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Reciprocal dysautonomia. Baroreceptor activation inhibits the chemoreceptor reflex and vice-versa. A: chemoreceptor stimulation. Ventilatory responses to intracarotid nicotine were reduced significantly at high carotid perfusion pressures [from Heistad et al. (31)]. B: SNA in a hypertensive subject is markedly increased with apnea and hypoxia. The increase is abrogated by neck suction [from Somers et al. (73)] (see also Ref. 74).
