A patient has difficulty in breathing. The nurse provides oxygen therapy to the patient, after which the patient feels better. Which principle is involved in this situation?

Choice A rationale:

Washing hands for 5 to 10 seconds prior to administering medication is indeed an important safety measure, but it is not specifically related to changing or applying a transdermal patch. Hand hygiene is crucial to prevent the spread of infection, but it doesn't directly address the process of applying a patch.

Choice B rationale:

Applying the patch over a non-hairy area within the patient's skin is the correct answer. This is crucial because hair can interfere with the adhesion of the patch, leading to inadequate drug absorption. The rationale behind this is to ensure that the medication is effectively delivered through the skin into the bloodstream without any barriers such as hair. It's also important to choose a site that is clean, dry, and free from cuts or irritation.

Choice C rationale:

Leaving the previous medication patch in place is not recommended. It's essential to remove the old patch before applying a new one to prevent accumulation of the medication and to ensure accurate dosing. Failing to remove the previous patch could lead to an overdose or altered drug effects.

Choice D rationale:

Ensuring that the patient is lying down is not a specific safety measure for changing or applying a transdermal patch. The patient's position doesn't directly impact the effectiveness of the patch or the safety of the application process.

The correct answer is choice B. Increased anteroposterior diameter of the chest.

Choice A rationale:

Petechiae on the chest (Choice A) are tiny red or purple spots that appear on the skin due to small blood vessel breakage. They are not typically associated with COPD and emphysema. Petechiae are more often related to conditions like thrombocytopenia or certain infections, where blood clotting is impaired.

Choice B rationale:

Increased anteroposterior diameter of the chest, often referred to as "barrel chest," is a characteristic finding in clients with COPD and emphysema. This occurs due to the hyperinflation of the lungs and the loss of elasticity in the lung tissues, which causes the chest to become rounded and the ribs to be positioned more horizontally.

Choice C rationale:

An oxygen saturation level of 96% (Choice C) is within the normal range for oxygen saturation. However, while it's important for clients with COPD to maintain adequate oxygen levels, this value doesn't specifically correlate with the client's symptoms of a wet cough and occasional shortness of breath.

Choice D rationale:

Respiratory alkalosis (Choice D) involves an increase in blood pH due to decreased levels of carbon dioxide (hypocapnia) caused by hyperventilation. While respiratory alkalosis can occur in clients with COPD due to compensatory hyperventilation, it is not a direct assessment finding related to the client's symptoms of a wet cough and occasional shortness of breath.