Correct Answer: C

Rationale: An inotropic agent is a medication that increases the force of the heart's contractions, which helps improve cardiac output. Choice A and B are incorrect as inotropic agents do not constrict or dilate vessels. Choice D is also incorrect as inotropic agents do not slow down the heart rate but rather enhance the heart's contractility.

Correct Answer: A

Rationale: Hypertension, obesity, smoking, and excessive stress are all modifiable risk factors for coronary artery disease, as they can be changed or controlled through interventions. Age, on the other hand, is a nonmodifiable risk factor, meaning it cannot be altered. Understanding the difference between modifiable and nonmodifiable risk factors is essential in preventive healthcare strategies.

Correct Answer: B

Rationale: During an acute asthma attack, the priority is to quickly relieve bronchospasm and improve breathing. Short-acting beta agonists, like albuterol, are the first-line medications as they rapidly relax bronchial muscles, providing immediate relief. Oral corticosteroids are used as adjunct therapy to reduce airway inflammation over time, while leukotriene receptor antagonists and long-acting beta agonists are not appropriate for immediate relief during an acute attack.

Correct Answer: D

Rationale: After a total hip replacement, clients should avoid bending at the waist past 90 degrees for at least 6 weeks to prevent dislocation of the hip prosthesis. Bending down to tie shoes involves significant hip flexion and should be avoided during the initial postoperative period to ensure proper healing and reduce the risk of complications.

Correct Answer: C

Rationale: The pain of a myocardial infarction (MI) is often accompanied by shortness of breath and feelings of fear or anxiety. Unlike stable angina, the pain of an MI typically lasts longer than 15 minutes and is not relieved by nitroglycerin. Additionally, it can occur without a known cause, unlike stable angina which often has a trigger such as exertion.