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RCIS practice questions

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Question 1Cardiovascular Invasive Procedures and Patient Care

A patient is scheduled for a right heart catheterization. Which access site is most commonly used for this procedure?

  1. Brachial artery
  2. Femoral vein Correct answer.
  3. Femoral artery
  4. Radial artery

Explanation

Right heart catheterization requires venous access to reach the right atrium, right ventricle, and pulmonary artery. The common femoral vein is the most frequently used site because of its large caliber and straight course to the heart. Arterial sites are used for left heart or coronary procedures, not for right heart catheterization.

Question 2Cardiovascular Invasive Procedures and Patient Care

During a femoral arterial puncture, which structure lies directly anterior to the common femoral artery and is at risk of injury if the puncture is too high?

  1. Inguinal ligament Correct answer.
  2. Sartorius muscle
  3. Femoral nerve
  4. Femoral vein

Explanation

The inguinal ligament crosses anterior to the common femoral artery just below the inguinal crease. A puncture placed too high can enter the external iliac artery above the ligament, where compression is difficult and retroperitoneal bleeding may occur. The femoral vein and nerve lie medial and lateral to the artery, respectively, not directly anterior.

Question 3Cardiovascular Invasive Procedures and Patient Care

A patient with a known allergy to shellfish is scheduled for a coronary angiogram. Which pre-procedure consideration is most appropriate?

  1. Premedicate with corticosteroids and antihistamines and use low-osmolar contrast Correct answer.
  2. Cancel the procedure because contrast is contraindicated
  3. Switch to a gadolinium-based contrast agent
  4. Proceed without any precautions because shellfish allergy does not cross-react

Explanation

Shellfish allergy is not a true contraindication to iodinated contrast, but it does identify a patient at higher risk for an allergic-like reaction. Standard practice is premedication with corticosteroids and antihistamines and use of low-osmolar contrast. Gadolinium is not appropriate for coronary angiography.

Question 4Cardiovascular Invasive Procedures and Patient Care

Which parameter is directly measured, rather than calculated, during right heart catheterization?

  1. Cardiac index
  2. Systemic vascular resistance
  3. Cardiac output by Fick method
  4. Pulmonary capillary wedge pressure Correct answer.

Explanation

Pulmonary capillary wedge pressure is obtained by inflating the balloon on a pulmonary artery catheter and recording the pressure transmitted from the left atrium. Cardiac output by Fick, systemic vascular resistance, and cardiac index are all derived from measured values using formulas.

Question 5Cardiovascular Invasive Procedures and Patient Care

A patient's mean right atrial pressure is 12 mm Hg and pulmonary capillary wedge pressure is 8 mm Hg. Which condition is most consistent with these findings?

  1. Mitral stenosis
  2. Right ventricular failure Correct answer.
  3. Left ventricular failure
  4. Constrictive pericarditis with equalization

Explanation

An elevated right atrial pressure with a normal wedge pressure indicates right-sided dysfunction, since the wedge pressure reflects left heart filling. Left ventricular failure would elevate the wedge pressure. Constrictive pericarditis typically produces equalization of diastolic pressures across chambers.

Question 6Cardiovascular Invasive Procedures and Patient Care

During coronary angiography, which vessel is typically engaged first when performing selective left coronary angiography?

  1. Circumflex artery
  2. Left anterior descending artery
  3. Right coronary artery
  4. Left main coronary artery Correct answer.

Explanation

The catheter is seated in the ostium of the left main coronary artery to opacify the entire left coronary system, including the LAD and circumflex. The right coronary artery is engaged separately. The LAD and circumflex are branches visualized after left main injection.

Question 7Cardiovascular Invasive Procedures and Patient Care

Which catheter is most appropriate for measuring pulmonary artery pressures and cardiac output at the bedside?

  1. Judkins left catheter
  2. Pigtail catheter
  3. Swan-Ganz catheter Correct answer.
  4. Amplatz right catheter

Explanation

The Swan-Ganz balloon-tipped, flow-directed catheter is designed for right heart catheterization and measurement of pulmonary artery pressures and cardiac output. Judkins and Amplatz catheters are used for coronary engagement. A pigtail catheter is used for ventriculography and aortic pressure measurement.

Question 8Cardiovascular Invasive Procedures and Patient Care

A patient develops sudden hypotension, tachycardia, and a falling hematocrit shortly after femoral arterial sheath removal. Which complication should be suspected first?

