A 65-Year-Old Male Is Intubated and Placed on a Mechanical

question 16

Multiple Choice

A 65-year-old male is intubated and placed on a mechanical ventilator after a motor vehicle accident.Thirty-six hours later he develops infiltrates on the chest radiograph.Which of the following actions may have been able to prevent this from occurring?
1) Elevation of the head of the bed 20 to 30 degrees
2) Aspiration of subglottic secretions
3) Changing ventilator circuit every 24 hours
4) Stress ulcer prophylaxis
5) Avoid the use of sedatives

• A) 1 only
• B) 1,3,and 5
• C) 1,2,4,and 5
• D) 1,2,3,4,and 5

---

Definitions:

Homozygotes

Individuals having two identical alleles for a specific gene, resulting in the expression of that genetic trait.

Negative Frequency-Dependent Selection

Negative frequency-dependent selection occurs when rare genotypes have a fitness advantage simply because they are rare, helping to maintain genetic diversity within populations.

Pleiotropy

The genetic phenomenon where a single gene influences multiple phenotypic traits, demonstrating the complex nature of gene action.

Foraging Strategy

The behavioral patterns and techniques employed by animals, including humans, to find and gather food.