Effects of organic and inorganic nitrate on aortic and carotid haemodynamics in heart failure with preserved ejection fraction.
Eur J Heart Fail
; 19(11): 1507-1515, 2017 11.
Article
em En
| MEDLINE
| ID: mdl-28547861
ABSTRACT
AIMS:
To assess the haemodynamic effects of organic vs. inorganic nitrate administration among patients with heart failure with preserved ejection fraction (HFpEF). METHODS ANDRESULTS:
We assessed carotid and aortic pressure-flow relations non-invasively before and after the administration of 0.4 mg of sublingual nitroglycerin (n = 26), and in a separate sub-study, in response to 12.9 mmoL of inorganic nitrate (n = 16). Nitroglycerin did not consistently reduce wave reflections arriving at the proximal aorta (change in real part of reflection coefficient, 1st harmonic -0.09; P = 0.01; 2nd harmonic -0.045, P = 0.16; 3rd harmonic +0.087; P = 0.05), but produced profound vasodilatation in the carotid territory, with a significant reduction in systolic blood pressure (133.6 vs. 120.5 mmHg; P = 0.011) and a marked reduction in carotid bed vascular resistance (19 580 vs. 13 078 dynes · s/cm5 ; P = 0.001) and carotid characteristic impedance (3440 vs. 1923 dynes · s/cm5 ; P = 0.002). Inorganic nitrate, in contrast, consistently reduced wave reflections across the first three harmonics (change in real part of reflection coefficient, 1st harmonic -0.12; P = 0.03; 2nd harmonic -0.11, P = 0.01; 3rd harmonic -0.087; P = 0.09) and did not reduce blood pressure, carotid bed vascular resistance, or carotid characteristic impedance (P = NS).CONCLUSIONS:
Nitroglycerin produces marked vasodilatation in the carotid circulation, with a pronounced reduction in blood pressure and inconsistent effects on central wave reflections. Inorganic nitrate, in contrast, produces consistent reductions in wave reflections, and unlike nitroglycerin, it does so without significant hypotension or cerebrovascular dilatation. These haemodynamic differences may underlie the different effects on exercise capacity and side effect profile of inorganic vs. organic nitrate in HFpEF.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Aorta Torácica
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Resistência Vascular
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Vasodilatação
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Artérias Carótidas
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Nitroglicerina
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Compostos de Nitrogênio
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Insuficiência Cardíaca
Tipo de estudo:
Clinical_trials
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Diagnostic_studies
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Observational_studies
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Prognostic_studies
Limite:
Aged
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Female
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Humans
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Male
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Middle aged
Idioma:
En
Ano de publicação:
2017
Tipo de documento:
Article