Management and prevention of endotracheal intubation injury in neonates

Consequences of NICU Intubations: Incidence, Identifications, and Interventions

OBJECTIVE

Prolonged intubation often leads to laryngeal injuries such as subglottic stenosis (SGS), especially in neonates with prematurity and congenital defects key for tissue healing. Recognizing at risk patients in the neonatal intensive care unit (NICU) is not well studied. The study's goals were to determine intubation risk factors, characterize laryngeal injuries, and calculate the incidence of intervention.

STUDY DESIGN

Retrospective case review.

SETTING

Quaternary pediatric referral center.

METHODS

This retrospective study included all intubated patients in the NICU from April 1, 2020 to 2023. Electronic records were reviewed for demographics and intubation details. Patients were categorized to into intubation only or intervention groups, including direct laryngoscopy and bronchoscopy (DLB) and tracheostomy history.

RESULTS

A total of 441 patients were identified with 94 (21%) neonates undergoing DLB. Characteristics impacting intervention included older gestational age, genetic syndromes, and congenital heart disease. Significant risk factors were older age at first intubation, recurrent intubation events, longer intubation duration, and larger endotracheal tube (ETT) diameter, but not birth weight or intubation attempts. Otolaryngology was more likely to intubate the intervention cohort. SGS overall incidence was 2.95% with balloon dilation in 6.4%. Two-thirds of neonates with DLB ultimately required tracheostomy, in which all variables remained significant risk factors except for gestational age.

CONCLUSION

Older age at first intubation, more intubation events, longer intubation duration, and larger ETT increased risk for future DLB and tracheostomy but not birth weight or number of intubation attempts. Most NICU patients selected for DLB ultimately required further procedures.

Factors that determine first intubation attempt success in high-risk neonates

BACKGROUND

Approximately 50% of all neonatal endotracheal intubation attempts are unsuccessful and associated with airway injury and cardiorespiratory instability. The aim of this study was to describe intubation practice at a high-risk Neonatal Intensive Care Unit (NICU) and identify factors associated with successful intubation at the first attempt.

METHODS

Retrospective cohort study of all infants requiring intubation within the Royal Children's Hospital NICU over three years. Data was collected from the National Emergency Airway Registry for Neonates (NEAR4NEOS). Outcomes were number of attempts, level of operator training, equipment used, difficult airway grade, and clinical factors. Univariate and multivariate analysis were performed to determine factors independently associated with first attempt success.

RESULTS

Three hundred and sixty intubation courses, with 538 attempts, were identified. Two hundred and twenty-five (62.5%) were successful on first attempt, with similar rates at subsequent attempts. On multivariate analysis, increasing operator seniority increased the chance of first attempt success. Higher glottic airway grades were associated with lower chance of first attempt success, but neither a known difficult airway nor use of a stylet were associated with first attempt success.

CONCLUSION

In a NICU with a high rate of difficult airways, operator experience rather than equipment was the greatest determinant of intubation success.

IMPACT

Neonatal intubation is a high-risk lifesaving procedure, and this is the first report of intubation practices at a quaternary surgical NICU that provides regional referral services for complex medical and surgical admissions. Our results showed that increasing operator seniority and lower glottic airway grades were associated with increased first attempt intubation success rates, while factors such as gestational age, weight, stylet use, and known history of difficult airway were not. Operator factors rather than equipment factors were the greatest determinants of first attempt success, highlighting the importance of team selection for neonatal intubations in a high-risk cohort of infants.

Anesthetic management of inguinal hernia in an ex-premature infant with subglottic stenosis: a case report

BACKGROUND

We report the anesthetic management of inguinal hernia repair for an infant with subglottic stenosis. A previously scheduled operation had been cancelled due to unexpected airway trouble during the induction.

CASE PRESENTATION

A boy was born at 24 weeks of gestation and his trachea was intubated for 45 days. At 16 months old, surgery for inguinal hernia was planned, but cancelled due to unexpected narrow airway, and subglottic stenosis was first suspected. At 17 months old, he was transferred to us for inguinal hernia surgery. After careful discussion between the surgical team and the anesthesiologists, a strategy to manage this patient was developed. He underwent open hernia surgery under spinal anesthesia and diagnostic rigid bronchoscopy under tubeless general anesthesia separately, which revealed low-grade stenosis and some subglottic cysts. The postoperative course was uneventful.

CONCLUSION

Interdepartmental discussion weighing risks and benefits may deduce the safest and most appropriate anesthesia method.

Perspectives on developing and sustaining a small baby program

The Small Baby Program at Nationwide Children's Hospital was launched in 2004 in response to a need for better care for infants born extremely preterm. Standardization of care, decreased variability, multidisciplinary support, and robust research and quality improvement have allowed us to greatly improve our outcomes. In addition to the numerous medical and technological advances during this time, a strong commitment to kangaroo care and family-centered care have been integral to the growth and success of our program. The following review of the program aims to highlight the above areas while detailing the specific processes that have contributed to its ongoing success. Key areas of focus have been on respiratory management, neurodevelopmental care, and nutritional optimization. The implementation and continued refinement of the Small Baby Program has allowed us to improve the survival of extremely preterm infants, decrease certain morbidities, and improve long-term neurodevelopmental outcomes.

Correlation of airway ultrasonography and laryngoscopy findings in adults with subglottic stenosis: a pilot study

PURPOSE

Ultrasonography of the airway has potential as an alternative, non-invasive, method to monitor patients with subglottic stenosis in an outpatient setting. This prospective, interventional, double-blinded study aimed to correlate ultrasound-based and laryngoscopy-based subglottic stenosis assessment in adults.

