Identify the telemetry strip below.
Third-degree AV block.
First-degree AV block.
Second-degree AV block Mobitz type 1 (Wenckebach).
Second-degree AV block Mobitz type 2.
The Correct Answer is C
Choice A rationale
Third-degree AV block, also known as complete heart block, is characterized by a complete dissociation between atrial and ventricular activity, meaning P waves and QRS complexes occur independently without any consistent relationship. This rhythm does not exhibit such complete dissociation.
Choice B rationale
First-degree AV block is indicated by a prolonged PR interval (greater than 0.20 seconds) with every P wave followed by a QRS complex. The rhythm strip shows a progressive lengthening of the PR interval before a dropped QRS, which is not characteristic of first-degree block.
Choice C rationale
Second-degree AV block Mobitz type 1 (Wenckebach) is characterized by a progressive lengthening of the PR interval over several beats, eventually culminating in a P wave that is not followed by a QRS complex (a dropped beat), after which the cycle repeats. This is exactly what is shown in the telemetry strip.
Choice D rationale
Second-degree AV block Mobitz type 2 is characterized by a constant PR interval for conducted beats, but with intermittent dropped QRS complexes without prior PR interval prolongation. This differs from the progressive PR lengthening seen in the provided rhythm strip.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Pulse oximetry measures the oxygen saturation of hemoglobin in peripheral blood, which is an indirect and less accurate measure of oxygen concentration in the blood, especially in patients with respiratory compromise or poor peripheral perfusion. It is non-invasive and provides an estimate (normal range 95-100%).
Choice B rationale
A capillary blood sample, typically obtained from a fingertip, provides information on blood glucose or lactate, but it is not the most accurate method for assessing arterial oxygen concentration due to its mixed venous and arterial components and potential for air exposure.
Choice C rationale
Assessment of the patient's nail beds provides a visual, qualitative assessment of peripheral perfusion and oxygenation (e.g., cyanosis), but it is subjective and not a precise or scientific measurement of the actual oxygen concentration in the blood.
Choice D rationale
An arterial blood gas (ABG) study directly measures the partial pressure of oxygen in arterial blood ($PaO_2$), along with carbon dioxide, pH, and bicarbonate. This provides the most accurate and precise assessment of oxygenation status and acid-base balance in the patient's blood. Normal $PaO_2$ is 80-100 mmHg.
Correct Answer is ["100"]
Explanation
Step 1: Calculate mL per minute. 100 mL ÷ 60 min = 1.666. mL/min.
Step 2: Multiply mL per minute by the drop factor. 1.666. mL/min × 60 gtt/mL = 100 gtt/min. The nurse should set the IV flow rate to deliver 100 gtt/min.
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