Fall Semester 2026–2027 SURG240 – Operating Room
Safety Updated 2026 | 190+ Questions and Answers |
Operating Room Safety Comprehensive Study Guide,
Practice Exam, Exam Prep Test Bank, Perioperative
Nursing, Sterile Technique, Surgical Asepsis, Infection
Prevention, Patient Positioning, Surgical Instrumentation,
Fire Safety, Anesthesia Safety, Team Communication,
Clinical Judgment, Detailed Rationales and Complete
Revision Material
Question 1: A surgical fire is a rare but devastating complication in the
operating room. According to the principles of the fire triangle, which of the
following is the most appropriate initial step for the circulating nurse to take
when a fire is discovered on the patient's drapes?
A. Extinguish the fire with a CO2 extinguisher
B. Call for a hospital-wide "Code Red"
C. Stop the flow of oxygen to the patient
D. Remove the drapes and throw them on the floor
CORRECT ANSWER: C. Stop the flow of oxygen to the patient
Rationale: The fire triangle consists of an oxidizer, a fuel source, and an ignition source.
In the OR, oxygen is the primary oxidizer that accelerates combustion. The immediate
priority is to eliminate the oxidizer to rapidly diminish the fire's intensity. While
removing drapes and calling for help are subsequent steps, stopping the oxygen flow is
the most critical initial action to halt the rapid escalation of the fire.
Question 2: In the context of surgical site marking, the "World Health
Organization (WHO) Surgical Safety Checklist" mandates that the site marking
be performed by whom, and under what specific condition?
A. The circulating nurse, prior to the patient receiving any sedation
B. The surgeon who will perform the procedure, with the patient awake and involved if
possible
C. Any licensed independent practitioner, immediately after the patient is anesthetized
D. The charge nurse, based on the operative consent and schedule
CORRECT ANSWER: B. The surgeon who will perform the procedure, with the
patient awake and involved if possible
Rationale: The WHO guidelines stipulate that the surgical site marking should be
performed by the surgeon who will be conducting the operation. It should ideally be
done with the patient awake and involved to confirm the correct side, site, and level,
thereby serving as a definitive check against wrong-site surgery. Marking after
anesthesia induction defeats the purpose of patient verification.
Question 3: In preparing a sterile field for a major abdominal procedure, a
surgical technologist notices a one-inch tear in the sterile drape after it has
been placed. What is the most appropriate and safe course of action?
,A. Cover the tear with a sterile towel immediately
B. Ignore the tear as it is smaller than the acceptable limit for microbial penetration
C. Remove and replace the entire sterile drape
D. Secure the tear with sterile tape from the instrument tray
CORRECT ANSWER: C. Remove and replace the entire sterile drape
Rationale: A sterile barrier must be intact to maintain the aseptic field. Any tear or
puncture in a sterile drape compromises its integrity, providing a pathway for
microorganisms from the non-sterile surface below to migrate to the sterile field via
capillary action or gravity. Covering the hole with a sterile towel is considered a
temporary measure for small pinpricks, but a one-inch tear is significant and requires
complete replacement of the drape to ensure patient safety.
Question 4: A patient is undergoing a procedure under general anesthesia. The
anesthesia provider notes a sudden, sharp decrease in end-tidal CO2 (EtCO2)
with no change in respiratory rate or tidal volume, accompanied by acute
hypotension. This clinical picture is most indicative of which of the following
intraoperative emergencies?
A. Malignant hyperthermia
B. Anaphylactic shock
C. Venous air embolism
D. Bronchospasm
CORRECT ANSWER: C. Venous air embolism
Rationale: A sudden drop in EtCO2 is a hallmark sign of a venous air embolism (VAE).
The air trapped in the pulmonary vasculature creates a "gas lock," leading to a
ventilation-perfusion (V/Q) mismatch and increased dead space. This results in the
exhaled air having less CO2. Hypotension follows due to decreased cardiac output from
right ventricular outflow obstruction. This is particularly a risk in neurosurgery in the
sitting position or during central line placement.
Question 5: During a total hip arthroplasty, the surgical team utilizes bone
cement (polymethylmethacrylate). The patient suddenly becomes profoundly
hypotensive, tachycardic, and hypoxemic. This reaction is most consistent
with:
A. Fat embolism syndrome
B. Bone cement implantation syndrome
C. Local anesthetic systemic toxicity
D. Tourniquet-induced ischemia
CORRECT ANSWER: B. Bone cement implantation syndrome
Rationale: Bone cement implantation syndrome (BCIS) is a known complication
characterized by hypotension, hypoxia, and cardiac arrhythmias occurring at the time of
cementing, prosthesis insertion, or limb re-perfusion. The pathophysiology is
,multifactorial, involving embolization of marrow contents, vasodilation, and histamine
release. It is a classic, well-recognized intraoperative emergency in orthopedic surgery.