METHODS

The study was conducted between July 2020 and March 2021 at a tertiary referral center. Consecutive adult patients with subglottic stenosis were evaluated using airway ultrasonography 1 day prior to scheduled laryngoscopy. The radiologist was blinded to the preoperative endoscopic findings, and the primary surgeon was blinded to the ultrasonographic measurements. The intraoperative subglottic diameter was defined as the outer diameter of an endotracheal tube passing through the subglottis without producing an air leak.

RESULTS

Sixteen patients (11 females; age range, 17-66 years; mean = 44.06, SD = 12.79) were included. The ultrasonographic subglottic diameter ranged from 5.20 mm to 8.00 mm (mean = 6.24 mm, SD = 0.90). In 15 of 16 patients, the diameter difference between the ultrasonographic and intraoperative measurements ranged from -0.80 mm to 0.30 mm (mean = -0.20 mm, SD = 0.35). However, patient 6 had a difference of - 2.10 mm between the two measurements, which was attributed to thick laryngotracheal secretions interfering with the ultrasonographic air shadow. Data analysis of all 16 patients showed a statistically significant correlation between the readings obtained by the two techniques (r = 0.84, P = 0.000051).

CONCLUSION

This study found a significant correlation between ultrasonography-based and laryngoscopy-based subglottic stenosis assessment in adult patients. It provides a basis for an alternative and potentially reliable method to monitor patients with subglottic stenosis.

Surfactant Administration Through Laryngeal or Supraglottic Airways

Noninvasive ventilation is frequently used in the treatment of infants with respiratory distress syndrome. This practice is often effective in higher gestational age neonates, but can be difficult in those with lower gestational ages as surfactant deficiency can be severe. While noninvasive ventilation avoids the negative effects of intubation and ventilator-induced lung injury, failure of this mode of support does occur with relative frequency and is primarily caused by the poorly compliant, surfactant-deficient lung. Because of the potential problems associated with laryngoscopy and intubation, neonatologists have developed various methods to deliver surfactant in minimally invasive ways with the aim of improving the success of noninvasive ventilation. Methods of minimally invasive surfactant administration include various thin catheter techniques, aerosolization/nebulization, and the use of a laryngeal mask airway/supraglottic airway device. The clinician should recognize that currently the only US Food and Drug Administration-approved device to deliver surfactant is an endotracheal tube and all methods reviewed here are considered off-label use. This review will focus primarily on surfactant administration through laryngeal or supraglottic airways, providing a review of the history of this technique, animal and human trials, and comparison with other minimally invasive techniques. In addition, this review provides a step-by-step instruction guide on how to perform this procedure, including a multimedia tutorial to facilitate learning.

Pediatric tracheal trauma

Tracheal trauma is an uncommon but potentially serious cause of airway injury in children. Presentation may be acute in cases of blunt or penetrating trauma, or delayed in cases of chronic irritation or indwelling endotracheal tubes. Symptoms include dyspnea, progressive respiratory distress, neck and chest swelling and ecchymosis, and dysphonia. Workup is pursued as allowed by the patient's clinical status and may include plain radiography, computed tomography, and endoscopy. Accuracy and efficiency of diagnosis is paramount for those at risk of rapid decompensation. Treatment may include observation, elective and strategic intubation, or primary surgical repair.

Association of anesthesia type with prolonged postoperative intubation in neonates undergoing inguinal hernia repair

PURPOSE

The purpose of this study is to determine factors associated with prolonged intubation after inguinal herniorrhaphy in neonates.

METHODS

Retrospective, single institution review of neonates undergoing inguinal herniorrhaphy between 2010 and 2018. Variables recorded included demographics, comorbidities, ventilation status at time of hernia repair, and anesthetic technique.

RESULTS

We identified 97 neonates (median corrected gestational age 39.9 weeks, IQR 6.6). The majority (87.6%) received general anesthesia (GA); the remainder received caudal anesthesia (CA). Among the GA subjects, 25.8% remained intubated for at least 6 h after surgery, whereas none of the CA patients required intubation postoperatively (p = 0.03). Two risk factors associated with prolonged postoperative intubation: a history of intubation before surgery (p = 0.04) and a diagnosis of bronchopulmonary dysplasia (p = 0.03).

CONCLUSIONS

Neonates undergoing inguinal herniorrhaphy under GA have a greater rate of prolonged postoperative intubation compared with those undergoing CA. A history of previous intubation and bronchopulmonary dysplasia were significant risk factors for prolonged postoperative intubation.

Intubation Related Laryngeal Injuries in Pediatric Population

Introduction: Laryngeal intubation related lesions (LIRL) in pediatric patients cause extreme morbidity in both elective and emergency settings. It has a wide range of presentations from minor laryngeal edema to a life-threatening airway obstruction. We report here our units' experience with LIRL in neonates, infants, and small children. Material and Methods: This is a retrospective monocentric cohort study between January 2013 and April 2019. Results: Thirty-nine patients with intubation lesions were included in the study. We looked at the lesions type, characteristics, management, and outcome. Half the patients were premature and having comorbidities. Main LIRL were subglottic stenosis (31%), ulcers (26%), granulations (18%), retention cysts (18%), posterior glottic stenosis (13%), and vocal cords edema (5%). Unfavorable lesions causing airway stenosis were associated with an intubation duration of over 1 week and were an important factor in causing airway stenosis (p < 0.05). The endoscopic treatment performed for these lesions was lesion and anatomical site-specific. Tracheostomy was needed in five patients, and was avoided in another two. Seven patients (18%) received open surgery prior to their decannulation. Conclusions: LIRL management is challenging and stressful in the pediatric population and optimal treatment could avoid extreme morbidity in them. Intubation duration and associated comorbidities are important factors in deciding the severity of these lesions. Protocols to prevent the formation of these lesions are critical.

