Abstract
Increased cardiac sympathetic nerve activity (CSNA) is a key feature of heart failure (HF) and is associated with poor outcome. There is evidence that central angiotensinergic mechanisms contribute to the increased CSNA in HF, but the central sites involved are unknown. In an ovine, rapid pacing model of HF, we investigated the contribution of the lamina terminalis and area postrema to the increased CSNA and also the responses to fourth ventricular infusion of the angiotensin type 1 receptor antagonist losartan. Ablation of the area postrema or sham lesion (n = 6/group), placement of lamina terminalis lesion electrodes (n = 5), and insertion of a cannula into the fourth ventricle (n = 6) were performed when ejection fraction was ~ 50%. When ejection fraction was < 40%, recording electrodes were implanted, and after 3 days, resting CSNA and baroreflex control of CSNA were measured before and following lesion of the lamina terminalis, in groups with lesion or sham lesion of the area postrema and before and following infusion of losartan (1.0 mg/h for 5 h) into the fourth ventricle. In conscious sheep with HF, lesion of the lamina terminalis did not significantly change CSNA (91 ± 2 vs. 86 ± 3 bursts/100 heart beats), whereas CSNA was reduced in the group with lesion of the area postrema (89 ± 3 to 45 ± 10 bursts/100 heart beats, P < 0.01) and following fourth ventricular infusion of losartan (89 ± 3 to 48 ± 8 bursts/100 heartbeats, P < 0.01). These findings indicate that the area postrema and brainstem angiotensinergic mechanisms may play an important role in determining the increased CSNA in HF.
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The authors acknowledge the expert technical assistance of Anthony Dornom and Tom Vale.
Funding
This work was supported by National Health and Medical Research Council of Australia (NHMRC) (APP1128108) and the Victorian Government’s Operational Infrastructure Support Program. L. C. Booth was the recipient of a NHMRC Early Career Fellowship (1054619).
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Abukar, Y., Ramchandra, R., Hood, S.G. et al. Increased cardiac sympathetic nerve activity in ovine heart failure is reduced by lesion of the area postrema, but not lamina terminalis. Basic Res Cardiol 113, 35 (2018). https://doi.org/10.1007/s00395-018-0695-9
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DOI: https://doi.org/10.1007/s00395-018-0695-9