PDF
Citation
Print
INTRODUCTION
Esophageal atresia (EA) is the most common congenital esophageal anomaly [1]. However, EA with a proximal tracheoesophageal fistula (TEF; gross type B) occurs in only 1% to 2% of cases. The presence of TEF differentiates type B EA from type A EA. However, because both types often involve long-gap EA, surgery is difficult and the prognosis is poor owing to many postoperative complications. Moreover, there are yet no established surgical methods. In particular, low birth weight, congenital cardiac defects, and compromised respiratory function in conjunction with EA are known risk factors for a poor prognosis [2-4].
Among the studies published in Korea, a clinical analysis by Chang et al. [5] with a relatively high number of patients with EA did not include any patients with type B EA, indicating the rarity of this type. Among the case reports on long-gap EA in Korea, two reported on type A EA [6,7] but only one reported a case of type B EA [8]. In the latter case, the surgical method used was reverse gastric tube interposition, which is different from our case. We encountered the rare defect of type B EA in a male infant, and report here on the treatment process, from the initial misdiagnosis to the performance of esophageal reconstruction with gastric pull-up. We believe that this report can serve as a basis for treating similar patients in the future.
CASE REPORT
Written informed consent was obtained from the infant’s parents for the publication of this case.
A male infant with a birth weight of 1,616 g was born at 35 weeks and 5 days of gestation via a cesarean section. Intubation was performed owing to poor initial crying and activity, desaturation, and moaning. The patient was transferred to Pusan National University Children’s Hospital with a suspicion of EA based on failed gastric tube insertion.
The 34-year-old mother had a history of three miscarriages, and this infant was her first live delivery. The infant’s birth weight (1,616 g), height (41 cm), and head circumference (30 cm) were all below the 10th percentile for gestational age. On the basis of the detection of a twisted orogastric tube at the T2 level, absence of stomach gas, and relatively clear lungs on serial infantography, a diagnosis of pure EA (gross type A) was made (Figure 1A). A small-caliber sum-up tube remained in the upper pouch and was suctioned continuously.
A gastrostomy tube was placed, and a “feed and grow” approach was implemented in the neonatal intensive care unit at 2 days after birth. Total corrective surgery was planned when the patient’s body weight reached 5 kg. Although weaning from mechanical ventilation was possible at 5 days after birth, endotracheal intubation and mechanical ventilator care were needed because of subsequent recurrent atelectasis and dyspnea (Figure 1B). On chest computed tomography performed at 42 days after birth for respiratory assessment, although no fistula was found, the ends of the esophagus were confirmed at the T2 and T9 levels, indicating EA associated with a long gap involving seven vertebrae. However, because TEF was found on bronchoscopy performed at 48 days after birth, the diagnosis was changed to type B EA and weaning from mechanical ventilation became possible after excision of the TEF and cervical end esophagostomy.
At 49 days after birth (weight 2.5 kg), leakage of milk (more than half of the consumed volume) into the gastrostomy site occurred, causing skin damage. Diagnostic imaging with contrast infusion through the gastrostomy site confirmed a 30-mL stomach volume, and a Levin tube was advanced into the jejunum through the gastrostomy to establish continuous feeding (Figure 1C). We determined that the stomach with a small volume of 30 mL was suitable as a replacement for the esophagus, and at 141 days after birth when his body weight had reached 4.7 kg, esophageal reconstruction with gastric pull-up was performed. Esophagography was performed on postoperative day 7 to ensure the absence of leakage (Figure 2A). He was discharged 21 days postoperatively after confirming the absence of acid reflux on upper gastrointestinal endoscopy (Figure 2B). On assessment for associated vertebral defects, anal atresia, cardiac defects, TEF, renal anomalies, and limb abnormalities (VACTERL), we also identified an atrial septal defect. The toxoplasmosis, rubella, cytomegalovirus, herpes simplex, and others (TORCH) screening for congenital infections tested negative, and the patient had normal hearing test, neonatal screening test, and cranial ultrasound results.
Currently, the patient is 12 months old but his weight (6.5 kg), height (64.1 cm), and head circumference (43.8 cm) are still below the 10th percentile for corrected age. Although catch-up growth did not occur, he has been showing appropriate development for his age. His diet consists mostly of special anti-reflux formula, although he is currently eating baby food, three times a day, without any complications such as anastomotic stricture or aspiration pneumonia. His growth, development, and long-term complications will be monitored.