Novel expandable architected breathing tube for improving airway securement in emergency care

Life-saving interventions utilize endotracheal intubation to secure a patient's airway, but performance of the clinical standard of care endotracheal tube (ETT) is inadequate. For instance, in the current COVID-19 crisis, patients can expect prolonged intubation. This protracted intubation may produce health complications such as tracheal stenosis, pneumonia, and necrosis of tracheal tissue, as current ETTs are not designed for extended use. In this work, we propose an improved ETT design that seeks to overcome these limitations by utilizing unique geometries which enable a novel expanding cylinder. The mechanism provides a better distribution of the contact forces between the ETT and the trachea, which should enhance patient tolerability. Results show that at full expansion, our new ETT exerts pressures in a silicone tracheal phantom well within the recommended standard of care. Also, preliminary manikin tests demonstrated that the new ETT can deliver similar performance in terms of air pressure and air volume when compared with the current gold standard ETT. The potential benefits of this new architected ETT are threefold, by limiting exposure of healthcare providers to patient pathogens through streamlining the intubation process, reducing downstream complications, and eliminating the need of multiple size ETT as one architected ETT fits all.

The direct laryngoscopy and rigid bronchoscopy findings and the subsequent management of infants with failed extubations

INTRODUCTION

There is limited data regarding the role of direct laryngoscopy and rigid bronchoscopy (DLRB) in infants with failed extubations. Pediatric otolaryngologists are frequently consulted to perform DLRB in infants with failed extubations.

OBJECTIVE

To determine the DLRB findings in infants with failed extubations and the interventions performed based on these findings.

METHODS

A retrospective chart review was performed on infants less than 12 months old undergoing DLRB for failed extubations from January 2013-June 2017 at a tertiary care children's hospital. Data was collected on age, birth weight, perinatal complications, comorbid conditions, number of failed extubations, length of most recent intubation, operative findings, and subsequent interventions, including tracheostomy. Descriptive and comparative analyses were performed.

RESULTS

Of the 62 subjects who met study criteria, median age at DLRB was 3.0 months, corrected age was 1.0 months, gestational age was 27.1 weeks, birth weight was 0.97 kg, and number of failed extubations was 2.0. About 80% had respiratory distress at birth requiring intubation, and 76% carried a diagnosis of bronchopulmonary dysplasia (BPD). The median number of days intubated prior to DLRB was 27. Twenty-seven percent of subjects had no significant abnormal findings on DLRB, and 26% had subglottic stenosis. The majority (74%) underwent tracheostomy. Eighteen percent of subjects had an initial intervention for abnormal DLRB finding(s) other than tracheostomy and were able to avoid tracheostomy as a future intervention. Tracheostomy placement was associated with a diagnosis of BPD (RR 1.78, 95% CI 1.02, 3.10), having a birth weight less than 0.71 kg (RR 1.45, CI 1.01, 2.10), and being intubated for 48 or more days prior to DLRB (RR 1.57, 95% CI 1.05, 2.36); it was not associated with the number of failed extubations prior to DLRB.

CONCLUSIONS

Infants with failed extubations commonly had abnormal findings on airway evaluation by DLRB. Most children in this population still required tracheostomy placement, but about 20% were able to have an alternate intervention and avoid tracheostomy.

Predictors of the need for tracheostomy in the neonatal intensive care unit

OBJECTIVES

Many infants in the neonatal intensive care unit (NICU) require prolonged periods of respiratory support. Microlaryngoscopy and bronchoscopy (MLB) is performed to evaluate for airway pathology and facilitate decision-making regarding further airway interventions or tracheostomy. The objectives of this study are to describe the operative findings of MLB performed on infants in the NICU and determine which pre-operative characteristics or operative findings are predictive of the need for tracheostomy.

METHODS

The medical records of preterm inpatients in the NICU at a single tertiary care hospital who underwent MLB between January 1, 2013 and January 7, 2016 were reviewed. Baseline and demographic characteristics and intra-operative findings were compared between patients who underwent tracheostomy and those who were successfully weaned from respiratory support.

RESULTS

Seventy-three preterm patients underwent MLB for respiratory failure, of whom 41 (56.2%) underwent tracheostomy. Patients who underwent tracheostomy had lower mean gestational age (27.4 vs. 30.5 weeks), higher prevalence of bronchopulmonary dysplasia (73.2% vs. 37.5%), lower mean birth weight (1.1 kg vs. 1.6 kg), and a greater number of extubation events (5.2 vs. 3.0) than those who weaned from respiratory support. Abnormal MLB findings were common in both groups, though no single MLB finding differed significantly between groups.

CONCLUSIONS

Preterm infants in the NICU with gestational age ≤30 weeks, birth weight <1.5 kg, severe pulmonary disease, and who have failed more than 3 extubation attempts are more likely to require tracheostomy.

Caudal and Intravenous Anesthesia Without Airway Instrumentation for Laparoscopic Inguinal Hernia Repair in Infants: A Case Series

We report a series of 20 neonates and infants (18 born preterm) who underwent laparoscopic inguinal hernia repair with caudal anesthesia, oxygen via nasal cannula, and intravenous anesthesia. Surgery was successful in all cases without airway instrumentation or intraoperative complications. Sedation was provided with dexmedetomidine, propofol, and remifentanil. Two patients had apnea in the following 24 hours. There were no unplanned intensive care admissions. Laparoscopy allowed unplanned bilateral repair in 2 cases. Caudal with intravenous anesthesia without airway instrumentation is a viable technique for laparoscopic inguinal hernia repair. Avoiding general endotracheal anesthesia may reduce perioperative complications and influence postoperative disposition.

