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The accuracy of postoperative, non-invasive Air-Test to diagnose atelectasis in healthy patients after surgery: a prospective, diagnostic pilot study
Hosp Clin Univ Valencia, Anesthesiol & Crit Care, Valencia, Spain..
Consorci Hosp Gen Univ Valencia, Anesthesiol & Crit Care, Valencia, Spain..
Hosp Privado Comunidad Mar Del Plata, Dept Anesthesiol, Mar De Plata, Argentina..
Uppsala universitet, Medicinska och farmaceutiska vetenskapsområdet, Medicinska fakulteten, Institutionen för kirurgiska vetenskaper, Hedenstiernalaboratoriet. Inst Salud Carlos III, CIBER Enfermedades Resp, Madrid, Spain..ORCID-id: 0000-0002-7412-2970
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2017 (engelsk)Inngår i: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 7, nr 5, artikkel-id e015560Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Objective To assess the diagnostic accuracy of peripheral capillary oxygen saturation (SpO(2)) while breathing room air for 5 min (the 'Air-Test') in detecting postoperative atelectasis. Design Prospective cohort study. Diagnostic accuracy was assessed by measuring the agreement between the index test and the reference standard CT scan images. Setting Postanaesthetic care unit in a tertiary hospital in Spain. Participants Three hundred and fifty patients from 12 January to 7 February 2015; 170 patients scheduled for surgery under general anaesthesia who were admitted into the postsurgical unit were included. Intervention The Air-Test was performed in conscious extubated patients after a 30 min stabilisation period during which they received supplemental oxygen therapy via a venturi mask. The Air-Test was defined as positive when SpO(2) was >= 96% and negative when SpO(2) was >= 97%. Arterial blood gases were measured in all patients at the end of the Air-Test. In the subsequent 25 min, the presence of atelectasis was evaluated by performing a CT scan in 59 randomly selected patients. Main outcome measures The primary study outcome was assessment of the accuracy of the Air-Test for detecting postoperative atelectasis compared with the reference standard. The secondary outcome was the incidence of positive Air-Test results. Results The Air-Test diagnosed postoperative atelectasis with an area under the receiver operating characteristic curve of 0.90 (95% CI 0.82 to 0.98) with a sensitivity of 82.6% and a specificity of 87.8%. The presence of atelectasis was confirmed by CT scans in all patients (30/30) with positive and in 5 patients (17%) with negative Air-Test results. Based on the Air-Test, postoperative atelectasis was present in 36% of the patients (62 out of 170). Conclusion The Air-Test may represent an accurate, simple, inexpensive and non-invasive method for diagnosing postoperative atelectasis.

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2017. Vol. 7, nr 5, artikkel-id e015560
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URN: urn:nbn:se:uu:diva-329118DOI: 10.1136/bmjopen-2016-015560ISI: 000402533300113OAI: oai:DiVA.org:uu-329118DiVA, id: diva2:1150384
Tilgjengelig fra: 2017-10-18 Laget: 2017-10-18 Sist oppdatert: 2017-11-29bibliografisk kontrollert

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