Paralysis
of the Diaphragm
The phrenic nerve may be paralyzed because of pressure from
malignant tumors in the mediastinum. Surgical crushing or sectioning of the
phrenic nerve in the neck, producing paralysis of the diaphragm on one side,
was once used as part of the treatment of lung tuberculosis, especially of the
lower lobes. The immobile dome of the diaphragm rests the lung
Sympathetic
Trunk in the Treatment of Raynaud Disease
Preganglionic sympathectomy of the 2nd and 3rd thoracic ganglia
can be performed to increase the blood flow to the fingers for such conditions
as Raynaud disease. The sympathectomy causes vasodilatation of the arterioles
in the upper limb.
Spinal
Anesthesia and the Sympathetic Nervous System
A high spinal anesthetic may block the preganglionic
sympathetic fibers passing out from the lower thoracic segments of the spinal
cord. This produces temporary vasodilatation below this level, with a
consequent fall in blood pressure.
No comments:
Post a Comment