Post-intubation subglottic stenosis in children: Analysis of clinical features and risk factors

BACKGROUND

Subglottic stenosis (SGS) is a complication that develops after intubation and is characterized by respiratory distress. The aim was to evaluate patients with post-intubation SGS and to discover the factors contributing to its development.

METHODS

A total of 112 patients who had a history of intubation were included. The case group consisted of 50 patients with post-extubation persistent respiratory symptoms for which flexible bronchoscopy (FOB) was conducted and showed SGS. The control group consisted of 62 patient with no post-extubation persistent respiratory symptoms, for whom FOB was not done (n = 54), and who had post-extubation persistent respiratory symptoms and underwent FOB, which did not show subglottic stenosis (n = 8).

RESULTS

No significant differences were detected related to age, gender, and gestational age. The median number of recurrent intubations was 2.5 and 3 in the case group and in control group, respectively (P = 0.14). The median duration of intubation was 20.5 days in the case group, and 6 days in the control group (P < 0.001). The Myer-Cotton classification indicated a degree of obstruction of grade 1 (mild) in 30% (n = 15), grade 2 in 16% (n = 8), grade 3 in 48% (n = 24), and grade 4 in 6% (n = 3) of the case group.

CONCLUSION

The duration of intubation was found to be a significant risk factor for SGS development. Age at intubation, gender, gestational age, indication of intubation, and the number of recurrent intubations were found to have no significant association. Patients with post-extubation persistent respiratory problems, especially those with prolonged intubations, should be evaluated for SGS.

Benefits of spinal anesthesia for urologic surgery in the youngest of patients

INTRODUCTION

Increasing concerns regarding potential negative effects of early use of inhalational and intravenous anesthetics on neurocognitive development have led to a growing interest in alternative forms of anesthesia in infants. The study institution's outcomes with spinal anesthesia (SA) for urologic surgery in infants aged less than 90 days are reported and their outcomes with a matched cohort of patients who underwent general anesthesia (GA) are compared.

METHODS

This is a retrospective single-center analysis. Patients aged less than 90 days who underwent SA for four urologic surgeries (inguinal hernia repair, scrotal exploration, posterior urethral valve ablation, and ureterocele puncture) were identified from the study institution's SA database. An age- and procedure-matched control cohort was identified from a list of patients who underwent the aforementioned four procedures under GA since 2013. Outcomes of interest included success rate of SA, complications from spinal placement, narcotic use, need for supplemental medications and oxygen, and length of hospital stay.

RESULTS

Forty patients were identified; 20 in the SA and 20 in the GA group. Mean patient age was 54 (standard deviation, 35) days. There were no significant differences between the groups in age, gender, weight, history of prematurity, or presence of comorbidities. Eighty percent of SA patients had successful SA; reasons for conversion to GA included failure of spinal needle placement (75%) and agitation during operative procedure (25%). Ninety-six percent of patients who received GA (primarily or converted) had an endotracheal tube (ETT) placed. No patient in the SA group had a complication from spinal needle placement. Patients in the SA group were less likely to receive narcotics during the operative procedure (P = 0.001) and also had a lower mean morphine equivalent dose/kilogram (P = 0.002). Patients in the SA group were also less likely to receive any supplemental medications during the operative procedure (P = 0.001), particularly intravenous corticosteroids (P < 0.001). There were no significant differences in the length of hospital stay.

CONCLUSIONS

The use of SA has clear advantages for this medically vulnerable population. For the majority of patients, it obviates the need for ETT placement and airway management and avoids the potential negative effects of GA on neurocognitive development. It also decreases the use of narcotics and other supplemental medications. In scenarios in which the benefit of surgery must be weighed against the risk of GA, such as neonatal torsion, SA may allow a paradigm shift in the timing of surgery.

Pediatric acquired subglottic stenosis: Associated costs and comorbidities of 7,981 hospitalizations

OBJECTIVES

Numerous risk factors have been characterized for acquired subglottic stenosis (ASGS) in the pediatric population. This analysis explores the comorbidities of hospitalized ASGS patients in the United States and associated costs and length of stay (LOS).

METHODS

A retrospective analysis of the Kids' Inpatient Database (KID) from 2009 to 2012 for inpatients ≤ 20 years of age who were diagnosed with ASGS. International Classification of Diseases, Clinical Modification, Version 9 diagnosis codes were used to extract diagnoses of interest from 14, 045, 425 weighted discharges across 4179 hospitals in the United States. An algorithm was created to identify the most common co-diagnoses and subsequently evaluated for total charges and LOS.

RESULTS

ASGS was found in 7981 (0.06%) of total discharges. The mean LOS in discharges with ASGS is 13.11 days while the mean total charge in discharges with ASGS is $114,625; these values are significantly greater in discharges with ASGS than discharges without ASGS. Patients with ASGS have greater odds of being co-diagnosed with gastroesophageal reflux, Trisomy 21, other upper airway anomalies and asthma, while they have lower odds of being diagnosed with prematurity and dehydration. Aside from Trisomy 21 and asthma, hospitalizations of ASGS patients with the aforementioned comorbidities incurred a greater LOS and mean total charge.

CONCLUSION

Our analysis identifies numerous comorbidities in children with ASGS that are associated with increased resource utilization amongst US hospitalizations. The practicing otolaryngologist should continue to advocate interdisciplinary care and be aware of the need for future controlled studies that investigate the management of such comorbidities.

Comparison of GlideScope Video Laryngoscopy and Direct Laryngoscopy for Tracheal Intubation in Neonates

BACKGROUND

GlideScope video laryngoscope (GS) has been widely used to facilitate tracheal intubation in adults and pediatric patients because it can improve glottic view. Several investigations performed in pediatric patients have shown that GS provides a better view of the glottis than direct laryngoscope (DL). However, to date, there are no studies assessing the use of GS in neonates. Therefore, we conducted a prospective study to compare time to intubate (TTI) when either GS or DL was used for endotracheal intubation in neonates.

