BACKGROUND: The feasibility of electrical impedance tomography (EIT) as an alternative examination tool in cystic fibrosis (CF) was examined. METHODS: 14 CF patients and 14 healthy volunteers were studied. Spirometry and EIT measurements were performed simultaneously. The global inhomogeneity (GI) index was applied to assess the degree of ventilation homogeneity at different levels of maximum inspiratory volume. Ratios of maximum expiratory flow at 25% and 75% of vital capacity (MEF(25)/MEF(75)) were calculated for both global lung and regional areas in EIT images. RESULTS: Significant differences among GI values at various lung volumes were found in CF patients (P<0.01) but not in healthy subjects. Global MEF(25)/MEF(75) measured with spirometry and with EIT were highly correlated for all subjects (r(2)=0.69, P<0.01). Significant difference in global MEF(25)/MEF(75) was found between CF patients and healthy volunteers with both spirometer (CF: 0.15±0.09; healthy: 0.46±0.15; P<0.001) and EIT (CF: 0.14±0.09; healthy: 0.42±0.08; P<0.001). Regional airway obstruction was identified in the MEF(25)/MEF(75) maps in CF patients. CONCLUSIONS: Compared to the global parameters provided by spirometry, EIT is able to deliver both global and regional information to assess the airway obstruction in CF patients.
BACKGROUND: The feasibility of electrical impedance tomography (EIT) as an alternative examination tool in cystic fibrosis (CF) was examined. METHODS: 14 CFpatients and 14 healthy volunteers were studied. Spirometry and EIT measurements were performed simultaneously. The global inhomogeneity (GI) index was applied to assess the degree of ventilation homogeneity at different levels of maximum inspiratory volume. Ratios of maximum expiratory flow at 25% and 75% of vital capacity (MEF(25)/MEF(75)) were calculated for both global lung and regional areas in EIT images. RESULTS: Significant differences among GI values at various lung volumes were found in CFpatients (P<0.01) but not in healthy subjects. Global MEF(25)/MEF(75) measured with spirometry and with EIT were highly correlated for all subjects (r(2)=0.69, P<0.01). Significant difference in global MEF(25)/MEF(75) was found between CFpatients and healthy volunteers with both spirometer (CF: 0.15±0.09; healthy: 0.46±0.15; P<0.001) and EIT (CF: 0.14±0.09; healthy: 0.42±0.08; P<0.001). Regional airway obstruction was identified in the MEF(25)/MEF(75) maps in CFpatients. CONCLUSIONS: Compared to the global parameters provided by spirometry, EIT is able to deliver both global and regional information to assess the airway obstruction in CFpatients.
Authors: Bo Gong; Benjamin Schullcke; Sabine Krueger-Ziolek; Fan Zhang; Ullrich Mueller-Lisse; Knut Moeller Journal: Med Biol Eng Comput Date: 2018-01-08 Impact factor: 2.602
Authors: Peter A Muller; Jennifer L Mueller; Michelle Mellenthin; Rashmi Murthy; Michael Capps; Brandie D Wagner; Melody Alsaker; Robin Deterding; Scott D Sagel; Jordana Hoppe Journal: Physiol Meas Date: 2018-04-26 Impact factor: 2.833
Authors: Jennifer L Mueller; Peter Muller; Michelle Mellenthin; Rashmi Murthy; Michael Capps; Melody Alsaker; Robin Deterding; Scott D Sagel; Emily DeBoer Journal: Physiol Meas Date: 2018-05-31 Impact factor: 2.833
Authors: B Schullcke; S Krueger-Ziolek; B Gong; R A Jörres; U Mueller-Lisse; K Moeller Journal: J Clin Monit Comput Date: 2017-10-10 Impact factor: 2.502
Authors: Charlene S Stahr; Chaminda R Samarage; Martin Donnelley; Nigel Farrow; Kaye S Morgan; Graeme Zosky; Richard C Boucher; Karen K W Siu; Marcus A Mall; David W Parsons; Stephen Dubsky; Andreas Fouras Journal: Sci Rep Date: 2016-07-27 Impact factor: 4.379