem caesarean section model was useful for training. Around 80% of the participants would recommend this course to their colleagues. There were no significant differences in opinions on the usefulness of this training among participants with regard to their specialty, whether they were doctors or nurses, their years of experience and the specific hospital settings.

Conclusions:

Maternal cardiac arrest simulation training was highly valued by all levels of obstetric, emergency medicine and anaesthesia staff in both public and private hospitals.

A ten-year retrospective review of maternal cardiac arrest: Incidence, characteristics, causes, and outcomes in a tertiary-care hospital in a developing country

OBJECTIVE

Maternal cardiac arrest is rare. We retrospectively reviewed and reported (1) the incidence of maternal cardiac arrests during admissions for delivery; (2) the characteristics and causes of cardiac arrest; and (3) the mortality rate and outcomes in a referral, single-university, teaching hospital in Thailand.

MATERIALS AND METHODS

Data on 23 cardiac arrests during admissions for delivery in the decade January 2006-December 2015 were retrospectively chart-reviewed. Patients with gestational ages under 24 weeks or cardiac arrests and death occurring before hospital arrival were excluded. The clinical characteristics of the arrests and outcomes were collected.

RESULTS

Of 89,368 deliveries during the decade, 23 women suffered cardiac arrest (incidence, 1:3885), with 3 of those arrests occurring before delivery (incidence, 1:29,789). One patient underwent a perimortem cesarean delivery in the operating theatre. The most common reasons for the arrests were hypertension during pregnancy and cardiovascular causes (30.4% and 21.7%, respectively). Amniotic fluid embolisms were suspected for 2 patients (8.7%) with unidentified causes. The incidence of maternal deaths in peripartum cardiac arrests was 20/23, representing 86.9% (95% CI, 67.9-95.5) or 1:4468 of deliveries. Three patients suffering cardiac arrests after delivery survived to discharge.

CONCLUSIONS

We found a high maternal mortality rate following cardiac arrests during hospitalization for delivery. To decrease the incidence of arrests during the peripartum period and diminish the maternal mortality rate, identification of the causes and precipitating factors is vital. High-risk pregnant women require multidisciplinary care to improve the survival-to-discharge rate.

Emergency Resources in Obstetrics

Utilization of emergency resources in obstetrics can help to optimize health care providers' care to pregnant and postpartum patients. There is a vast array of resources with various accessibility modalities that can be used before, during, and/or after an obstetric emergency. These resources can also be included as teaching material to increase knowledge and awareness with the aim to reduce maternal morbidity and mortality and improve patient outcomes.

Cardiopulmonary resuscitation in special circumstances

Cardiopulmonary resuscitation prioritises treatment for cardiac arrests from a primary cardiac cause, which make up the majority of treated cardiac arrests. Early chest compressions and, when indicated, a defibrillation shock from a bystander give the best chance of survival with a good neurological status. Cardiac arrest can also be caused by special circumstances, such as asphyxia, trauma, pulmonary embolism, accidental hypothermia, anaphylaxis, or COVID-19, and during pregnancy or perioperatively. Cardiac arrests in these circumstances represent an increasing proportion of all treated cardiac arrests, often have a preventable cause, and require additional interventions to correct a reversible cause during resuscitation. The evidence for treating these conditions is mostly of low or very low certainty and further studies are needed. Irrespective of the cause, treatments for cardiac arrest are time sensitive and most effective when given early-every minute counts.

A Detailed Review of Critical Care Considerations for the Pregnant Cardiac Patient

Maternal cardiovascular disease is a leading cause of maternal death worldwide and recently, maternal mortality has increased secondary to cardiovascular causes. Maternal admissions to critical care encompass 1%-2% of all critical care admissions, and although not common, the management of the critically ill pregnant patient is complex. Caring for the critically ill pregnant cardiac patient requires integration of pregnancy-associated physiologic changes, understanding pathophysiologic disease states unique to pregnancy, and a multidisciplinary approach to timing around delivery as well as antenatal and postpartum care. Herein we describe cardiorespiratory changes that occur during pregnancy and the differential diagnosis for cardiorespiratory failure in pregnancy. Cardiorespiratory diseases that are either associated or exacerbated by pregnancy are highlighted with emphasis on perturbations secondary to pregnancy and appropriate management strategies. Finally, we describe general management of the pregnant cardiac patient admitted to critical care.

