A nurse is reviewing the electrocardiogram (ECG) results. Which portion of the conduction system does the nurse consider when evaluating the P wave?

SA node

AV node

Bundle of His

Purkinje fibers

Answer and Explanation

The Correct Answer is A

A. The P wave represents atrial depolarization, which is initiated by the SA node, the heart's natural pacemaker.
B. The AV node is responsible for conducting impulses from the atria to the ventricles but does not initiate the P wave.
C. The Bundle of His transmits the electrical impulses to the ventricles but is not directly associated with the P wave.
D. Purkinje fibers are involved in ventricular depolarization, which corresponds to the QRS complex, not the P wave.

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Correct Answer is D

Explanation

A. Chest physiotherapy is used to mobilize secretions and improve lung function, not specifically for increasing stroke volume or preload.
B. Diuretics would decrease preload by removing excess fluid, which is counterproductive in a patient with inadequate stroke volume related to decreased preload.
C. Vasodilators can further decrease preload and are not appropriate in this scenario where preload needs to be increased.
D. Intravenous (IV) fluids are administered to increase preload and improve stroke volume by enhancing the circulating blood volume.

A. Communication signs for airborne precautions B. Surgical mask, gown, gloves, eyewear C. N95 respirator, gown, gloves, eyewear D. Negative-pressure airflow in room E. Private room F. Communication sign for droplet precautions

Correct Answer is A,C,D,E

Explanation

A. Communication signs for airborne precautions are necessary to inform staff and visitors about the required precautions for TB, which is spread via airborne transmission.

B. A surgical mask is not adequate for TB; instead, an N95 respirator is required to filter out the airborne particles effectively.

C. The N95 respirator, gown, gloves, and eyewear are essential personal protective equipment for caring for a patient with tuberculosis. The N95 respirator specifically protects against inhaling infectious particles.

D. Negative-pressure airflow in the room is critical for tuberculosis patients to prevent airborne contaminants from spreading to other areas of the facility.

E. A private room is required to isolate the patient and reduce the risk of transmission to other patients and staff.

F. A communication sign for droplet precautions is not applicable as tuberculosis is primarily transmitted via airborne routes, not droplet transmission.

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A nurse is reviewing the electrocardiogram (ECG) results. Which portion of the conduction system does the nurse consider when evaluating the P wave?

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