Management of Common Newborn Emergencies
1General Physician, Pediatric EmergencyDepartment, Hospital Nacional de Niños, Costa Rica
2PediatricRespiratoryPhysician, Pediatric Respiratory Department, Hospital Nacional de Niños, Costa Rica
Received Date: May 25, 2020; Published Date: May 29, 2020
Patients in the neonatal period can present in the emergency department with many life-threatening conditions.Knowledge of these presentations by physicians that work in the emergency department is mandatory for the immediate approach of the critically ill infant. It is the responsibility of the emergency department team to identify these conditions and to stablish the best approach; this includes stabilization of the patient, differential diagnosis based, laboratory and images findings; and a well guided treatment. Serious bacterial infections, congenital cardiac disease, gastro intestinal emergencies (including malrotation with midgut volvulus and necrotizing enterocolitis), respiratory conditions, neurologic disorders and child abuse are the most common diagnosis in this type of scenarios. The main objective of this article is to review the most common conditions of the critical ill infant in the emergency department.
Non-serious conditions are the cause of the majority of visits to the emergency department (ED) in these age group patients . Although infection is the most reported cause of the ill appearance among neonates and young infants, there are other clinical conditions that have similar presentations and also represents serious entities of an unwell infant [2,3]. The ED personnel should be ready to identify conditions that increased the mortality in this population, and to have a step-approach to follow in this case without delaying treatment.
Recognition and Approach of the Critically Ill Neonate
The first step for any crucial diagnosis is the clinical history. The physician should always check for prenatal, perinatal and postnatal history. Prolonged membrane rupture or perinatal maternal fever is an important risk factor for sepsis. Prematurity and low birth weight are one of the major contributors to infant mortality [4,5]. Other important information is the Apgar score and need for resuscitation at birth, weight gain in the first week, frequency in urination and bowel movements, as well as feeding.Any change in the patient normal pattern could mean a serious condition that might need further evaluation.
A complete physical examination can help detecting anomalies that may risk the newborn life. Evaluation of neonatal size, weight, and vital signs as heart rate, respiratory rate, oxygen saturation level, blood pressure and temperature are necessary. The Pediatric Assessment triangle (PAT) is a well stablished method for rapid assessment that should be done in every child in the ED, this triangle includes theevaluation of the infant’s appearance, work of breathing and circulation to skin [6,7] (Figure 1).
Evaluation of the airway and breathing is very important. Work of breathing, respiratory rate and auscultation is essential. The normal respiratory rate is 40 to 60 breaths per minute in neonates. Physicians should verify that the patient has adequate ventilation and oxygenation, as well as need for positioning and suctioning. Abnormal sounds (snoring, grunting, stridor, audible wheeze and any abnormal sounds) associated with signs of increase work of breathing (sniffing position, nasal flaring, retractions, paradoxical chest movements) has to be interpreted as signs of respiratory distress .
Circulation, including hydration status, capillary refill time (normal less than 2 seconds), and heart rate should be evaluated. The normal neonatal heart rate is between 120 and 160 beats per minute, and the systolic blood pressure 60 to 90 mmHg . Hypotension is a late finding in a patient with shock.
A direct guided neurological examination should be performed. Some aspects that should be included are muscular tone, cranial nerves, primitive reflexes and consciousness (Table1). Seizures may indicate abnormalities including low glucose and abnormal electrolyte levels, central nervous system infections, and metabolic disease .
Table 1:Common developmental reflexes in the newborn.
Assessment of the abdomen and genitourinary tract is also something that has to be done. The liver border is frequently palpated approximately 1 cm below the right costal margin. The umbilical cord has to be inspected looking for signs of infection and bleeding. Male infants should be evaluated for hypospadias or other urethral anomalies, inguinal hernias, varicoceles, hydroceles and undescended testis .
