How design characteristics of tracheostomy tubes affect the cannula and tracheal flows

The Benefits of Silicone Laryngectomy Tubes at the Time of Laryngectomy-A Case Series Spanning 17 Years

OBJECTIVES

Although total laryngectomy (TL) is a well-established surgical procedure with clear functional or oncologic indications, the peri- and postoperative care for those undergoing TL is variable, particularly regarding postlaryngectomy tracheostoma management. This study examined TL outcomes from a single institution with the immediate perioperative use of soft silicone laryngectomy tubes. More specifically, we explored potential complications associated with immediate perioperative use of a flexible laryngectomy tube (LaryTube and StomaSoft) and the use of heat and moisture exchange (HME) devices in association with peri- and postoperative care.

METHODS

A case series including all patients undergoing TL by one primary surgeon at a tertiary care hospital between 2006 and 2023 were assessed. Variables of interest included hospital average length of stay (LOS) in hospital, use of laryngectomy tube and an HME, primary tracheoesophageal puncture voice restoration at time of TL, discharge feeding, stoma-related complications, and overall complications.

RESULTS

Seventy-two patients were included over the study period, and all utilized a laryngectomy tube and HME in the perioperative period without complications. Fifty-six patients (77.7%) had concurrent neck dissections and nine (15%) underwent total laryngopharyngectomy. Sixty-two patients (86%) underwent TL for squamous cell carcinoma of the larynx or hypopharynx and 35 of these (56%) were salvage surgeries. Mean LOS was 8.4 (3-45) days, and 63 patients (88%) were discharged with nasal gastric tube feeding. Of the six patients (8%) who were readmitted for complications, zero (0%) were related to the laryngectomy tube or to stoma-related complications (e.g., dehiscence, infection, mucous plugging). No patient who utilized a laryngectomy tube and HME device in the perioperative period experienced stomal stenosis.

CONCLUSIONS

Laryngectomy tubes combined with an HME can be employed safely and successfully in a high percentage of laryngectomy patients placed perioperative. No instances of postlaryngectomy tracheostoma stenosis occurred in association with perioperative laryngectomy tube with HME use. These collective data support the use of a laryngectomy tube with HME in the immediate perioperative period, with low risk of complications.

The Effect of Laser-Resistant Endotracheal Tube Design on Airflow Dynamics: A Benchtop and Clinical Study

OBJECTIVE

Compare ventilation pressures of 2 endotracheal tube designs used in laser airway surgery in clinical practice and with a benchtop model to elucidate differences and understand the design elements that impact airflow dynamics.

METHODS

Ventilatory and aerodynamic characteristics of the laser resistant stainless-steel endotracheal tube (LRSS-ET) design and the laser resistant aluminum-wrapped silicone endotracheal tube (LRAS-ET) design were compared. Ventilatory parameters were collected for 32 patients undergoing laser-assisted airway surgery through retrospective chart review. An in vitro benchtop simulation measured average resistance and centerline turbulence intensity of both designs at various diameters and physiological frequencies.

RESULTS

Baseline patient characteristics did not differ between the 2 groups. Clinically, the median LRAS-ET peak inspiratory pressure (PIP; 21.00 cm H2O) was significantly decreased compared to LRSS-ET PIP (34.67 cm H2O). In benchtop simulation, the average PIP of the LRAS-ET was significantly lower at all sizes and frequencies. The LRSS-ET consistently demonstrated an increased resistance, although no patterns were observed in turbulence intensity data between both designs.

CONCLUSION

The benchtop model demonstrated increased resistance in the LRSS-ET compared to the LRAS-ET at all comparable sizes. This finding is supported by retrospective ventilatory pressures during laser airway surgery, which show significantly increased PIPs when comparing identically sized inner diameters. Given the equivocal turbulence intensity data, these differences in resistance and pressures are likely caused by wall roughness and intraluminal presence of tubing, not inlet or outlet geometries. The decreased PIPs of the LRAS-ET should assist in following lung protective ventilator management strategies and reduce risk of pulmonary injury and hemodynamic instability to the patient.

The impact of endotracheal intubation on oxygen delivery, trachea pressure and wall deformation

This paper concerns improving endotracheal tube (ETT) insertion through advanced computational science modelling. The study aims to better understand endotracheal intubation (ETI) and reduce medical errors in intensive and critical care units since ETT insertion is unique for each patient, depending on age, gender, size, physiology, and underlying health conditions. We have employed computational fluid dynamics and biomechanics modelling to investigate the effect of ETT for three ventilation modes on (a) local oxygen delivery to the lungs, (b) air pressure and wall shear stress at the tracheal walls, and (c) oscillatory elastic deformation of the tracheal tissues and muscle. For the first time, we reveal how the ventilation mode and ETT insertion in the trachea may induce major complications, especially in long periods of ETT. We show that rotating the ETT or displacing it by 2 mm only can induce a significant rise in the tracheal pressure up to 177 cmH2O. This study, for the first time, shows the vital role of computers in biology and medicine to provide enhanced decision-making-support to clinicians and medical doctors dealing with ETI.

