Introduction
Exposure of women to trauma in general has increased in recent years due to their more active lifestyle. Trauma is the main cause of nonobstetric death in females between 14 and 44 years old,[1]
[2] occurring more frequently during the 3rd trimester of pregnancy than at any other stage in life.[3]
[4] Severe trauma in a pregnant woman can be considered a lesion of double magnitude,[5] with significant fetal mortality.[6] Its occurrence varies from 6 to 7% of pregnancies,[1]
[5]
[6]
[7] with hospitalization in 0.3 to 0.4% of cases.[1]
[5]
The effect of trauma on a pregnant woman depends on the gestational age, on the intensity of maternal-fetal aggression, and on the type and severity of the injury,[5] and it is generally difficult to predict the possibility of fetal loss after trauma.[1]
[8] The extent of maternal injury does not correlate with the degree of fetal injury,[3]
[9] and it known that even small traumas can cause fetal death and premature labor.[3]
Nine out of 10 traumatic injuries during pregnancy are classified as minor trauma, that is, one that does not involve the abdomen, rapid decompression, deceleration or shear forces, and that the patient does not report pain, vaginal bleeding, fluid loss or decreased fetal movement; however, between 60 and 70% of the fetal losses associated with trauma are due to mild trauma.[10]
[11] Although the risk of fetal death can be as high in an apparently trivial trauma as in a severe accident,[12]
[13] most pregnancies continue with a relatively small intervention and are not followed-up.[14] The currently dominant attitude is to consider that the relative risk of having a child with cerebral palsy after exposure to trauma is not significant,[3] and that the result of pregnancy is normal when no early warning symptoms are recorded.[15]
Pregnant women are more susceptible to abdominal trauma than to traumatic brain injury (TBI);[1] however, the importance of the latter should not be disregarded, mainly because of the possibility of causing a permanent vegetative state.[16]
[17] Traumatic brain injury is the factor that most contributes to nonobstetric mortality in developing countries, with ~ 20% of cases of maternal mortality being directly correlated to TBI.[18] According to Suddaby et al., out of 252 brain deaths, only 2.85%, that is, 5 cases, involve pregnant women between 15 and 45 years old.[19]
In Brazil, it is estimated that ~ between 6 and 7% of pregnancies are complicated by trauma, which shows that the incidence of trauma in pregnant women is increasing every year. Despite the cases of permanent vegetative state or of maternal brain death, the progression of pregnancy is a possibility due to the recent improvements in life support technologies, critical care management, and obstetric monitoring techniques. Despite the cases of permanent vegetative state or of maternal brain death, the progression of pregnancy is a possibility due to the recent improvements in life support technologies, critical care management, and obstetric monitoring techniques. Due to this progression, it is becoming possible to maintain the vital functions of the patient after brain death.[20]
The present work aims to provide a detailed review on the main complications involving TBI in pregnancy and on the vegetative state after TBI.
Methods
The present systematic review has been performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement ([Fig. 1]).
Fig. 1 PRISMA flow diagram.
Search Strategy
The following databases were inspected: Pubmed, LILACS, Scielo, and The Cochrane Database of Systematic Reviews. The search strategy utilized was as follows:
The last search was last updated in May 2020.
Study Selection
The inclusion criteria were:
-
1–Title with simultaneous presence of the two defined descriptors
-
2–Patient, Intervention, Control, Outcome and Study design (PICOS) criteria as below.
Patients: Pregnant women of all ages who suffered TBI. Patients who suffered nontraumatic brain injury were excluded.
Intervention/Control: Not required.
Outcomes: Recovery state based on the Glasgow Outcome Scale adapted for child, presence of injury on brain imaging, management, mortality and complications in women who suffered TBI, sequalae on fetus when the pregnant woman is in coma, and delivery route in these cases.
Study design: Full-text publications in the English language. Letter to the editor, abstract posters and citations were excluded.
Results
In our research, 4 (57.14%) of the 7 articles that met the inclusion criteria were case reports, which demonstrates the lack of studies focused on this theme and on this specific study population, making the subject lacking in data goals.