Singapore Advanced Cardiac Life Support Guidelines 2021

Advanced cardiac life support (ACLS) emphasises the use of advanced airway management and ventilation, circulatory support and the appropriate use of drugs in resuscitation, as well as the identification of reversible causes of cardiac arrest. Extracorporeal cardiopulmonary resuscitation and organ donation, as well as special circumstances including drowning, pulmonary embolism and pregnancy are addressed. Resuscitation does not end with ACLS but must continue in post-resuscitation care. ACLS also covers the recognition and management of unstable pre-arrest tachy- and bradydysrhythmias that may deteriorate further.

[Cardiac arrest under special circumstances]

These guidelines of the European Resuscitation Council (ERC) Cardiac Arrest under Special Circumstances are based on the 2020 International Consensus on Cardiopulmonary Resuscitation Science with Treatment Recommendations. This section provides guidelines on the modifications required for basic and advanced life support for the prevention and treatment of cardiac arrest under special circumstances; in particular, specific causes (hypoxia, trauma, anaphylaxis, sepsis, hypo-/hyperkalaemia and other electrolyte disorders, hypothermia, avalanche, hyperthermia and malignant hyperthermia, pulmonary embolism, coronary thrombosis, cardiac tamponade, tension pneumothorax, toxic agents), specific settings (operating room, cardiac surgery, cardiac catheterization laboratory, dialysis unit, dental clinics, transportation [in-flight, cruise ships], sport, drowning, mass casualty incidents), and specific patient groups (asthma and chronic obstructive pulmonary disease, neurological disease, morbid obesity, pregnancy).

European Resuscitation Council Guidelines 2021: Cardiac arrest in special circumstances

These European Resuscitation Council (ERC) Cardiac Arrest in Special Circumstances guidelines are based on the 2020 International Consensus on Cardiopulmonary Resuscitation Science with Treatment Recommendations. This section provides guidelines on the modifications required to basic and advanced life support for the prevention and treatment of cardiac arrest in special circumstances; specifically special causes (hypoxia, trauma, anaphylaxis, sepsis, hypo/hyperkalaemia and other electrolyte disorders, hypothermia, avalanche, hyperthermia and malignant hyperthermia, pulmonary embolism, coronary thrombosis, cardiac tamponade, tension pneumothorax, toxic agents), special settings (operating room, cardiac surgery, catheter laboratory, dialysis unit, dental clinics, transportation (in-flight, cruise ships), sport, drowning, mass casualty incidents), and special patient groups (asthma and COPD, neurological disease, obesity, pregnancy).

Maternal cardiac arrest: a retrospective analysis

OBJECTIVES

To describe the characteristics and factors which may influence the maternal outcomes of maternal cardiac arrest (MCA).

DESIGN

Retrospective analysis of cases.

SETTING

China.

POPULATION OR SAMPLE

A total of 61 MCA patients admitted or transferred to The Third Affiliated Hospital of Guangzhou Medical University from January 2000 to December 2019.

METHODS

Clinical data for MCA were analysed retrospectively. The indicators included maternal age; BMI; gestational age; antenatal examination; income; MCA cause and place; cardiopulmonary resuscitation (CPR); mode of delivery; maternal prognosis; and neonatal outcome.

MAIN OUTCOME MEASURES

The impact of case characteristics on maternal prognosis of MCA.

RESULTS

The hospital received 61 patients with MCA, 36 of whom died (mortality 59.0%, 95% CI 46.3-71.7%). MCA was predominantly caused by treatable complications. Those who died were more likely to have collapsed in the ICU.

CONCLUSIONS

Regular antenatal examination and early intervention can reduce the incidence of adverse pregnancy outcomes. The location of MCA occurred may be related to maternal prognosis. The leading causes of MCA were postpartum haemorrhage and amniotic fluid embolism.

TWEETABLE ABSTRACT

A retrospective analysis describes the correlation between case characteristics of MCA and maternal outcomes.

Development and validation of a questionnaire to assess healthcare personnel competence in cardiac arrest and resuscitation in pregnancy

BACKGROUND

Cardiac arrest is rare in pregnancy, and up-to date competence can be difficult to assess and maintain. The objective of this study was to develop and validate a questionnaire to assess healthcare personnel experiences, self-assessed competence and perception of role and resposibility related to cardiac arrest and cardio-pulmonary resuscitation (CPR) in pregnancy.

