Clinical trial NCT02620956: Aerosol Deposition in Asthmatic Obese Women Using Heliox
Official title: Aerosol Deposition in Asthmatic Obese Women Using Heliox: A Randomized, Crossover, Controlled Clinical Trial Study
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: PHASE2
Conditions: Obese
Asthma
Lead sponsor: Universidade Federal de Pernambuco
Sponsor class: OTHER
First posted: 2015-12-03
Enrollment: 20
Sex: FEMALE
Minimum age (years): 18
Maximum age (years): 60
Standard ages: ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: CROSSOVER
Primary purpose: TREATMENT

Brief summary: BACKGROUND: The aim of this study was to assess pulmonary deposition and distribution of radio-aerosol in obese and normal women, using 2-D planar scintigraphy. METHODS: after inhaling an aerosol of technetium labeled diethylenetriamine penteacetic acid (99mTc - DTPA) with an activity of 1 mCi in a total dose volume with normal saline of 2,5 ml using a vibrating mesh inhaler.

Detailed description: BACKGROUND: Obese asthmatics are difficult to treat effectively, worse asthma control, and do not respond as well to standard therapy as lean asthmatic. Medical aerosols an important route of drug delivery in asthma, but narrowing in the airway cause by the obesity, can provoke turbulence and the effectiveness of the treatment could be compromise.

AIM: To assess pulmonary deposition, distribution of radio-aerosol and analyze upper way dimension in obese and normal weight women, using 2-D planar scintigraphyand and computed tomography. METHODS: 20 obese women, 10 asthmatics and 10 non-asthmatics took part of the first part of the study. Anthropometric and clinical assessments were carried out, than lung function was performed. After randomization of the sequence of gas (sequence 1- oxygen and heliox; sequence 2-heliox and heliox) that would be used to inhale an aerosol with technetium labeled diethylenetriamine penteacetic acid (99mTc - DTPA) with an activity of 1 mCi in a total dose volume with normal saline of 2,5 ml using a vibrating mesh inhaler. All patients inhaled two times with one week of washout between then to eliminate risk of residual trace radiation and to avoid the possibility of bias.

Eligibility criteria: Inclusion Criteria:

* Were women with Body mass Index (BMI) ≥30kg/m2 for obese and BMI =18.5 - 24.9 kg/m2 for the control group
* Age between 18 to 60 years old
* With and without moderate to severe asthma
* Positive response to bronchodilator (improvement in FEV1 and/or FVC of at least 12% and 200ml).

Exclusion Criteria:

* Were women with active pulmonary disease other than asthma
* Neuromuscular diseases
* Smokers and those incapable of performing procedures were excluded.

Primary outcomes:
measure: Aerosol deposition in pulmonary compartments
timeFrame: two days
Secondary outcomes:
measure: Aerosol deposition in vertical and horizontal gradient
timeFrame: two days
Other outcomes:
Locations:
city: Recife
country: Brazil
facility: Hospital the Federal University of Pernambuco
state: Pernambuco
Study officials:
References:
citation: Darquenne C, Prisk GK. Aerosol deposition in the human respiratory tract breathing air and 80:20 heliox. J Aerosol Med. 2004 Fall;17(3):278-85. doi: 10.1089/jam.2004.17.278.
citation: Hess DR, Fink JB, Venkataraman ST, Kim IK, Myers TR, Tano BD. The history and physics of heliox. Respir Care. 2006 Jun;51(6):608-12.
citation: Fink JB. Opportunities and risks of using heliox in your clinical practice. Respir Care. 2006 Jun;51(6):651-60.
citation: Niimi A, Matsumoto H, Amitani R, Nakano Y, Mishima M, Minakuchi M, Nishimura K, Itoh H, Izumi T. Airway wall thickness in asthma assessed by computed tomography. Relation to clinical indices. Am J Respir Crit Care Med. 2000 Oct;162(4 Pt 1):1518-23. doi: 10.1164/ajrccm.162.4.9909044.