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- Klinische proef NCT01988467
The Protective Role of the Nose During Acute Exposure to Passive Smoking.
Studie Overzicht
Toestand
Conditie
Interventie / Behandeling
Gedetailleerde beschrijving
Analysis of the laboratory testing:
The measurement of NO for the respiratory tract was performed with a Ecomedics CLD 88spNO analyzer as follows: the examinee performed tidal breathing with a closed nose, through a special mouthpiece and then took a deep breath and exhale steadily with a flow of 50ml/sec. After 3 attempts, during which we obtained an exhaled NO measurement each time, until we obtained a reliability index CV <10%.
For the oscillometry (IOS) of the respiratory tract the Master Screen IOS VIASYS was used, the examinee breathed quietly through the mouthpiece with his/her nose closed for a period of 1 minute. In this way we measured the impedance Z at 5 Hz, the resistance to 5,10,20 Hz respectively, the reactance in 5,10,20 Hz respectively, the central and peripheral airway resistance and resonant frequency.
Rhinomanometry was done by the Master Screen IOS VIASYS system, the examinee breathed calmly through the examined nostril, while the other was closed, 5 breaths per attempt were performed. After 3 attempts for each nostril, we assessed the average inspiratory resistance for each nostril separately.
The plethysmography took place on the Master Screen Body of VIASYS, the door of the Body was closed as well as all the doors of the room and without the presence of motion in the test room. The subject performed calm breaths with a closed nose, through the mouthpiece and then took a deep breath, followed by deep exhalation. At the end of the effort we had values for the total lung capacity (TLC), residual volume (RV), airway resistance (R), vital capacity (VC), the functional residual capacity (FRC), Exhaled residual volume (ERV) and the ratio RV / TLC. This was repeated 3 times and one was selected to be the most representative.
The P.100 was performed through the Master Screen Body of VIASYS with the door of the Body Box opened. The volunteer was performing calm breaths with a closed nose, through the mouthpiece, during which a shutter blocked the flow. The obtained value of the pressure was the one that developed in the first second of inhalation with the shutter down is noted. This repeated 3 times and one selected to be the most representative.
Spirometry and the flow-volume curve were assessed with a Master Screen Body of VIASYS with the door of the Body Box opened as follows: The subject performed tidal breathing with a closed nose, through the mouthpiece, and then took a sharp deep breath, which was followed by sharp deep exhalation, and the test ended with deep inhalation. At the end of the effort we had values for forced vital capacity (FVC), the violent expiratory the first volume 1 (FEV1), the ratio FVC/FEV1%, peak expiratory flow (PEF) and mesoexpiratory flow in peripheral airways than 25% to 75% of vital capacity. This was repeated 3 times and one was selected to be the most representative.
The assessment of the type of breathing during exposure to secondhand smoke was performed through the VIASYS Respitrace. The protocol was as follows: The volunteer breathed calmly over 20 times with the mouth closed and once with a closed nose, while wearing two rubber bands, one on the chest and one to the abdomen, which incorporates electrodes. The waveform of the breath in the thorax, abdomen and the average of these was recorded in real time. Also, for every breath we had values for the inspiratory time, expiratory time, total time, the participation rate of the chest, the participation rate of the ventricle, the peak inspiratory flow (Pif), the mean inspiratory flow (Mif), and the flow-volume curve and the analysis chart of each breath in the thoracic and abdominal component.
Studietype
Inschrijving (Werkelijk)
Fase
- Fase 1
Contacten en locaties
Studie Locaties
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Attiki
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Athens, Attiki, Griekenland
- Hellenic Anticancer Society
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Deelname Criteria
Geschiktheidscriteria
Leeftijden die in aanmerking komen voor studie
Accepteert gezonde vrijwilligers
Geslachten die in aanmerking komen voor studie
Beschrijving
Inclusion Criteria:
- healthy volunteer adults non-smokers
Exclusion Criteria:
- < 18 years old
- Recent or chronic disease of the upper or lower respiratory system.
- Current pregnancy
- Breastfeeding women
Studie plan
Hoe is de studie opgezet?