METHODS

The study had a cross-sectional design, developing and validating a questionnaire: the Competence in cardiac arrest and CPR in pregnancy (ComCA-P). Development and validation of the ComCA-P was conducted in three stages: 1) Literature review and expert group panel inputs, 2) a pilot study and 3) a cross-sectional questionnaire study. In stage one, the ComCA-P was developed over several iterations between the researchers, including inputs from an expert group panel consisting of highly competent professionals (n = 11). In stage two, the questionnaire was piloted in a group of healthcare personnel with relevant competence (n = 16). The ComCA-P was then used in a baseline study including healthcare personnel potentially involved in CPR in pregnancy (n = 527) in six hospital wards. Based on these data, internal consistency, intra-class correlations, and confirmatory factor analysis were utilized to validate the questionnaire.

RESULTS

The expert group and pilot study participants evaluated the appropriateness, relevance and accuracy to be high. Formulation of the items was considered appropriate, with no difficulties identified related to content- or face validity. Cronbach's alpha was 0.8 on the thematic area self-assessment, and 0.73 on the theoretical knowledge area of the ComCA-P. On both the self-assessed competence items and the teoretical knowledge items, Kaiser-Meyer-Olkin was 0.8. Moreover, the Bertletts' test of sphericity was greater than the critical value for chi-square, and significant (p < .0001).

CONCLUSIONS

Findings indicate that the ComCA-P is a valid questionnaire that can be used to assess healthcare personnel competence in cardiac arrest and resuscitation in pregnancy.

Massive pulmonary embolism in pregnancy: intra-arrest thrombolysis and resuscitative hysterotomy

Massive pulmonary embolism (PE) is a leading cause of maternal death and may require intra-arrest thrombolysis as well as resuscitative hysterotomy. The case presented is a primigravida in her mid-30s at 28 weeks gestation. The patient presented to the emergency department after out-of-hospital cardiac arrest. Return of spontaneous circulation (ROSC) was achieved but not sustained. Episodic cardiopulmonary resuscitation with epinephrine boluses was required. Resuscitative hysterotomy was performed intra-arrest. Echocardiography revealed a dilated right heart consistent with massive PE and thrombolysis was administered. ROSC was obtained thereafter and output was sustained. Subsequent CT brain revealed irreversible hypoxic injury. Treatment was withdrawn with the support of family. Postmortem examination confirmed massive PE. Thrombolysis can restore and improve cardiovascular status in cardiac arrest caused by massive PE. Thrombolysis is not contraindicated in maternal resuscitation where resuscitative hysterotomy may also be required.

Prehospital Perimortem Caesarean Section - A Survivor

Cardiac arrest in pregnancy is rare. It has a reported incidence of approximately 1 in 30000 pregnancies worldwide and occurs prehospitally with rates of around 3 in every 100000 live births within the developed world. The management of maternal cardiac arrest is complicated by the anatomical and physiological changes of pregnancy, its rarity and clinician unfamiliarity. The presentation and the prehospital environment can make for an incredibly challenging, stressful and highly emotive scene. One aspect of maternal cardiac arrest management is the perimortem cesarean section, a surgical procedure that is potentially lifesaving for both mother and child. Although rarely reported in the field it is possible to successfully perform the procedure. This report details the emergent prehospital treatment of a 41-year-old woman pregnant with her first child of 30 weeks gestation. It describes a case of maternal cardiac arrest, her resuscitation and the undertaking of a prehospital perimortem cesarean section resulting in a neurologically intact infant survivor.

Maternal cardiac arrest

PURPOSE OF REVIEW

The review is intended to serve as a practical clinical aid for the clinician called to maternal cardiac arrest.

RECENT FINDINGS

Anesthesia complications comprise an important cause of maternal cardiac arrest in developed countries Also predominant are hemorrhage and infections. Recent in-depth reports highlight fractionated care for pregnant women with cardiac and also probably neurological comorbidities. Pathology reports reveal a prevalence of thromboembolic phenomena that is higher than previously assumed but still rare. These are accompanied by particularly high mortality rates. The presenting rhythms of cardiac arrest which differ from most cardiac arrest populations, suggest the need for further in-depth investigation of both the causes and management of these cases. Despite these, outcomes are far better than those of most arrests. Key differences in treatment include are consideration of early airway management and possible medication complications. Pulseless electrical activity and VF should always alert to the possibility of hemorrhage. Echocardiography can diagnose thromboembolism. Also different are the need for Left uterine displacement and early delivery within after 4-5 min of initiation of resuscitation effort in cases with suspected compromise of the venous return or a poor likelihood of a good maternal outcome.

SUMMARY

Maternal cardiac arrest should be managed similarly to other adult cardiac arrests. At the same time its unique reversible causes require a different form of thought regarding diagnosis and treatment during the code.