Development of the Tracheostomy Well-Being Score in critically ill patients

PURPOSE

Little attention has been given to understanding the experiences and perceptions of tracheostomized patients. This study aimed to measure the impact of tracheostomy on well-being in critically ill patients with the development of the Tracheostomy Well-Being Score (TWBS).

METHODS

This is a prospective, monocentric, observational study including critically ill patients with a tracheostomy without delirium. A 25-item questionnaire with items from six categories (respiration, coughing, pain, speaking, swallowing, and comfort) was used to select the 12 best items (two per category) to form the TWBS score after testing on two consecutive days. Item selection secured (1) that there were no skewed response distributions, (2) high stability from day 1 to day 2, and (3) high prototypicality for the category in terms of item-total correlation.

RESULTS

A total of 63 patients with a mean age of 56 years were included. The 12 items of the TWBS were characterized by a high retest reliability (τ = 0.67-0.93) and acceptable internal consistency. The overlap with the clinician rating was low, suggesting that acquiring self-report data is strongly warranted.

CONCLUSION

With the TWBS, an instrument is available for the assessment of the subjective effects a tracheostomy has on in critically ill patients. The score potentially offers a chance to increase well-being of these patients. Additionally, this score could also increase their quality of life by improving tracheostomy and weaning management.

CLINICAL TRIAL REGISTRATION

German Clinical Trials Register Identifier DRKS00022073 (2020/06/02).

Computational modelling of an aerosol extraction device for use in COVID-19 surgical tracheotomy

In view of the ongoing COVID-19 pandemic and its effects on global health, understanding and accurately modelling the propagation of human biological aerosols has become crucial. Worldwide, health professionals have been one of the most affected demographics, representing approximately 20% of all cases in Spain, 10% in Italy and 4% in China and US. Methods to contain and remove potentially infected aerosols during Aerosol Generating Procedures (AGPs) near source offer advantages in reducing the contamination of protective clothing and the surrounding theatre equipment and space. In this work we describe the application of computational fluid dynamics in assessing the performance of a prototype extraction hood as a means to contain a high speed aerosol jet. Whilst the particular prototype device is intended to be used during tracheotomies, which are increasingly common in the wake of COVID-19, the underlying physics can be adapted to design similar machines for other AGPs. Computational modelling aspect of this study was largely carried out by Barcelona Supercomputing Center using the high performance computational mechanics code Alya. Based on the high fidelity LES coupled with Lagrangian frameworks the results demonstrate high containment efficiency of generated particles is feasible with achievable air extraction rates.

Evaluating the biomechanical characteristics of cuffed-tracheostomy tubes using finite element analysis

The objective of this study was to perform finite element analysis (FEA) of cuff inflation within an anatomically accurate model of an adult trachea in four different cuffed-tracheostomy tube designs. The leakage quantified by the distance between the cuff and trachea was largest for the Tracoe cuff and smallest for the Portex cuff. The smooth muscle stresses were greatest for the Portex and least for the Distal cuff, respectively. The proposed FEA model offers a promising approach to virtually evaluate the sealing efficacy of cuffed-tracheostomy tubes and the tracheal wall stresses induced by cuff inflation, prior to application.

Comparison of tracheoscopy and portable chest X-Ray in the evaluation of infant tracheostomy tube position

OBJECTIVE

To compare tracheoscopy and chest radiograph measurements of tracheostomy tube position in infants.

STUDY DESIGN

Retrospective chart review.

SETTING

Otolaryngology Department at Penn State Milton S. Hershey Medical Center.

SUBJECTS AND METHODS

All cases of pediatric patients who underwent tracheotomy at less than 1 year of age from 2014 to 2019 were reviewed. Patients were included if they had both intraoperative measurement of tracheostomy tube position relative to the carina by tracheoscopy and postoperative chest radiograph. Documented intraoperative findings were compared to measurements made on chest radiograph by an attending radiologist blinded to the intraoperative measurements.

RESULTS

The study included 66 patients; 30 patients (14:16, M:F) had available data. The mean distance from the distal tracheostomy tube to the carina measured by tracheoscopy was 8.88 mm (range, 3.5-20 mm) and measured radiographically was 11.71 mm (range, 2.4-23.3 mm). The mean difference between the measurements was 2.82 mm (p-value = 0.016). Ninety percent (n = 27) of patients had measurements that differed by greater than 2 mm; 53% (n = 16) had measurements that differed by 5 mm and 1% (n = 3) had measurements differing by greater than 10 mm.

CONCLUSION

In the infant population, significant discrepancy was found between direct tracheoscopy and chest radiograph measurements of the tracheostomy tube position. Measurements obtained by chest radiographs tend to overestimate the relative distance of the distal tracheostomy tube to the carina as compared to that of tracheoscopy. Clinical decisions regarding changes to tracheostomy tube sizes should mostly rely on tracheoscopy performed with the patient supine.