Safe Use of Speaking Valve in Children During Sleep Using Trans-tracheal Pressure Measurement

Overview

Many children who are born medically fragile due to prematurity, multiple congenital abnormalities or an acquired insult (i.e. cardiac, neurologic, etc.) may require tracheostomy tube placement due to need of chronic respiratory support. Patients on tracheostomy tubes are often unable to vocalize, causing a delay in speech development and poor speech. To help restore normal phonation and promote language development in young pediatric patients with tracheostomies, speaking valves are used. Previously it was shown that the Passy-Muir speaking valve was safe to use during sleep in children by showing there were no adverse cardiopulmonary events seen. One objective measurement that was not evaluated was trans-tracheal pressure manometry. The purpose of this study is to continue to validate the safety of the Passy-Muir speaking valve while asleep, with the use of trans-tracheal manometry by comparing expiratory pressure manometry while the patient is awake and asleep.

Previously it was shown that the Passy-Muir speaking valve was safe to use during sleep in children. There were no adverse cardiopulmonary events seen while wearing the speaking valve during sleep. However, trans-tracheal pressure was not measured while these children were asleep wearing the Passy-Muir speaking valve.The investigators hypothesize that patients who tolerate speaking valve while awake will have similar trans-tracheal pressure measurement when asleep as when they are awake. The specific aims of this proposal are: 1\) to show that the Passy-Muir speaking valve worn during sleep has similar trans-tracheal pressure manometry as when worn while awake. The primary outcome measure is to show that trans-tracheal manometry measurement is similar while on the Passy-Muir speaking valve when patients are awake and asleep Secondary outcomes are a) recording of symptoms (i.e. choking, gagging, increased respiratory rate, abnormal breathing pattern, coughing, chest tightness and aversion) while wearing the speaking valve either awake or asleep b) recording vital signs which will be compared to normal and baseline for age (i.e. heart rate, respiratory rate, end-tidal carbon dioxide and oxygen saturation) while awake and asleep. Background and significance: Previously it was shown that Passy-Muir speaking valve is safe to use during sleep in children. However it continues to be contraindicated for use while asleep. A small prospective study done on 10 tracheostomized adult patients with a mean age of 70 years showed that the use of the speaking valve for one night in seriously ill patients was not associated with apneas or significant desaturations. A cohort study of 32 tracheostomized patients showed that 14 patients were able to tolerate speaking valve for 24 hours; even during sleep. Pediatric patients with tracheostomy tube are often unable to vocalize. Tracheostomy tubes allow the exhaled flow of air to bypass the vocal cords out through the opening of the tube making speech difficult. This causes a delay in speech development and poor speech. Speaking valves, like the Passy-Muir valve, restore normal phonation and promote language development in young pediatric patients with tracheostomies. Speech development is not the only benefit seen with speaking valves. Speaking valves can lead to improvement in swallowing safety reducing aspiration, improved ventilator weaning leading to more rapid tracheal decannulation, reduce secretion management, improve hygiene, and enhance smell and taste. Evaluation of speaking valve tolerance can be done by monitoring vital signs (i.e. respiratory rate, heart rate, and oxygen saturation). In addition, measurement of trans-tracheal pressure is an invaluable tool in evaluating subjects for speaking valve placement. Measurement of trans-tracheal pressure is predictive of good tolerance of the valve. The measurement allows one to quickly and easily assess patency of the upper airway and the ability to force air through the vocal cords. If the pressures are elevated, greater than 10 cm of water on inhalation phase and 30cm of water on the exhalation phase, it would indicate an obstruction in the upper part of the trachea (i.e. subglottic stenosis). The pressures can also evaluate respiratory function prior to considering patients for placement of the valve. Many children who are born medically fragile due to prematurity, multiple congenital abnormalities or an acquired insult (i.e. cardiac, neurologic, etc.) may require tracheostomy tube placement due to need of chronic respiratory support. Initially, after a patient is assessed for a speaking valve and is cleared for use, a patient may be apprehensive toward the speaking valve. If a patient displays discomfort, anxiety, dyspnea/respiratory distress or there is air trapping (from the build-up of subglottic pressure from incomplete exhalation) trials are repeated on subsequent days. However, one can assume that initial failure is due to aversion, but it may be due to resistance in the upper airway, or vice versa. The purpose of this study is to continue to validate the safety of the Passy-Muir speaking valve while asleep, with the use of trans-tracheal manometry by comparing expiratory pressure manometry while the patient is awake and asleep.