preload refers to

NCLEX-RN

NCLEX RN Exam Prep

1. What does preload refer to?

A. The volume of blood entering the left side of the heart
B. The volume of blood entering the right side of the heart
C. The pressure in the venous system that the heart must overcome to pump the blood
D. The pressure in the arterial system that the heart must overcome to pump the blood

Correct answer: B

Rationale: Preload refers to the volume of blood that enters the right side of the heart. This volume stretches the fibers in the heart before contraction. Preload is an essential factor in determining the force of ventricular contraction. Choices A, C, and D are incorrect. Choice A is incorrect because preload is specifically related to the volume of blood entering the right side of the heart. Choices C and D are incorrect as they refer to afterload, which is the pressure that the heart must overcome to pump blood out of the ventricles into the systemic or pulmonary circulation.

2. For a patient who is blood type AB, which blood product can they receive?

A. Plasma from a type B donor
B. Whole blood from a type A donor
C. Packed RBCs from a type O donor
D. All of the above

Correct answer: C

Rationale: A patient with blood type AB has AB antigens on their red blood cells. This means they can only receive blood products that are compatible with these antigens. Choice A is incorrect because an AB patient cannot receive plasma from a type B donor due to the antibodies present in type B plasma. Choice B is incorrect because an AB patient cannot receive whole blood from a type A donor as it contains incompatible antigens. Choice C is the correct answer because an AB patient can receive packed RBCs from a type O donor. Type O donors have no A or B antigens, making their blood compatible for transfusion to recipients with any blood type. Therefore, choices A and B are incorrect, and the correct choice is C.

3. Who is legally able to make decisions for the patient or resident during a patient care conference when the patient is not mentally able to make decisions on their own?

A. The patient or their healthcare proxy
B. Only the patient
C. Only the healthcare proxy
D. The doctor

Correct answer: C

Rationale: When a patient is unable to make decisions due to mental incapacity, the healthcare proxy, designated by the patient in advance, has the legal authority to make decisions on the patient's behalf. In this situation, the patient lacks the capacity to make decisions independently. The healthcare proxy's role is to represent the patient's wishes and best interests. The doctor's role in a patient care conference is to provide medical expertise, offer recommendations, and assist in the decision-making process, but the final decision-making authority lies with the healthcare proxy, not the doctor.

4. The Sinoatrial Node (SA) is located within which of the following heart structures?

A. Mitral Valve
B. Right Ventricle
C. Right Atrium
D. Left Atrium

Correct answer: C

Rationale: The Sinoatrial (SA) Node, often called the heart's natural pacemaker, is situated within the upper wall of the Right Atrium. It initiates the electrical impulses that regulate the heartbeat. Choices A, B, and D are incorrect because the SA node is not located in the Mitral Valve, Right Ventricle, or Left Atrium. It is specifically positioned in the Right Atrium to coordinate the heart's rhythm and timing.

5. When a nurse's hand comes in contact with a client's blood after providing wound care, what is the next action the nurse should take?

A. Use an alcohol-based hand sanitizer to disinfect the hands
B. Wash hands with soap and water using appropriate technique
C. Notify the appropriate personnel about the exposure to client's blood
D. Sample some of the client's blood to determine the presence of diseases

Correct answer: B

Rationale: When a nurse's hand comes in contact with a client's blood, it is important to follow appropriate infection control measures. Using an alcohol-based hand sanitizer is not sufficient in this scenario as the blood is a visible contaminant. The best practice is to wash hands with soap and water using appropriate technique to ensure thorough cleansing and removal of any potential pathogens. Notifying the appropriate personnel about the exposure is important for documentation and further evaluation, but immediate hand hygiene is crucial. Sampling the client's blood for disease determination is not within the nurse's scope of practice and is unnecessary in this situation.