The study by Berry et al. was the only one that provided data; its objective was to investigate outcomes in pregnant trauma patients with isolated moderate to severe TBI, and it was concluded that besides being younger (24.9 ± 7.2 years versus 50.1 ± 23.8 years, p = 0.0001) and having a significantly lower systolic blood pressure on admission (126.9 mm Hg 17.5 versus 138.0 mm Hg 30.5, p = 0.0004), there were no other significant demographic and outcome differences between pregnant patients with TBI and their nonpregnant counterparts. Adjusting for confounding variables, pregnant patients with TBI had a tendency to increased mortality (adjusted odds ratio [AOR] 2.2; 95% confidence interval [CI], 0.9–5.1; p = 0.07).
Since all pregnant patients with TBI were between 15 and 47 years old, a separate analysis was performed with this specific age group. The only significant difference between the 2 groups was that pregnant women with TBI were younger (24.9 ± 7.2 years versus 29.0 ± 10.2 years,
p = 0.004) than their nonpregnant counterparts with TBI.[21] The results are summarized in [Table 1].
Table 1
Systematic review
|
Authors
|
Year
|
Type
|
Conclusions
|
|
PubMed
|
Aderet et al[16]
|
1984
|
Case Report
|
Pregnancy patients need a special maternal and fetal intensive care unit, special nutrition, and fetal monitoring.
|
|
Leroy-Malherbe et al[2]
|
2006
|
Follow-up
|
Fetal injury comes from a wide range of mechanisms. Post-traumatic evaluation of the fetus is often incomplete or absent.
|
|
Berry et al[21]
|
2011
|
Comparative study
|
Pregnancy patients with traumatic brain injury had ↓ Age, ↓ Systolic Blood Pressure and ↑ mortality than their nonpregnant counterparts.
|
|
Dawar et al[22]
|
2014
|
Case Report
|
Simultaneous craniotomy and cesarean section in the pregnant patient provide better outcome for both the mother and the baby.
|
|
Tawfik et al[23]
|
2015
|
Case Report
|
Case of a term pregnant patient who suffered traumatic brain injury and was managed by cesarean delivery followed by craniotomy under general anesthesia
|
|
Inoue et al[24]
|
2016
|
Case Report
|
Pregnancy and intrauterine fetal death can be a risk factor for paroxysmal sympathetic hyperactivity (PSH) exacerbation, and delivery can be useful to resolve refractory PSH and save the mother's life.
|
|
Kho et al.[18]
|
2018
|
Literature Review
|
Every woman of reproductive age with significant damage is still pregnant until proven otherwise by a definitive pregnancy test or an ultrasound test.
|
Discussion
Complications
For Leroy-Malherbe et al.,[2] in their study of 18 patients with neurological deficiency and with a history of accidents during pregnancy, it was shown that the score on the Glasgow results scale showed good recovery in 6% (1), moderate disability in 34% (6), severe disability in 34% (6), and persistent vegetative score in 20% (4). The neuroimaging was varied, ranging from normal in 17% (3) to injuries in 77% (14), of the most varied types: focal ischemic injury with congenital changes, ischemic injuries restricted to a vascular territory, diffuse ischemic injuries, periventricular leukomalacia, diffuse white matter abnormality, diffuse cortical and white matter atrophy, and a deceased patient had hemorrhagic lesions on pathological examination.
Presence of neurological deficits such as hemiparesis, neonatal seizures, cerebral palsy, hemorrhage or hydrocephalus were observed in children of mothers who suffered trauma during pregnancy.[3]
[8]
[9] A woman exposed to trauma, needing hospitalization during pregnancy, is under a 1.4 times higher risk of having a newborn with cerebral palsy when compared with a woman not exposed to trauma.[3]
It was observed that fetal injuries are more frequent after trauma in advanced pregnancy, with fractures of the skull bones and intracranial hemorrhage in the fetus being the most common, leading to death in most cases.[6]
[8] A traumatic origin is clear mainly for depressed skull fractures and cerebral hemorrhage.[2] Cranial fracture in the fetus is caused by the compression of the fetal head against the surrounding structures, such as the pubic symphysis, the pelvis (whole or fractured), the spine or the promontory.[8]
[9] Premature labor associated with trauma appears to be frequent, although it is rarely reported in the immediate postinjury period.[13]
[14] Diffuse axonal injury, as a result of strong accelerations/decelerations in the fetal brain, can result in the cessation of the growth of the head.[9]
Maternal hypovolemic shock, disseminated intravascular coagulation, and transient abnormalities of placental blood flow (reduced maternal-placental flow, placental embolization and detachment) can also be pointed out as the etiology for newborn brain injuries,[1]
[3]
[6]
[9]
[17] although there are no studies in the literature evaluating the effect of a hypercoagulable state and mortality in pregnant patients who suffered TBI; a hypercoagulable state, theoretically, puts patients at increased risk of complications and mortality.[21]
In addition, TBI-induced coagulopathy as an independent risk factor for increased mortality is well-described.[22] It is possible that the combination of the two can lead to a deep hypercoagulable state and worsen the result. Berry et al.,[21] in their study comparing pregnant and nonpregnant women who suffered TBI, demonstrated that although it is not significant, there was a tendency toward increased mortality in the pregnant TBI group (AOR: 2.0; 95%CI: 0.8–4.6; p = 0.12), which may be caused by a synergistic effect of a hypercoagulable state induced by pregnancy and coagulopathy induced by TBI.
