The mixed venous oxygen saturation (SvO2) is decreasing in a client who has a severe pneumonia. To determine the possible cause of the decreased SVO2, the nurse assesses the client for
fever.
increase in serum amylase.
an increase in body surface area.
decrease in urinary output.
The Correct Answer is A
A. Fever increases metabolic demand and oxygen consumption, which can reduce SvO₂ by increasing tissue extraction of oxygen.
B. Serum amylase is related to pancreatic function and is not directly associated with SvO₂ changes.
C. Body surface area does not acutely affect SvO₂ levels in this context.
D. Decreased urinary output indicates possible renal hypoperfusion but is a secondary effect and does not directly explain decreased SvO₂.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Failure to sense occurs when the pacemaker does not recognize intrinsic cardiac activity, leading to inappropriate pacing, but pacer spikes are usually present.
B. Failure to pace is indicated when the pacemaker does not deliver electrical impulses, evidenced by the absence of pacer spikes on the rhythm strip. This explains the low heart rate and hypotension.
C. Failure to synchronize occurs with synchronized cardioversion, not in demand pacemakers.
D. Failure to capture occurs when pacer spikes are present but do not result in ventricular depolarization; in this case, pacer spikes are absent.
Correct Answer is D
Explanation
A. The subclavian artery is located near the clavicle and is not assessed using the Allen’s test.
B. The popliteal artery is located behind the knee and is unrelated to arterial line placement in the wrist.
C. While the radial artery is commonly used for arterial line insertion, the Allen’s test assesses the ulnar artery to ensure collateral circulation is adequate if the radial artery is cannulated.
D. The Allen’s test evaluates ulnar artery patency by occluding both the radial and ulnar arteries, having the patient make a fist to blanch the hand, then releasing pressure on the ulnar artery to see if normal color returns. This ensures sufficient blood flow from the ulnar artery before inserting a radial arterial line.
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