Background. The early pathophysiological mechanisms of diastolic dysfunction are not understood well. Hydrogen sulfide is an important endogenous gaseous transmitter that can influence heart remodeling. The aim was to determine total plasma sulfide (TPS) levels, as a surrogate marker of hydrogen sulfide, in patients with mild diastolic dysfunction.

Methods. Total plasma sulfide and N-terminal pro brain-type natriuretic peptide (NT-proBNP) levels were determined in ambulatory patients with arterial hypertension or diabetes mellitus and echocardiographically mild to moderate diastolic dysfunction.

Results. Twenty-four patients were included: nine with normal diastolic function (Grade 0), eight with an impaired relaxation pattern (Grade 1), and seven with a pseudo-normalized pattern (Grade 2). TPS levels were highest in patients with normal diastolic function (Grade 0), and lowest in patients with Grade 2 diastolic dysfunction, with this difference between Grade 0 and Grade 2 showing statistical significance (p = 0.017). NT-proBNP levels showed the reverse behavior, with this difference again showing statistical significance (p = 0.042).

Conclusions. Total plasma sulfide levels decrease with worsening of diastolic function from normal to moderate diastolic dysfunction.

Key words: total plasma sulfide, hydrogen sulfide, arterial hypertension, diastolic dysfunction, echocardiography

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