Question 6: The "time-out" is a critical component of the Universal Protocol.
What is the single most important purpose of performing the time-out
immediately prior to the surgical incision?
A. To ensure all surgical team members have had a rest break
B. To provide a final, active verification of the correct patient, procedure, and site
C. To allow the circulating nurse to document the start time of the surgery
D. To give the surgeon the opportunity to review the patient's labs
CORRECT ANSWER: B. To provide a final, active verification of the correct
patient, procedure, and site
Rationale: The "time-out" is the final patient safety check performed in the operating
room just before the procedure begins. Its sole purpose is to actively and verbally verify
the correct patient identity, the correct surgical site, and the correct procedure to be
performed, thereby acting as the last line of defense against wrong-site, wrong-
procedure, and wrong-patient surgery.
Question 7: When utilizing an electrosurgical unit (ESU) in the operating room,
what is the critical safety principle regarding the placement of the dispersive
electrode (grounding pad)?
A. It should be placed over a bony prominence to ensure a firm connection
B. It should be placed as close to the surgical site as possible to minimize resistance
C. It should be placed over a large, well-vascularized muscle mass, near the surgical site
D. It must be placed on the opposite side of the body from the surgical site
CORRECT ANSWER: C. It should be placed over a large, well-vascularized
muscle mass, near the surgical site
Rationale: The dispersive electrode provides a safe return path for the electrical current
to the ESU generator. To prevent burns at the pad site, it must be placed over a large,
well-perfused muscle mass (e.g., anterior thigh, buttocks). This provides a large surface
area for current density to be low. Placing it near the surgical site helps ensure the
current path is direct. Bony prominences have poor vascularity and high resistance,
increasing the risk of thermal injury.
Question 8: In the event of an inadvertent needle stick injury to a surgical
team member, what is the immediate first step in the post-exposure protocol?
A. Have the team member squeeze the wound to express blood
B. Report the incident to the Occupational Health department
C. Wash the wound with soap and water and allow it to bleed freely
D. Initiate post-exposure prophylaxis for HIV
CORRECT ANSWER: C. Wash the wound with soap and water and allow it to
bleed freely
, Rationale: The immediate first aid for a percutaneous injury is to wash the wound with
soap and water. It is also recommended to allow the wound to bleed freely. Squeezing
the wound to express blood is no longer recommended as it can cause further tissue
damage. Reporting to Occupational Health is the next step, and initiating PEP is a
decision made by a clinician based on the exposure risk.
Question 9: The use of a pneumatic tourniquet is common in extremity
surgery. What is a primary physiological consequence of tourniquet inflation
that the surgical team must monitor for, in addition to ischemia, particularly
upon its deflation?
A. Metabolic alkalosis
B. Rebound hyperthermia
C. Reperfusion injury and metabolic acidosis
D. Severe hypertension
CORRECT ANSWER: C. Reperfusion injury and metabolic acidosis
Rationale: Tourniquet inflation causes distal ischemia leading to anaerobic metabolism
and a buildup of lactic acid. Upon deflation, this acidic blood and metabolic byproducts
are released into the central circulation, causing a transient metabolic acidosis, which
can lead to hypotension. This is often referred to as "tourniquet deflation syndrome."
Reperfusion injury can also occur due to the sudden reintroduction of oxygen,
generating reactive oxygen species.
Question 10: The surgical count, performed at the start, during, and at the end
of a procedure, is a vital safety measure. What is the primary rationale for
counting sponges and instruments, especially during a procedure involving an
open cavity?
A. To ensure the hospital has an accurate inventory of supplies
B. To prevent the unintentional retention of a foreign body (RSI)
C. To document the time spent performing the surgical procedure
D. To calculate the total operative blood loss for the patient
CORRECT ANSWER: B. To prevent the unintentional retention of a foreign
body (RSI)
Rationale: The primary and most critical purpose of the surgical count is to prevent a
retained surgical item (RSI), such as a sponge, needle, or instrument, from being left
inside a patient's body. A final count that is incorrect triggers a series of safety protocols,
including X-ray imaging, to locate the missing item before the patient leaves the OR.
This is a cornerstone of patient safety.
Question 11: A patient is undergoing a laparoscopic cholecystectomy. The
surgeon plans to insufflate the abdomen with CO2. Which of the following
physiological changes is a direct and immediate effect of this
pneumoperitoneum that the anesthesia provider must anticipate?
