The nurse reviewing the waveform of a patient's central venous pressure line notes two positive waves. Which of the following does this information suggest to the nurse?
1. The c wave is not always visible on the tracing.
2. The line is no longer in the correct position.
3. The wave is not visible during systole.
4. The wave is not visible during diastole.
The c wave is not always visible on the tracing.
Rationale: The normal central venous pressure waveform has three positive waves. The a wave correlates with systole. The c wave reflects retrograde swelling of the tricuspid valve into the right atrium and may not be visible on the tracing. The v wave represents diastole. With the presence of the other waves, the catheter is in the correct position in the patient.
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