  1. Vasovagal reaction
  2. Retroperitoneal hemorrhage Correct answer.
  3. Contrast-induced nephropathy
  4. Coronary air embolism

Explanation

Hypotension, tachycardia, and a falling hematocrit after femoral access suggest significant bleeding, and retroperitoneal hemorrhage is a classic occult source. Contrast nephropathy develops over days and does not cause acute anemia. Vasovagal reactions typically present with bradycardia rather than tachycardia.

Question 9Cardiovascular Invasive Procedures and Patient Care

Which finding on coronary angiography is characteristic of a hemodynamically significant stenosis?

  1. A 30% narrowing in a distal branch
  2. A myocardial bridge with systolic compression only
  3. A 70% narrowing by visual estimate in a proximal vessel Correct answer.
  4. A 40% narrowing with TIMI 3 flow

Explanation

A stenosis of approximately 70% or greater in a major epicardial vessel is generally considered hemodynamically significant and may warrant intervention. Lesser degrees of narrowing are usually not flow-limiting. A myocardial bridge with systolic compression and TIMI 3 flow do not by themselves indicate significant fixed stenosis.

Question 10Cardiovascular Invasive Procedures and Patient Care

During a left heart catheterization, the catheter is advanced retrograde across the aortic valve into the left ventricle. Which pressure waveform confirms left ventricular placement?

  1. Pressure equal to pulmonary capillary wedge pressure
  2. Pressure with prominent v waves and no systolic rise
  3. Pressure that rises during systole and falls during diastole with a dicrotic notch Correct answer.
  4. Pressure that falls during systole and rises during diastole

Explanation

Left ventricular pressure rises sharply during systole and falls during diastole, while aortic pressure shows a dicrotic notch. The transition from aortic to ventricular waveform confirms crossing the valve. A waveform falling during systole would be characteristic of atrial pressure, not ventricular.

Question 11Cardiovascular Invasive Procedures and Patient Care

Which agent is most commonly used as the anticoagulant during percutaneous coronary intervention?

  1. Clopidogrel
  2. Aspirin
  3. Warfarin
  4. Unfractionated heparin Correct answer.

Explanation

Unfractionated heparin is the standard parenteral anticoagulant used during percutaneous coronary intervention to prevent thrombus formation on catheters and within the coronary artery. Warfarin is an oral agent with a delayed onset and is not used acutely. Clopidogrel and aspirin are antiplatelet agents, not the primary procedural anticoagulant.

Question 12Cardiovascular Invasive Procedures and Patient Care

A patient undergoing PCI develops sudden chest pain and ST-segment elevation in the territory of the treated vessel. Which complication is most likely?

  1. Contrast reaction
  2. Acute stent thrombosis Correct answer.
  3. Coronary perforation
  4. Pericarditis

Explanation

Acute stent thrombosis presents with abrupt ischemic chest pain and ST-segment elevation in the territory of the stented vessel. Coronary perforation typically causes hypotension and tamponade rather than isolated ST elevation. Contrast reactions and pericarditis do not typically produce localized ST elevation in the treated vessel territory.

Question 13Cardiovascular Invasive Procedures and Patient Care

Which patient instruction is most important before an elective cardiac catheterization?

  1. Take nothing by mouth except sips of water with medications for several hours before the procedure Correct answer.
  2. Take a double dose of anticoagulant the morning of the procedure
  3. Perform vigorous exercise the morning of the procedure
  4. Discontinue all antihypertensive medications for 48 hours

Explanation

Elective catheterization generally requires a period of fasting to reduce aspiration risk during sedation. Anticoagulants are typically held or adjusted per protocol, never doubled. Vigorous exercise and discontinuation of antihypertensives are not standard preparatory instructions.

Question 14Cardiovascular Invasive Procedures and Patient Care

During femoral sheath removal after a diagnostic catheterization, which technique is recommended to reduce access-site bleeding?

  1. Remove the sheath while the patient is anticoagulated maximally
  2. Apply manual pressure directly over the arteriotomy while maintaining distal pulses Correct answer.
  3. Apply manual pressure just proximal to the puncture site
  4. Have the patient sit upright immediately

Explanation

Manual compression should be applied directly over the arteriotomy with sufficient force to achieve hemostasis while still allowing distal pulses to be palpable. Compression proximal to the puncture site does not control the arteriotomy. Having the patient sit upright or removing the sheath at peak anticoagulation increases bleeding risk.