Skin conditions are a frequent consultation in the ED. The most common is erythema toxicum neonatorum, occurring in almost 20- 50% of the newborns; is a common pustular eruption seen in term neonates within the first 72 hours of life that resolves spontaneously within one week . Abnormal skin color should be evaluated, especially when jaundice appears. Jaundice can be associated with life threatening illness like sepsis or metabolic disease .
The first step in assessing the critically ill neonate is the first impression with the PAT. The first impression includes aparience, respiratory effort and circulation to the skin. After PAT, the primary assessment follows with evaluation of airway, breathing, circulation, disability and exposure (ABCDE). The physician has to check for vital signs, placement of a cardiac monitor and pulse oximeters; bedside testing of blood glucose should be done promptly . Delivery of oxygen by high flow mask may be sufficient to reverse hypoxia in the ill neonate. If no peripheral intravenous lines can be established, either an intra-osseous line or umbilical catheter must be placed. When saline boluses are required, the physician initially should begin with 5-10ml/kg and then check on vital and clinical signs of perfusion.Normal neonatal glucose goes above 35-40 mg/ dl, below that number is considering hypoglycemia  (Figure 2).
Laboratory tests are needed when there is a clinical suspicion, but in the ill neonate there are unspecific signs and symptoms that vary alongside the different diseases. Electrolytes, serum glucose, and calcium level; a complete blood cell count (CBC); pro-thrombin time (PT); partial thromboplastin time (PTT); and blood cultures should be considered once IV access. Other tests may be considered depending on the differential diagnosis .
Infectious disease emergencies:Congenital infections and neonatal sepsis are important conditions in this age group.It is estimated that 12.5% of febrile infants have a serious bacterial infection and the incidence in pediatric population younger than 28 days may be as high as 20% [15,16].
Neonatal sepsis can be associated withhigh mortality and morbidity. It can be classified in early onset sepsis (EOS) and late onset sepsis (LOS). EOS is present in the first week of life and is associated with vertical transmission, being the vaginal bacteria flora of the mother the most common source . The risk factors are prolonged membrane rupture (>18 hours), maternal age >35 years, cesarean section, chorioamniotis, maternal B streptococcal colonization, maternal fever and presence of sexually transmitted disease. Group B streptococcus and E. coli are the most common bacteria in early onset sepsis, alongside with other microorganism found in Table 2 .
Table 2:Most common agents in EOS and LEOS.
LOS is presented from day 7 to 28 days of life and it is not usually associated with complications in the obstetric scenario, therefore these neonates may have risk factors that can be identified as triggers. For example, disruption of the skin or mucosa due to invasive procedures (intravascular catheter) increases the risk of late-onset infection.In LOS, Gram-positive bacteria are the most common, in this case CoNS, S.aureus and Enterococcus species are the ones with general higher incidence.
Table 3:Clinical Presentation of a Septic Neonate.
Clinical presentation: Clinical manifestations vary from subtle symptoms to septic shock. Most of the signs and symptoms are nonspecific and are listed in Table 3. The physical examination should look for the source of infection; changes in basal temperature are the most common clinical finding. In full term infants hyperthermia is more common than hypothermia. Lethargy, irritability, and decreased oral intake are important findings related to neonates with a septic condition . It is estimated that 85 percent of newborns with EOS, have signs of respiratory distress (tachypnea, grunting, flaring, use of accessory muscles).
Management and treatment of neonatal sepsis: Management should start with the evaluation of ABCDE with interventions depending on the abnormality found. Standard laboratory tests for the neonate with suspected sepsis are described in table 4. The immature-neutrophil to total neutrophil ratio greater than 0.2 is 60 to 90% sensitive and 70%-80% specific for the diagnosis of neonatal sepsis. It is recommended that the urine sample collection for the urinalysis, should be done via bladder catheterization or supra-pubic aspiration, to reduce the rate of contaminated samples. When respiratory symptoms are noted, a chest x-ray is indicated. If the patient presented with diarrhea, an initial stool sample must be performed .
