Source: Annual Congress 2009 - How to deal with tracheal stenosis
Disease area: Airway diseases

Abstract

Purpose: To study the pattern of the pressure-pressure curve (P-P curve) to assess the airway mechanics and the outcome of interventional pulmonology.
Methods: We assessed lateral pressure (Plat) before interventional bronchoscopy in 15 patients with tracheobronchial stenosis (7 lung cancer, 3 esophageal carcinoma, 1 thyroid carcinoma, 1 choriocarcinoma, 1 tracheobronchial malacia, 1 bronchial tuberculosis, 1 cicatricial stenosis). Plat from trachea to lower bronchus was measured using an airway catheter during quiet breathing. For each subject, Plat at both proximal and distal site were plotted during both inspiration and expiration (P-P curve). Then we analyzed the pattern of the P-P curves.
Results: There was no significant difference between inspiration and expiration in the angle of P-P curve (11.4±12.6° inspiration vs 9.7±13.8° expiration; P=0.24). In some patients, the shape of P-P curve was not linear as we measured Plat during operation. For patients with extrathoracic fixed stenosis, the angle of P-P curve during inspiratory phase was smaller than during expiratory phase. For patients with tracheobronchial malacia, the angle of P-P curve during expiration was smaller than during inspiration. In patients with bronchial stenosis, the shape of the P-P curve at the narrowest side became loop shaped when comparing left and right sides. When the airway was sufficiently patent after treatment, the loop disappeared.
Conclusions: The pressure - pressure curve is useful to estimate the mechanics of the tracheobronchial stenosis and outcomes of interventional pulmonology.

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Citations should be made in the following way:
H. Nishine, T. Hiramoto, H. Kida, T. Inoue, T. Miyazawa (Kawasaki, Japan). Assessment of tracheobronchial stenosis using pressure-pressure curves by airway catheter. Eur Respir J 2009; 34: Suppl. 53, 4236

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