A time-tested protocol for intrathoracic pressure monitoring during sleep is described. This method of esophageal manometry uses a fluid-filled catheter to measure variations in transmitted intrathoracic pressure with respiration. Esophageal manometry is an invaluable tool for the sleep specialist in the diagnosis of sleep-related breathing disorders, especially for detecting cases of upper airway resistance syndrome and for distinguishing subtle central apneas from obstructive events. The methods for scoring esophageal pressure, the indications and contraindications for esophageal manometry, the use of esophageal manometry as the 'gold standard' for the measurement of respiratory effort, and directions for future research are also discussed.
"The sensor was calibrated before each measurement by introducing the catheter in a sealed cylinder, by manually incrementing the pressure inside the cylinder with a pressure manometer from 0 to 100 mmHg and manually setting the calibration markers in the pressure amplifier. The catheter was introduced through the patient's nostrils after spraying the nasopharynx with xylocaine and positioned in the lower third of the esophagus , . Other physiological signals, like arterial oxygen saturation (SpO 2 ), body position, pulse, and thoracic and abdominal respiratory inductance plethysmography (ProTech, Services Inc, Mukilteo, WA, USA) were recorded with an 8-bit resolution. "
[Show abstract][Hide abstract] ABSTRACT: The automatic differentiation of obstructive and central respiratory events is a major challenge in the diagnosis of sleep-disordered breathing. Esophageal pressure (Pes) measurement is the gold-standard method to identify these events. This study presents a new classifier that automatically differentiates obstructive and central hypopneas with the Pes signal and a new approach for an automatic noninvasive classifier with nasal airflow. An overall of 28 patients underwent night polysomnography with Pes recording, and a total of 769 hypopneas were manually scored by human experts to create a gold-standard annotation set. Features were automatically extracted from the Pes signal to train and test the classifiers (discriminant analysis, support vector machines, and adaboost). After a significantly (p < 0.01) higher incidence of inspiratory flow limitation episodes in obstructive hypopneas was objectively, invasively assessed compared to central hypopneas, the feasibility of an automatic noninvasive classifier with features extracted from the airflow signal was demonstrated. The automatic invasive classifier achieved a mean sensitivity, specificity, and accuracy of 0.90 after a 100-fold cross validation. The automatic noninvasive feasibility study obtained similar hypopnea differentiation results as a manual noninvasive classification algorithm. Hence, both systems seem promising for the automatic differentiation of obstructive and central hypopneas.
[Show abstract][Hide abstract] ABSTRACT: The aim of the study was to determine the role of respiratory events, assessed by means of esophageal pressure monitoring, during arousals from slow wave sleep in adult patients with parasomnias.
Ten patients with parasomnias (sleepwalking, night terrors, or both) and 10 control subjects matched for gender and age underwent 3 consecutive nights of polysomnography.
By increasing sleep fragmentation, esophageal pressure monitoring has a deleterious effect on sleep architecture in patients with parasomnias and in control subjects. Respiratory events occur more frequently in parasomniacs than in controls. Respiratory effort seems to be responsible for the occurrence of a great number of arousal reactions in parasomniacs and is involved in triggering the parasomnia episodes.
Sleep-disordered breathing seems to be frequently associated with parasomnias during slow wave sleep, emphasizing the utility of performing esophageal pressure monitoring in cases of sleep walking or night terrors.
[Show abstract][Hide abstract] ABSTRACT: To assess tolerance of esophageal pressure monitoring (EPM) among 5- to 13-year-old children during research polysomnography at study entry and again 1 year later.
Prospective, observational study.
University-based sleep laboratory.
Children scheduled for adenotonsillectomy or hernia repair.
None; all operations were performed for clinical indications only.
Forty-two of 336 families approached about the study declined to participate mainly to avoid EPM. The EPM was usually the main concern for the 47 adenotonsillectomy and 7 hernia-repair patients and families who did participate. Among 54 enrolled subjects, 51 allowed attempts at insertion of the esophageal catheter, and insertion was successful in all cases; 38 tolerated EPM for at least 2 hours; 33 maintained EPM for the entire night; and 36 had repeat EPM 1 year later for at least 2 hours. Reasons for EPM failure included crying at insertion, vomiting, pain, and inadvertent catheter removal during sleep. The children who tolerated EPM for at least 2 hours did not differ from other subjects based on age, sex, presence of a disruptive behavior disorder, anxiety, tonsil size, history of tonsillitis, or body mass index (all P > .05).
The EPM was well tolerated in most school-aged volunteers, but many families did not volunteer, and some children were not able to endure EPM for at least 2 hours. Although better success might be achieved in clinical settings if EPM is medically indicated and not part of voluntary research, EPM is still likely to create significant concern, for children and parents, that must be weighed against anticipated benefits.
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.