Ontwerpdetails
- Primair doel: Preventie
- Toewijzing: Niet-gerandomiseerd
- Interventioneel model: Parallelle opdracht
- Masker: Enkel
Wapens en interventies
Deelnemersgroep / Arm |
Interventie / Behandeling |
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Experimenteel: nasal breathing
At the time that the exposure took place with nasal breathing, the study was as follows: Before the exposure: rhinomanometry, IOS , FeNO , spirometry, plethysmography, P.100. Exposure to second hand smoking:Each volunteer was exposed to secondhand smoking twice, for 20 minutes, once with nasal breathing and once with oral breathing, with 3 days interval and in random sequence. After the exposure: rhinomanometry, IOS , FeNO , spirometry,plethysmography , P.100. |
The duration of the exposure to second hand smoke both days was for 20 minutes within a 250mgr/m3 concentration box room.
A smoking machine was used, which mimics the smoker (up to 6 breaths per minute in tobacco volume 80ml for each inhalation).
The exposure was sometimes with closed mouth and others with closed nose in random sequence.
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Experimenteel: oral breathing
At the time that the exposure took place with oral breathing, the study was as follows: Before the exposure: IOS, exhaled nitric oxide (FeNO), spirometry, plethysmography and P.100. Exposure to second hand smoking: each volunteer was exposed to secondhand smoking twice, for 20 minutes, once with nasal breathing and once with oral breathing, with 3 days interval and in random sequence. After the exposure: IOS, FeNO, spirometry,plethysmography and P.100. |
The duration of the exposure to second hand smoke both days was for 20 minutes within a 250mgr/m3 concentration box room.
A smoking machine was used, which mimics the smoker (up to 6 breaths per minute in tobacco volume 80ml for each inhalation).
The exposure was sometimes with closed mouth and others with closed nose in random sequence.
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Wat meet het onderzoek?
Primaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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exhaled nitric oxide (FeNO) for the respiratory tract
Tijdsspanne: before exposure (Baseline) and after exposure with a 30 minutes interval
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To compare the changes between the two types of breathing
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before exposure (Baseline) and after exposure with a 30 minutes interval
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plethysmography
Tijdsspanne: before exposure (Baseline) and after exposure with a 30 minutes interval
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plethysmography take place both at oral and nasal breathing twice before and after intervention.
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before exposure (Baseline) and after exposure with a 30 minutes interval
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Secundaire uitkomstmaten
Uitkomstmaat |
Maatregel Beschrijving |
Tijdsspanne |
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Eye or nose irritation
Tijdsspanne: during the exposure to second hand smoke
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During the exposure to second hand smoke that lasted 20 minutes the examinee had his /her mouth closed and filled in an evaluation Questionnaire about eye or nose irritation.
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during the exposure to second hand smoke
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Medewerkers en onderzoekers
Sponsor
Medewerkers
Onderzoekers
- Studie stoel: Panagiotis K Behrakis, Professor, National and Kapodistrian University of Athens
- Hoofdonderzoeker: Palagia M Karas, MD, National and Kapodistrian University of Athens
Publicaties en nuttige links
Algemene publicaties
- Vardavas CI, Anagnostopoulos N, Kougias M, Evangelopoulou V, Connolly GN, Behrakis PK. Short-term pulmonary effects of using an electronic cigarette: impact on respiratory flow resistance, impedance, and exhaled nitric oxide. Chest. 2012 Jun;141(6):1400-1406. doi: 10.1378/chest.11-2443. Epub 2011 Dec 22.
- Vardavas CI, Anagnostopoulos N, Kougias M, Evangelopoulou V, Connolly GN, Behrakis PK. Acute pulmonary effects of sidestream secondhand smoke at simulated car concentrations. Xenobiotica. 2013 Jun;43(6):509-13. doi: 10.3109/00498254.2012.741272. Epub 2012 Dec 4.
Studie record data
Bestudeer belangrijke data
Studie start
Primaire voltooiing (Werkelijk)
Studie voltooiing (Werkelijk)
Studieregistratiedata
Eerst ingediend
Eerst ingediend dat voldeed aan de QC-criteria
Eerst geplaatst (Schatting)
Updates van studierecords
Laatste update geplaatst (Schatting)
Laatste update ingediend die voldeed aan QC-criteria
Laatst geverifieerd
Meer informatie
Termen gerelateerd aan deze studie
Andere studie-ID-nummers
- 6322/6.3.13
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