Question 15Cardiovascular Invasive Procedures and Patient Care

Which of the following is a recognized risk factor for contrast-induced acute kidney injury in a patient undergoing angiography?

  1. Low contrast volume
  2. Normal ejection fraction
  3. Pre-existing chronic kidney disease Correct answer.
  4. Age under 40 years

Explanation

Pre-existing chronic kidney disease is one of the strongest risk factors for contrast-induced acute kidney injury. Younger age, normal ejection fraction, and lower contrast volume are not risk factors; in fact, minimizing contrast volume reduces risk.

Question 16Cardiovascular Invasive Procedures and Patient Care

A patient's hemodynamic data show a cardiac output of 4.0 L/min and a body surface area of 2.0 m². What is the cardiac index?

  1. 0.5 L/min/m²
  2. 4.0 L/min/m²
  3. 8.0 L/min/m²
  4. 2.0 L/min/m² Correct answer.

Explanation

Cardiac index is calculated by dividing cardiac output by body surface area, which yields 2.0 L/min/m² in this case. Dividing by BSA normalizes flow to body size. The other values result from incorrect arithmetic operations.

Question 17Cardiovascular Invasive Procedures and Patient Care

Which finding on right heart catheterization suggests cardiac tamponade?

  1. Elevated and equalized diastolic pressures with a blunted y descent Correct answer.
  2. Low right atrial pressure with a prominent a wave
  3. Isolated elevation of the pulmonary artery pressure
  4. Elevated and equalized diastolic pressures across chambers with a prominent y descent

Explanation

Cardiac tamponade produces elevated and equalized diastolic pressures with an attenuated or absent y descent because ventricular filling is impaired. Constrictive pericarditis also equalizes pressures but characteristically shows a prominent y descent. Isolated pulmonary hypertension and low right atrial pressure do not describe tamponade.

Question 18Cardiovascular Invasive Procedures and Patient Care

Which vessel is most commonly accessed for coronary angiography when using the radial approach?

  1. Radial artery at the wrist Correct answer.
  2. Radial vein
  3. Femoral vein
  4. Brachial artery at the antecubital fossa

Explanation

The radial approach uses the radial artery at the wrist, which has a lower rate of access-site bleeding and allows early ambulation. The brachial artery is an alternative arterial site but not the radial approach. Femoral and radial veins are venous structures not used for coronary angiography.

Question 19Cardiovascular Invasive Procedures and Patient Care

A patient experiences a sudden vagal reaction during sheath insertion, with bradycardia and hypotension. What is the most appropriate initial management?

  1. Place the patient in a sitting position
  2. Increase the sedation dose
  3. Administer intravenous beta-blocker
  4. Administer intravenous atropine and fluids Correct answer.

Explanation

Vagal reactions cause bradycardia and hypotension and are treated with intravenous fluids and atropine to restore heart rate and blood pressure. Beta-blockers would worsen the bradycardia. Additional sedation and sitting upright would further compromise hemodynamics.

Question 20Cardiovascular Invasive Procedures and Patient Care

Which statement about fractional flow reserve is correct?

  1. It is measured during maximal hyperemia and indicates the hemodynamic significance of a stenosis Correct answer.
  2. It is used to assess right ventricular function
  3. It is measured at rest and reflects only the angiographic appearance
  4. It requires no vasodilator administration

Explanation

Fractional flow reserve is measured during maximal hyperemia, typically induced with adenosine, and provides an index of the hemodynamic significance of a coronary stenosis. It is not a resting measure and does not assess ventricular function. Vasodilator administration is required for maximal hyperemia.

Question 21Cardiovascular Invasive Procedures and Patient Care

A patient is undergoing a diagnostic catheterization. Which pressure waveform is characteristic of the right atrium?

  1. A single systolic peak with a dicrotic notch
  2. a, c, and v waves with a systolic x descent and diastolic y descent Correct answer.
  3. A waveform with no identifiable waves
  4. A steady pressure equal to aortic diastolic pressure

Explanation

The right atrial waveform contains a, c, and v waves with x and y descents corresponding to atrial contraction, tricuspid valve closure, and atrial filling. A dicrotic notch is characteristic of arterial pressure. A steady pressure equal to aortic diastolic pressure does not describe atrial pressure.

