,BKAT Pulmonary Artery Catheters 150 QUESTION s with Answers and
Rationales PRACTICE EXAM REVIEWS WITH COMPLETE ACTUAL EXAM
QUESTION S AND CORRECT VERIFIED ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!)
QUESTION 1: What anatomical landmark defines the phlebostatic axis,
which must be aligned with the air-fluid interface of the transducer for
accurate hemodynamic pressure measurement?
• A) Fourth intercostal space at the midaxillary line
• B) Second intercostal space at the midclavicular line
• C) Fifth intercostal space at the left sternal border
• D) Third intercostal space at the anterior axillary line
Correct Answer: A
Rationale: The phlebostatic axis corresponds to the level of the right
atrium (4th intercostal space, midaxillary line), serving as the standard
reference point for zeroing hemodynamic transducers.
QUESTION 2: Why is it essential to re-zero the pressure transducer
whenever the patient's head of bed or body position is significantly
altered?
• A) To compensate for changes in hydrostatic pressure and
maintain accurate baseline referencing relative to the phlebostatic
axis.
• B) To recalibrate the monitor's electrical screen brightness and
contrast.
, • C) To prevent blood from clotting inside the intravenous flush
tubing.
• D) To measure exact systemic arterial blood oxygen levels.
Correct Answer: A
Rationale: Changing patient position alters the vertical height of the
heart relative to the transducer, introducing hydrostatic error that is
corrected by re-zeroing at the phlebostatic axis.
QUESTION 3: As a pulmonary artery catheter is advanced from the right
atrium into the right ventricle, what characteristic change is observed
on the pressure monitor waveform?
• A) A sharp increase in systolic pressure (up to 25 mmHg) dropping
down to a near-zero diastolic baseline (0-5 mmHg).
• B) A low, flat mean pressure waveform with small a, c, and v
waves.
• C) A high diastolic baseline with a prominent dicrotic notch.
• D) A continuous wedge pressure trace with zero pulsations.
Correct Answer: A
Rationale: Right ventricular pressure waveforms show a tall systolic
peak followed by a drop to near-zero during diastole, differentiating
them from atrial and pulmonary artery traces.
QUESTION 4: What physiological parameter does the Pulmonary Artery
Wedge Pressure (PAWP) primarily estimate when measured correctly?
• A) Left ventricular end-diastolic pressure (LVEDP) and left atrial
filling pressure (left heart preload).
, • B) Right ventricular contractility and stroke volume.
• C) Total systemic vascular resistance.
• D) Pulmonary capillary membrane permeability.
Correct Answer: A
Rationale: When the balloon is inflated, blood flow past the tip stops,
creating a static column of blood that reflects left atrial pressure and
left ventricular end-diastolic pressure.
QUESTION 5: What life-threatening dysrhythmia is most commonly
provoked during the insertion or accidental migration of a pulmonary
artery catheter into the right ventricle?
• A) Premature Ventricular Contractions (PVCs) or Ventricular
Tachycardia (VT) / Ventricular Fibrillation (VF).
• B) Symptomatic sinus bradycardia.
• C) Atrial fibrillation with rapid ventricular response.
• D) Third-degree heart block.
Correct Answer: A
Rationale: Physical irritation of the right ventricular endocardium by the
catheter tip commonly precipitates ventricular ectopy, PVCs, or
ventricular tachycardia.
QUESTION 6: What is the maximum recommended duration for
keeping a pulmonary artery catheter balloon inflated when obtaining a
wedge pressure measurement?
• A) No longer than 10 to 15 seconds (or 1 to 2 respiratory cycles) to
prevent distal ischemia and pulmonary infarction.
Rationales PRACTICE EXAM REVIEWS WITH COMPLETE ACTUAL EXAM
QUESTION S AND CORRECT VERIFIED ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!)
QUESTION 1: What anatomical landmark defines the phlebostatic axis,
which must be aligned with the air-fluid interface of the transducer for
accurate hemodynamic pressure measurement?
• A) Fourth intercostal space at the midaxillary line
• B) Second intercostal space at the midclavicular line
• C) Fifth intercostal space at the left sternal border
• D) Third intercostal space at the anterior axillary line
Correct Answer: A
Rationale: The phlebostatic axis corresponds to the level of the right
atrium (4th intercostal space, midaxillary line), serving as the standard
reference point for zeroing hemodynamic transducers.
QUESTION 2: Why is it essential to re-zero the pressure transducer
whenever the patient's head of bed or body position is significantly
altered?
• A) To compensate for changes in hydrostatic pressure and
maintain accurate baseline referencing relative to the phlebostatic
axis.
• B) To recalibrate the monitor's electrical screen brightness and
contrast.
, • C) To prevent blood from clotting inside the intravenous flush
tubing.
• D) To measure exact systemic arterial blood oxygen levels.
Correct Answer: A
Rationale: Changing patient position alters the vertical height of the
heart relative to the transducer, introducing hydrostatic error that is
corrected by re-zeroing at the phlebostatic axis.
QUESTION 3: As a pulmonary artery catheter is advanced from the right
atrium into the right ventricle, what characteristic change is observed
on the pressure monitor waveform?
• A) A sharp increase in systolic pressure (up to 25 mmHg) dropping
down to a near-zero diastolic baseline (0-5 mmHg).
• B) A low, flat mean pressure waveform with small a, c, and v
waves.
• C) A high diastolic baseline with a prominent dicrotic notch.
• D) A continuous wedge pressure trace with zero pulsations.
Correct Answer: A
Rationale: Right ventricular pressure waveforms show a tall systolic
peak followed by a drop to near-zero during diastole, differentiating
them from atrial and pulmonary artery traces.
QUESTION 4: What physiological parameter does the Pulmonary Artery
Wedge Pressure (PAWP) primarily estimate when measured correctly?
• A) Left ventricular end-diastolic pressure (LVEDP) and left atrial
filling pressure (left heart preload).
, • B) Right ventricular contractility and stroke volume.
• C) Total systemic vascular resistance.
• D) Pulmonary capillary membrane permeability.
Correct Answer: A
Rationale: When the balloon is inflated, blood flow past the tip stops,
creating a static column of blood that reflects left atrial pressure and
left ventricular end-diastolic pressure.
QUESTION 5: What life-threatening dysrhythmia is most commonly
provoked during the insertion or accidental migration of a pulmonary
artery catheter into the right ventricle?
• A) Premature Ventricular Contractions (PVCs) or Ventricular
Tachycardia (VT) / Ventricular Fibrillation (VF).
• B) Symptomatic sinus bradycardia.
• C) Atrial fibrillation with rapid ventricular response.
• D) Third-degree heart block.
Correct Answer: A
Rationale: Physical irritation of the right ventricular endocardium by the
catheter tip commonly precipitates ventricular ectopy, PVCs, or
ventricular tachycardia.
QUESTION 6: What is the maximum recommended duration for
keeping a pulmonary artery catheter balloon inflated when obtaining a
wedge pressure measurement?
• A) No longer than 10 to 15 seconds (or 1 to 2 respiratory cycles) to
prevent distal ischemia and pulmonary infarction.