Safety Updated 2026 | 190+ Questions and Answers |
Operating Room Safety Comprehensive Study Guide,
Practice Exam, Exam Prep Test Bank, Perioperative
Nursing, Sterile Technique, Surgical Asepsis, Infection
Prevention, Patient Positioning, Surgical Instrumentation,
Fire Safety, Anesthesia Safety, Team Communication,
Clinical Judgment, Detailed Rationales and Complete
Revision Material
Question 1: A surgical fire is a rare but devastating complication in the
operating room. According to the principles of the fire triangle, which of the
following is the most appropriate initial step for the circulating nurse to take
when a fire is discovered on the patient's drapes?
A. Extinguish the fire with a CO2 extinguisher
B. Call for a hospital-wide "Code Red"
C. Stop the flow of oxygen to the patient
D. Remove the drapes and throw them on the floor
CORRECT ANSWER: C. Stop the flow of oxygen to the patient
Rationale: The fire triangle consists of an oxidizer, a fuel source, and an ignition source.
In the OR, oxygen is the primary oxidizer that accelerates combustion. The immediate
priority is to eliminate the oxidizer to rapidly diminish the fire's intensity. While
removing drapes and calling for help are subsequent steps, stopping the oxygen flow is
the most critical initial action to halt the rapid escalation of the fire.
Question 2: In the context of surgical site marking, the "World Health
Organization (WHO) Surgical Safety Checklist" mandates that the site marking
be performed by whom, and under what specific condition?
A. The circulating nurse, prior to the patient receiving any sedation
B. The surgeon who will perform the procedure, with the patient awake and involved if
possible
C. Any licensed independent practitioner, immediately after the patient is anesthetized
D. The charge nurse, based on the operative consent and schedule
CORRECT ANSWER: B. The surgeon who will perform the procedure, with the
patient awake and involved if possible
Rationale: The WHO guidelines stipulate that the surgical site marking should be
performed by the surgeon who will be conducting the operation. It should ideally be
done with the patient awake and involved to confirm the correct side, site, and level,
thereby serving as a definitive check against wrong-site surgery. Marking after
anesthesia induction defeats the purpose of patient verification.
Question 3: In preparing a sterile field for a major abdominal procedure, a
surgical technologist notices a one-inch tear in the sterile drape after it has
been placed. What is the most appropriate and safe course of action?
,A. Cover the tear with a sterile towel immediately
B. Ignore the tear as it is smaller than the acceptable limit for microbial penetration
C. Remove and replace the entire sterile drape
D. Secure the tear with sterile tape from the instrument tray
CORRECT ANSWER: C. Remove and replace the entire sterile drape
Rationale: A sterile barrier must be intact to maintain the aseptic field. Any tear or
puncture in a sterile drape compromises its integrity, providing a pathway for
microorganisms from the non-sterile surface below to migrate to the sterile field via
capillary action or gravity. Covering the hole with a sterile towel is considered a
temporary measure for small pinpricks, but a one-inch tear is significant and requires
complete replacement of the drape to ensure patient safety.
Question 4: A patient is undergoing a procedure under general anesthesia. The
anesthesia provider notes a sudden, sharp decrease in end-tidal CO2 (EtCO2)
with no change in respiratory rate or tidal volume, accompanied by acute
hypotension. This clinical picture is most indicative of which of the following
intraoperative emergencies?
A. Malignant hyperthermia
B. Anaphylactic shock
C. Venous air embolism
D. Bronchospasm
CORRECT ANSWER: C. Venous air embolism
Rationale: A sudden drop in EtCO2 is a hallmark sign of a venous air embolism (VAE).
The air trapped in the pulmonary vasculature creates a "gas lock," leading to a
ventilation-perfusion (V/Q) mismatch and increased dead space. This results in the
exhaled air having less CO2. Hypotension follows due to decreased cardiac output from
right ventricular outflow obstruction. This is particularly a risk in neurosurgery in the
sitting position or during central line placement.
Question 5: During a total hip arthroplasty, the surgical team utilizes bone
cement (polymethylmethacrylate). The patient suddenly becomes profoundly
hypotensive, tachycardic, and hypoxemic. This reaction is most consistent
with:
A. Fat embolism syndrome
B. Bone cement implantation syndrome
C. Local anesthetic systemic toxicity
D. Tourniquet-induced ischemia
CORRECT ANSWER: B. Bone cement implantation syndrome
Rationale: Bone cement implantation syndrome (BCIS) is a known complication
characterized by hypotension, hypoxia, and cardiac arrhythmias occurring at the time of
cementing, prosthesis insertion, or limb re-perfusion. The pathophysiology is
,multifactorial, involving embolization of marrow contents, vasodilation, and histamine
release. It is a classic, well-recognized intraoperative emergency in orthopedic surgery.