Question 22Cardiovascular Invasive Procedures and Patient Care

Which medication is typically administered to reverse the effects of heparin if excessive bleeding occurs during a catheterization?

  1. Vitamin K
  2. Protamine sulfate Correct answer.
  3. Fresh frozen plasma
  4. Adenosine

Explanation

Protamine sulfate binds heparin and neutralizes its anticoagulant effect, making it the standard reversal agent. Vitamin K and fresh frozen plasma reverse warfarin, not heparin. Adenosine is used for hyperemia or to treat certain tachyarrhythmias, not heparin reversal.

Question 23Cardiovascular Invasive Procedures and Patient Care

During a transradial catheterization, which maneuver is commonly used to reduce radial artery spasm?

  1. Administration of intra-arterial vasodilators such as verapamil or nitroglycerin Correct answer.
  2. Rapid inflation of the radial compression band
  3. Vigorous catheter manipulation to pass the spasm quickly
  4. Cold compresses applied to the forearm

Explanation

Intra-arterial vasodilators, such as verapamil or nitroglycerin, are administered to reduce radial artery spasm during transradial procedures. Vigorous manipulation can worsen spasm and cause injury. Cold compresses and compression band inflation do not relieve spasm.

Question 24Cardiovascular Invasive Procedures and Patient Care

A patient's pulmonary artery pressure tracing shows a systolic pressure of 45 mm Hg and a diastolic pressure of 20 mm Hg. Which classification is most appropriate?

  1. Systemic hypotension
  2. Pulmonary hypertension Correct answer.
  3. Normal right ventricular pressure
  4. Normal pulmonary artery pressure

Explanation

A mean pulmonary artery pressure greater than 20 mm Hg defines pulmonary hypertension, and a systolic pressure of 45 mm Hg with a diastolic of 20 mm Hg is elevated. Normal pulmonary artery systolic pressure is generally in the low 20s. These values do not indicate systemic hypotension or normal right ventricular pressure.

Question 25Cardiovascular Invasive Procedures and Patient Care

Which complication is most specifically associated with the use of a large-bore femoral arterial sheath?

  1. Coronary vasospasm
  2. Retroperitoneal hematoma Correct answer.
  3. Contrast-induced nephropathy
  4. Radial artery spasm

Explanation

Large-bore femoral arterial sheaths increase the risk of access-site bleeding, including retroperitoneal hematoma when the puncture is above the inguinal ligament. Contrast nephropathy is related to contrast volume and renal function. Radial artery spasm and coronary vasospasm are unrelated to femoral sheath size.

Question 26Cardiovascular Invasive Procedures and Patient Care

Which parameter is directly measured by a thermodilution catheter to calculate cardiac output?

  1. Change in blood volume over time
  2. Change in blood oxygen saturation over time
  3. Change in blood temperature over time Correct answer.
  4. Change in blood pressure over time

Explanation

Thermodilution cardiac output is based on the principle that the change in blood temperature over time after injecting a known volume of cold fluid is inversely proportional to cardiac output. Blood pressure, oxygen saturation, and blood volume are not used in this calculation.

Question 27Cardiovascular Invasive Procedures and Patient Care

Which access site is associated with the lowest risk of major bleeding complications after cardiac catheterization?

  1. Femoral artery
  2. Brachial artery
  3. Radial artery Correct answer.
  4. Axillary artery

Explanation

The radial artery is smaller and more superficial, allowing easier compression and reducing the risk of major bleeding compared with the femoral, brachial, or axillary approaches. The radial approach has become preferred in many patients for this reason.

Question 28Cardiovascular Invasive Procedures and Patient Care

What is the most appropriate first step when a patient develops a contrast-induced allergic reaction characterized by urticaria and mild wheezing during angiography?

  1. Stop the contrast injection and administer an antihistamine Correct answer.
  2. Proceed with the procedure and monitor closely
  3. Administer intravenous epinephrine
  4. Administer intravenous corticosteroids only

Explanation

For mild allergic reactions such as urticaria and mild wheezing, the contrast administration should be stopped and an antihistamine given. Epinephrine is reserved for severe reactions with hypotension or airway compromise, and corticosteroids alone are not first-line for acute symptoms.

Question 29Cardiovascular Invasive Procedures and Patient Care

Which patient instruction is essential before a scheduled cardiac catheterization?

