Desaturation during the 3-minute step test predicts impaired 12-month outcomes in adult patients with cystic fibrosis.
Respir Care
; 56(8): 1137-42, 2011 Aug.
Article
em En
| MEDLINE
| ID: mdl-21496365
ABSTRACT
BACKGROUND:
The 3-minute step test is a simple test of exercise capacity for children with cystic fibrosis (CF), but no data have been reported regarding its usefulness in adults or its prognostic value.OBJECTIVE:
To determine the feasibility and acceptability of the 3-minute step test as a test of exercise capacity in adults with CF and whether test performance is associated with 12-month clinical outcomes.METHODS:
From our out-patient clinic we prospectively recruited consecutive adult patients with CF in stable health. The 3-minute step test was conducted with a standardized protocol that included a 15-cm high step and external pacing at 30 steps/min. We measured heart rate, dyspnea, and S(pO(2)). With multiple linear regression analyses we assessed the relationships between step-test performance and change in FEV(1) and hospital days at 12 months.RESULTS:
The participants were 101 adults 56 male, mean ± SD age 29 ± 9 years, percent-of-predicted FEV(1) 61 ± 23%, body mass index 22 ± 4 kg/m(2). Only 42% of the participants with mild CF achieved 70% of the predicted maximum heart rate during the 3-minute step test, compared to 77% of those with FEV(1) < 60% of predicted. The 22 patients who desaturated to < 90% during the 3-minute step test had a larger number of hospital days over the following 12 months than did those who did not (median 28 d vs 11 d, P < .001). Those who desaturated also had a greater FEV(1) decline (mean difference -117 mL, 95% CI -215 to -19 mL). Desaturation during the 3-minute step test was an independent predictor of both FEV(1) decline and days spent in hospital.CONCLUSIONS:
Desaturation during the 3-minute step test is associated with long-term pulmonary deterioration and more hospital days in adults with CF. The 3-minute step test may be a useful screening test for patients with moderate to severe CF lung disease, who require increased intervention and monitoring.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Testes de Função Respiratória
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Volume Expiratório Forçado
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Tolerância ao Exercício
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Fibrose Cística
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Terapia por Exercício
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Pulmão
Tipo de estudo:
Guideline
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Observational_studies
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Prognostic_studies
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Risk_factors_studies
Limite:
Adolescent
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Adult
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Revista:
Respir Care
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Austrália