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The nurse is collecting a blood sample for a mixed venous oxygen saturation (SVO2) level from the distal lumen of a pulmonary artery (PA) catheter of a client in cardiogenic shock. Which action should the nurse implement?

A.

Expel the excess air and heparin from the syringe.

B.

Place sample in arterial blood gas syringe.

C.

Obtain a minimum of 1 mL of blood.

D.

Aspirate the blood sample slowly.

Answer and Explanation

The Correct Answer is C

A. Expel the excess air and heparin from the syringe. While removing excess air prevents gas exchange alterations, this is not the priority when obtaining an SVO₂ sample. Excess heparin could dilute the sample, but proper blood volume collection is the first concern.
B. Place sample in arterial blood gas syringe. SVO₂ measures venous oxygen saturation, which is different from arterial blood gases (ABGs). Using an ABG syringe is incorrect because it is heparinized for arterial sampling, and arterial blood does not reflect mixed venous oxygenation.
C. Obtain a minimum of 1 mL of blood. SVO₂ is measured from the distal lumen of a pulmonary artery (PA) catheter to assess oxygen delivery and consumption. At least 1 mL of blood is required for an accurate reading, ensuring sufficient sample volume for laboratory analysis.
D. Aspirate the blood sample slowly. While slow aspiration can help prevent hemolysis, it is not the primary concern when collecting an SVO₂ sample. The priority is obtaining a sufficient volume (≥1 mL) for an accurate measurement.
 


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Related Questions

Correct Answer is D

Explanation

A. Observe vital signs sequences as a way of assessing for Cushing's triad. Cushing’s triad (hypertension with widened pulse pressure, bradycardia, and irregular respirations) is a late sign of increased intracranial pressure (ICP). While monitoring for it is important, early recognition and direct ICP monitoring are more effective in preventing deterioration.
B. Evaluate hourly urinary output. Mannitol is an osmotic diuretic that can cause significant diuresis, requiring close monitoring of urine output to prevent dehydration and electrolyte imbalances. However, assessing ICP is the priority because increased ICP can cause brain herniation, which is life-threatening.
C. Monitor arterial blood pressure. Dopamine is a vasopressor used to maintain cerebral perfusion pressure (CPP), which is crucial in head injury management. While blood pressure monitoring is essential, directly assessing ICP ensures that treatment is effective in preventing secondary brain injury.
D. Assess intracranial pressure following intracranial transducer placement. The highest priority is monitoring ICP immediately after placement to detect dangerous elevations that could lead to herniation. The intraventricular catheter provides real-time pressure readings, guiding interventions like mannitol administration and blood pressure control to optimize cerebral perfusion and prevent worsening neurological damage.

Correct Answer is C

Explanation

A. Elevate the head of the bed and provide a pillow under the client's head. While elevating the head of the bed to 30 degrees can help reduce ICP by promoting venous drainage, placing a pillow under the head may cause neck flexion, which can obstruct venous outflow and worsen intracranial pressure. Instead, the head should be maintained in a neutral midline position without excessive flexion or extension.
B. Suction the endotracheal tube every 15 minutes to reduce choking. Frequent suctioning can increase ICP due to coughing and vagal stimulation. Suctioning should be performed only as needed and using minimized suction duration to prevent sudden rises in intracranial pressure.
C. Intersperse treatments and nursing care with frequent rest periods. Clustering too many nursing interventions together can overstimulate the client and cause spikes in ICP. Providing adequate rest periods between activities such as repositioning, suctioning, and assessments allows intracranial pressure to return to baseline levels, helping to prevent sustained increases.
D. Change positions frequently while providing basic nursing care. Frequent repositioning can cause sudden fluctuations in ICP, especially if movements are abrupt or cause venous obstruction. Turning the client slowly and maintaining the head in a neutral position is recommended to avoid exacerbating intracranial hypertension.

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