  1. Arrange for someone to drive you home Correct answer.
  2. Avoid drinking fluids after midnight
  3. Take all usual medications including anticoagulants
  4. Perform vigorous exercise the morning of the procedure

Explanation

Patients are typically sedated and may receive medications that impair driving, so they must arrange for a responsible adult to drive them home. Fluid restrictions and medication adjustments are individualized, and vigorous exercise is not recommended before the procedure.

Question 30Cardiovascular Invasive Procedures and Patient Care

During a right heart catheterization, the catheter is advanced from the right atrium into the right ventricle. Which pressure waveform change indicates correct placement?

  1. A decrease in systolic pressure and an increase in diastolic pressure Correct answer.
  2. A loss of the dicrotic notch
  3. A sudden increase in systolic pressure and a decrease in diastolic pressure
  4. The appearance of a prominent v wave

Explanation

The right ventricular waveform has a higher systolic pressure and lower diastolic pressure compared with the right atrium, so the transition shows a systolic increase and diastolic decrease. A prominent v wave is characteristic of the right atrium, and the dicrotic notch is seen in arterial waveforms.

Question 31Cardiovascular Invasive Procedures and Patient Care

A patient with a known allergy to iodinated contrast requires an urgent angiogram. Which premedication regimen is most appropriate to reduce the risk of an allergic reaction?

  1. Oral prednisone 24 hours before and diphenhydramine 1 hour before Correct answer.
  2. Intravenous heparin 1 hour before
  3. No premedication is needed
  4. Oral aspirin 325 mg 2 hours before

Explanation

For patients with prior contrast allergy, premedication with corticosteroids (e.g., prednisone) and an antihistamine (e.g., diphenhydramine) is recommended, typically starting 13, 7, and 1 hour before contrast or as a single dose 24 hours prior. Heparin and aspirin do not prevent allergic reactions.

Question 32Cardiovascular Invasive Procedures and Patient Care

A patient's hemodynamic data show a pulmonary artery systolic pressure of 45 mm Hg, diastolic pressure of 20 mm Hg, and a right atrial pressure of 10 mm Hg. What is the calculated mean pulmonary artery pressure?

  1. 28 mm Hg Correct answer.
  2. 32 mm Hg
  3. 30 mm Hg
  4. 25 mm Hg

Explanation

Mean pulmonary artery pressure is calculated as (systolic + 2 × diastolic) / 3. Using the values: (45 + 2 × 20) / 3 = (45 + 40) / 3 = 85 / 3 ≈ 28 mm Hg. The right atrial pressure is not used in this calculation.

Question 33Cardiovascular Invasive Procedures and Patient Care

Which finding on coronary angiography is most consistent with a thrombus in the infarct-related artery?

  1. A coronary artery fistula
  2. A filling defect with contrast staining Correct answer.
  3. A smooth, tapered narrowing
  4. A focal calcified plaque without stenosis

Explanation

Thrombus appears as a filling defect or intraluminal haziness with contrast staining, often in the setting of acute coronary syndrome. Smooth tapered narrowing suggests a stable plaque, calcified plaque without stenosis is not thrombotic, and a fistula is an abnormal connection.

Question 34Cardiovascular Invasive Procedures and Patient Care

During a percutaneous coronary intervention, the patient suddenly develops severe chest pain and ST-segment elevation in the treated territory. What is the most likely cause?

  1. Contrast-induced nephropathy
  2. Vasovagal reaction
  3. Coronary perforation
  4. Acute stent thrombosis Correct answer.

Explanation

Acute stent thrombosis presents with abrupt chest pain and ST-segment elevation in the territory of the treated vessel due to occlusion. Coronary perforation typically causes hypotension and tamponade, contrast nephropathy is delayed, and vasovagal reaction causes bradycardia and hypotension without focal ST changes.

Question 35Cardiovascular Invasive Procedures and Patient Care

Which measure is most effective in reducing radiation exposure to the operator during cardiac catheterization?

  1. Removing the lead apron for comfort
  2. Increasing the use of fluoroscopy time
  3. Using pulsed fluoroscopy and collimation Correct answer.
  4. Standing closer to the radiation source

Explanation

Pulsed fluoroscopy reduces the number of frames and collimation narrows the beam, both decreasing scatter radiation. Increasing fluoroscopy time, standing closer to the source, and removing protective shielding all increase operator exposure.

Question 36Cardiovascular Invasive Procedures and Patient Care

A patient with severe aortic stenosis is undergoing cardiac catheterization. Which finding on left heart catheterization is most characteristic?

