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I remember vaguely that sometime about 1935 there appeared in Tubercle the observations of two experimenters who, having shaved one side of rabbits' chests, painted the shaved areas with strong tincture of iodine. Postmortem examinations, some hours (or perhaps days) later, revealed that the lungs on the desecrated sides were more congested with blood than those opposite. As the iodine could not possibly have penetrated through the chest wall to the lung tissue, the effect seemed likely to be caused by a segmental reflex arc from the irritated cutaneous nerve endings to their deep autonomic counterparts.
This phenomenon seemed to link up with the observations of Batty Shaw (circa 1930?) in the Brompton Hospital Reports. It was noted that a significantly high percentage of young tuberculous patients presenting with an initial hemoptysis gave a recent history of sunbathing, thus "confirming" a long-held belief that sunbathing was contraindicated in pulmonary tuberculosis
Day G. Pulmonary Blood Volume in Health and Disease.. Arch Intern Med. 1969;124(2):259–260. doi:10.1001/archinte.1969.00300180131045
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