Obstetric Emergencies

25
Obstetric Emergencies


Sara Paterson‐Brown1 and Timothy J. Draycott2


1 Queen Charlotte’s Hospital Imperial NHS Trust, London, UK


2 Department of Women’s Health, Southmead Hospital, Bristol, UK


This chapter details how to minimize the risks as well as the consequences of an obsteric emergency and how to manage various scenarios. We then discuss aspects of emergency skills training before including some algorithms: these are consistent with other more succinct algorithms but contain more detail as this is a reference textbook and additional information can be assimilated rather than just reproducing the ‘checklist’ type flow diagrams.


General principles for minimizing the risk of an emergency occurring


Promote good antenatal health


Good general health and a supportive home environment promote good health during pregnancy. The UK Confidential Enquiries into Maternal Deaths over many triennia [13] remind us of the increased risks not only of those with pre‐existing disease, including mental illness and obesity, but also of socially excluded and vulnerable women including immigrant women, those abusing substances, and those in abusive relationships. Good antenatal care is paramount in promoting health: women should be screened for a variety of risk factors and any problems that are identified should be acted on [4]. We know from the confidential enquiries over the years that we sometimes fail to recognize, communicate or act on risk factors which are apparent in the antenatal period. This makes it even more important, when considering intrapartum care, to make every effort to review a woman’s antenatal health to identify any such risks, and pay heed to any instructions made in the antenatal period.


Organized intrapartum care


Poor teamwork is directly associated with preventable morbidity and mortality for mothers and babies. The senior sister in charge and the senior obstetrician on the delivery suite should work together as a team to coordinate clinical activity. It is worthy of mention that when some people are in charge of a delivery suite, no matter how busy it is, things are calm and in control, while at other times even a quiet day can feel hectic. The skills required to coordinate workload and staffing are multiple and often acquired over years, but if you recognize either of the above characteristics in those you work with, take a moment or two to try to define what they are doing differently and try to emulate the one and avoid features of the other.


Triage


The principles behind effective triage have hinged on the ABC approach to prioritizing casualties according to whether they have an airway (A) problem (which can lead to death within minutes if left untreated) through difficulties with breathing (B) to circulatory disorders (C). Although this can also be useful in obstetrics, it does not address the fact that obstetricians have to prioritize between two patients: the mother and the baby. Indeed there is little written about obstetric triage [5,6] and how to fit the fetus (F) into the equation. Clearly it is not as easy as ABCF and emergency care to save a baby may take priority over a less than life‐threatening maternal condition. However, it is true to say that in most societies the life of the mother is given priority over that of an unborn baby and, most importantly, the fetus is best treated by adequate, rapid and effective resuscitation or stabilization of the mother anyway [5].


General principles for minimizing adverse consequences resulting from an emergency


If risk factors have been identified, preparations can be made to deal with the anticipated problem and staff should be informed, briefed and their roles defined. It is not uncommon that when such problems are prepared for, everything goes smoothly: this does not mean that staff are over‐cautious; it means they did their job well. Sadly, things do not always go smoothly, or an unexpected emergency occurs, and in such situations there are some features of general care which are important:


Communication and team working


A recent review of teamworking in maternity care [7] identified that good team communication, coordination and leadership were all evident in the best functioning teams. In one study of simulated eclampsia [8], more efficient teams were likely to have stated (recognized and verbally declared) the emergency (eclampsia) earlier, using closed‐loop communication (task clearly and loudly delegated, accepted, executed and completion acknowledged).


Integrating and teaching these simple team behaviours in clinical drills appears to be clinically effective [9]. This has been reiterated in a US study, which reported a statistically significant and persistent improvement of 37% in perinatal morbidity for the hospital exposed to a programme combining team training and clinical drills, whereas there were no improvements in the hospital exposed to team training only, or the control.


Good leadership is often invoked by reports, but can be nebulous in practice. Recent studies have demonstrated that leadership may best be established by the person who has the most experience of the emergency [10] and leadership may be more effective when the leader knows all the members of the multiprofessional maternity team and their relevant roles – before the emergency happens – from previous training together or from handover. Once again the leader should be mindful of the same three components of the situation as the rest of the team (team, situation, patient focus): establish the setting (using SBAR, i.e. situation, background, assessment, recommendation), allocate critical tasks with closed loops (directed–acknowledged–confirmed) and, if necessary, pass leadership to team members who are more experienced for the specific emergency at hand [11].


Women and their families also want similar information in an emergency. In recounted experiences, companions often informed women of the situation and the aims of treatment because they had heard loud and clear messages about the cause of the emergency, the condition of the baby, and the aims of immediate and ultimate management [11].


Local multiprofessional training for all staff annually, with teamwork training integrated into the clinical training, appears to be the most effective method of improving teamwork.