METHODS

Seventy neonates (American Society of Anesthesiologists physical status I and II, scheduled to undergo elective surgery under general anesthesia) were randomized to GS group (n = 35) and DL group (n = 35). The primary outcome variable of the study was TTI. As secondary outcomes, success rate of first intubation attempt of all neonates, intubation attempts, and adverse events were also evaluated. The glottic views (depicted by Cormack and Lehane [C&L] grades) obtained with GS and DL were compared.

RESULTS

There were no significant differences in TTIs of neonates with all C&L grades (95% CI, -7.36 to 4.44). There was also no difference in the subgroups of neonates with C&L grades I and II (n = 30 each; 95% CI, -0.51 to 5.04). However, GS significantly shortened the TTIs of neonates with C&L grades III and IV compared to DL (n = 5 each group; 95% CI, 4.94-46.67). GS improved the glottic view as compared to DL. Although the total tracheal intubation attempts in the GS group was fewer than that in the DL group (36 vs 41), there was no significant difference (P = .19).

CONCLUSIONS

GS use did not decrease the TTI of all neonates and neonates with C&L grades I and II as compared to DL use; however, GS significantly decreased the TTI of neonates with C&L grades III and IV. Additionally, GS use provided improved glottic views.

A 12-year-experience with tracheostomy for neonates and infants in northern Taiwan: Indications, hospital courses, and long-term outcomes

BACKGROUND

Tracheostomy is a valuable procedure in infants and neonates with chronic respiratory failure or severe airway obstruction. The aim of this study is to identify the indication, hospital course, and long-term outcome in a cohort of infants who required tracheostomy in a neonatal and pediatric tertiary care center in northern Taiwan.

METHODS

Medical records of infants, who underwent tracheostomy between January 2002 and December 2013, were retrospectively reviewed. Demographics, indication for tracheostomy, hospital course, discharge disposition, further hospitalization and surgery, and long-term outcome data were collected.

RESULTS

Fifty-six patients were enrolled. The median gestational age was 38.0 weeks, and median birth weight was 2770 g. he median age at tracheostomy was 104.5 days. The primary indications for tracheostomy were airway obstruction in 35 patients (62.5%), craniofacial anomalies in 7 (12.5%), neuromuscular disorder in 7 (12.5%), cardiopulmonary disorder in 5 (8.9%), and brain injury-related problem in 2 (3.6%). Twenty-two patients (39.3%) were decannulated successfully, and the median time from tracheostomy to decannulation was 2.1 years. Overall mortality rate was 3.6%, but no death was related to tracheostomy. Forty-nine patients underwent regular follow-up at our hospital, and 46 patients (93.9%) required further hospitalization, and 30 (61.2%) underwent further surgery related to a respiratory problem or tracheostomy. Ratio of delayed growth at the time of tracheostomy (28.6%) did not have significant difference at 1 year of age (21.4%) and 2 years of age (25.0%).

CONCLUSION

In this study, the most common indication for tracheostomy in neonates and infants was airway obstruction. Excluding patients with neuromuscular diseases, a successful decannulation rate of >50% can be achieved.

Orotracheal intubation in infants performed with a stylet versus without a stylet

BACKGROUND

Neonatal endotracheal intubation is a common and potentially life-saving intervention. It is a mandatory skill for neonatal trainees, but one that is difficult to master and maintain. Intubation opportunities for trainees are decreasing and success rates are subsequently falling. Use of a stylet may aid intubation and improve success. However, the potential for associated harm must be considered.

OBJECTIVES

To compare the benefits and harms of neonatal orotracheal intubation with a stylet versus neonatal orotracheal intubation without a stylet.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL) in the Cochrane Library; MEDLINE; Embase; the Cumulative Index to Nursing and Allied Health Literature (CINAHL), and previous reviews. We also searched cross-references, contacted expert informants, handsearched journals, and looked at conference proceedings. We searched clinical trials registries for current and recently completed trials. We conducted our most recent search in April 2017.

SELECTION CRITERIA

All randomised, quasi-randomised, and cluster-randomised controlled trials comparing use versus non-use of a stylet in neonatal orotracheal intubation.

DATA COLLECTION AND ANALYSIS

Two review authors independently assessed results of searches against predetermined criteria for inclusion, assessed risk of bias, and extracted data. We used the standard methods of the Cochrane Collaboration, as documented in the Cochrane Handbook for Systemic Reviews of Interventions, and of the Cochrane Neonatal Review Group.

MAIN RESULTS

We included a single-centre non-blinded randomised controlled trial that reported a total of 302 intubation attempts in 232 infants. The median gestational age of enrolled infants was 29 weeks. Paediatric residents and fellows performed the intubations. We judged the study to be at low risk of bias overall. Investigators compared success rates of first-attempt intubation with and without use of a stylet and reported success rates as similar between stylet and no-stylet groups (57% and 53%) (P = 0.47). Success rates did not differ between groups in subgroup analyses by provider level of training and infant weight. Results showed no differences in secondary review outcomes, including duration of intubation, number of attempts, participant instability during the procedure, and local airway trauma. Only 25% of all intubations took less than 30 seconds to perform. Study authors did not report neonatal morbidity nor mortality. We considered the quality of evidence as low on GRADE analysis, given that we identified only one unblinded study.

AUTHORS' CONCLUSIONS

Current available evidence suggests that use of a stylet during neonatal orotracheal intubation does not significantly improve the success rate among paediatric trainees. However, only one brand of stylet and one brand of endotracheal tube have been tested, and researchers performed all intubations on infants in a hospital setting. Therefore, our results cannot be generalised beyond these limitations.

