Abstract
When the sympathetic nerve supply (right recurrent cardiac nerve) to a ring of the pulmonary artery of the rabbit is stimulated repetitively in vitro at frequencies of 10/second or more, the following changes occur which are not seen after stimulation at lower frequencies. (1) The minimum number of pulses in a train needed to cause a just-detectable contractile response is reduced from a mean of 7 to unity; the higher the frequency of repetitive stimulation the fewer the number of repetitive pulses needed to effect this change. (2) The basal tone of the blood vessel exhibits fairly rapid, small, spontaneous fluctuations. (3) The resting or basal tone of the vessel slowly increases for 1/2 to 2 hours. It is speculated that changes 1 and 2 may be the result of an irreversible change in transmitter storage or release mechanisms.
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