Question 6: The "time-out" is a critical component of the Universal Protocol.
What is the single most important purpose of performing the time-out
immediately prior to the surgical incision?
A. To ensure all surgical team members have had a rest break
B. To provide a final, active verification of the correct patient, procedure, and site
C. To allow the circulating nurse to document the start time of the surgery
D. To give the surgeon the opportunity to review the patient's labs
CORRECT ANSWER: B. To provide a final, active verification of the correct
patient, procedure, and site
Rationale: The "time-out" is the final patient safety check performed in the operating
room just before the procedure begins. Its sole purpose is to actively and verbally verify
the correct patient identity, the correct surgical site, and the correct procedure to be
performed, thereby acting as the last line of defense against wrong-site, wrong-
procedure, and wrong-patient surgery.
Question 7: When utilizing an electrosurgical unit (ESU) in the operating room,
what is the critical safety principle regarding the placement of the dispersive
electrode (grounding pad)?
A. It should be placed over a bony prominence to ensure a firm connection
B. It should be placed as close to the surgical site as possible to minimize resistance
C. It should be placed over a large, well-vascularized muscle mass, near the surgical site
D. It must be placed on the opposite side of the body from the surgical site
CORRECT ANSWER: C. It should be placed over a large, well-vascularized
muscle mass, near the surgical site
Rationale: The dispersive electrode provides a safe return path for the electrical current
to the ESU generator. To prevent burns at the pad site, it must be placed over a large,
well-perfused muscle mass (e.g., anterior thigh, buttocks). This provides a large surface
area for current density to be low. Placing it near the surgical site helps ensure the
current path is direct. Bony prominences have poor vascularity and high resistance,
increasing the risk of thermal injury.
Question 8: In the event of an inadvertent needle stick injury to a surgical
team member, what is the immediate first step in the post-exposure protocol?
A. Have the team member squeeze the wound to express blood
B. Report the incident to the Occupational Health department
C. Wash the wound with soap and water and allow it to bleed freely
D. Initiate post-exposure prophylaxis for HIV
CORRECT ANSWER: C. Wash the wound with soap and water and allow it to
bleed freely
, Rationale: The immediate first aid for a percutaneous injury is to wash the wound with
soap and water. It is also recommended to allow the wound to bleed freely. Squeezing
the wound to express blood is no longer recommended as it can cause further tissue
damage. Reporting to Occupational Health is the next step, and initiating PEP is a
decision made by a clinician based on the exposure risk.
Question 9: The use of a pneumatic tourniquet is common in extremity
surgery. What is a primary physiological consequence of tourniquet inflation
that the surgical team must monitor for, in addition to ischemia, particularly
upon its deflation?
A. Metabolic alkalosis
B. Rebound hyperthermia
C. Reperfusion injury and metabolic acidosis
D. Severe hypertension
CORRECT ANSWER: C. Reperfusion injury and metabolic acidosis
Rationale: Tourniquet inflation causes distal ischemia leading to anaerobic metabolism
and a buildup of lactic acid. Upon deflation, this acidic blood and metabolic byproducts
are released into the central circulation, causing a transient metabolic acidosis, which
can lead to hypotension. This is often referred to as "tourniquet deflation syndrome."
Reperfusion injury can also occur due to the sudden reintroduction of oxygen,
generating reactive oxygen species.
Question 10: The surgical count, performed at the start, during, and at the end
of a procedure, is a vital safety measure. What is the primary rationale for
counting sponges and instruments, especially during a procedure involving an
open cavity?
A. To ensure the hospital has an accurate inventory of supplies
B. To prevent the unintentional retention of a foreign body (RSI)
C. To document the time spent performing the surgical procedure
D. To calculate the total operative blood loss for the patient
CORRECT ANSWER: B. To prevent the unintentional retention of a foreign
body (RSI)
Rationale: The primary and most critical purpose of the surgical count is to prevent a
retained surgical item (RSI), such as a sponge, needle, or instrument, from being left
inside a patient's body. A final count that is incorrect triggers a series of safety protocols,
including X-ray imaging, to locate the missing item before the patient leaves the OR.
This is a cornerstone of patient safety.
Question 11: A patient is undergoing a laparoscopic cholecystectomy. The
surgeon plans to insufflate the abdomen with CO2. Which of the following
physiological changes is a direct and immediate effect of this
pneumoperitoneum that the anesthesia provider must anticipate?
