Haemodynamic effects of proportional assist ventilation during high-intensity exercise in patients with chronic obstructive pulmonary disease

dc.contributor.authorCarrascossa, Claudia R. [UNIFESP]
dc.contributor.authorOliveira, Cristino C. [UNIFESP]
dc.contributor.authorBorghi-Silva, Audrey [UNIFESP]
dc.contributor.authorFerreira, Eloara M. V. [UNIFESP]
dc.contributor.authorMaya, Joyce [UNIFESP]
dc.contributor.authorQueiroga, Fernando [UNIFESP]
dc.contributor.authorBerton, Danilo C. [UNIFESP]
dc.contributor.authorNery, Luiz E. [UNIFESP]
dc.contributor.authorAlberto Neder, J. [UNIFESP]
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.date.accessioned2016-01-24T14:05:40Z
dc.date.available2016-01-24T14:05:40Z
dc.date.issued2010-11-01
dc.description.abstractBackground and objective: Proportional assist ventilation (PAV) has been proposed as a more physiological modality of non-invasive ventilation, thereby reducing the potential for deleterious cardio-circulatory effects during exercise, in patients with COPD. We therefore evaluated whether PAV modulates the kinetic and 'steady-state' haemodynamic responses to exercise in patients with moderate-to-severe COPD.Methods: Twenty patients underwent constant-load (75-80% peak work rate) cycle ergometer exercise testing to the limit of tolerance (T(lim)), while receiving PAV or breathing spontaneously. Stroke volume (SV), heart rate (HR) and cardiac output (CO) were monitored by impedance cardiography.Results: Compared with unassisted breathing, PAV increased T(lim) in 8/20 patients (median improvement 113% (range 8 to 212) vs -20% (range -40 to -9)). PAV had no significant effects on 'steady-state' haemodynamic responses either in patients with or those without increased T(lim) (P > 0.05). However, at the onset of exercise, SV kinetics were slowed with PAV, in 13/15 patients with analysable data. HR dynamics remained unaltered or failed to accelerate sufficiently in nine of these patients, thereby slowing CO kinetics (T(1/2) 61 s (range 81-30) vs 89 s (range 100-47)). These deleterious effects were not, however, associated with PAV-induced changes in T(lim) (P > 0.05).Conclusions: PAV slowed the SV and CO kinetics at the onset of high-intensity exercise in selected patients with moderate-to-severe COPD. However, these adverse effects of PAV disappeared during the stable phase of exercise, and were not related to the ergogenic potential of PAV in this patient population.en
dc.description.affiliationUniversidade Federal de São Paulo UNIFESP, Pulm Funct & Clin Exercise Physiol Unit, Div Resp Dis, Dept Med, São Paulo, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Cardiopulm Physiotherapy Lab, BR-13560 Sao Carlos, SP, Brazil
dc.description.affiliationUnifespUniversidade Federal de São Paulo UNIFESP, Pulm Funct & Clin Exercise Physiol Unit, Div Resp Dis, Dept Med, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIDFAPESP: 05/00722-0
dc.format.extent1185-1191
dc.identifierhttp://dx.doi.org/10.1111/j.1440-1843.2010.01846.x
dc.identifier.citationRespirology. Malden: Wiley-Blackwell Publishing, Inc, v. 15, n. 8, p. 1185-1191, 2010.
dc.identifier.doi10.1111/j.1440-1843.2010.01846.x
dc.identifier.issn1323-7799
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/33067
dc.identifier.wosWOS:000283601100006
dc.language.isoeng
dc.publisherWiley-Blackwell
dc.relation.ispartofRespirology
dc.rightsAcesso restrito
dc.rights.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dc.subjectcardiac outputen
dc.subjectchronic obstructive pulmonary diseaseen
dc.subjectexertionen
dc.subjectproportional assisted ventilationen
dc.subjectstroke volumeen
dc.titleHaemodynamic effects of proportional assist ventilation during high-intensity exercise in patients with chronic obstructive pulmonary diseaseen
dc.typeArtigo
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