Performance of custom made videolaryngoscope for endotracheal intubation: A systematic review

Introduction Videolaryngoscope is regarded as the standard of care for airway management in well-resourced setups however the technology is largely inaccessible and costly in middle and low-income countries. An improvised and cost-effective form of customized videolaryngoscope was proposed and studied for patient care in underprivileged areas however there were no distinct conclusions on its performances. Method The study follows PRISMA guidelines for systematic review and the protocol in International Prospective Register for Systematic Reviews. The primary aim was to assess the first attempt success of customized videolaryngoscope for endotracheal intubation. The secondary objective was to evaluate the number of attempts, laryngoscopic view in terms of Cormack Lehane score and Percentage of glottic opening, use of external laryngeal maneuver and stylet and, the airway injuries after the endotracheal intubation. Result Five studies were analyzed for risk of bias using the National Institute of Health Quality Assessment Tool for cross-sectional studies. Most of the studies had a poor to a fair level of evidence with only one study with a good level of evidence. Certainty of evidence was “very low” for all eligible studies when graded using the Grading of Recommendation, Assessment, Development and Evaluation approach for systematic review. Conclusions The certainty of the evidence regarding performance of custom-made videolaryngoscope compared to conventional laryngoscope was very low and the study was performed in small numbers with fair to the poor risk of bias. It was difficult to establish and do further analysis regarding whether the customized form of videolaryngoscope will improve the first attempt success rate for tracheal intubation, reduce the number of attempts, improve the laryngoscopic view, require fewer external aids and reduce the incidences of airway injury with the given low-grade evidence. Some properly conducted randomised clinical trials will be required to further analyze the outcome and make the strong recommendations.

Non-intubated Thoracoscopic Surgery—Pros and Cons

Pulmonary resection by video-assisted thoracoscopic surgery with single-lung ventilation has become a standardized modality over the last decades. With the aim to reduce surgical stress during operation procedures, some have adopted a uniportal approach in pulmonary resection as an alternative to multiportal VATS. The ERAS program has been widely spread to achieve even better outcomes. In 2004, Pompeo reported the resection of pulmonary modules by conventional VATS under intravenous anesthesia without endotracheal intubation. Within less than a decade thereafter, complete VATS pulmonary resections under anesthesia without endotracheal intubation had been reported for a range of thoracoscopic procedures. Avoiding tracheal intubation under general anesthesia can reduce the incidence of complications such as intubation-related airway trauma, residual neuromuscular blockade, ventilation-induced lung injury, impaired cardiac performance, and postoperative nausea. Numerous studies can be found especially from Asian countries, focusing on comparison of intubated and non-intubated procedures showing that non-intubated VATS could reduce the rate of postoperative complications, shorten hospital stay and decrease the perioperative mortality rate, indicating that non-intubated VATS is a safe, effective and feasible technique for thoracic disease. However, if we look closely at all studies, it is obvious that there are no significant differences between intubated and non-intubated surgery in terms of the standard procedures and maneuvers. In non-intubated procedures it can be less comfortable for the surgeon to manipulate in the thoracic cavity, but the procedural steps remain the same. All the differences between the intubated and non-intubated operation procedure are found in perioperative management of the patient. The patient is still in deep anesthesia during the procedure and hypecapnia can occur. It is easier to manage this if the patient is intubated. In addition, if a complication occurs during the operation and intubation is required, this can cause an emergent situation, which means that not all patients are suitable for such a procedure, especially those with severe emphysema, obese patients and those with a problematic oropharyngeal configuration-Mallampati score. Moreover, studies on non-intubated thoracic surgery point to shortened hospitalization, faster recovery etc. But there are also studies on intubated uniportal VATS procedures in combination with ERAS protocol showing shortened hospitalization and better outcome for patients. Currently, especially with the use of optical intubation canylas, totally intravenous anesthesia (TIVA), BIS and relaxometer, anesthesia is safe for avoiding airway injury, hypercapnia, and there is minimal risk of residual curarization as well as one of the postoperative lung complications such as microaspiration and atelectasis. In addition, the patient recovers rapidly from anesthesia and can be verticalised and mobilized a couple of hours after the operation. It is desirable to take into consideration what type of patient and what lung disease is suitable for non-intubated technique and what is more convenient for intubation.

