The objective was to develop a non-invasive method for continuously monitoring respiratory rate (RR) based on tracheal sounds. 25 volunteers and 36 patients with chronic pulmonary diseases were enrolled in a clinical study. Tracheal sounds were acquired using a contact piezoelectric sensor placed on the examinee's throat and analyzed using a combined investigation of the sound envelope and frequency content. RR estimates were compared to reference measurements taken from a pneumotachometer coupled to a face mask worn by the examinee. RR was also manually counted by a respiratory technician. Two types of breathing (mouth and nose) and three different positions were studied (fowler, semi-fowler and supine). RR estimated in volunteers had a success rate (SR) of 96%, a correlation coefficient (r) of 0.99 and a standard error of the estimate (SEE) of 0.56. The RR estimated in patients was comparable or slightly better (SR = 85%, r = 0.93 and SEE = 1.49) than those obtained by manual count (SR = 82%, r = 0.91, SEE = 1.58), which is the method widely used in clinical settings. No significant difference in the capacity to estimate RR was found related to posture and breathing type, making this method useful for continuous monitoring.
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http://dx.doi.org/10.1109/IEMBS.2004.1403156 | DOI Listing |
J Anat
January 2025
Graduate School of Medicine, Juntendo University, Tokyo, Japan.
The anatomical innovation of sound-producing organs, which gives rise to a wide variety of sound signals, is one of the most fundamental factors leading to the explosive speciation of modern birds. Despite being a key clue to resolving the homology of sound-controlling muscles among birds, only few studies have explored the embryonic development of syringeal muscles. Using serial histological sections and immunohistochemistry, we described the three-dimensional anatomy and development of the cartilage, muscle, and innervation pattern of the tracheobronchi in three avian species: domestic fowls, cockatiels, and zebra finches.
View Article and Find Full Text PDFMinerva Pediatr (Torino)
December 2024
CINTESIS@RISE, MEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal -
Background: Lung auscultation using a smartphone built-in microphone is promising for home monitoring of pediatric respiratory diseases. Our aim was to compare respiratory sounds recorded by a smartphone and a digital stethoscope by assessing the proportion of quality recordings and adventitious sounds detected by each device.
Methods: A comparative early feasibility study with children from a public school in Northern Portugal was conducted.
J Cardiothorac Surg
December 2024
Chirurgie Thoracique et Vasculaire, Assistance Publique-Hôpitaux de Paris, Hôpitaux Universitaires Paris Seine-Saint-Denis, Hôpital Avicenne, Université Sorbonne Paris Nord, Bobigny, France.
Background: A 51-year-old woman was referred to our department due to chronic dry cough lasting six years without an etiological diagnosis. The patient suffered from chronic deterioration in her quality of life due to a persistent cough that sounded like a barking seal.
Case Presentation: A severe form of malacia involving the inferior third of trachea and the main bronchi was diagnosed.
J Voice
December 2024
Freiburg Institute for Musicians' Medicine, Medical Center, University of Freiburg, Elsässer Str 2m, 79106, Freiburg, Germany; Faculty of Medicine, University of Freiburg, Freiburg, Germany.
Objectives: In voice production, interactions occur between the oscillating vocal folds, the respiratory system, and the vocal tract. However, it is not yet sufficiently understood how the respiratory system could affect the vocal tract configuration. It is hypothesized that a reduction in tracheal pull, caused by decreasing lung volume, along with shifts in dominant exhalation forces (from inspiratory to expiratory muscles), leads to a larynx elevation with shortening of the vocal tract tube, and consecutively, articulatory adjustments to preserve consistent sound quality.
View Article and Find Full Text PDFJ Med Case Rep
November 2024
Department of Pediatric and Child Health, Aga Khan University Hospital, Karachi, Pakistan.
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