Pharmacological assessment of the contribution of the arterial baroreflex to sympathetic discharge patterns in healthy humans

被引:16
|
作者
Limberg, Jacqueline K. [1 ,2 ]
Ott, Elizabeth P. [1 ]
Holbein, Walter W. [2 ]
Baker, Sarah E. [2 ]
Curry, Timothy B. [2 ]
Nicholson, Wayne T. [2 ]
Joyner, Michael J. [2 ]
Shoemaker, J. Kevin [3 ]
机构
[1] Univ Missouri, Dept Nutr & Exercise Physiol, 520 Hitt St, Columbia, MO 65211 USA
[2] Mayo Clin, Dept Anesthesiol & Perioperat Med, Rochester, MN USA
[3] Univ Western Ontario, Sch Kinesiol, London, ON, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
baroreflex; microneurography; modified Oxford technique; sympathetic outflow; NEURAL RECRUITMENT STRATEGIES; HUMAN MUSCLE NERVES; CHEMOREFLEX STRESS; NERVOUS-SYSTEM; BLOOD-PRESSURE; HEART-FAILURE; REFLEX; RESPONSES; NEURONS; LATENCY;
D O I
10.1152/jn.00935.2017
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
To study how changes in baroreceptor afferent activity affect patterns of sympathetic neural activation, we manipulated arterial blood pressure with intravenous nitroprusside (NTP) and phenylephrine (PE) and measured action potential (AP) patterns with wavelet-based methodology. We hypothesized that 1) baroreflex unloading (NTP) would increase firing of low-threshold axons and recruitment of latent axons and 2) baroreflex loading (PE) would decrease firing of low-threshold axons. Heart rate (HR, ECG), arterial blood pressure (BP, brachial catheter), and muscle sympathetic nerve activity (MSNA, microneurography of peroneal nerve) were measured at baseline and during steady-state systemic, intravenous NTP (0.5-1.2 mu g.kg(-1).min(-1), n = 13) or PE (0.2-1.0 mu g.kg(-1).min(-1), n = 9) infusion. BP decreased and HR and integrated MSNA increased with NTP (P < 0.01). AP incidence (326 +/- 66 to 579 +/- 129 APs/100 heartbeats) and AP content per integrated burst (8 +/- 1 to 11 +/- 2 APs/burst) increased with NTP (P < 0.05). The firing probability of low-threshold axons increased with NTP, and recruitment of high-threshold axons was observed (22 +/- 3 to 24 +/- 3 max cluster number, 9 +/- 1 to 11 +/- 1 clusters/burst: P < 0.05). BP increased and FIR and integrated MSNA decreased with PE (P < 0.05). PE decreased AP incidence (406 +/- 128 to 166 +/- 42 APs/100 heartbeats) and resulted in fewer unique clusters (15 +/- 2 to 9 +/- 1 max cluster number, P < 0.05); components of an integrated burst (APs or clusters per burst) were not altered (P > 0.05). These data support a hierarchical pattern of sympathetic neural activation during manipulation of baroreceptor afferent activity, with rate coding of active neurons playing the predominant role and recruitment/derecruitment of higher-threshold units occurring with steady-state hypotensive stress. NEW & NOTEWORTHY To study how changes in baroreceptor afferent activity affect patterns of sympathetic neural activation, we manipulated arterial blood pressure with intravenous nitroprusside and phenylephrine and measured sympathetic outflow with waveletbased methodology. Baroreflex unloading increased sympathetic activity by increasing firing probability of low-threshold axons (rate coding) and recruiting new populations of high-threshold axons. Baroreflex loading decreased sympathetic activity by decreasing the firing probability of larger axons (derecruitment); however, the components of an integrated burst were unaffected.
引用
收藏
页码:2166 / 2175
页数:10
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