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Cardiovasc Res. 2018 Jun 1;114(7):954-964. doi: 10.1093/cvr/cvy038.

Multiple common comorbidities produce left ventricular diastolic dysfunction associated with coronary microvascular dysfunction, oxidative stress, and myocardial stiffening.

Author information

1
Division of Experimental Cardiology, Department of Cardiology, The Thoraxcentre, Cardiovascular Research School COEUR, Erasmus University Medical Center, Rotterdam, The Netherlands.
2
Turku PET Centre, University of Turku and Turku University Hospital, Turku, Finland.
3
Department of Radiology, Cardiovascular Research School COEUR, Erasmus University Medical Center, Rotterdam, The Netherlands.
4
Department of Nephrology and Hypertension, University Medical Center Utrecht, Utrecht, The Netherlands.
5
Department of Internal Medicine, Cardiovascular Research School COEUR, Erasmus University Medical Center, Rotterdam, The Netherlands.
6
Department of Cardiology, Maastricht University, Maastricht, The Netherlands.
7
Department of Physiology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, The Netherlands.
8
Department of Physiology, Amsterdam Cardiovascular Sciences (ACS), VU University Medical Center Amsterdam, Amsterdam, The Netherlands.
9
Institute of Physiology II, University of Muenster, Muenster, Germany.
10
Netherlands Heart Institute, Utrecht, The Netherlands.

Abstract

Aims:

More than 50% of patients with heart failure have preserved ejection fraction characterized by diastolic dysfunction. The prevalance of diastolic dysfunction is higher in females and associates with multiple comorbidities such as hypertension (HT), obesity, hypercholesterolemia (HC), and diabetes mellitus (DM). Although its pathophysiology remains incompletely understood, it has been proposed that these comorbidities induce systemic inflammation, coronary microvascular dysfunction, and oxidative stress, leading to myocardial fibrosis, myocyte stiffening and, ultimately, diastolic dysfunction. Here, we tested this hypothesis in a swine model chronically exposed to three common comorbidities.

Methods and results:

DM (induced by streptozotocin), HC (produced by high fat diet), and HT (resulting from renal artery embolization), were produced in 10 female swine, which were followed for 6 months. Eight female healthy swine on normal pig-chow served as controls. The DM + HC + HT group showed hyperglycemia, HC, hypertriglyceridemia, renal dysfunction and HT, which were associated with systemic inflammation. Myocardial superoxide production was markedly increased, due to increased NOX activity and eNOS uncoupling, and associated with reduced NO production, and impaired coronary small artery endothelium-dependent vasodilation. These abnormalities were accompanied by increased myocardial collagen content, reduced capillary/fiber ratio, and elevated passive cardiomyocyte stiffness, resulting in an increased left ventricular end-diastolic stiffness (measured by pressure-volume catheter) and a trend towards a reduced E/A ratio (measured by cardiac MRI), while ejection fraction was maintained.

Conclusions:

The combination of three common comorbidities leads to systemic inflammation, myocardial oxidative stress, and coronary microvascular dysfunction, which associate with myocardial stiffening and LV diastolic dysfunction with preserved ejection fraction.

PMID:
29432575
PMCID:
PMC5967461
DOI:
10.1093/cvr/cvy038
[Indexed for MEDLINE]
Free PMC Article

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