Aortocaval compression resulting in sudden loss of consciousness and severe bradycardia and hypotension during cesarean section in a patient with subvalvular aortic stenosis

Background

Maternal cardiac arrest during cesarean section (CS) is an extremely rare but devastating complication. Preventing emergency events from developing into maternal cardiac arrest is one of the most challenging clinical scenarios.

Case presentation

A 35-year-old pregnant woman with subvalvular aortic stenosis who was scheduled for elective CS under epidural anesthesia, and experienced devastating supine hypotensive syndrome, but was successfully resuscitated after delivery.

Conclusions

The performance of tilt position strictly or high-quality continue manual left uterine displacement (LUD) should be performed until the fetus is delivered, otherwise timely delivery of the fetus may be the best way to optimize the deadly condition.

Live birth after perimortem cesarean delivery in a 36-year-old out-of-hospital cardiac arrest nulliparous woman

OBJECTIVE

The aim of this study is to share a valuable experience of perimortem Cesarean delivery (PMCD) when no signs of spontaneous circulation were detected after 4 min of resuscitation. The time interval between maternal cardiac arrest and neonatal delivery was evaluated and reviewed.

CASE REPORT

We present the case of an out-of-hospital cardiac arrest (OHCA) in a nulliparous woman who survived a car accident with only seatbelt injuries. The term infant was delivered by PMCD at our emergency department at least 43 min after maternal cardiac arrest. The mother only had concussion and was healthy at the time of discharge. The infant survived but had moderate neurological growth impairment (cerebral palsy) at the age of 7 months.

CONCLUSION

Contrary to previous studies and case reports, maternal and neonatal outcomes seem to be better when performing PMCD within 10 min. Multidisciplinary teamwork is the key for optimal outcomes in such situations.

Resuscitation of the Pregnant Patient

Many health care providers lack familiarity with maternal physiologic changes and the distinctive underlying etiology of cardiac arrest in pregnancy. Knowledge of what changes are expected in pregnancy and an understanding of how to adapt clinical practice is essential for the care of the pregnant woman in the emergency department. Amniotic fluid embolism should be recognized as a rare cause of cardiac arrest in pregnancy, characterized by the triad of cardiovascular collapse, hypoxic respiratory failure, and coagulopathy. Cardiopulmonary resuscitation should follow standard AHA ACLS guidelines. Resuscitative hysterotomy may be attempted to restore perfusion to both mother and fetus.

Update: Focus in-hospital maternal cardiac arrest

The incidence of maternal cardiac arrest ranges from 1/55,000 to 1/12,000 births. It is due most frequently to cardiovascular, hemorrhagic, and anesthesia-related causes, as well as to amniotic fluid embolism. The basic principles of resuscitation remain applicable in this situation, but the physiological modifications of pregnancy must be taken into account, in particular, the aortocaval compression syndrome. After 24 weeks of gestation, a salvage cesarean delivery must be performed immediately, without transfer to the operating room, if resuscitation maneuvers have failed 4 min after arrest, because this interval conditions the mother's neurological prognosis and improves neonatal survival.

Maternal out-of-hospital cardiac arrest: A retrospective observational study

AIM

Out-of-hospital cardiac arrests (OHCAs) in pregnant women are rare events. In this study, we aimed to describe a cohort of pregnant women who experienced OHCAs in a large urban area, and received treatment by the prehospital teams in a two-tiered emergency response system.

METHODS

This retrospective study included pregnant women over 18 years of age who experienced OHCAs. The analysed variables included maternal age, gestational age, variables specific to the rescue system, number of shocks delivered by an automatic external defibrillator, and rates of maternal and neonatal survival.

RESULTS

Over the 5-year study period, 19,515 OHCAs occurred, 16 of which were in pregnant women. These 16 patients had a median age of 31 years [interquartile range (IQR): 28-35] and a median gestational age of 20 weeks [IQR: 10-33]. Three patients (18.8%) had an initial rhythm of ventricular fibrillation. Only one patient underwent thrombolysis. Of the 16 patients, 6 (38%) died after resuscitation on the scene. The remaining 10 were transported to the hospital, of whom 5 achieved circulation through a mechanical CPR device. Only 2 patients were alive 30days after OHCA.

CONCLUSIONS

Over half of the pregnant women who experienced OHCA were at least 20 weeks pregnant. Analysis of the prehospital medical data suggests that the current recommendations are difficult to apply in an out-of-hospital environment. Specific recommendations for this situation must be developed.

