Nursing HDP401 Lecture Notes - Lecture 5: Central Retinal Vein, Cerebral Circulation, Lumbar Puncture

• School: Seneca College
• Department: Nursing
• Course: Nursing HDP401
• Professor: martingalloway

Document Summary

Sns is stimulated by the increase in icp d/t the stress response but since the. Sns arises from the thoracic and lumbar spinal nerves it will not be affected by and increase in icp. There will be powerful stimulation of radial iris muscles (full dilation). Icp rises in causes an increase in csf pressure and translates throughout the subarachnoid space. Leads to uncoordinated eye movements leading to diplopia (double vision: cvs changes rising icp leading to decreased cerebral circulation will lead to a severe stress response by the hypothalamus. Sns output causes peripheral vasoconstriction (increased pvr) which increases bp. This will temporarily be enough to overcome the icp and restore blood flow but will also exacerbate the icp. At the same time peripheral baroreceptors in the aorta and carotid will detect the increased bp and respond by signalling the cardiac control centre (in medulla) to decrease hr.