Inflammatory markers are not specific to sepsis and have limitations. For example CRP is a marker of inflammation therefore is not limited to sepsis, and will be positive at least 8-10 hours after the sepsis started.The step-by-step approach (Figure 3) makes it easier to classify the patient’s risk. This algorithm evaluates febrile infants aged 0 to 90 days and organized them in low, intermediate or high risk patients. The factors that are included are sequentially: general appearance of the infant, the age, urinalysis and, the results of blood biomarkers, including PCT, CRP, and absolute neutrophil count (ANC). If any patient does not complete at least one of the criteria that is listed in the algorithm for low risk, it is immediately classified as high risk and needs a complete diagnostic evaluation [16,20].
Treatment with empiric antibiotics should be started. Ampicillin and gentamycin are the preferred empiric therapy. If there is a need to add another antibiotic a third-generationcephalosporin can be added depending on the antibiotic resistance and type of infection. In cases of LOS it its recommended coverage with vancomycin combined with aminoglycoside [21,22].
Bacterial meningitis in children is one of the most challenging and high-risk condition in the ED. Group B Streptococcus (GBS) and Escherichia coli are the most common causative agents in neonates and mortality rate is around 6.9% . Listeria monocytogenes, non-typeable H influenzae, and group A Streptococcus are uncommon in this period of life. Neonates, young infants, and immunocompromised older children are at highest risk. Nowadays, the use of intrapartum antibiotics to prevent neonatal GBS infection has reduced its prevalence in the neonatal period.Common bacterial meningitis pathogens are: Group B Streptococcus (39%), Gram-negative bacilli (32%), Streptococcus pneumonia (14%) and Neisseria meningitidis (12%) .
Clinical presentation:b> Fever, vomiting, seizures, and altered mental status are the predominant signs of meningitis in the neonatal age, symptoms sometimes can be subtle so every patient with less than 28 days with suspected sepsis should always be screened for meningitis .
Management and treatment: ABC´s (airway, breathing, and circulation) is a standard procedure on the initial evaluation and stabilization of the patient, alongside with intravenous (IV) and antibiotics . Lumbar puncture with CSF analysis and culture, peripheral blood cultures and other specific laboratory markers such as procalcitonin are needed to increase the sensitivity of the diagnosis confirmation by laboratory test. According to some literature, the median CSF WBC count was significantly higher in infants aged less than 28 days (3 cells/mcL; 95th percentile, 19 cells/mcL) than in infants aged 29 to 56 days (2 cells/mcL; 95th percentile, 9 cells/mcL, P < .001) .
Appropriate initial empiric coverage includes ampicillin and Cefotaxime. It is not common for neonates to have meningitis caused by methicillin-resistant Staphylococcus aureus (MRSA) or resistant S. pneumonia, however if there is a suspected meningitis by one of this two agents, vancomycin can also be added. Finally, there is limited evidence for the use of routine adjuvant steroids, therefore it is not recommended for treatment of neonatal meningitis .
Neonatal herpes (HSV)
Neonatal herpes is an uncommon infection occurring in 1 of every 32000 deliveries and presents between the second and third week of life. The most common risk factor is birth to an HSV infected mother; it represents a higher risk being born with vaginal delivery in mothers with primary genital infection .
Three clinical manifestations are important for the prediction of morbidity and mortality. First the disseminated type, in which multiple organs including the liver, lung, adrenal glands, skin, eye, and brain (60 to 75 % of disseminated HSV) are involved; and it represents 25% of HSV infections.The second is CNS infection without disseminated disease, but can also be associated with skin, eyes and mouth manifestations; it occurs in 30% of HSV infections. The third one is the skin, eye, or mouth disease and it represents approximately 45% of HSV disease; this one does not include CNS or disseminated HSV infection. Risk factors for neonatal HSV are: duration of rupture membranes, integrity of cutaneous barrier, maternal antibody status, vaginal delivery and type of HSV (HSV 1 vs. 2) [25,26].