A novel biosimulation task trainer for the deliberate practice of resuscitative hysterotomy

Resuscitative hysterotomy is a daunting and rarely performed procedure in the emergency department (ED). Given the paucity of clinical exposure to this intervention, resuscitative hysterotomy is an ideal opportunity for simulation-mediated deliberate practice. The authors propose a novel training program using a homegrown, realistic, simulation device as a means to practice resuscitative hysterotomy. Two high-fidelity, tissue-based task-trainer models were constructed and tested on a convenience sample of 14 emergency medicine (EM) residents. The simulated human placenta, bladder, amniotic sac, and uterus were constructed through the use of porcine skin, porcine stomach, transparent plastic bag, Foley tubing, and squid mantle, all secured with nylon sutures. A Gaumard S500 Articulating Newborn was inserted in the simulated uterus, and the entire model was placed into a Gaumard S500 Childbirth Simulator. Each model required less than 1 h for assembly. Emergent hysterotomy was first demonstrated by an EM faculty facilitator, followed by hands-on deliberate practice. Formal feedback on the learners' self-reported confidence and satisfaction levels was solicited at the end of the workshop through a survey previously cited for use with a low-fidelity resuscitative hysterotomy. Quantitative evaluation of the simulated training session was extracted through a 5-item questionnaire using a 5-point Likert-type scale (i.e., from 1, strongly disagree, to 5, strongly agree). Item scores were added for a cumulative total score, with a possible maximum score of 25 and minimum score of 5. Responses were overwhelmingly positive [24.13 (± 1.36)]. Qualitative feedback was extracted from the survey through open-ended questions; these responses highlighted learners' appreciation for hands-on practice and the development of a novel, tissue-based simulation task trainer. All participants recommended the training session be available to future learners. Resuscitative hysterotomy is a high-stakes, low-frequency procedure that demands provider practice and confidence. Our hybrid, tissue-based hysterotomy model represents a feasible opportunity for training. The model is cost conscious, easily reproducible, and portable and allows for ample deliberate practice.

Utility and limitations of perimortem cesarean section: A nationwide survey in Japan

AIM

Perimortem cesarean section (PCS) is a procedure performed as part of cardiopulmonary resuscitation (CPR). This study aims to clarify maternal and neonatal prognosis and establish PCS's utility and limitations.

METHODS

We sent structured questionnaires to obstetrics facilities regarding the cases of PCS performed in Japan between April 2010 and April 2015. Receiver operating characteristic (ROC) curve was used to determine the optimal cut-off values of the time from cardiopulmonary arrest (CPA) to return of spontaneous circulation to predict the onset of disseminated intravascular coagulation (DIC).

RESULTS

PCS was performed for 18 patients. Out of 18 patients, 12 were resuscitated. The women who were discharged without major sequelae (n = 6) were compared with the non-discharged women who were dead or in persistent vegetative state (n = 12), and median interval time from arrest to PCS was significantly shorter in the former group (P = 0.002). Median interval time from CPA to PCS in the cases in which the neonates survived without major morbidities was significantly shorter than that in the cases of neonatal death and hypoxic encephalopathy (P = 0.01). DIC was observed in 8/9 (89%) patients whose resuscitation took more than 20 min from the diagnosis of CPA. Percutaneous cardiopulmonary support (PCPS) was introduced in 4/9 patients. However, more cases with uncontrolled bleeding, possibly caused by a sudden increase in blood flow and DIC after resuscitation, were observed in the PCPS group compared to the non-PCPS group.

CONCLUSION

PCS can be an effective CPR procedure. However, if PCS is not performed within 20 min from CPA, starting PCPS before PCS is an option.

Incidence, outcomes and guideline compliance of out-of-hospital maternal cardiac arrest resuscitations: A population-based cohort study

BACKGROUND

Incidence and survival rates after cardiac arrest among pregnant women are reported for in-hospital cardiac arrests; the incidence and outcomes of maternal out-of-hospital cardiac arrest (OHCA) are unknown. Current cardiopulmonary resuscitation guidelines contain recommendations specific to this population; compliance with these has not been investigated.

OBJECTIVE

To report maternal OHCA incidence, outcomes, and compliance with recommended treatment guidelines.

METHODS

A population-based cohort study of consecutive maternal OHCAs from 2010 to 2014. Census data of all women of childbearing age provided the comparison. Resuscitation performance was measured against the 2010 American Heart Association (AHA) Guidelines.