Documentation


This has already been mentioned briefly, but in all emergencies it helps to have someone looking at the clock, holding pen and paper, who is responsible for documenting the important facts as they happen. Remember that if, as is often the case, this person is fairly junior, he or she may not understand exactly what is going on and may fail to document key activity, and therefore it is imperative that senior members of the team ensure that all essential information is communicated. Once the emergency is over, notes should be written carefully and comprehensively and signed legibly. This is the best time to account for what has happened, and any relevant diagnosis, follow‐up care plan and prognosis for future pregnancies should be spelt out clearly whenever possible at this stage.


Risk management


After the emergency is over, reviewing the event with staff is hugely appreciated and very important: this is usually multidisciplinary but will sometimes be in small groups. Healthcare assistants and porters may need this support too and should not be forgotten. If everything went well, everyone should be congratulated; if some things were less than perfect, discussing why the difficulties were encountered and what might make things easier/work better another time is often helpful. This is a time for positive critical reflection; any negative feedback can wait and be dealt with privately.


Duty of candour


If the event has resulted in harm to the patients (woman/baby), then even if care was exemplary a senior doctor should speak personally to her and/or her partner/relative to express regret that the incident occurred and empathy for the current situation or outcome, and explain that such cases are reviewed to check everything was done that should have been and in a timely manor. Such dialogue should be recorded together with an offer to provide feedback to the patient/family should they so wish. This transparency and heightened communication and caring approach is directly driven from the NHS Litigation Authority and the Care Quality Commission with a statutory duty of candour for healthcare providers to comply since 2015 [12].


Emergency training


Over the last two decades the reduced duration of junior doctors’ training, combined with the dramatic cuts in their working hours, it is unsurprising that their clinical experience of obstetric emergencies is much less than that of their predecessors. They rely increasingly on training away from the bedside and there is no doubt that improving training for intrapartum emergencies is at least part of the potential solution to improving outcomes in the UK and further afield.


A review of effective training for obstetric emergencies published in 2009 [13] concluded that many of the courses then reviewed had common features: institution‐level incentives to train; multiprofessional training of all staff in their units; teamwork training integrated with clinical teaching and use of high‐fidelity simulation models. These themes have been echoed in a more recent review for obstetric training [14] that concluded that all maternity and neonatal health professionals should participate in in‐service training sessions. Furthermore, on‐site ‘in‐house’ training with low‐tech, highly realistic models is more readily implementable than offsite training at simulation centres and training integrated into institutional clinical‐governance and quality‐improvement initiatives is likely to have better results.


The various regional and national multidisciplinary training courses have different emphases, complement each other and supplement local training. A few illustrations of these specialist courses are listed here.



  • ALSO (Advanced Life Support in Obstetrics). This course is geared to midwives, obstetric senior house officers and junior specialist registrars and deals with the main obstetric emergencies in a structured systematic fashion. Candidates should gain a sound understanding of the problems and the structured approaches in how to manage them (www.also.org.uk).
  • mMOET (Managing Medical and Obstetric Emergencies and Trauma). This course is geared to a more senior and multidisciplinary group: obstetric consultant and senior specialist registrars (post MRCOG and at least specialty training year 5), anaesthetic consultant and senior specialist registrars, and senior accident and emergency doctors. These courses can also include midwives and obstetric physicians whose presence emphasizes and promotes the team approach that is so important in the obstetric emergency. This course runs candidates through approximately 25 emergency scenarios and skills and deals with more advanced and complex aspects of emergency obstetrics and emergency behaviour (www.moet.org.uk).
  • MOSES (Multidisciplinary Obstetric Simulated Emergency Scenarios). This course focuses on emergency behaviour and team‐working dynamics as they apply to the obstetric patient, rather than training on knowledge or techniques. It involves midwives, anaesthetists and obstetricians who often attend together from the same department. This course is very different from, and complements, MOET or ALSO (blsimcentre@bartsandthelondon.nhs.uk).
  • PROMPT (PRactical Obstetric Multi‐Professional Training). A training programme for maternity units, it was developed in Bristol, UK and can be purchased by maternity units, who then deliver the teaching locally.

Effects of emergency training


Whilst we increasingly rely on these training programmes, the current evidence supports an annual, local unit‐based, multiprofessional approach as these are most likely to translate into improved clinical outcomes. Not all training is productive and even the same teaching material delivered in different settings can have opposite results [15] but the best improvements to date have been reported from the PROMPT group, where there is evidence of significantly reduced preventable birth injury [1619] and an associated 90% reduction in litigation costs [20]. These reductions have been replicated in pilot sites across the world, including developing world settings.