Table 4:Standard laboratory and image tests for suspected neonatal sepsis.
Table 5:Recommended antibiotics and dosages for neonatal sepsis.
HSV cultures, PCR and whole blood sample are recommended. Laboratory definitive diagnosis is made by the isolation of HSV through culture, but PCR for HSV detection is more sensitive than viral culture in the CSF and blood, therefore it is the preferred test for disseminated and central nervous system HSV presentation. Tzanck test and detection of HSV antigen by direct immunofluorescence assay are not sensitive for HSV infection, therefore it is not recommended and should be avoided . Treatment should start with supportive care, initial empiric broad spectrum antibiotics and administration of acyclovir. Initiation of treatment has shown to decrease mortality from 90 to 31% (Table 5).
Gastrointestinal emergencies (GI): There are clinical manifestations of the GI tract that may increase the probability of a serious illness.Vomiting (especially bilious), diarrhea, GI bleeding, and jaundice alongside with hemodynamic instability are symptoms that should raise concern in an ED. Malrotation in neonates including volvulus and duodenal obstruction, necrotizing enterocolitis and biliary atresia are some of the most common GI emergencies in the newborn period.
Intestinal malrotation (volvulus and duodenal obstruction)
Volvulus occurs when the small bowel twists around the superior mesenteric artery compromising its vascularity and producing small bowel ischemia. It is estimated that one-third of children with malrotation in the neonatal period, are at risk of presenting a volvulus . In neonates, malrotation can also be presented as duodenal obstruction. It is produced by Ladd bands which cross the duodenum or by association of duodenal atresia and stenosis [28-30].
Clinical presentation: Volvulus usually presents with bilious vomiting and abdominal distention. It is common an acute presentation, but it can also be presented in a chronic way with episodic vomiting and abdominal pain, suggesting intermittent volvulus. The symptoms may vary, when the infant is younger at the time of presentation. Other symptoms include, loss of appetite, apneas, constipation and poor growth (31) The necrotic bowel can cause a third space fluid losses and also septic shock, with hemodynamic compromise. On the other hand, even though duodenal obstruction shares a similar vomiting characteristic (bilious), it is usually presented without abdominal distension. In a neonate, bilious vomiting is a surgical emergency until proven otherwise .
Management and treatment: When malrotation is suspected a complete blood cell count, electrolytes, blood urea, nitrogen, creatinine and blood group should be taken. Usually these patients are presented with dehydration, acidosis and elevated WBC . The diagnostic test of choice is an upper gastrointestinal (UGI) study, which has a sensitivity of 96% for malrotation. Some positive signs of malrotation are the classic bird-beak sign and the corkscrew pattern in the dilated proximal duodenum with contrast. Abdominal radiographs findings are not specific, but a distended bubble of air in stomach and duodenum with gasless abdomen are common findings in malrotation. Free air may be observed when there is a perforated segment from the ischemic bowel .
Initial treatment should be focused in fluid and electrolyte replacement and a nasogastric tube should be place.The definite treatment is the surgical resolution and antibiotics are needed to be administered if there are signs of peritonitis and shock .
Necrotizing enterocolitis (NEC) is one of the most common gastrointestinal emergencies in the neonatal period and is usually seen in premature infants. It is common in the first 10 days of life and it consists in an ischemic necrosis of the intestinal mucosa associated with severe inflammation, invasion of enteric gas forming organisms, and dissection of gas into the bowel wall and portal venous system. It is a condition with high mortality, overall between 20% and 40%. Its etiology is multifactorial .
Clinical presentation: Usually it is presented in preterm infants, although a 10% of cases occur in term newborns. (ref) The most frequent sign of NEC is an acute change in feeding tolerance with association of other clinical manifestations like ill appearance infant, with irritability, lethargy, anorexia, bloody stools and distension of the abdomen.
