Associations of marijuana with markers of chronic lung disease in people living with HIV

OBJECTIVES

The relationship between marijuana use and markers of chronic lung disease in people living with HIV (PLWH) is poorly understood.

METHODS

We performed a cross-sectional analysis of the Examinations of HIV-Associated Lung Emphysema (EXHALE) study, including 162 HIV-positive patients and 138 participants without HIV. We modelled marijuana exposure as: (i) current daily or weekly marijuana smoking vs. monthly or less often; or (ii) cumulative marijuana smoking (joint-years). Linear and logistic regression estimated associations between marijuana exposure and markers of lung disease, adjusted for tobacco smoking and other factors.

RESULTS

In PLWH, current daily or weekly marijuana use was associated with a larger forced vital capacity (FVC), larger total lung capacity and increased odds of radiographic emphysema compared with marijuana non-smokers in adjusted models; these associations were not statistically significant in participants without HIV. Marijuana joint-years were associated with higher forced expiratory volume in 1 s and FVC in PLWH but not with emphysema.

CONCLUSIONS

In PLWH, marijuana smoking was associated with higher lung volumes and potentially with radiographic emphysema. No consistently negative associations were observed between marijuana and measures of chronic lung health.

0596 Providers Rarely Assess Obstructive Sleep Apnea Symptoms Among Patients with Chronic Obstructive Pulmonary Disease

Introduction

Professional societies recommend providers assess sleep symptoms in COPD, but it is unclear if this occurs. We aimed to evaluate OSA symptom assessment and documentation among patients with COPD, and the patient and provider characteristics associated with this assessment.

Methods

We conducted a cross-sectional study of adults aged ≥40 years with clinically diagnosed COPD and no prior diagnosis of OSA. We selected patients receiving care at two academic general internal medicine clinics between 6/1/2011 - 6/1/2013. We abstracted charts to assess how often OSA symptoms such as snoring, somnolence, witnessed apneas, or gasping/choking arousals were documented as present or absent. We performed multivariable mixed-effects logistic regression to assess associations of patient and primary care provider (PCP) factors with assessment of OSA symptoms. Patient factors included demographics, body mass index, comorbidities, healthcare utilization, and severity of COPD, and PCP factors including demographics, degree, and years of experience.

Results

Of 523 patients with COPD, only 26 (5.0%) had documentation of OSA symptom assessment within a one-year period. In mixed effects models, only referral to general pulmonary clinic was associated with the assessment of OSA symptoms (OR: 4.56, 95% CI 1.28-15.52). Among the 26 individuals who had OSA symptoms assessed, 9 (34.6%) reported snoring, 15 (57.7%) reported daytime somnolence, 2 (7.7%) reported gasping/choking arousals, and 5 (19.2%) reported witnessed apneas. Among those assessed for OSA symptoms, providers referred 11 (42.3%) for formal sleep consultation.

Conclusion

Providers rarely document OSA symptoms for patients with COPD in primary care clinic, but assessment is greater among those with pulmonary specialty consultation. Given time constraints in primary care, external facilitation of sleep symptom assessment may improve symptom recognition and receipt of appropriate services.

Support

NIH 5K23HL111116-05, VA Center of Innovation for Veteran-Centered and Value-Driven Care.