As the etiologic agents for these types of lesions that should be pointed out as possible differential diagnoses, there are the other environmental factors, as well as perinatal anoxia and genetic factors.[9] Ultrasound tests are useful to assess the degree of brain damage in the newborn, as well as brain computed tomography (CT) and magnetic resonance imaging (MRI) exams.[5]
[8] Suggested protocol for emergency care and monitoring of pregnant women with TBI is shown in [Figure 2].
Fig. 2 Urgent Care Protocol and follow-up of pregnant women with traumatic brain injury. (own authorship).
Another complication is paroxysmal sympathetic hyperactivity (PSH), which is characterized by paroxysms of fever, hypertension, tachycardia, tachypnea, diaphoresis, and dystonic posturing. It was reported by Inoue et al. in a 16-year-old primiparous girl in the 11th week of gestation with who suffered a TBI during a motorcycle accident. From day 2, she developed intermittent episodes of tachycardia with tachypnea, fever, profuse sweating, and extensor posturing, and was diagnosed with PSH. Her condition only improved after delivery, after intrauterine fetal death was confirmed (16th week of gestation, on day 37 of hospitalization).[24]
Pregnant Women in Vegetative State
The prolongation of a pregnancy in a woman who has suffered severe brain trauma or who is brain dead is within the reach of current medicine. A fetus can develop normally in a comatose patient, despite the existence of complications of this condition (anemia, hypoxia, and digestive hemorrhage) and the use of medications.[5]
[17] The question that is not entirely clear, until now, is how long this pregnancy can be prolonged. Some authors have analyzed the use of intensive therapy to prolong a pregnancy for women with a gestational age of at least 24 weeks, since there is evidence that somatic death accours 2 to 4 weeks after brain death.[17]
However, case reports have challenged this limit, demonstrating the possibility of prolonging pregnancies with a lower gestational age.[5]
[16]
[17] According to Slattery et al,[25] a fetus born before 24 weeks of gestation has a limited chance of survival, with the possibility of spontaneous abortion or intrauterine death, especially if the pregnant woman is between 13 and 19 weeks of gestation.[20] At 24, 28 and 32 weeks, a fetus has ~ 30, 80 and 98 chances of survival, respectively, with 40, 10 and < 2% chance of suffering from a severe disability, respectively.[20]
[25]
Many factors can cause sequelae to the fetus when the mother is comatose.[16] During extended life support, patients develop severe complications, including infection, hemodynamic instability, diabetes insipidus, panhypopituitarism, metabolic instability, acute respiratory stress syndrome, and disseminated intravascular coagulation.[17]
[20] Maternal malnutrition due to the high catabolism and negative nitrogen balance that occur in individuals immobilized for a long period can affect the weight and brain development of the fetus,[5]
[16]
[26] although some authors refer that the fetus is only affected when the conditions of calorie consumption or protein intake are extreme.[16]
According to the findings of the systematic literature review by Esmaeilzadeh et al,[20] prolonged somatic care can lead to the delivery of a viable child with a satisfactory Apgar score and birthweight. In addition, children can develop normally without problems resulting from their intrauterine conditions, as there were six children who underwent postneonatal follow-up up for 24 months in the study and they all developed normally and, apparently, had no problems related to their exceptional intrauterine circumstances. Ethical issues must be considered when deciding to prolong a pregnancy of a woman who is brain dead, requiring the active participation of family members.[5]
[17] It is also important to address the context of the cost of prolonged use of intensive care resources.