  1. A systolic pressure gradient between the left ventricle and aorta Correct answer.
  2. Equal systolic pressures in the left ventricle and aorta
  3. A diastolic pressure gradient between the aorta and left ventricle
  4. A mean gradient of 5 mm Hg

Explanation

Severe aortic stenosis produces a systolic pressure gradient across the aortic valve due to obstruction to outflow. Diastolic gradients are seen in aortic regurgitation, equal pressures indicate no stenosis, and a mean gradient of 5 mm Hg is not severe.

Question 37Cardiovascular Invasive Procedures and Patient Care

Which medication is most appropriate for the initial management of a patient who develops hypotension and bradycardia due to a vasovagal reaction during catheterization?

  1. Adenosine
  2. Nitroglycerin
  3. Atropine Correct answer.
  4. Amiodarone

Explanation

Vasovagal reactions cause bradycardia and hypotension, and atropine is the first-line treatment to increase heart rate and improve blood pressure. Adenosine and amiodarone are antiarrhythmics, and nitroglycerin would worsen hypotension.

Question 38Cardiovascular Invasive Procedures and Patient Care

During a transradial catheterization, which technique is recommended to reduce the risk of radial artery spasm?

  1. Use of a larger sheath size
  2. Rapid catheter advancement without a guidewire
  3. Prolonged compression of the radial artery
  4. Administration of intra-arterial nitroglycerin and verapamil Correct answer.

Explanation

Intra-arterial vasodilators such as nitroglycerin and verapamil relax the radial artery and reduce spasm. Rapid advancement without a guidewire, larger sheaths, and prolonged compression can increase spasm and injury.

Question 39Cardiovascular Invasive Procedures and Patient Care

A patient with a suspected coronary artery fistula is undergoing angiography. Which finding is most consistent with this diagnosis?

  1. A focal stenosis in the left anterior descending artery
  2. A coronary aneurysm without flow
  3. A myocardial bridge with systolic compression
  4. A direct connection between a coronary artery and a cardiac chamber Correct answer.

Explanation

A coronary artery fistula is an abnormal communication between a coronary artery and a cardiac chamber or other vessel, often seen as contrast filling the chamber. Focal stenosis, myocardial bridge, and aneurysm without flow do not define a fistula.

Question 40Cardiovascular Invasive Procedures and Patient Care

Which hemodynamic parameter is most useful for distinguishing constrictive pericarditis from restrictive cardiomyopathy during right heart catheterization?

  1. Cardiac output
  2. Right ventricular end-diastolic pressure
  3. Pulmonary artery wedge pressure
  4. Concordance of ventricular pressures during respiration Correct answer.

Explanation

In constrictive pericarditis, ventricular pressures show discordance during respiration (ventricular interdependence), whereas in restrictive cardiomyopathy they change concordantly. End-diastolic pressure, wedge pressure, and cardiac output can be abnormal in both conditions and are less specific.

Question 41Hemodynamic Monitoring and Interpretation

A pulmonary artery catheter thermistor measures a change in blood temperature to determine which parameter?

  1. Systemic vascular resistance
  2. Pulmonary capillary wedge pressure
  3. Cardiac output by thermodilution Correct answer.
  4. Mixed venous oxygen saturation

Explanation

Thermodilution cardiac output is calculated from the temperature-time curve recorded after injecting a known volume of cold or room-temperature fluid. The area under the curve is inversely related to flow. Oxygen saturation and wedge pressure require separate sensors or balloon inflation.

Question 42Hemodynamic Monitoring and Interpretation

The Fick principle determines cardiac output from which relationship?

  1. Oxygen consumption divided by the arteriovenous oxygen content difference Correct answer.
  2. Mean arterial pressure divided by heart rate
  3. Pulmonary artery pressure minus wedge pressure
  4. Stroke volume multiplied by body surface area

Explanation

The Fick principle states that oxygen uptake equals cardiac output times the arteriovenous oxygen content difference, so output equals consumption divided by that difference. Pressure and heart rate do not enter the equation directly.

Question 43Hemodynamic Monitoring and Interpretation

Using the Fick method, a patient consumes 250 mL/min of oxygen, arterial content is 20 mL/dL, and mixed venous content is 15 mL/dL. What is the cardiac output?

