The nurse who is working in the telemetry unit measures the PR interval of the client's rhythm strip depicted below. What is the nurse's analysis of the PR interval?
Atria is taking longer to depolarize and contract
Conduction time is slowed from the SA node to the ventricles
The PR interval is within the normal time limits
Ventricular repolarization is delayed
The Correct Answer is C
A. Atria is taking longer to depolarize and contract: This would be indicated by a prolonged or abnormal P wave, not a normal PR interval. The rhythm strip shows clearly visible, normal-appearing P waves followed by QRS complexes, ruling this out as the correct interpretation.
B. Conduction time is slowed from the SA node to the ventricles: A slowed conduction time would result in a PR interval longer than 0.20 seconds, characteristic of first-degree AV block. The PR interval on this strip measures within the standard range (0.12–0.20 seconds), so this is not accurate.
C. The PR interval is within the normal time limits: The PR interval on the ECG strip spans about 3 to 4 small boxes (0.12–0.16 seconds), which is within the normal range of 0.12 to 0.20 seconds. This indicates normal conduction from the atria through the AV node to the ventricles.
D. Ventricular repolarization is delayed: Delayed ventricular repolarization refers to a prolonged QT interval, not an abnormality in the PR interval. The PR interval evaluates atrial conduction, not ventricular repolarization, so this is an incorrect association.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is E
Explanation
A. contact the prescriber to decrease the rate of the D51/2NS during the blood transfusion: There's no need to alter the rate of maintenance fluids unless there's a fluid volume concern. Additionally, decreasing the rate would not address the need for a dedicated blood transfusion line if another lumen is available.
B. stop the D51/2NS, check the client's vitals & notify the prescriber: Stopping necessary fluids without cause may compromise fluid balance. Unless there's a compatibility issue or no other lumen, stopping the infusion is not the safest or most efficient action.
C. Fluids cannot be given through a CVC: Central venous catheters are routinely used for administering fluids, medications, and blood products, especially in critical care settings.
D. Insert a 22 gauge peripheral IV to administer the transfusion: While blood can be given through a peripheral IV, using an existing central venous catheter is safer and more efficient, especially when multiple lumens are available. Inserting a new IV unnecessarily increases infection and complication risks.
E. transfuse the unit of packed red blood cells through a separate lumen of the CVC: This is the safest and most appropriate action. Triple-lumen CVCs allow for simultaneous infusions through separate channels without mixing. Blood should be transfused through a dedicated lumen to avoid incompatibility or dilution by other fluids.
Correct Answer is B
Explanation
A. Diaphoresis, hypertension: While diaphoresis may occur in response to the discomfort or anxiety caused by a rapid heart rate, hypertension is not a typical feature of atrial flutter. The rapid ventricular response can more often lead to hypotension if cardiac output is compromised.
B. Palpitations, shortness of breath: These are hallmark symptoms of rapid atrial flutter. Palpitations result from the fast, irregular atrial contractions, while shortness of breath may occur due to decreased cardiac output and poor ventricular filling during rapid rates.
C. Systolic murmur, severe anxiety: Atrial flutter is not typically associated with a systolic murmur unless there is a pre-existing valvular condition. Anxiety may be present but is a nonspecific response and not as directly linked to atrial flutter as palpitations and dyspnea.
D. Visual changes, anorexia: These symptoms are not characteristic of atrial flutter. Visual changes may occur with severe hypotension or embolic events, and anorexia may be seen in chronic illness, but neither is directly tied to the acute presentation of atrial flutter.
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