Diagnosis of subglottic stenosis in a rabbit model using long-range optical coherence tomography

OBJECTIVES/HYPOTHESIS

Current imaging modalities lack the necessary resolution to diagnose subglottic stenosis. The aim of this study was to use optical coherence tomography (OCT) to evaluate nascent subglottic mucosal injury and characterize mucosal thickness and structural changes using texture analysis in a simulated intubation rabbit model.

STUDY DESIGN

Prospective animal study in rabbits.

METHODS

Three-centimeter-long sections of endotracheal tubes (ETT) were endoscopically placed in the subglottis and proximal trachea of New Zealand White rabbits (n = 10) and secured via suture. OCT imaging and conventional endoscopic video was performed just prior to ETT segment placement (day 0), immediately after tube removal (day 7), and 1 week later (day 14). OCT images were analyzed for airway wall thickness and textural properties.

RESULTS

Endoscopy and histology of intubated rabbits showed a range of normal to edematous tissue, which correlated with OCT images. The mean airway mucosal wall thickness measured using OCT was 336.4 μm (day 0), 391.3 μm (day 7), and 420.4 μm (day 14), with significant differences between day 0 and day 14 (P = .002). Significance was found for correlation and homogeneity texture features across all time points (P < .05).

CONCLUSIONS

OCT is a minimally invasive endoscopic imaging modality capable of monitoring progression of subglottic mucosal injury. This study is the first to evaluate mucosal injury during simulated intubation using serial OCT imaging and texture analysis. OCT and texture analysis have the potential for early detection of subglottic mucosal injury, which could lead to better management of the neonatal airway and limit the progression to stenosis.

LEVEL OF EVIDENCE

NA Laryngoscope, 127:64-69, 2017.

Airway damage of prematurity: The impact of prolonged intubation, ventilation, and chronic lung disease

Over the past four decades, advances in neonatal intensive care have led to the survival of smaller and more immature infants. The improved survival of very low birth weight infants is associated with long term respiratory morbidity, most frequently in the form of bronchopulmonary dysplasia. In this review, we will discuss the pathogenesis, risk factor as well as management of commonly seen acquired airway disorders associated with prematurity, prolonged intubation and ventilation.

Cuffed endotracheal tubes in neonates and infants undergoing cardiac surgery are not associated with airway complications

STUDY OBJECTIVE

To determine the incidence of postoperative airway complications in infants <5kg in weight undergoing cardiac surgery intubated with Microcuff (Kimberley-Clark, Roswell, GA) endotracheal tubes (ETTs).

DESIGN

Retrospective review of infants weighing <5.0 kg with congenital heart disease (CHD) presenting for cardiac surgery.

SETTING

Single-center, tertiary pediatric cardiac critical care unit at a university hospital.

PATIENTS

A total of 208 infants weighing <5 kg underwent cardiac surgery for CHD from 2008 to 2013.

INTERVENTION

Intubation with Microcuff (Kimberley-Clark) ETTs.

STUDY DESIGN

Retrospective review of infants weighing <5.0 kg with CHD presenting for cardiac surgery to a single-center tertiary care university hospital.

MEASUREMENTS

Perioperative data were collected. Primary outcome was development of tracheal stenosis and/or reintubation for stridor. Stridor was defined as mild (≤2 doses of racemic epinephrine), moderate (>2 doses of racemic epinephrine), or severe (requiring reintubation). Secondary outcomes were variables possibly contributing to postextubation stridor. Infants with a tracheostomy, airway anomalies, and death prior to initial extubation were excluded. Logistic regression analysis was performed to evaluate the association between clinical risk factors and the incidence of postextubation stridor.

RESULTS

A total of 208 infants weighing <5 kg underwent cardiac surgery for CHD from 2008 to 2013; 12 subjects were excluded for death prior to initial extubation. No infant developed tracheal stenosis. The incidence of any stridor was 20.9% (95% confidence interval, 15.8%-27.1%) with severe stridor in 2 cases (1%). Age at surgery, weight, duration of intubation, dexamethasone use, and ETT size were not significantly associated with postextubation stridor. Presence of a comorbidity was significantly associated with stridor (P=.01).

CONCLUSIONS

Microcuff ETTs in infants <5.0 kg in weight undergoing cardiac surgery are associated with a low incidence of severe postextubation stridor. Because cuffed ETTs allow for improved control of ventilation/oxygenation and decreased risk of aspiration, they should be considered for use in this high-risk population. Larger studies are needed to confirm these results.

Cuff-leak test combined with interventional bronchoscopy benefits early extubation for patients who received tarp surgery

PURPOSE

This study explored the performance characteristics of a cuff-leak test (CLT) combined with interventional fiberoptic bronchoscopy (FBS) for evaluating whether early nasoendotracheal extubation was possible for patients who had received transoral atlantoaxial reduction plate (TARP) internal fixation surgery.

METHODS

318 patients who underwent surgery were retrospectively analyzed (between January 2006 and December 2012). Extubation was performed by conventional approach (CA group, until December 2008) and improved approach (IA group, from January 2009) including CLT and an interventional FBS procedure. The extubation success within 1-3 days after surgery, incidence of postextubation stridor and tracheal reintubation were examined.

RESULTS

More IA-treated patients experienced extubation during the first 2 days than those CA-treated, median extubation time was 3 (2, 3) days in the CA group and 2 (1, 2) days in the IA group (all P < 0.01). The incidence of stridor and reintubation was 5.69 and 0.57 % in IA and 11.98 and 4.93 % in CA, respectively (both P < 0.05). For the CLT-positive patients in the IA group that remained intubated until day 3-4, interventional FBS was applied for safe extubation and achieved 100 % success.

