CERVICAL LYMPH PRESSURE IN THE DOG

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Abstract
A method, involving passive motion of the head previously described for the maintenance of a constant cervical lymph flow in anesthetized dogs, was utilized for a study of cervical lymph pressure. Lateral lymph pressures, obtained by placing a T-cannula in one cervical lymph vessel, ranged from -2.8 to +3.2 cm. of water, with the majority of the pressures falling between +0.1 and +1.4 cm. Venous congestion, sufficient to produce an increased lymph flow, in 2 cases caused a slight increase in cervical lymph pressure and in 3 cases a slight decrease, the latter being most evident in one instance in which the negative thoracic pressure produced a demonstrable aspirating effect on the cervical lymphatics. Venous congestion during the local application of heat to the nasopharynx produced a more striking increase in cervical lymph flow than in cervical lymph pressure. End pressures, obtained by obstructing lymph flow, reached maximal values of 21.0 and 44.5 cm. of water. Normal cervical lymph pressures, in the absence of lymphatic obstruction, probably never reached values above a few cm. of water. Factors such as the negative thoracic pressure, size and elasticity of the lymphatic network, efficiency of the valves, and motion of the part tended to keep the pressure at a minimum.

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