Critical Care Nursing & Hemodynamic
Monitoring Advanced Prep: Master
Hemodynamic Assessment & Clinical
Management Practice Questions & Detailed
Explanations
Subject: Critical Care Nursing - Advanced Hemodynamic Monitoring and
Hemodynamic Support
Question 1: A patient in the ICU with cardiogenic shock is monitored via a pulmonary artery
catheter. The hemodynamic profile reveals a Cardiac Index (CI) of 1.8 L/min/m², a Pulmonary
Artery Wedge Pressure (PAWP) of 24 mmHg, and a Systemic Vascular Resistance Index (SVRI)
of 2800 dynes·sec/cm⁵/m². Which intervention is most appropriate to initiate based on these
findings?
A) Rapid isotonic fluid bolus of 500 mL.
B) Initiation of a dobutamine infusion.
C) Administration of a potent vasoconstrictor like norepinephrine.
D) Immediate synchronized cardioversion.
Correct Answer: B) Initiation of a dobutamine infusion.
Explanation: The patient’s profile demonstrates low cardiac output (CI < 2.2), elevated left-
sided preload (PAWP > 18), and high afterload (SVRI > 2400), characteristic of cardiogenic
shock. Dobutamine, an inotrope, increases cardiac contractility, helping to unload the heart by
improving forward flow and reducing PAWP, unlike fluids (which worsen congestion) or
vasoconstrictors (which increase afterload and myocardial oxygen demand).
Question 2: While calibrating a transducer for an arterial line, the nurse performs a "square wave
test" to assess dynamic response. The result shows three oscillations after the flush before
returning to the baseline. What does this indicate?
A) The system is critically damped.
B) The system is optimally damped.
C) The system is underdamped.
D) The system has a mechanical air leak.
,Correct Answer: C) The system is underdamped.
Explanation: A square wave test should ideally show one to two oscillations before returning to
baseline (optimally damped). Three or more oscillations indicate an underdamped system, which
often causes an artificial exaggeration of the systolic blood pressure and potential measurement
errors. Critical damping would show no oscillations.
Question 3: A patient with septic shock is receiving norepinephrine. Despite reaching a Mean
Arterial Pressure (MAP) of 68 mmHg, the patient's ScvO2 (central venous oxygen saturation)
remains 52%. What is the most plausible physiological explanation for this value?
A) Inadequate oxygen delivery (DO2) relative to tissue demand.
B) High oxygen extraction ratio due to improved microvascular perfusion.
C) Early signs of hyperdynamic circulatory state.
D) Excessive sedative use reducing metabolic rate.
Correct Answer: A) Inadequate oxygen delivery (DO2) relative to tissue demand.
Explanation: An ScvO2 < 65-70% in a septic patient suggests that the tissues are extracting a
higher-than-normal percentage of oxygen from the blood due to either decreased oxygen
delivery (low hemoglobin, low cardiac output) or increased oxygen consumption. Given the MAP
is acceptable, this points to a demand-supply mismatch requiring further optimization of CO or
hemoglobin.
Question 4: Which of the following hemodynamic changes is most characteristic of early
hypovolemic shock?
A) Increased CVP, increased PAWP, increased SVRI.
B) Decreased CVP, decreased PAWP, increased SVRI.
C) Decreased CVP, decreased PAWP, decreased SVRI.
D) Increased CVP, decreased PAWP, normal SVRI.
Correct Answer: B) Decreased CVP, decreased PAWP, increased SVRI.
Explanation: Hypovolemic shock results in a decrease in total intravascular volume, leading to
reduced venous return (low CVP) and reduced left ventricular filling pressures (low PAWP). The
body compensates via the sympathetic nervous system, resulting in peripheral vasoconstriction,
which manifests as increased SVRI.
,Question 5: A patient has a Pulmonary Artery (PA) catheter in place. When inflating the balloon
to obtain a PAWP reading, you note the waveform does not change from the PA pressure
waveform despite the balloon being fully inflated. What is the most likely cause?
A) The balloon is in a distal branch, causing an "over-wedged" tracing.
B) The catheter has migrated proximally; the balloon is not in a position to occlude flow.
C) The transducer is not zeroed correctly.
D) The patient has developed pulmonary hypertension.
Correct Answer: B) The catheter has migrated proximally; the balloon is not in a position to
occlude flow.
Explanation: Failure of the waveform to change to a "wedge" tracing upon inflation indicates
the balloon is not properly positioned in a smaller branch of the pulmonary artery. This is a
common sign of proximal migration. Over-wedging usually presents with an upward drift of the
tracing or high-pressure spikes, not a lack of waveform change.
Question 6: Which parameter provides the most accurate reflection of the left ventricular end-
diastolic volume (LVEDV)?
A) Central Venous Pressure (CVP).
