A patient was admitted to the hospital with chronic obstructive pulmonary disease. His PO2 was 55 and PCO2 was 65. A new resident orders 54% oxygen via the venturi mask
One hour later, after the oxygen was placed, the nurse finds the patient with no respiration or pulse. She calls for a Code Blue and begins cardiopulmonary resuscitation (CPR). Explain why the patient stopped breathing.
What will be an ideal response
In people who retain carbon dioxide because of pulmonary disease, arterial PCO2 is chronically elevated and chemoreceptors become unresponsive to this chemical stimulus. In such cases, declining PO2 levels act on the oxygen-sensitive peripheral chemoreceptors and provide the principle respiratory stimulus, or the so-called hypoxic drive. Pure oxygen will stop a person's breathing, because his respiratory stimulus (low PO2 levels) would be removed.
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Why does hair turn gray or white in older individuals?
What will be an ideal response?
The denticulate ligament:
A) is a modification of the pia mater B) is found between all dorsal and ventral roots C) attaches to the dural sac continuously D) has its terminal attachment at S2 E) holds the redicular arteries in place
There is a small "bump" or swelling with a hole in it in the medial canthus. This structure is called a lacrimal caruncle. Where would we find another caruncle?
a. on the soft palate b. under the tongue c. in the nasal cavity d. in the duodenum
Extensibility refers to the ability of a muscle to stretch.
Answer the following statement true (T) or false (F)