1. A patient with a history of chronic obstructive

pulmonary disease (COPD) is admitted to the hospital with

an acute exacerbation. The nurse is preparing to administer

oxygen therapy to the patient. Which of the following is the

most appropriate oxygen delivery device for this patient?

a) Nasal cannula

b) Simple face mask

c) Non-rebreather mask

d) Venturi mask*

Rationale: A Venturi mask delivers a precise concentration

of oxygen and is suitable for patients with COPD who are

at risk of carbon dioxide retention. A nasal cannula, a

simple face mask, and a non-rebreather mask deliver

variable concentrations of oxygen and may cause

respiratory depression in patients with COPD.

2. A patient with a history of diabetes mellitus is scheduled

for a colonoscopy. The patient is instructed to take a bowel

preparation solution the night before the procedure. The

nurse reviews the patient's medication list and notes that

the patient is taking metformin. What is the most

appropriate nursing action in this situation?

a) Instruct the patient to continue taking metformin as

prescribed

b) Instruct the patient to stop taking metformin 48 hours

before the procedure*

c) Instruct the patient to take half the dose of metformin on

the day of the procedure

d) Instruct the patient to resume taking metformin after the