DISCUSSION
EA, which can be life threatening without corrective surgery, is an esophageal malformation occurring in approximately 1 in 3,500 live births [1,9]. Most cases involve pulmonary complications, and effective coordination and collaborative care among specialists are required to successfully treat cases of EA accompanied by congenital anomalies such as VACTERL [10]. Specifically, a careful therapeutic approach is essential for treating EA of gross types A or B because of the long gap between the upper and lower esophageal pouches, which complicates the surgical procedure [11].
In the current case, a fistula was initially absent on a chest computed tomography scan but was detected during bronchoscopy performed for recurrent pneumonia. The course of events resulted in a diagnosis of gross type B EA and a revised treatment plan. Although chest radiography is generally adequate to diagnose EA, the EA types are categorized according to the presence or absence and the location of a TEF. To determine the surgical method for treating long-gap EA, accurate gap measurement and identification of a fistula are crucial. In an international survey [12], preoperative bronchoscopy was found to have been performed in only 43% of cases. Atzori et al. [13] reported that preoperative bronchoscopy was beneficial in 45.2% of patients, and the planned surgical method was revised in 24.2% of cases, highlighting the importance of preoperative bronchoscopy. Accurate identification of the anatomical structure in a patient with EA is essential for selecting the appropriate surgical method and for optimal timing of treatment. Impaired lung function, indicated by the presence of pneumonia or need for a ventilator, is a poor prognostic factor [14,15]. Preoperative bronchoscopy is recommended, given its advantageous effects in terms of patient survival, length of hospitalization, and cost.
In general, growth is limited in patients with intrauterine growth retardation [16]. To promote growth preoperatively in our patient, we initiated aggressive parenteral nutrition and simultaneous feeding. The goal was early termination of parenteral nutrition to prevent infections via the central line, and enteral nutrition was selected to strengthen the immune system and prevent the atrophy of intestinal cells [17]. Our patient’s stomach volume was insufficient for bolus feeding for total enteral nutrition after a body weight of 2.5 kg was reached. Consequently, a tube was inserted into the jejunum via gastrostomy to achieve continuous enteral nutrition, which facilitated growth and eventually allowed surgical treatment. Although the long-term application of continuous tube feeding is not recommended, considering the biological aspects of feeding-associated insulin secretion, rendering it a less-than-optimal method of feeding, we believe that its short-term application is a more effective method than total parenteral nutrition.
Although patients with type B EA typically have long-gap EA and can be treated using various surgical methods, including staged repair and esophageal replacement, guidelines have not been established. Historically, immediate or delayed primary repair has been considered inappropriate for long-gap EA, and long-gap EA is an absolute indication of esophageal substitution. However, in the last 20 years, there has been a dramatic increase in the number of cases of long-gap EA with successful esophageal repair [18,19]. As our patient had a low birth weight and a compromised respiratory condition, delayed surgery was planned. Although an insufficient stomach volume was confirmed on the mid-treatment assessment, resulting in continuous tube feeding via a gastrojejunal tube, esophageal reconstruction with gastric pull-up was selected based on this finding.
Endoscopic surveillance is recommended to confirm ulcerative esophagitis and dysplastic epithelial changes in the esophageal remnants. In the present case, the absence of severe gastroesophageal reflux was determined with postoperative endoscopy. Although there have been reports of rare cases accompanied by obstructive intestinal disease [20], our patient did not have any other intestinal disease and oral feeding without dysphagia was possible. Although the initial failure to detect a fistula likely exacerbated the condition of the lungs, leading to conventional ventilator care for 51 days preoperatively and postoperatively and oxygen treatment for 93 days, the patient was discharged without home oxygen.
We identified a limitation in the treatment of our patient in that the fistula was found after the condition of the lungs had deteriorated, although the diagnosis and treatment plan were revised upon fistula detection on preoperative bronchoscopy. Patients suspected of having pure EA require a thorough examination for subtle tracheoesophageal connections to prevent lung complications. As our patient had a small stomach volume, esophageal reconstruction with gastric pull-up was performed successfully after continuous feeding through a gastrojejunal tube, and oral feeding was ultimately possible. Feeding to promote growth before total corrective surgery must be tailored to the individual patient’s needs.
Long-term follow-up observations should be conducted to further confirm our findings in this patient; however, we conclude that esophageal reconstruction with gastric pull-up is a suitable surgical method for patients with a small stomach volume. Furthermore, continuous collaboration between neonatologists and pediatric surgeons is crucial for a successful treatment of premature infants with fetal growth retardation with type B EA.
XML Download