For some time one has had access to and has been more or less familiar with facts relating to the autonomic nervous system. The difficulty has been in applying these well known facts clinically. The reason for this difficulty has been the lack of a suitable index enabling one to determine whether the sympathetic or the parasympathetic is dominant, or whether one is dealing with a mixed type in which the sympathetic is dominant for a brief period of time to be followed by a brief period in which the parasympathetic is dominant.
The importance of such an index is appreciated when it is realized that these three types—sympathetic, parasympathetic and mixed type—represent three constitutional types which are subject to artificial control by the physician through a suitable index rather than spontaneous control by nature. Each one of these three constitutional types has associated clinical conditions which often disappear when
JARVIS DC. CHANGES IN THE COLOR OF THE INTRANASAL MUCOUS MEMBRANE: AS A GUIDE TO THE STATUS OF THE SYMPATHETIC AND OF THE PARASYMPATHETIC SYSTEM. Arch Otolaryngol. 1935;21(2):131–141. doi:10.1001/archotol.1935.00640020140001
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