Airway injury and pneumomediastinum associated with less invasive surfactant administration in a premature neonate: a case report

Background The use of less invasive surfactant administration (LISA)/minimally invasive surfactant therapy (MIST) has increased due to its potential advantage over traditional surfactant delivery methods through an endotracheal tube. Known complications for this procedure include failure of the first attempt at insertion, desaturation, and bradycardia. To the best of our knowledge, this is the first reported case of pneumomediastinum and subcutaneous emphysema following LISA. Case presentation A preterm newborn born at 27 weeks of gestation presented with respiratory distress syndrome requiring surfactant replacement. LISA using the Hobart method was completed. There was a report of procedural difficulty related to increased resistance to insertion of the 16G angiocath. The newborn was subsequently noted to have subcutaneous emphysema over the anterior aspect of the neck and substantial pneumomediastinum on radiological assessment. Associated complications included hypotension requiring inotropic support. The newborn was successfully managed conservatively, with complete resolution of the air leak. Conclusions Upper airway injury leading to air leak syndrome is a rare complication of the Hobart method for LISA. Awareness of such procedural complications is important as the use of the LISA method increases.

Emergency management plan for paediatric patients with tracheostomies during the COVID-19 pandemic

Objectives: Paediatric patients living with tracheostomies are a medically vulnerable group. During the COVID-19 pandemic, there may be apprehension about their susceptibility to SARS-CoV-2 infection with unknown consequences. Healthcare workers managing this cohort can be anxious about viral transmission from respiratory secretions and aerosols emerging from the open airway. Our objective is to share a systematic approach to minimise incidental mismanagement, avoid iatrogenic airway injury, reduce aerosolisation and decrease staff exposure when treating these patients. Methods: A COVID-19 emergency management plan was created for paediatric patients with tracheostomies in the event of presentation with unknown, suspected or proven SARS-CoV-2 infection. Three documents were developed: a generic tracheostomy management plan detailing troubleshooting measures to reduce air leak from around the tube; a personalised management plan with customised recommendations; a guide for tracheostomy tube change with emphasis on minimising aerosol production. Results: Our plan was distributed to 31 patients (age range 11 months - 17 years) including 23 (74.2%) with uncuffed tubes and 9 (29%) on long term ventilation. There have been 10 occasions in which the plan was utilised and influenced care, including 4 situations where successful troubleshooting avoided tube manipulation and 6 situations where an uncuffed tube was safely replaced with a pre-selected cuffed tube to reduce air leak. Conclusions: A structured approach to emergency presentations during the COVID-19 pandemic may safeguard paediatric patients from unnecessary manipulation of their tracheostomy tube and airway trauma, as well as provide guidance to minimise viral exposure and allow provision of expeditious care.

Iatrogenic esophageal perforation with mediastinitis, multidisciplinary management: a case report

Acute mediastinitis is a low incidence pathology, but it is associated with a high mortality rate. Iatrogenic lesions are the most common cause of mediastinitis secondary to esophageal perforation. Early diagnosis and surgical treatment are the most important factors in the treatment of patients with this condition. 83-year-old female patient, with a history of left saphenectomy due to venous insufficiency with difficult intubation two days prior to the emergency consultation. She was admitted to the emergency room due to dyspnea, hemoptysis, chest pain, and right hemifacial edema. A chest tomography was performed with findings suggestive of esophageal perforation or airway injury. Later, in an upper digestive tract study, extravasation of the contrast medium was documented in the right posterolateral wall of the cervical esophagus with a collection in the middle mediastinum. The patient was taken for drainage of mediastinitis by right thoracoscopy and the presence of a perforation in the cervical esophagus was confirmed with an intraoperative endoscopy. Esophageal repair was performed, with drainage of the prevertebral space and the superior mediastinum by a left longitudinal cervicotomy. Postoperatively, she received antibiotic and enteral nutritional support by a nasojejunal tube. Low output fistula of the cervical esophagus, organized by a drain, was documented, which closed after 4 weeks of conservative management. Iatrogenic esophageal perforation with mediastinitis is a very rare entity with a high mortality. Early surgical treatment is the most important prognostic factor in patients with mediastinitis due to esophageal perforation.