  1. 50 L/min
  2. 2.5 L/min
  3. 5 L/min Correct answer.
  4. 10 L/min

Explanation

The arteriovenous difference is 5 mL/dL, or 50 mL per liter of blood. Dividing 250 mL/min by 50 mL/L gives 5 L/min.

Question 44Hemodynamic Monitoring and Interpretation

Which set of findings is most consistent with cardiogenic shock?

  1. High cardiac index, high wedge pressure, low systemic vascular resistance
  2. Low cardiac index, low wedge pressure, high systemic vascular resistance
  3. Low cardiac index, high wedge pressure, high systemic vascular resistance Correct answer.
  4. High cardiac index, low wedge pressure, low systemic vascular resistance

Explanation

In cardiogenic shock the pump fails, so index falls and filling pressures rise; compensatory vasoconstriction raises systemic vascular resistance. Low filling pressures would instead suggest hypovolemia. High output with low resistance suggests a distributive process.

Question 45Hemodynamic Monitoring and Interpretation

A pulmonary artery occlusion (wedge) pressure best estimates which chamber's filling pressure?

  1. Right ventricular end-diastolic pressure
  2. Right atrial pressure
  3. Aortic diastolic pressure
  4. Left atrial pressure Correct answer.

Explanation

With the balloon inflated, the column of blood transmits left atrial pressure back to the catheter tip, so the wedge pressure estimates left atrial pressure and, indirectly, left ventricular end-diastolic pressure. Right-sided pressures are read from the proximal port.

Question 46Hemodynamic Monitoring and Interpretation

Which condition most likely produces a falsely elevated pulmonary artery wedge pressure?

  1. Balloon deflation during measurement
  2. Hypovolemia
  3. Placement of the transducer at the phlebostatic axis
  4. Positive end-expiratory pressure of 15 cm H2O Correct answer.

Explanation

High intrathoracic pressure from PEEP is transmitted to the pulmonary vasculature and can raise the measured wedge pressure independent of left heart filling. Transducer leveling at the phlebostatic axis and balloon inflation are required for accuracy.

Question 47Hemodynamic Monitoring and Interpretation

The phlebostatic axis is located at which anatomic landmark?

  1. Fifth intercostal space at the anterior axillary line
  2. Midclavicular line at the third intercostal space
  3. Fourth intercostal space at the midaxillary line Correct answer.
  4. Sternal angle at the second intercostal space

Explanation

The phlebostatic axis is the intersection of the fourth intercostal space and the midaxillary line, approximating the level of the right atrium. Transducers are zeroed and leveled at this reference.

Question 48Hemodynamic Monitoring and Interpretation

A pressure trace shows a dicrotic notch followed by a gradual decline, with systolic pressure around 25 mm Hg. Which waveform is this?

  1. Right ventricular pressure
  2. Right atrial pressure
  3. Pulmonary artery pressure Correct answer.
  4. Pulmonary artery wedge pressure

Explanation

The pulmonary artery tracing has a systolic upstroke, a dicrotic notch from pulmonary valve closure, and a diastolic runoff. Right atrial pressure is a low-amplitude waveform with a, c, and v waves.

Question 49Hemodynamic Monitoring and Interpretation

During catheter advancement, which waveform confirms entry into the right ventricle?

  1. Pressure of 120/80 mm Hg with a dicrotic notch
  2. Pressure falling to a mean of 5 mm Hg with a, c, and v waves
  3. Pressure of 10/5 mm Hg with no respiratory variation
  4. Pressure rising to roughly 25/0 mm Hg with a sharp systolic upstroke Correct answer.

Explanation

Right ventricular pressure has a systolic peak similar to pulmonary artery systolic but a diastolic trough near zero, producing the characteristic wide pulse pressure. The right atrial waveform is low and pulsatile, while systemic arterial pressure is much higher.

Question 50Hemodynamic Monitoring and Interpretation

Which hemodynamic finding distinguishes cardiac tamponade from constrictive pericarditis?

  1. Elevated central venous pressure with Kussmaul sign
  2. Reduced cardiac output with a narrow pulse pressure
  3. Elevated wedge pressure with a prominent y descent
  4. Equalization of diastolic pressures across chambers with blunted y descent Correct answer.

Explanation

Tamponade produces diastolic pressure equalization and an attenuated y descent because ventricular filling is impaired throughout diastole. Constrictive pericarditis classically shows a prominent y descent and a steep early filling wave.