CRNA Nurse Anesthesia Prep practice questions and answers 2026. Tap an option to test yourself — you'll see the correct answer and a plain-English explanation for every question. Free, no login.
Q21All of the following factors could potentially affect the accuracy of a non-invasive blood pressure (NIBP) measurement except:
✓ Correct answer: C. Electrical interference from nearby devices
Answer: Electrical interference from nearby devices While electrical interference from nearby devices can affect many types of medical equipment, it is generally not a significant factor in non-invasive blood pressure (NIBP) measurement accuracy. More critical factors include ensuring that the correct cuff size is used, the cuff is properly placed on the patient, and the patient remains still during the measurement. These steps help ensure accurate readings. Conversely, electrical interference is more commonly associated with issues in devices such as ECGs, where it can create artifacts in the readings.
Q22By what percentage does oxygen consumption typically increase during physical exertion?
✓ Correct answer: B. 400% to 500%
During physical exertion, oxygen consumption can increase significantly, often by 400% to 500%. Managing this increase in demand is crucial for maintaining adequate oxygenation during intense activity.
Q23Which of the following will not enhance the effectiveness of a mechanical ventilator in improving patient oxygenation?
✓ Correct answer: D. Reducing tidal volume
Answer: Reducing tidal volume Reducing tidal volume will decrease the effectiveness of mechanical ventilation in improving oxygenation. Increasing positive end-expiratory pressure (PEEP), increasing inspiratory time, and increasing fraction of inspired oxygen ($$FiO_{2}$$) will all enhance oxygenation.
Q24Which of the following statements is true regarding the materials used in the construction of anesthesia masks?
✓ Correct answer: B. Materials with high flexibility and durability are preferred for anesthesia masks to ensure a proper fit and patient comfort
Answer: Materials with high flexibility and durability are preferred for anesthesia masks to ensure a proper fit and patient comfort. Flexibility and durability are critical factors in selecting materials for anesthesia masks. High flexibility ensures a proper fit, while durability ensures that the mask can withstand repeated use without compromising its structural integrity. Although resistance to chemicals and heat are important considerations, the primary focus is on flexibility and durability to maintain a secure and comfortable fit for the patient.
Q25Which of the following statements is true about advanced pulse oximeters?
✓ Correct answer: D. Pulse oximeters can provide accurate readings despite variations in skin pigmentation.
Answer: Pulse oximeters can provide accurate readings despite variations in skin pigmentation. Advanced pulse oximeters use algorithms to account for differences in skin pigmentation, ensuring accurate readings. Strong ambient light and patient movement can affect older models, but newer pulse oximeters are designed to minimize these interferences. High carboxyhemoglobin levels can lead to inaccurate readings, but this issue is primarily associated with older pulse oximeter technologies.
Q26A patient with a history of chronic obstructive pulmonary disease (COPD) is being prepared for lung surgery. Based on the information provided in this scenario, which of the following ventilator settings is most appropriate for this patient?
✓ Correct answer: B. Volume-controlled ventilation
Answer: Volume-controlled ventilation Patients with chronic obstructive pulmonary disease (COPD) often require specific ventilatory management to ensure effective gas exchange during surgery. Volume-controlled ventilation is the preferred mode as it delivers a consistent tidal volume, reducing the risk of hyperinflation and barotrauma. Pressure-controlled ventilation can be beneficial for certain conditions but may not provide the consistent tidal volume needed for COPD patients. High-frequency oscillatory ventilation and spontaneous breathing modes are generally not recommended for patients with COPD during surgery due to the increased risk of ventilator-induced lung injury and inadequate ventilation.
Q27Which of the following is the most important safety consideration when using a laser in surgical procedures?
✓ Correct answer: A. Potential for thermal injury to tissues
Answer: Potential for thermal injury to tissues Lasers used in surgical procedures concentrate light energy to incise or ablate tissues, which can result in thermal injury if not properly controlled. While there may be risks of electrical shock or exposure to biohazardous materials, the thermal injury to tissues is the primary safety concern. Inhaling anesthetic gases is not a typical risk directly associated with laser use in surgery.
Q28Which of the following represents the normal range for central venous pressure (CVP) in a healthy adult?
✓ Correct answer: D. 2-6 mmHg
Answer: 2-6 mmHg Central venous pressure (CVP) reflects the pressure in the thoracic vena cava, near the right atrium of the heart. It is a good indicator of right ventricular function and venous blood return to the heart. The normal range for CVP is 2-6 mmHg.
Q29Which of the following statements is true regarding a pulse oximeter?
✓ Correct answer: A. It measures the oxygen saturation level of hemoglobin in arterial blood.
The correct answer is that a pulse oximeter measures the oxygen saturation level of hemoglobin in arterial blood. This device uses light absorption through a pulsating vascular bed to estimate the percent of hemoglobin that is saturated with oxygen. The device does not measure carbon dioxide levels, hemoglobin concentration, or respiratory rate.
Q30During the setup of invasive hemodynamic monitoring for a patient in the intensive care unit, which of the following central venous catheter (CVC) insertion sites is preferred for reducing the risk of catheter-related bloodstream infections while providing reliable access?
✓ Correct answer: B. Subclavian vein
Correct answer: Subclavian vein Central venous catheters (CVCs) are utilized for a variety of critical care purposes, including the administration of medications, hemodynamic monitoring, and fluid resuscitation. The choice of insertion site can significantly impact the risk of complications, particularly catheter-related bloodstream infections (CRBSIs). The subclavian vein has been shown to have a lower incidence of CRBSIs compared to the internal jugular and femoral veins, making it a more favorable site for long-term CVC placement when clinical conditions allow. While the internal jugular vein is also commonly used, it has a higher risk of infection. The femoral vein, although easy to access, is associated with the highest risk of CRBSIs. The external jugular vein is rarely used due to its smaller size and more challenging access.
Use the free CRNA Nurse Anesthesia Prep sample, download the PDF, then unlock web-based timed mock exams for a full exam rehearsal.
Theory