Converting to Intubation During Non-intubated Thoracic Surgery: Incidence, Indication, Technique, and Prevention

Traditionally, intubated general anesthesia with one-lung ventilation is standard in thoracoscopic surgery. However, in recent decades, non-intubated thoracoscopic surgery (NITS) has become an alternative method to minimize the adverse effects of intubated general anesthesia. Non-intubated procedures result in fewer adverse events than tracheal intubation and general anesthesia, such as intubation-related airway injury, ventilation-induced lung injury, prolonged hospital stay, and postoperative nausea and vomiting. Despite these benefits, surgeons must consider the possibility of converting to intubation during NITS as the conversion rate is between 2 and 11%, varying between regions and learning time. The conversion rate is also affected by race, body size, the learning curve, and the surgical team's preferred methods. There are surgical (e.g., significant respiratory movements, uncontrolled bleeding, hindered surgical fields, large tumor sizes, adhesions) and anesthetic (e.g., hypoxemia, hypercapnia, airway spasms) reasons for converting to intubation. When a conversion is deemed necessary by the surgical team, the members should be well-prepared and act rapidly. Anesthesiologists should also feel comfortable intubating patients in the lateral decubitus position with or without bronchoscopic guidance. Patient selection is the key factor for avoiding conversion into an intubated surgery. Patients with an American Society of Anesthesiologists grade 2 or less, a body mass index <25, and less surgical complexity may be good candidates for NITS. Careful monitoring, adequate anesthesia depth, an experienced surgical team, and sufficient preparation can also prevent conversion. Conversion from a non-intubated into intubated thoracic surgery is unwanted but not inevitable. Therefore, NITS can be successful when performed on select patients by a well-prepared and experienced surgical team and is worthy of recommendation owing to its non-invasiveness.

Antioxidant Properties of Hydrogen Gas Attenuates Oxidative Stress in Airway Epithelial Cells

Oxidative stress plays a crucial role in the development of airway diseases. Recently, hydrogen (H2) gas has been explored for its antioxidant properties. This study investigated the role of H2 gas in oxidative stress-induced alveolar and bronchial airway injury, where A549 and NCI-H292 cells were stimulated with hydrogen peroxide (H2O2) and lipopolysaccharide (LPS) in vitro. Results show that time-dependent administration of 2% H2 gas recovered the cells from oxidative stress. Various indicators including reactive oxygen species (ROS), nitric oxide (NO), antioxidant enzymes (catalase, glutathione peroxidase), intracellular calcium, and mitogen-activated protein kinase (MAPK) signaling pathway were examined to analyze the redox profile. The viability of A549 and NCI-H292 cells and the activity of antioxidant enzymes were reduced following induction by H2O2 and LPS but were later recovered using H2 gas. Additionally, the levels of oxidative stress markers, including ROS and NO, were elevated upon induction but were attenuated after treatment with H2 gas. Furthermore, H2 gas suppressed oxidative stress-induced MAPK activation and maintained calcium homeostasis. This study suggests that H2 gas can rescue airway epithelial cells from H2O2 and LPS-induced oxidative stress and may be a potential intervention for airway diseases.

Increased circulating cytokeratin 19 fragment levels in preterm neonates receiving mechanical ventilation are associated with poor outcome

Invasive mechanical ventilation and oxygen toxicity are postnatal contributors to chronic lung disease of prematurity, also known as bronchopulmonary dysplasia (BPD). Cyfra 21-1 is a soluble fragment of cytokeratin 19, which belongs to the cytoskeleton stabilizing epithelial intermediate filaments. As a biomarker of structural integrity, Cyfra 21-1 might be associated with airway injury and lung hypoplasia in neonates. Serum Cyfra 21-1 concentrations for 80 preterm and 80 healthy term newborns were measured within 48 hours after birth. Preterm infants with the combined endpoint BPD/mortality had significantly higher Cyfra 21-1 levels compared to those without fulfilling BPD/mortality criteria (p=0.01). Also, severe RDS (>grade III) was associated with higher Cyfra levels (p=0.01). Total duration of oxygen therapy was more than five times longer in neonates with high Cyfra 21-1 levels (p=0.01). Infants with higher Cyfra 21-1 values were more likely to receive mechanical ventilation (50% vs. 17.5%). However the duration of mechanical ventilation was similar between groups. The median Cyfra value was 1.93 ng/ml (IQR: 1.68-2.53 ng/ml) in healthy term neonates and 8.5 ng/ml (IQR: 3.6-16.0 ng/ml) in preterm infants. Using ROC analysis, we calculated a Cyfra cutoff > 8.5 ng/ml to predict BPD/death with an AUC of 0.795 (p = 0.004), a sensitivity of 88.9% and a specificity of 55%. Mortality was predicted with a cutoff > 17.4 ng/ml (AUC: 0.94; p = 0.001), a sensitivity of 100% and a specificity of 84%. These findings suggest that Cyfra 21-1 concentration might be useful to predict poor outcome in premature infants.