Hypertensive/Microvascular Disease and COPD: a Case Control Study

AuthorsChew, S.K.H.
Colville, D
Piers, C.
Hutchinson, A.
Wong, A.
Luong, V.
Wong, T.Y.
McDonald, C.
TypeJournal Article (Original Research)
JournalKidney & Blood Pressure Research
PubMed ID26751964
Year of Publication2016
Download 368544_1.pdf (2.1 MB)
AbstractBACKGROUND/AIMS: This study tested the hypothesis that individuals with chronic obstructive pulmonary disease (COPD) have more small vessel disease and more severe disease than an age- and gender- matched hospital patient comparison group. METHODS: This was a single centre, case-control study of 151 individuals with COPD (FEV1/VC) < 0.7 recruited consecutively immediately after respiratory function tests at a Melbourne teaching hospital over a 4 month period in 2010. Controls were individuals with normal respiratory function tests recruited contemporaneously from the same centre. Retinal images were obtained with a nonmydriatic camera (KOWA or Canon CR5-45NM), deidentiifed and graded by two trained graders for microvascular retinopathy (Wong and Mitchell classification), and vessel calibre using a computer-assisted method and Knudtson's modification of the Parr-Hubbard formula. Differences in microvascular retinopathy and vessel calibre between COPD patients and the comparison group were examined using Fisher's exact test or the t test (StataCorp, Texas). RESULTS: Patients with COPD had more microvascular retinopathy (121, 80% and 76, 50%; OR 3.98, 95%CI 2.39 to 6.64) and more severe disease (42, 28% and 18, 12%; OR 2.85, 95% CI 1.55 to 5.23) than other hospital patients. COPD remained an independent determinant of microvascular retinopathy (OR 4.56, 95%CI 2.49 to 8.36) after adjusting for gender, hypertension, smoking, and diabetes duration. Retinal arterioles and venules were wider in patients with COPD than other hospital patients (mean difference +6.5microm, 95% confidence interval 1.4 to 11.6; and +17.4microm, 95%CI 9.4 to 25.5, respectively). Larger venules were more common in younger individuals (+0.6 microm, 0.1 to 1.17) with more cigarette exposure (+0.3 microm, 0.2 to 0.5) or a lower serum albumin (+23.0 microm, 6.0 to 40.0). Venular calibre was not different in current and former smokers (p=0.77). There were trends for venules to be larger with more severe COPD (lower FEV1/VC, p=0.09) and with CT-demonstrated emphysema (p=0.06). CONCLUSIONS: Hypertensive/microvascular disease is more common and more severe in patients with COPD. This is likely to contribute to the associated increase in cardiac risk.


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