CONCLUSION

Early extubation through IA is safe and interventional FBS assists successful extubation for CLT-positive patients who underwent TARP surgery.

Traumatic tracheal injury in children: a case series supporting conservative management

OBJECTIVES

Injuries to the tracheobronchial region are rare, but have the potential for rapid progression and can become life-threatening. Etiologies of non-penetrating tracheobronchial injuries include blunt cervical trauma, endotracheal intubation, and other iatrogenic causes. Several options for treatment ranging from conservative to surgical exist, but no single treatment has been implemented with consensus. While early surgical repair was once considered the cornerstone of therapy, evidence supporting conservative treatment continues to gain strength.

METHODS

All pediatric patients who suffered from non-penetrating injuries to the tracheobronchial tree who were treated by the Otolaryngology Service at a tertiary children's hospital from May 2012 through March 2014 were recorded. A total of 8 patients were identified. The cases were collected from the patients treated by the Otolaryngology Department based on retrospective review. The available electronic medical records were reviewed for each patient. Data including type of injury, endoscopic assessment of injury, treatment received, and follow-up were collected.

RESULTS

The ages ranged from 2 to 15 years old, with a mean of 9.25 years old. Six of the eight patients had injuries related to endotracheal intubation. Each patient was taken to the operating suite for diagnostic direct laryngoscopy and bronchoscopy, and treated with initial conservative management. All but one of the patients was treated with endotracheal intubation, and the average length of intubation was 11.71 days. All of the injuries healed spontaneously without requiring initial open surgery. Five patients (62.5%) developed some degree of tracheal stenosis. Three patients (37.5%) required further surgery; one received a tracheostomy and two patients required balloon dilation.

CONCLUSIONS

This case series is the largest to date documenting the outcomes of conservative treatment of non-penetrating traumatic tracheal injuries in children. By using initial conservative therapy, we were able to avoid open surgical procedures in many of our patients. We believe that this case series provides further support for conservative management for children with tracheobronchial injuries.

Long-range Fourier domain optical coherence tomography of the pediatric subglottis

BACKGROUND

Acquired subglottic stenosis (SGS) most commonly results from prolonged endotracheal intubation and is a diagnostic challenge in the intubated child. At present, no imaging modality allows for in vivo characterization of subglottic microanatomy to identify early signs of acquired SGS while the child remains intubated. Fourier domain optical coherence tomography (FD-OCT) is a minimally invasive, light-based imaging modality which provides high resolution, three dimensional (3D) cross-sectional images of biological tissue. We used long-range FD-OCT to image the subglottis in intubated pediatric patients undergoing minor head and neck surgical procedures in the operating room.

METHODS

A long-range FD-OCT system and rotary optical probes (1.2mm and 0.7mm outer diameters) were constructed. Forty-six pediatric patients (ages 2-16 years) undergoing minor upper airway surgery (e.g., tonsillectomy and adenoidectomy) were selected for intraoperative, trans-endotracheal tube FD-OCT of the subglottis. Images were analyzed for anatomical landmarks and subepithelial histology. Volumetric image sets were rendered into virtual 3D airway models in Mimics software.

RESULTS

FD-OCT was performed on 46 patients (ages 2-16 years) with no complications. Gross airway contour was visible on all 46 data sets. Twenty (43%) high-quality data sets clearly demonstrated airway anatomy (e.g., tracheal rings, cricoid and vocal folds) and layered microanatomy of the mucosa (e.g., epithelium, basement membrane and lamina propria). The remaining 26 data sets were discarded due to artifact, high signal-to-noise ratio or missing data. 3D airway models were allowed for user-controlled manipulation and multiplanar airway slicing (e.g., sagittal, coronal) for visualization of OCT data at multiple anatomic levels simultaneously.

CONCLUSIONS

Long-range FD-OCT produces high-resolution, 3D volumetric images of the pediatric subglottis. This technology offers a safe and practical means for in vivo evaluation of lower airway microanatomy in intubated pediatric patients. Ultimately, FD-OCT may be applied to serial monitoring of the neonatal subglottis in long-term intubated infants at risk for acquired SGS.

Post intubation tracheal stenosis in children

Many authors have reported that tracheal stenosis is a complication that can follow tracheal intubation in both adults and children. The symptoms, when they do appear, can be confused with asthma, with subsequent treatment providing only mild and inconsistent relief. We report here the case of an 8 year old girl admitted to our hospital for whooping cough that was not responding to therapy.

Neonatal intubation with direct laryngoscopy vs videolaryngoscopy: an extremely premature baboon model

OBJECTIVE

To compare the ability to successfully intubate extremely preterm baboons using conventional direct laryngoscopy (DL) vs videolaryngoscopy.

METHODS

A prospective randomized crossover study using experienced and inexperienced neonatal intubators. All participants were shown an educational video on intubation with each device, followed by attempt of the procedure. The time for successful intubation was the primary outcome.

RESULTS

Seven subjects comprised the experienced group, while 10 individuals were in the inexperienced group. The overall intubation success rate was comparable between both devices (53% vs 26%, P = 0.09); however, mean time to intubate with the conventional laryngoscope was faster (25.5 vs 39.4 s, P = 0.02). Although both groups intubated faster with DL, it only reached statistical significance in the inexperienced group (27.0 vs 48.7 s, P < 0.05).

CONCLUSION

Conventional DL and videolaryngoscopy are suitable modes for intubating extremely preterm baboons. Although experienced intubators prefer DL, intubation success rate and time to intubate with both devices were comparable. In inexperienced intubators, participants preferred and intubated faster with DL.

Cervical emphysema: an unusual presentation of laryngeal cancer

BACKGROUND

Acute respiratory decompensation can occur on a background of slowly progressive airway compromise, for example in laryngeal squamous cell cancer. Surgeons in ENT, together with anaesthetists, are often asked to evaluate airway risk and as yet there is no widely adopted standardised approach.

