A Patient Is Placed on 50% Oxygen by Mask with Some

question 18

Multiple Choice

A patient is placed on 50% oxygen by mask with some relief of her dyspnea. Another arterial blood gas is obtained to evaluate lung function, which shows a PaO₂ of 120 mm Hg. If the previous PaO₂ on room air was 85 mm Hg, has lung function improved from the previous assessment?

• A) Yes
• B) No

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Definitions:

Oldowan

Relating to or denoting the earliest known stone tool industry, characterized by simple, mostly unifacial core and flake tools used by early humans.

Acheulean Technology

An archaeological term referring to a stone tool industry characterized by distinctive oval and pear-shaped hand-axes associated with early humans, particularly Homo erectus, dating from the Lower Paleolithic era.

Evolution

The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth, driven by natural selection, genetic drift, mutations, and gene flow.

Brain Evolution

The process through which changes occur over time in the brain structure of different species, contributing to the diversity of cognitive abilities and behaviors.