Airway Bacterial Load and Inhaled Antibiotic Response in Bronchiectasis
Por:
Sibila, O, Laserna, E, Shoemark, A, Keir, HR, Finch, S, Rodrigo-Troyano, A, Perea, L, Lonergan, M, Goeminne, PC, Chalmers, JD
Publicada:
1 jul 2019
Resumen:
Rationale: The principal underlying inhaled antibiotic treatment in bronchiectasis is that airway bacterial load drives inflammation, and therefore antibiotic treatment will reduce symptoms.
Objectives: To determine the relationship between bacterial load and clinical outcomes, assess the stability of bacterial load over time, and test the hypothesis that response to inhaled antibiotics would be predicted by baseline bacterial load.
Methods: We performed three studies. Studies 1 and 2 were prospective studies including adults with bronchiectasis. Study 3 was a post hoc analysis of a randomized trial of inhaled aztreonam. A priori patients were divided into low (<10(5) cfu/g), moderate (10(5)-10(6) cfu/g), and high bacterial load (>= 10(7) cfu/g) using quantitative sputum culture.
Measurements and Main Results: Bacterial load was a stable trait associated with worse quality of life and more airway inflammation in studies 1, 2, and 3. In study 3, patients with high bacterial load showed an improvement in the primary endpoint (Quality of Life-Bronchiectasis-Respiratory Symptoms Score at Week 4) in favor of aztreonam (mean difference of 9.7 points; 95% confidence interval, 3.4-16.0; P = 0.003). The proportion of patients who achieved an increase above the minimum clinically important difference was higher in the aztreonam group at Week 4 (63% vs. 37%; P = 0.01) and at Week 12 (62% vs. 38%; P = 0.01) only in high bacterial load patients.
Conclusions: Improvement of quality of life with inhaled aztreonam was only evident in patients with high bacterial load. Bacterial load may be a useful biomarker of severity of disease and treatment response.
Filiaciones:
Sibila, O:
Hosp Santa Creu & Sant Pau, Resp Dept, Barcelona, Spain
Biomed Res Inst St Pau, Barcelona, Spain
Laserna, E:
Hosp Comarcal Mollet, Mollet Del Valles, Spain
Shoemark, A:
Univ Dundee, Scottish Ctr Resp Med, Dundee, Scotland
Keir, HR:
Univ Dundee, Scottish Ctr Resp Med, Dundee, Scotland
Finch, S:
Univ Dundee, Scottish Ctr Resp Med, Dundee, Scotland
Rodrigo-Troyano, A:
Hosp Santa Creu & Sant Pau, Resp Dept, Barcelona, Spain
Biomed Res Inst St Pau, Barcelona, Spain
Perea, L:
Biomed Res Inst St Pau, Barcelona, Spain
Lonergan, M:
Univ Dundee, Scottish Ctr Resp Med, Dundee, Scotland
Goeminne, PC:
AZ Nikolaas, Dept Resp Med, St Niklaas, Belgium
UZ Leuven, Dept Resp Med, Leuven, Belgium
Chalmers, JD:
Univ Dundee, Scottish Ctr Resp Med, Dundee, Scotland
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