CASE REPORT

This paper reports the case of an 82-year-old male, who presented with acute airway compromise due to both endolaryngeal obstruction from a squamous cell cancer and extralaryngeal compression from massive subcutaneous emphysema.

RESULTS

Primary total laryngectomy was performed, but the patient declined adjuvant radiotherapy. He died a year later from a heart attack without evidence of recurrence.

CONCLUSION

To the best of our knowledge, this is the first case report of acute airway compromise from extralaryngeal subcutaneous emphysema secondary to laryngeal cancer. Options for acute airway management are discussed.

Successful Surgical Management of Airway Perforation in Preterm Infants

Traumatic airway perforation during endotracheal intubation is an uncommon but life-threatening complication in preterm infants. Death usually occurs at the time of the injury, but in rare cases where the infant survives the initial resuscitation, therapeutic options include conservative versus surgical management. We describe three cases of airway perforation treated successfully with surgical intervention and without lung resection, utilizing novel graft material and cardiopulmonary bypass to facilitate repair. In preterm infants who survive the initial injury we advocate for early identification and surgical management with cardiopulmonary bypass when feasible.

Post-intubation subglottic stenosis in children. Diagnosis, treatment and prevention of moderate and severe stenosis

INTRODUCTION AND OBJECTIVES

Subglottic stenosis is one of the most common causes of upper airway obstruction. Almost 90% of them result from endotracheal intubation. Therapy depends on the degree of stenosis, among other factors. Therapeutic approaches range from watchful waiting, in mild stenosis, to complex surgery for severe cases. We report our experience on the surgical management of post-intubation subglottic stenosis in children, emphasising the need for recognition and prevention of predisposing factors of post-intubation stenosis.

METHODS

We retrospectively evaluated 71 patients with moderate to severe post-intubation subglottic stenosis, operated in the Respiratory Endoscopy Service in a period of eight years. The clinical variables analysed were age at surgery, degree of stenosis, surgical technique, complications and outcome.

RESULTS

In 84.5% of patients, only 1 surgical approach was required to achieve decannulation. Three surgical techniques were implemented as therapy: laryngotracheal reconstruction, partial cricotracheal resection and anterior cricoid split. Decannulation was achieved in 70 cases. In 71.8%, ventilation, swallowing and voice qualities were good; 23.9% presented dysphonia; and 2.8% presented a mild respiratory distress. One patient died.

CONCLUSION

In patients with subglottic stenosis, selection of the most accurate treatment is the key to success, reducing the number of surgeries and preventing complications.

A simple mechanical device reduces subglottic injury in ventilated animals

OBJECTIVES/HYPOTHESIS

To test whether a simple inexpensive device that dynamically minimizes endotracheal cuff pressure throughout the respiratory cycle reduces endotracheal cuff pressure-related subglottic injury.

STUDY DESIGN

Hypoxic animal model with one control and one experimental group.

METHODS

Twelve S. scrofa domesticus piglets (14-16 kg) were intubated with standard endotracheal tubes and maintained in a hypoxic state to accelerate airway injury. Animals in the control group (n = 6) were ventilated with a constant pressure of 20 cm H₂O in the endotracheal tube cuff. Animals in the experimental group (n = 6) were ventilated using a custom-designed circuit that altered the pressure in the endotracheal tube cuff in synchrony with the ventilatory cycle. Larynges were harvested at the end of the experiment and examined histologically to determine the degree of airway injury induced by the endotracheal cuff.

RESULTS

Animals in the experimental group suffered significantly less airway damage than those in the control group. The differences were seen primarily in the subglottis (aggregate damage score 6.5 vs. 12, P <0.05), where the experimental endotracheal tube cuff exerted the least pressure. There was no difference in damage to the glottic or supraglottic structures.

CONCLUSIONS

A simple, reliable, and inexpensive means of modulating endotracheal tube cuff pressure with the ventilatory cycle led to a substantial decrease in airway injury in our animal model. Such reduction in cuff pressure may prove important for humans, particularly those in intensive care units who tend to have underlying conditions predisposing them to tracheal damage from the endotracheal tube cuff.

Subglottic injury: a clinically relevant animal model

OBJECTIVES/HYPOTHESIS

To develop a clinically aligned, reproducible model for subglottic injury.

STUDY DESIGN

Prospective randomized control pilot study.

METHODS

Juvenile (3-month-old) New Zealand White rabbits underwent intubation with a 3-cm length of an endotracheal tube that was chosen so that there would be no air leak below 20 cm of water. This tube was one or two sizes above the appropriate tube for the animal. It was held in situ with a suture placed at the trachea and secured over a button in the neck for a period of 1 week. Animals were sacrificed 1 week postextubation, and larynges were harvested. A range of histological techniques and gross morphology were utilized to examine the injury caused at the level of the subglottis. Unintubated animals constituted controlled specimens.

RESULTS

Intubated animals demonstrated considerable histopathology including evidence of ulceration, inflammation, granulation tissue, perichondritis, and chondritis when compared with control animals. Morphometric analysis demonstrated a significant increase in lamina propria thickness (P = .0013), mucosal thickness (P ≤ .0001), and in goblet cell areal density (P = .014). Analysis of mucin types found a significant decrease in acidic (P = .0001) mucin coinciding with a significant increase in mixed mucin types (P = .0013).

CONCLUSIONS

Our model provides a reliable and reproducible technique for acute/subacute injury to the subglottis secondary to intubation, which is consistent with previous histological findings of early changes associated with acquired subglottic stenosis (SGS). Future uses of this model could include the examination of current adjunctive therapies and their effects on limiting progression to SGS.