Microbiome of the Lower Airways Alters Corticosteroid Responsiveness in Asthma

2013 ◽  
Vol 131 (2) ◽  
pp. AB138 ◽  
Author(s):  
Elena Goleva ◽  
Leisa P. Jackson ◽  
J. Kirk Harris ◽  
Richard J. Martin ◽  
Donald Y.M. Leung
Keyword(s):  
Lower Airways

Swallow Pattern Generator Reconfiguration of the Respiratory Neural Network

2009 ◽  
Vol 18 (1) ◽  
pp. 3-12
Author(s):  
Andrea Vovka ◽  
Paul W. Davenport ◽  
Karen Wheeler-Hegland ◽  
Kendall F. Morris ◽  
Christine M. Sapienza ◽  
...  
Keyword(s):  
Behavioral Control ◽  
Upper Airway ◽  
Pattern Generator ◽  
Breathing Patterns ◽  
Motor Patterns ◽  
Control Assembly ◽  
Pharyngeal Swallow ◽  
Laryngeal Vestibule ◽  
Lower Airways ◽  
Swallow Apnea

Abstract When the nasal and oral passages converge and a bolus enters the pharynx, it is critical that breathing and swallow motor patterns become integrated to allow safe passage of the bolus through the pharynx. Breathing patterns must be reconfigured to inhibit inspiration, and upper airway muscle activity must be recruited and reconfigured to close the glottis and laryngeal vestibule, invert the epiglottis, and ultimately protect the lower airways. Failure to close and protect the glottal opening to the lower airways, or loss of the integration and coordination of swallow and breathing, increases the risk of penetration or aspiration. A neural swallow central pattern generator (CPG) controls the pharyngeal swallow phase and is located in the medulla. We propose that this swallow CPG is functionally organized in a holarchical behavioral control assembly (BCA) and is recruited with pharyngeal swallow. The swallow BCA holon reconfigures the respiratory CPG to produce the stereotypical swallow breathing pattern, consisting of swallow apnea during swallowing followed by prolongation of expiration following swallow. The timing of swallow apnea and the duration of expiration is a function of the presence of the bolus in the pharynx, size of the bolus, bolus consistency, breath cycle, ventilatory state and disease.

Clinical and functional peculiarities at patients with bronchial asthma, chronic obstructive pulmonary disease and overlap of asthma-chronic obstructive pulmonary disease

2020 ◽  
Vol 24 (4) ◽  
pp. 80-86
Author(s):  
V. I. Trofimov ◽  
D. Z. Baranov
Keyword(s):  
Chronic Obstructive Pulmonary Disease ◽  
Pulmonary Disease ◽  
Bronchial Asthma ◽  
Blood Test ◽  
Chronic Obstructive ◽  
Inflammation Markers ◽  
Obstructive Pulmonary Disease ◽  
Copd Patients ◽  
Functional Features ◽  
Lower Airways

BACKGROUND: a comparative analysis of laboratory and instrumental tests at patients with bronchial obstructive diseases seems very actual due to the wide prevalence of these diseases. THE AIM: to evaluate characteristics of spirometry as well as allergic (total IgE, sputum eosinophils) and infectious (blood and sputum leucocytes, ESR, CRP, fibrinogen) inflammation markers at patients with bronchial obstructive diseases. PATIENTS AND METHODS: 104 case histories of patients with bronchial asthma, chronic obstructive pulmonary disease and overlap were analyzed including age, duration of smoking (pack-years), laboratory (clinical blood test, biochemical blood test, general sputum analysis, sputum culture) and instrumental (spirometry, body plethysmography, echocardiography) tests. Data were processed statistically with non-parametric methods. RESULTS: COPD patients were older than other groups’ patients, had the highest pack-years index. ACO patients were marked with maximal TLC and Raw, minimal FEV1, FEF25-75, FEV1/FVC. Patients with COPD had the highest inflammation markers (leucocyte count, CRP, fibrinogen). CONCLUSION: high active inflammation may cause severe lower airways possibility disorders at patients with COPD. Data related to a possible role of K. pneumoniaе in the pathogenesis of eosinophilic inflammation in lower airways are of significant interest. Patients with ACO occupy an intermediate position between asthma and COPD patients based on clinical and functional features.

