Evaluation of bendopnea in severe obstructive sleep apnea syndrome

Background: Bendopnea is a symptom described in heart failure (HF) that is related to short-term prognosis; however, its frequency and characteristics in respiratory diseases such as OSAS is still unknown. This study was carried out to evaluate the prevalence of bendopnea in patients with severe obstructive sleep apnea syndrome (OSAS) METHODS: We conducted a study of 95 patients attending a sleep disorders unit with severe OSAS. Bendopnea was considered when shortness of breath occurred within 30s of bending forward.

Results: Bendopnea was present in 33/95 of the patients included (34.7%). The median age was 62 years (52-71), 65 were men (68.4%), with a median weight of 92 (81-107) and BMI of 34kg/m² (±7.1). The median duration of shortness of breath was 5s (2-10). The presence of bendopnea was related to age (p<.0001), obesity (p .004), respiratory diseases (p .01) and HF (p .03). Admission rate was higher in those with bendopnea without reaching statistical significance.

Conclusion: One-third of patients with severe OSAS present bendopnea. This symptom is related to a higher prevalence of comorbidities (HF, obesity and other respiratory diseases). It is also related to a higher CT90.

Keywords: Enfermedad pulmonar intersticial; Enfermedad pulmonar rara; Interstitial lung disease; Proteinosis alveolar pulmonar; Pulmonary alveolar proteinosis; Rare lung disease.