Collapse


Collapse as it presents to the obstetrician can be due to a variety of causes, from the sometimes innocent vasovagal faint through to cardiac arrest, but the initial assessment and management of the patient is remarkably similar and requires a systematic disciplined ABC approach combined with manual uterine displacement of the uterus or lateral tilting of the pregnant patient to minimize aortocaval compression. The essential steps of how to approach the apparently lifeless patient are summarized in Fig. 25.1, and aim to make the crucial diagnosis of cardiac arrest (as opposed to reduced consciousness due to another cause) so that cardiopulmonary resuscitation (CPR) can be commenced early. Most other conditions require basic resuscitation with attention to airway and breathing combined with intravenous access and circulatory support while the cause of the problem is diagnosed and then treated (Table 25.1).

Basic life support for apparently lifeless patient, starting with call for help and approach patient safely and check responsiveness to continue assessment, etc. and ends with arrangement for C-section.

Fig. 25.1 Basic life support: approaching and treating the apparently lifeless patient.


Table 25.1 Causes, features and initial treatment of collapse in the obstetric patient (distinguishing features in bold).















































































Cause/risk factors Specific clinical features Specific treatment points: all need ABC + lateral tilt if undelivered
Adrenal insufficiency Inadequate or absent steroid cover in someone previously taking steroids Drug history can be sought
Hypotensive collapse
Metabolic imbalance
Supportive with intravenous fluids (check electrolytes, especially sodium may be low)
Hydrocortisone (200 mg i.v. stat)
Check BM: may need glucose
Amniotic fluid embolism Uterine tachysystole
Syntocinon hyperstimulation
Previous uterine surgery
Multiparity
Polyhydramnios
Restless, shortness of breath and cyanosis
Vaginal bleeding follows within 30 min due to disseminated intravascular coagulation [2]
Oxygen + ventilate
Deliver the baby as soon as possible
Hydrocortisone (200 mg i.v. stat)
(Aminophylline, diuretics, adrenaline, morphine)*
Anaphylaxis Drug administration, e.g. antibiotics, Voltarol, anaesthetic agents, Haemaccel, latex History of drugs/latex
Rash
Stridor
Oedema
Adrenaline (1 mL of 1 in 1000 i.m. or 1 mL of 1 in 10 000 i.v. repeated as needed) with intravenous fluids
Hydrocortisone (200 mg i.v. stat)
Chlorpheniramine (20 mg i.v.)
Aspiration (Mendelson’s syndrome) Inhalation after vomiting/passive regurgitation (reduced consciousness with unprotected airway) Shortness of breath, restlessness, cyanosis
Bronchospasm
Oxygen + ventilate
(Aminophylline, steroids, diuretics, and antibiotics)*
Bacteraemic shock Overwhelming sepsis due to especially Gram‐negative rods or streptococci Hypotensive
Warm/fever/blotchy
Sepsis care bundle: replenish circulation, systems support
Antibiotics intravenously (e.g. imipenem)
Cardiogenic shock Congenital or acquired disease
Cardiomyopathy
History
Restless, shortness of breath, chest pain
Sit up
Oxygen + frusemide
Eclampsia Associated with cerebrovascular events or pulmonary oedema or magnesium toxicity Hypertensive
Proteinuria
Magnesium sulfate (antidote is calcium gluconate)
Control blood pressure with hypotensives
Hyperglycaemia Diabetes Hyperventilation and ketosis Intravenous fluids, insulin (and potassium)
Hypoglycaemia Diabetes, Addison’s disease, hypopituitary, hypothyroid Sweating/clammy
Loss of consciousness
Intravenous glucose
Intracerebral bleed Arteriovenous malformation Fits, CNS signs and neck stiffness Supportive and urgent neuro‐imaging
Massive pulmonary embolism Usually deep pelvic thrombosis Restless, cyanosis, elevated jugular venous pressure Lie down, oxygen, IV fluids, anticoagulation/thrombolysis
Neurogenic Vasovagal (uterine inversion) Vaginal examination Intravenous fluids ± atropine
Reduce uterine inversion
Oligaemic Haemorrhage (can be concealed) Tachycardia, pale and cold Restore circulation and turn off the tap [24]
Pneumothorax
Pneumomediastinum
Previous history of labour/pushing Chest pain, shortness of breath Aspirate/drain

* These treatments should be undertaken under anaesthetic supervision in a high‐dependency or intensive care unit.


Cardiac arrest (Fig. 25.1)


CPR is not only difficult to administer but is particularly inefficient in the pregnant patient due to the following:



  • Difficulties in performing CPR in pregnancy: the uterus needs to be manually displaced; if there are insufficient pairs of hands, the patient must be tilted.
  • Increased oxygen requirements in pregnancy (20% increase in resting oxygen consumption).
  • Decreased chest compliance due to splinting of the diaphragm (20% decrease in functional residual capacity).
  • Reduced venous return due to caval compression limits cardiac output from chest compressions (stroke volume 30% at term compared with non‐pregnant state).
  • Risk of gastric regurgitation and aspiration (relaxation of cardiac sphincter).