B) Pulmonary Artery Wedge Pressure (PAWP).
C) Left Ventricular End-Diastolic Pressure (LVEDP).
D) Global End-Diastolic Volume (GEDV).
Correct Answer: D) Global End-Diastolic Volume (GEDV).
Explanation: While PAWP and LVEDP are used as surrogates for preload, they are pressure
measurements, not volume measurements, and can be influenced by ventricular compliance.
GEDV, measured via transpulmonary thermodilution, is a direct volume measurement and is
more reliable in conditions with altered ventricular compliance.
Question 7: A patient with chronic obstructive pulmonary disease (COPD) develops an acute
exacerbation. A PA catheter is inserted. Which finding would you expect, specifically related to
the patient’s underlying lung pathology?
A) Decreased right atrial pressure.
B) Elevated pulmonary artery systolic pressure.
, C) Decreased systemic vascular resistance.
D) Normal pulmonary vascular resistance.
Correct Answer: B) Elevated pulmonary artery systolic pressure.
Explanation: Chronic hypoxia in COPD leads to chronic pulmonary vasoconstriction, resulting
in pulmonary hypertension and elevated PA pressures (cor pulmonale). This puts a significant
strain on the right ventricle.
Question 8: In the context of hemodynamic monitoring, what is the significance of the "dicrotic
notch" on an arterial pressure waveform?
A) It represents the onset of ventricular systole.
B) It marks the closure of the aortic valve.
C) It indicates the beginning of diastole.
D) Both B and C are correct.
Correct Answer: D) Both B and C are correct.
Explanation: The dicrotic notch signifies the closure of the aortic valve, which effectively
separates systole from diastole. Therefore, it marks the exact end of ventricular ejection and the
start of the diastolic phase.
Question 9: Which patient population is at the highest risk for inaccurate PAWP readings due to
altered thoracic pressures?
A) Patients on controlled mechanical ventilation with high PEEP.
B) Patients with stable sinus rhythm.
C) Patients with an open pericardium following cardiac surgery.
D) Patients with localized pneumonia.
Correct Answer: A) Patients on controlled mechanical ventilation with high PEEP.
Explanation: Positive End-Expiratory Pressure (PEEP) increases intrathoracic pressure, which
is transmitted to the pulmonary vasculature. This causes an artificial elevation of the PAWP,
necessitating careful clinical interpretation and "off-vent" measurements if the protocol allows.
Monitoring Advanced Prep: Master
Hemodynamic Assessment & Clinical
Management Practice Questions & Detailed
Explanations
Subject: Critical Care Nursing - Advanced Hemodynamic Monitoring and
Hemodynamic Support
Question 1: A patient in the ICU with cardiogenic shock is monitored via a pulmonary artery
catheter. The hemodynamic profile reveals a Cardiac Index (CI) of 1.8 L/min/m², a Pulmonary
Artery Wedge Pressure (PAWP) of 24 mmHg, and a Systemic Vascular Resistance Index (SVRI)
of 2800 dynes·sec/cm⁵/m². Which intervention is most appropriate to initiate based on these
findings?
A) Rapid isotonic fluid bolus of 500 mL.
B) Initiation of a dobutamine infusion.
C) Administration of a potent vasoconstrictor like norepinephrine.
D) Immediate synchronized cardioversion.
Correct Answer: B) Initiation of a dobutamine infusion.
Explanation: The patient’s profile demonstrates low cardiac output (CI < 2.2), elevated left-
sided preload (PAWP > 18), and high afterload (SVRI > 2400), characteristic of cardiogenic
shock. Dobutamine, an inotrope, increases cardiac contractility, helping to unload the heart by
improving forward flow and reducing PAWP, unlike fluids (which worsen congestion) or
vasoconstrictors (which increase afterload and myocardial oxygen demand).
Question 2: While calibrating a transducer for an arterial line, the nurse performs a "square wave
test" to assess dynamic response. The result shows three oscillations after the flush before
returning to the baseline. What does this indicate?
A) The system is critically damped.
B) The system is optimally damped.
C) The system is underdamped.
D) The system has a mechanical air leak.
,Correct Answer: C) The system is underdamped.
Explanation: A square wave test should ideally show one to two oscillations before returning to
baseline (optimally damped). Three or more oscillations indicate an underdamped system, which
often causes an artificial exaggeration of the systolic blood pressure and potential measurement
errors. Critical damping would show no oscillations.
Question 3: A patient with septic shock is receiving norepinephrine. Despite reaching a Mean
Arterial Pressure (MAP) of 68 mmHg, the patient's ScvO2 (central venous oxygen saturation)
remains 52%. What is the most plausible physiological explanation for this value?
A) Inadequate oxygen delivery (DO2) relative to tissue demand.
