References
Monitoring lung function in patients with chronic graft versus host disease: a pilot study
Abstract
Bronchiolitis obliterans syndrome (BOS) following allogenic haematopoietic stem cell transplant is considered the manifestation of chronic graft versus host disease (cGvHD) in the lung, and affects about 14% of patients with cGvHD, mainly in the first 2 years after transplant. Despite advances in assessment, diagnosis and treatment, the clinical prognosis remains poor for patients with pulmonary manifestations of cGvHD. A pilot study of 50 patients was devised to establish whether a relationship exists between forced expiratory volume in 1 second (FEV1) via pulmonary function test (PFT) and the equivalent peak expiratory flow (PEF) via peak flow handheld spirometry in cGvHD patients receiving extracorporeal photopheresis (ECP). Only PEF observed within 2 days of PFT could be compared with data at month 3, 6, 9 and 12. This pilot study illustrated that monitoring via handheld peak flow readings has the potential to become an acceptable method of monitoring lung function longitudinally in cGvHD patients.
Bronchiolitis obliterans syndrome (BOS) following allogenic haematopoietic stem cell transplant (HSCT) is considered the manifestation of chronic graft versus host disease (cGvHD) in the lung (Del Fante and Perotti, 2017). BOS affects about 14% of patients with cGvHD, mainly in the first 2 years following transplant (Au et al, 2011) and is one of the most frequent late-onset non-infectious pulmonary complications following HSCT (Del Fante and Perotti, 2017). BOS is characterised by progressive airflow obstruction in the absence of respiratory infection, which significantly affects patients' quality of life (Yoshihara et al, 2007; Amin et al, 2015). In the early stages of pulmonary cGvHD, although some patients may be asymptomatic the majority often present with non-specific symptoms such as mild dyspnoea on exertion or a dry, non-productive cough (Hildebandt et al, 2011). It was suggested by Efrati et al (2008) that functional and structural changes occur earlier than the manifestation of clinical symptoms and subsequent physical impairment. Pulmonary complications occurring following allogeneic HSCT substantially contribute to morbidity and late mortality in patients presenting with impaired lung function (Palmer, 2016).
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