scholarly journals Methacholine causes reflex bronchoconstriction

1999 ◽  
Vol 86 (1) ◽  
pp. 294-297 ◽  
Author(s):  
Elizabeth M. Wagner ◽  
David B. Jacoby
Keyword(s):  
Smooth Muscle ◽  
Airway Smooth Muscle ◽  
Bronchial Artery ◽  
Muscle Tension ◽  
Reflex Response ◽  
Resistance Change ◽  
Bilateral Vagotomy ◽  
Airways Resistance ◽  
Lower Airways

To determine whether methacholine causes vagally mediated reflex constriction of airway smooth muscle, we administered methacholine to sheep either via the bronchial artery or as an aerosol via tracheostomy into the lower airways. We then measured the contraction of an isolated, in situ segment of trachealis smooth muscle and determined the effect of vagotomy on the trachealis response. Administering methacholine to the subcarinal airways via the bronchial artery (0.5–10.0 μg/ml) caused dose-dependent bronchoconstriction and contraction of the tracheal segment. At the highest methacholine concentration delivered, trachealis smooth muscle tension increased an average of 186% over baseline. Aerosolized methacholine (5–7 breaths of 100 mg/ml) increased trachealis tension by 58% and airways resistance by 183%. As the bronchial circulation in the sheep does not supply the trachea, we postulated that the trachealis contraction was caused by a reflex response to methacholine in the lower airways. Bilateral vagotomy essentially eliminated the trachealis response and the airways resistance change after lower airways challenge (either via the bronchial artery or via aerosol) with methacholine. We conclude that 1) methacholine causes a substantial reflex contraction of airway smooth muscle and 2) the assumption may not be valid that a response to methacholine in humans or experimental animals represents solely the direct effect on smooth muscle.

Rhinosinusitis and the Lower Airways

2009 ◽  
Vol 29 (4) ◽  
pp. 733-740 ◽  
Author(s):  
Peter W. Hellings ◽  
Greet Hens
Keyword(s):  
Lower Airways

P114 Agrexpro: breton dairy farmer’s occupational exposures related to lower airways diseases

2016 ◽  
Author(s):  
Hugo Pfister ◽  
Laurent Madec ◽  
Laurent Vernhet ◽  
Stephane Jouneau ◽  
Martine Chouvet
Keyword(s):  
Occupational Exposures ◽  
Lower Airways

The interaction between upper and lower airways in allergic rhinitis

2001 ◽  
Vol 26 (4) ◽  
pp. 341-341
Author(s):  
W. Fokkens ◽  
G.J. Braunstahl
Keyword(s):  
Allergic Rhinitis ◽  
Lower Airways

Cytokine expression in the lower airways of nonasthmatic subjects with allergic rhinitis: Influence of natural allergen exposure

2000 ◽  
Vol 106 (5) ◽  
pp. 904-910 ◽  
Author(s):  
Jamila Chakir ◽  
Michel Laviolette ◽  
Hélène Turcotte ◽  
Michel Boutet ◽  
Louis-Philippe Boulet
Keyword(s):  
Allergic Rhinitis ◽  
Allergen Exposure ◽  
Cytokine Expression ◽  
Lower Airways

Lung disease manifestations in Down Syndrome

2021 ◽  
Author(s):  
Soula Danopoulos ◽  
Gail H. Deutsch ◽  
Claire Dumortier ◽  
Thomas Jay Mariani ◽  
Denise Al Alam
Keyword(s):  
Down Syndrome ◽  
Lung Disease ◽  
Chromosomal Abnormalities ◽  
Respiratory Illness ◽  
Multiple Organ ◽  
Upper Airways ◽  
Live Births ◽  
Organ Systems ◽  
Entire Lung ◽  
Lower Airways

Down Syndrome (DS) is one of the most prevalent chromosomal abnormalities world-wide, affecting 1 in 700 live births. Although multiple organ systems are affected by the chromosomal defects, respiratory failure and lung disease are the leading causes of morbidity and mortality observed in DS. Manifestations of DS in the respiratory system encompass the entire lung starting from the nasopharynx, trachea/upper airways to the lower airways and alveolar spaces, as well as vascular and lymphatic defects. Most of our knowledge on respiratory illness in persons with DS arises from pediatric studies, however many of these disorders present early in infancy supporting developmental mechanisms. In this review we will focus on the different lung phenotypes in DS, as well as the genetic and molecular pathways that may be contributing to these complications during development.

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