B) High oxygen extraction ratio due to improved microvascular perfusion.
C) Early signs of hyperdynamic circulatory state.
D) Excessive sedative use reducing metabolic rate.
Correct Answer: A) Inadequate oxygen delivery (DO2) relative to tissue demand.
Explanation: An ScvO2 < 65-70% in a septic patient suggests that the tissues are extracting a
higher-than-normal percentage of oxygen from the blood due to either decreased oxygen
delivery (low hemoglobin, low cardiac output) or increased oxygen consumption. Given the MAP
is acceptable, this points to a demand-supply mismatch requiring further optimization of CO or
hemoglobin.
Question 4: Which of the following hemodynamic changes is most characteristic of early
hypovolemic shock?
A) Increased CVP, increased PAWP, increased SVRI.
B) Decreased CVP, decreased PAWP, increased SVRI.
C) Decreased CVP, decreased PAWP, decreased SVRI.
D) Increased CVP, decreased PAWP, normal SVRI.
Correct Answer: B) Decreased CVP, decreased PAWP, increased SVRI.
Explanation: Hypovolemic shock results in a decrease in total intravascular volume, leading to
reduced venous return (low CVP) and reduced left ventricular filling pressures (low PAWP). The
body compensates via the sympathetic nervous system, resulting in peripheral vasoconstriction,
which manifests as increased SVRI.
,Question 5: A patient has a Pulmonary Artery (PA) catheter in place. When inflating the balloon
to obtain a PAWP reading, you note the waveform does not change from the PA pressure
waveform despite the balloon being fully inflated. What is the most likely cause?
A) The balloon is in a distal branch, causing an "over-wedged" tracing.
B) The catheter has migrated proximally; the balloon is not in a position to occlude flow.
C) The transducer is not zeroed correctly.
D) The patient has developed pulmonary hypertension.
Correct Answer: B) The catheter has migrated proximally; the balloon is not in a position to
occlude flow.
Explanation: Failure of the waveform to change to a "wedge" tracing upon inflation indicates
the balloon is not properly positioned in a smaller branch of the pulmonary artery. This is a
common sign of proximal migration. Over-wedging usually presents with an upward drift of the
tracing or high-pressure spikes, not a lack of waveform change.
Question 6: Which parameter provides the most accurate reflection of the left ventricular end-
diastolic volume (LVEDV)?
A) Central Venous Pressure (CVP).
B) Pulmonary Artery Wedge Pressure (PAWP).
C) Left Ventricular End-Diastolic Pressure (LVEDP).
D) Global End-Diastolic Volume (GEDV).
Correct Answer: D) Global End-Diastolic Volume (GEDV).
Explanation: While PAWP and LVEDP are used as surrogates for preload, they are pressure
measurements, not volume measurements, and can be influenced by ventricular compliance.
GEDV, measured via transpulmonary thermodilution, is a direct volume measurement and is
more reliable in conditions with altered ventricular compliance.
Question 7: A patient with chronic obstructive pulmonary disease (COPD) develops an acute
exacerbation. A PA catheter is inserted. Which finding would you expect, specifically related to
the patient’s underlying lung pathology?
A) Decreased right atrial pressure.
B) Elevated pulmonary artery systolic pressure.
, C) Decreased systemic vascular resistance.
D) Normal pulmonary vascular resistance.
Correct Answer: B) Elevated pulmonary artery systolic pressure.
Explanation: Chronic hypoxia in COPD leads to chronic pulmonary vasoconstriction, resulting
in pulmonary hypertension and elevated PA pressures (cor pulmonale). This puts a significant
strain on the right ventricle.
Question 8: In the context of hemodynamic monitoring, what is the significance of the "dicrotic
notch" on an arterial pressure waveform?
A) It represents the onset of ventricular systole.
B) It marks the closure of the aortic valve.
C) It indicates the beginning of diastole.
D) Both B and C are correct.
Correct Answer: D) Both B and C are correct.
Explanation: The dicrotic notch signifies the closure of the aortic valve, which effectively
separates systole from diastole. Therefore, it marks the exact end of ventricular ejection and the
start of the diastolic phase.
Question 9: Which patient population is at the highest risk for inaccurate PAWP readings due to
altered thoracic pressures?
A) Patients on controlled mechanical ventilation with high PEEP.
B) Patients with stable sinus rhythm.
C) Patients with an open pericardium following cardiac surgery.
D) Patients with localized pneumonia.
Correct Answer: A) Patients on controlled mechanical ventilation with high PEEP.
Explanation: Positive End-Expiratory Pressure (PEEP) increases intrathoracic pressure, which
is transmitted to the pulmonary vasculature. This causes an artificial elevation of the PAWP,
necessitating careful clinical interpretation and "off-vent" measurements if the protocol allows.
