Statin restores cardiac autonomic response to acute hypoxia in hypercholesterolaemia
Brasileiro-Santos, Maria do Socorro [UNIFESP]
Barreto-Filho, Jose A. S.
Santos, Raul D.
Chacra, Ana P. M.
Sangaleti, Carine Teles
Alvez, Gisele [UNIFESP]
Bezerra, Otavio Coelho
Bortoloto, Luiz Aparecido
Irigoyen, Maria C. [UNIFESP]
Consolim-Colombo, Fernanda M.
Is part ofEuropean Journal of Clinical Investigation
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BackgroundHypercholesterolaemia may alter cardiovascular autonomic function. We investigated the autonomic cardiovascular regulation during normoxia and hypoxia in familial isolated HC patients with or without statin treatment.Materials and methodsLow (LF-RR) and high (HF-RR) components of spectral analysis of RR interval and systolic arterial pressure (LF-SAP) were obtained during 5min of normoxia and isocapnic hypoxia (10% O-2) in 10 normotensive familial HC patients without medication, in seven HC patients after a 12-week treatment period with 40mg of simvastatin (HC+SVT) and in eight matched normal volunteers (CO).ResultsThe HC patients had significant impairment of cardiac autonomic modulation parameters compared with CO at normoxia, which was maintained or even accentuated during hypoxia; these parameters included lower total variance of RR, increased normalized LF-RR, decreased normalized HF-RR, increased LF-RR/HF-RR ratio, higher LF-SAP component and reduced index. However, the HC+SVT group had a significant improvement in all parameters: the LF-RR and LF-SAP decreased (indicating a decrease in cardiac and vascular sympathetic activity), the HF-RR increased (indicating an increase in parasympathetic activity) and the spontaneous baroreflex sensitivity improved. These changes were detected at normoxia and were maintained during hypoxia.ConclusionsOur data are the first to show that isolated HC is characterized by an increase in cardiac and vasomotor sympathetic drive, a decrease in cardiac vagal modulation and baroreflex impairment during normoxia and hypoxia. in addition, our data suggest that statin treatment has a potential role in restoring the physiological cardiovascular autonomic control at baseline and during cardiovascular challenge.
CitationEuropean Journal of Clinical Investigation. Hoboken: Wiley-Blackwell, v. 43, n. 12, p. 1291-1298, 2013.
SponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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