Monitoring and Management
Increased plasma volume and cardiac output are some of the numerous anatomical and physiological changes that occur during pregnancy, which, combined with the blood diversion provided by the uterus-placental circulation, can mask the signs of hypovolemia.[17] Compression of the aorta and of the vena cava through the pregnant uterus when the patient is in the supine position can also confuse the interpretation of vital signs. Pregnant patients in a permanent vegetative state require special maternal-fetal monitoring. Uterine activity and fetal heartbeat must be recorded every 8 hours for 30 minutes,[17] through cardiothoracic graph with manual detection of fetal movements in the mother's abdomen, serial ultrasound for the evaluation of fetal growth, and 24-hour urinary estriol dosage correlated with creatinine clearance are important for the assessment of fetal vitality.[16] Strict hemodynamic control, blood gas analysis, electrolyte balance, acid-base and nutrition must be performed throughout pregnancy.[5]
In maternal brain death, special attention should be paid to mechanical ventilation. To facilitate the elimination of carbon dioxide from the fetus as a result of the effect of progesterone on the respiratory center, the pregnant woman develops hypocarbia mediated by an increase in tidal volume and respiratory rate. Hypocarbia is compensated by an increase in the excretion of bicarbonate by the kidneys.[27] The carbon dioxide tension, the tidal volume, and the maternal respiratory rate must be maintained ~ between 29 and 31 mm Hg, between 6 and 8 ml/Kg, and between 10 and 12/min, respectively, in the normal pregnant woman.281
The use of medication may raise some doubts about its effect on the fetus. Few agents have a teratogenic action if administered in the first 12 weeks of pregnancy. The drugs that should be avoided are ergotamines and warfarin derivatives; antibiotics such as aminoglycosides and those containing sulfa should be used with caution due to their adverse effects.[5]
The nutritional support needed by a pregnant woman before and after brain death is not the same. A pregnant woman with brain death will spend ~ 75% of the baseline energy expenditure of a healthy pregnant woman.[29] The feeding route can be initially enteral, through a tube. The gastric emptying of the pregnant patient is slower and, if there is a large gastric residue, variations in the angle of the bed can be made.
The risk of developing deep venous thrombosis is higher during pregnancy because of the immobility and the flaccid paralysis that follows brain death. It is important to do prophylactic anticoagulation, which is effective for the mother and safe for the fetus, with low molecular weight heparin being the safest and most effective medication.[20]
[29]
[30] Prophylaxis of venous thrombosis can be performed using subcutaneous heparin (5000 U, twice a day).[17] Persistent anemia conditions occasionally require blood transfusion, so the maternal hemoglobin level should be monitored.[8]
[30]
The braindead patient is liable to contract pneumonia due to ventilatory support, kidney and bladder infections due to urinary catheters, and septicemia due to intravascular catheters.[20]
[31] Maternal infections should be treated aggressively with the most effective substances, rather than choosing to use substances safe for the fetus, which may not effectively treat the infection.[32]
[33]
[34]
[35]
If the patient develops pituitary insufficiency, replacement of thyroid hormone, corticosteroids and synthetic vasopressin should be performed. For fetal lung maturation, corticosteroids should be administered to the mother from the 26th week of gestation with cycles every 10 days.[17] To avoid prolonged exposure of the fetus to glucocorticoids during maternal support, which are necessary to treat the adrenal insufficiency that usually occurs in brain death and for pulmonarymaturation, prednisone or methylprednisolone should be used, given that they cannot cross the placental barrier.[20]
[25] Suggested protocol for monitoring and management of pregnant women in vegetative state is shown in [Figure 3].
Fig. 3 Monitoring and management of pregnant woman in vegetative state. (own authorship).
Parturition
Much is questioned about the best route for delivery of mothers in a vegetative state. Even in the best of circumstances, a child with a gestational age < 24 weeks is unlikely to survive. Therefore, the risks and benefits of an induced delivery or cesarean section should be weighed, which should be reserved for the numerous complications resulting from the maternal state (fetal distress, placental detachment, uterine rupture, and anomalous presentations).[5] Cesarean sections are indicated in cases of recent maternal death or brain death, knowing that delivery should start within 4 to 5 minutes.[5] According to the study by Esmaeilzadeh et al,[20] all deliveries performed on pregnant women with brain death were cesarean, resulting in fetuses born alive.
Study Limitations
The present study has several limitations, since this is a topic that is rarely discussed in the literature. Due to the scarcity of more robust works on the subject, our casuistic had few works, most of which were case reports, which in fact impoverishes the quality of the meta-analysis.