For these reasons and to improve the chance of maternal survival it is considered appropriate to empty the uterus by performing a peri‐mortem caesarean section within 4–5 mins if CPR (performed with uterine displacement or lateral tilt) is ineffective [5]. To achieve this the obstetrician at such an arrest should be preparing for caesarean section almost immediately. It is reiterated that the point of emptying the uterus is to aid in the resuscitation of the mother and is not for fetal reasons. Fetal viability issues should not delay this procedure, which is worthwhile when the pregnancy is of sufficient size to compromise resuscitation; as a guide, if the uterus has reached the level of the umbilicus it should be considered.


To perform a peri‐mortem caesarean section rapidly, the skin incision should be that with which the operator is most familiar, and the uterine incision will be influenced by the gestation of pregnancy. These details matter little compared with the pressing need to evacuate the uterus and render the mother more receptive to life‐saving resuscitation techniques. A large caesarean section pack is unnecessary and in extremis all the obstetrician needs is a scalpel to commence the procedure whilst other instruments are being collected.


It is stressed again that this is not done for fetal reasons but there is no doubt that at more advanced gestations fetal viability is more likely the more quickly the baby is delivered: 70% survive intact if delivered within 5 min, falling to 13% after 10 min [21].


To detail the management of each possible condition that can cause maternal collapse is beyond the scope of this chapter, but Table 25.1 summarizes the different possibilities and those features specific to them in terms of risk factors, clinically distinguishing features and specific points of treatment. More detailed accounts can be found in references in the MOET manual [5] but a few summary points are highlighted here.


Airway problems


The airway of an obstetric patient is more vulnerable than in the non‐pregnant state. Not only is there more likely to be swelling and oedema, but the progestogenic effects that reduce gastric emptying and relax the cardiac sphincter increase the chance of regurgitation and subsequent aspiration of gastric contents. For these reasons the management of any obstetric patient with reduced consciousness requires careful attention to maintaining and protecting the airway, and this should involve an anaesthetist. In simple circumstances, the patient should at the very least be nursed on her side, and a jaw thrust and chin lift can aid in bringing the tongue forward to open the airway. Severe laryngeal oedema due to pre‐eclampsia or anaphylaxis are examples of situations that can critically compromise the airway in the obstetric patient, and in these circumstances an anaesthetist is needed extremely urgently to establish and maintain the airway (usually by a cuffed endotracheal tube).


Breathing problems


If the airway is patent but breathing is laboured or consciousness impaired, then supplementary oxygen is vital. This should be given by face‐mask with a reservoir bag, and the oxygen should be turned up to maximum at the wall in the emergency situation. Raised respiratory rate, restlessness and confusion are all signs of hypoxaemia, can precede collapse and should be taken extremely seriously. Oxygen saturation should be measured in air by a pulse oximeter, and arterial blood taken for gas analysis if there is any concern, and results of these should be reviewed with the anaesthetist on duty.


Circulatory problems


Circulatory problems can be due to cardiac disease (where the resulting pathology is usually pulmonary oedema and low‐output failure), inadequate venous return with resultant low‐output failure (massive pulmonary embolus) or an underfilled circulation (hypovolaemia, due to haemorrhage or sepsis). Early intravenous access with large‐bore cannulae is vital, but treatment needs to be specific to the cause. Cardiac failure patients do not require (and indeed may be killed by) volume expansion, but are helped by being sat up and given diuretics, and may need inotropic support. On the other hand, a woman with a pulmonary embolus or one who is hypovolaemic needs volume expansion and to be lain down flat. Distinguishing between these conditions is vital as the management of each would clearly be dangerous to the other. Hypovolaemia, which can be due to loss from the intravascular compartment (e.g. haemorrhage) or due to relative underfilling caused by vasodilatation (e.g. sepsis), is managed by volume expansion. Fluid replacement strategies with crystalloid or colloid remain controversial but the use of crystalloids in critically ill patients is supported by a Cochrane review [22] and Hartmann’s solution is preferable to dextrose [23].


Haemorrhage


Obstetric haemorrhage is one of the most common causes of major maternal morbidity and mortality [24,25] and successive confidential reports in the UK show that it accounts for approximately 0.5 deaths per 100 000 maternities [3]. Over the years these confidential enquiries have highlighted a variety of substandard care issues and emphasis is placed on the importance of clear local procedures and policies to trigger rapid and appropriate responses which should be rehearsed regularly. Furthermore, there should be senior input in high‐risk cases, especially women with a previous caesarean section and a low‐lying placenta, as their risk of a morbidly adherent placenta is increased. In such cases antenatal and intrapartum multidisciplinary consultant input is advocated, with clear plans for surgery and with conservative options for treatment considered in advance [26].

Sep 7, 2020 | Posted by in GYNECOLOGY | Comments Off on Obstetric Emergencies

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