RESULTS

Six maternal OHCAs were identified among 1085 OHCAs occurring in females of child bearing age (15-49) years; Incidence 1.71 per 100,000 pregnant women (95% CI 0.21 to 6.18) vs. 20.18 OHCAs per 100,000 females of child bearing age (95% CI, 18 to 22.62) p < 0.0001. Survival to hospital discharge was 16.7% (95% CI 3.0, 56.4%) after maternal OHCA vs. 6.8% (95% CI 5.4, 8.4) p < 0.0001 after OHCA in all females of childbearing age, and neonatal survival was 33.3% (95% CI 9.7, 70%). CPR quality metric compliance averaged 83% (range 75% to 100%); compliance with pregnancy-specific resuscitation guidelines ranged from 0% (uterine displacement) to 100% (intravenous line insertion above diaphragm and prehospital maternal team activation).

CONCLUSION

The incidence of maternal OHCA was 1.71:100,000. Survival was higher after maternal OHCA than after OHCA of non-pregnant females of childbearing age. Pregnancy-specific guideline compliance was low suggesting a need for training and better documentation to improve outcomes in these rare events.

Peri-mortem caesarean section after traumatic arrest: Crisis resource management

Peri-mortem caesarean section (PMCS) is a very rare procedure performed to improve the chances of survival for both mother and fetus following cardiorespiratory arrest. Non-obstetricians including Emergency Physicians (EPs) are often called upon to perform this procedure under challenging and suboptimal circumstances. We reported a case of PMCS performed timely after traumatic cardiorespiratory arrest that resulted in fetal survival. A 25-year-old primigravida female and six-month pregnant presented to the Emergency Department (ED) of an adult tertiary hospital. She experienced traumatic cardiorespiratory arrest for nearly 27 min following a high-speed motor vehicle crash. Upon ED arrival, she was in pulseless electrical activity. She was immediately intubated with continuation of cardiopulmonary resuscitation. She received bilateral tube thoracostomies as well as intravenous (IV) transfusion of blood products, adrenaline and tranexamic acid. Her fundal height was two centimeters above the umbilicus on palpation. The EP performed a PMCS via a midline laparotomy 3-4 min upon ED arrival. The baby was bradycardic and cyanosed with no spontaneous respiration at birth and was resuscitated by a second EP. She was intubated and the EP gained IV access using a cannula introduced into the umbilical vein. Neonatal hypothermia was avoided using cling wrap. The baby was transported to a nearby neonatal intensive unit. She survived and is currently one year old. The mother, however, did not respond to our resuscitation and succumbed to her multiple injuries. We reviewed the limited literature regarding this potentially life-saving emergency procedure and highlighted the challenges facing our resuscitation team.

Characteristics and outcomes of maternal cardiac arrest: A descriptive analysis of Get with the guidelines data

BACKGROUND

Maternal mortality has risen in the United States in the twenty-first century, yet large cohort data of maternal cardiac arrest (MCA) are limited.

OBJECTIVE

We sought to describe contemporary characteristics and outcomes of in-hospital MCA.

METHODS

We queried the American Heart Association's Get with the Guidelines Resuscitation voluntary registry from 2000 to 2016 to identify cases of maternal cardiac arrest. All index cardiac arrests occurring in women aged 18-50 with a patient illness category designated as obstetric or location of arrest occurring in a delivery suite were included. Institutional review deemed that this research was exempt from ethical approval.

RESULTS

A total of 462 index events met criteria for MCA, with a mean age of 31 ± 7 years and a racial distribution of: 49.4% White, 35.3% Black and 15.3% Other/Unknown. While 32% had no pre-existing conditions or physiologic disorders, respiratory insufficiency (36.1%) and hypotension/hypoperfusion (33.3%) were the most common antecedent conditions. In most cases, the first documented pulseless rhythm was non-shockable; pulseless electrical activity (50.8%) or asystole (25.6%). Only 11.7% presented with a shockable rhythm; ventricular fibrillation (6.5%) or pulseless ventricular tachycardia (5.2%) while the initial pulseless rhythm was unknown in 11.9% of cases. Return of spontaneous circulation occurred in 73.6% but 68 (14.7%) had more than one arrest. The rate of survival to discharge was 40.7% overall; 37.3% with non-shockable rhythms, 33% with shockable rhythms and 64.3% with unknown presenting rhythms.

CONCLUSIONS

Maternal survival at hospital discharge in this cohort was less than 50%, lower than rates reported in other epidemiological datasets. More research is required in maternal resuscitation science and translational medicine to continue to improve outcomes and understand maternal mortality.