A patient has a single central venous pressure (CVP) reading that appears elevated. Is it reliable to use that value alone to establish the patient’s intravascular volume?
6 Hemodynamic Monitoring Techniques Online Quiz Questions
Use this free practice quiz with 20 questions to review 6 Hemodynamic Monitoring Techniques, test your knowledge, and prepare for your next test or exam.
What does an ECG monitor display?
- A
Electrical activity and heart rate
- B
Cardiac output and stroke volume
- C
Peripheral oxygen saturation
- D
Mean arterial pressure
An oscillometric monitor detects cuff-pressure and uses an algorithm to estimate systolic and diastolic pressure and determine MAP.
Which method calculates cardiac output using oxygen consumption and the difference between arterial and mixed venous oxygen content?
An arterial-pressure transducer is positioned below the reference level specified by protocol. What effect should you expect on the displayed pressure?
- A
The pressure reads falsely low.
- B
The pressure reads falsely low only during expiration.
- C
The pressure reads falsely high.
- D
The pressure is unaffected if the waveform is visible.
The relationship used to calculate cardiac output is CO=.
A sudden fall in end-tidal CO₂ can accompany reduced pulmonary blood flow, but that change is specific to reduced pulmonary blood flow.
- A
True
- B
False
At a usual heart rate, estimate MAP for a blood pressure of 120/75 mmHg using MAP≈(SBP+2×DBP)÷3. Enter the value in mmHg.
Pulmonary artery wedge pressure (PAWP) is a direct measurement of left-ventricular end-diastolic pressure.
- A
True
- B
False
A noninvasive monitor provides a cardiac-output estimate that differs from another method during a change in vascular tone. Which interpretation is most appropriate?
- A
They directly measure cardiac output and are unaffected by patient conditions.
- B
They provide indirect estimates that can support assessment and trends, but they are not interchangeable with every other method.
- C
They should replace all invasive measurements whenever a value is available.
- D
They are reliable only when cardiac rhythm is irregular.
A patient develops worsening hypotension and altered mental status while the monitor displays an unexpected value. Select all appropriate actions.
- A
Assess the patient and consider the pattern across repeated measurements.
- B
Assume a single unexpected value is accurate if the monitor is on.
- C
Verify concerning changes promptly and alert the appropriate clinical team.
- D
Follow local escalation procedures and do not delay care while troubleshooting.
- E
Wait for another isolated abnormal value before assessing the patient.
Describe at least two risks of an arterial catheter and at least two precautions that help reduce harm during ongoing line care.
A blood-pressure cuff reading seems higher than expected. Which cuff-sizing problem could have produced a falsely high result?
- A
The cuff is too large for the arm.
- B
The cuff is too small for the arm.
- C
The arm is supported at heart level.
- D
The patient is sitting quietly.
A patient has cool hands and signs of worsening circulation, but the pulse oximeter displays a reassuring SpO₂. What is the most appropriate response?
- A
Accept the reading because pulse oximeters directly measure blood oxygen content.
- B
Increase oxygen solely because the patient’s hands feel cool.
- C
Assess the patient and signal quality, and verify the reading using appropriate clinical methods.
- D
Assume the displayed pulse rate confirms the oxygen-saturation value is accurate.
An arterial pressure transducer is positioned above the reference level specified by protocol. The displayed pressure is lower than expected. Which interpretation and action are appropriate?
- A
Re-level the transducer to the specified reference point; a transducer positioned too high can read falsely low.
- B
Accept the reading because transducer height affects only the waveform shape.
- C
Move the transducer lower than the reference point to correct a falsely low reading.
- D
Zero the system to the patient’s systolic pressure.
An arterial-line system fails its fast-flush test in a way consistent with overdamping. What effect may this have on the displayed pressures?
- A
It may exaggerate systolic pressure and produce ringing.
- B
It may underestimate systolic pressure and overestimate diastolic pressure.
- C
It affects only the displayed heart rate, not arterial pressure.
- D
It proves that the patient’s true pulse pressure is narrow.
A patient’s CVP is elevated while receiving positive-pressure ventilation. Which approach best reflects the limitations of this measurement?
- A
Use the CVP alone to determine the patient’s intravascular volume.
- B
Treat a low CVP as proof that fluid administration will improve cardiac output.
- C
Interpret the CVP in context, including the patient’s condition and factors that affect the measurement.
- D
Use CVP as a direct measurement of left-ventricular end-diastolic pressure.
At a usual heart rate, estimate MAP using MAP≈(SBP+2×DBP)÷3. If SBP is 126 mmHg and DBP is 72 mmHg, what is the estimated MAP?
What is the commonly used reference point that approximates right-atrial level when leveling an arterial pressure transducer, subject to local protocol?
Select all findings that may signal hemodynamic deterioration and warrant prompt clinical assessment.
- A
New altered mental status
- B
A single unchanged blood-pressure reading in a patient with no other changes
- C
Cool or mottled skin with weak pulses
- D
Declining urine output
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