Unrecognized glucose intolerance is common in pulmonary arterial hypertension.

Pugh ME, Robbins IM, Rice TW, West J, Newman JH, Hemnes AR
J Heart Lung Transplant. 2011 30 (8): 904-11

PMID: 21493097 · PMCID: PMC3129440 · DOI:10.1016/j.healun.2011.02.016

BACKGROUND - Animal and human data suggest insulin resistance is common in pulmonary arterial hypertension (PAH). Although routine assessment of insulin resistance is difficult, hemoglobin A(1c) (HbA(1c)) is a sensitive test to detect diabetes mellitus (DM) and those at high risk for DM. We aimed to define the prevalence of elevated HbA(1c) in PAH patients and to correlate HbA(1c) levels with functional assessment.

METHODS - HbA(1c) was measured in 41 PAH patients without a diagnosis of DM, along with demographic, functional, and hemodynamic data. Using published criteria, HbA(1c) ≤ 5.9% defined normal, 6.0% to 6.4% was glucose intolerance, and ≥ 6.5% was DM.

RESULTS - Twenty-three patients (56%) had HbA(1c) ≥ 6.0%, and 6 (15%) had unrecognized DM (HbA(1c) ≥ 6.5%). Age and body mass index were similar in patients with HbA(1c) ≥ 6.0% vs < 6.0%. There was a trend towards lower mean 6-minute walk distance in patients with elevated HbA(1c) (331.0 ± 126.6 vs 413.6 ± 74.9 meters, p = 0.07). The 6-month event-free survival was not significantly different in patients with elevated HbA(1c).

CONCLUSIONS - Unrecognized glucose intolerance as assessed by HbA(1c) is common in PAH. Further studies are needed to discern if glucose or insulin dysregulation mediates PAH pathogenesis or is secondary to advanced PAH.

Copyright © 2011 International Society for Heart and Lung Transplantation. Published by Elsevier Inc. All rights reserved.

MeSH Terms (15)

Adult Aged Blood Pressure Comorbidity Female Glucose Intolerance Glycated Hemoglobin A Humans Hypertension, Pulmonary Insulin Resistance Kaplan-Meier Estimate Male Middle Aged Prevalence Prospective Studies

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