Management and treatment: Laboratory findings can be helpful in making the diagnosis of NEC. Findings are often anemia with leukocytosis, thrombocytopenia, evidence of disseminated intravascular coagulopathy (DIC), and in 20% of cases a positive blood culture. Also, electrolytes abnormalities can be present [33,34].
For diagnostic issues, a plain radiograph of the abdomen is usually used to confirm the diagnosis of NEC with intraluminal gas, portal venous gas, free intra-peritoneal gas, and dilated loops of bowel, bowel wall thickening, and perforation which can occur in 12%-30% of patients. Ultrasonography has become a very useful tool in these cases because it aloud to detect free fluid .
Treatment of NEC includes an orogastric or nasogastric tube, antibiotics with anaerobic and gram-negative coverage (ampicilin, gentamycin, metronidazole), and aggressive hydration. Surgical intervention is indicated when pneumoperitoneum is present. Patients with NEC but without pneumoperitoneum can be followed up with repeated radiographs every 6 to 8 hours to check on NEC progression .
Neurological emergencies in neonates: Neurologic emergencies in a newborn can be manifested with unspecific and subtle symptoms, for example changes in the feeding pattern only.
Neonatal seizures are often difficult to treat. It usually addresses a neurological specific condition, most commonly perinatal hypoxia-ischemia which accounts for approximately 50- 60%, and usually starts in the first 24 hours after birth. Mortality ranges from 15 - 40% . Intracranial infections are responsible for 5% to 10% of neonatal seizures. Nonbacterial etiologies include toxoplasmosis, cytomegalovirus, and herpes simplex. Bacterial infections include a group already discussed earlier. Any infant with symptoms of sepsis should have a septic work-up (including blood, urine, and cerebrospinal fluid (CSF) cultures.  Intracranial hemorrhage account for 10% of all cases, specially matrix intraventricular hemorrhages, and metabolic disturbances. Inborn errors of metabolism like a defect in pyridoxine metabolism might produce seizures in the neonatal period that will not ceased with antiepileptic drug therapy [38-40]. Causes of seizures in the neonatal period are shown in Table 6.
Table 6:Causes of Neonatal seizures.
Management and treatment: In the immediate care of a seizure the physician should first prioritized the stabilization of the airway, followed by breathing and circulation status (ABC’s). If the respiratory system is compromised, supplementation of oxygen should be administered and getting blood glucose measurement is essential. If hypoglycemia is documented a bolus of 10% dextrose of 2-4ml/kg should be indicated .
Laboratory tests should include guided causes of differential diagnosis such as metabolic disorder (glucose, sodium, calcium and magnesium levels). Other tests may include hematocrit, electrolytes, blood urea and nitrogen, phosphate, serum ammonia, blood gases and possibly blood cultures and lumbar puncture .
The first line of treatment in seizures is benzodiazepines like Lorazepam. If the seizure does not stop second line treatment is indicated (Phenobarbital), if it is not sufficient a third line such as Fosphenytoin or Phenytoin can be use (Table 6). If presented with refractory status epilepticus, the clinician will need to manage and secure the airway, start Midazolam infusion and prioritize this patient for the intensive care unit admission . Pyridoxine (Vitamin B6) can be administered if there is persistence of the seizures, at 100mg dosage. Acyclovir can be added in the presence of encephalitis (Table 2).
Further studies like cranial computed tomography can be done after the seizure event stopped, if there is no clear cause of the seizure, also cranial ultrasound looking for the identification of intracranial hemorrhage, and also EEG is often required  (Table 7).
Table 7:Pharmaceutical management of neonatal seizures.
Many neonatal serious conditions may vary in presentation, but most of them are initially non-specific. The promptly recognition and knowledge of atypical features can improve the approach and give an earlier diagnosis. Every ED should always stablish an early communication with the pediatric or neonatal unit for a possible transfer in the second part of this article respiratory and cardiological conditions will be reviewed.
Conflict of Interest
No conflict of interest.
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