A nurse is reviewing a client's ECG rhythm strip. Which of the following components should the nurse use to measure impulse conduction from the sinus node through the atrioventricular node?

OST segment

PP interval

PR interval

QRS complex

Answer and Explanation

The Correct Answer is C

A. The ST segment represents the time between ventricular depolarization and the beginning of repolarization. It does not measure conduction through the atria or AV node.
B. The PP interval measures the distance between atrial depolarizations (P waves) and is used to assess atrial rhythm, not conduction time.
C. The PR interval measures the time from the beginning of atrial depolarization (P wave) to the beginning of ventricular depolarization (QRS complex). It reflects impulse conduction from the sinus node through the atria, AV node, and His-Purkinje system, making it the correct answer.
D. The QRS complex represents ventricular depolarization, not the conduction time through the atria or AV node.

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Correct Answer is C

Explanation

A. PICC lines are typically inserted into veins in the upper extremity (e.g., basilic or cephalic vein), not the lower extremities.
B. A 10 mL syringe (or larger) is recommended to flush PICC lines to avoid excessive pressure that could damage the catheter; a 3 mL syringe generates too much pressure.
C. Flushing the PICC line with 0.9% sodium chloride (normal saline) after medication administration is standard practice to maintain catheter patency and prevent clotting.
D. Pneumothorax is a potential complication of central venous catheters inserted in the subclavian or jugular veins, not typically with PICC lines, as they are inserted peripherally.

A. It maintains sterile technique. B. It ensures the IV line is clear of air before administration. after the procedure." C. It verifies the IV line is working properly. D. It minimizes the risk for medication errors.

Correct Answer is C

Explanation

A. While sterile technique is important during IV care, flushing the IV is not primarily for maintaining sterility.
B. Flushing can help clear air, but its main purpose is not air removal.
C. Flushing the IV line before and after medication administration helps verify patency (that the line is working properly) and ensures that the entire medication dose is delivered.
D. Flushing can help reduce medication interactions, but it is not specifically a method to minimize medication errors.

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A nurse is reviewing a client's ECG rhythm strip. Which of the following components should the nurse use to measure impulse conduction from the sinus node through the atrioventricular node?

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