ATLS 11 Abdominal & Pelvic Trauma Study Guide |
Practice Questions, Answers & Detailed Rationales |
Exam Prep 2026/2027
Question 1: In the ATLS 11th edition, which component precedes the
traditional ABCDE assessment to address the most immediate threat to
life in a trauma patient?
A. Airway maintenance with cervical spine protection
B. Breathing and ventilation assessment
C. Control of exsanguinating external hemorrhage
D. Disability and neurological evaluation
CORRECT ANSWER: C. Control of exsanguinating external hemorrhage
Rationale: The ATLS 11th edition introduced the xABCDE approach, where
"x" represents the control of exsanguinating hemorrhage. This priority
reflects the understanding that catastrophic external bleeding must be
controlled immediately, before airway and breathing assessments, as it
poses the most rapid threat to life. Hemorrhage control maneuvers such as
direct pressure, tourniquet application, or wound packing should be
performed simultaneously with initial assessment.
Question 2: Which intra-abdominal organ is most commonly injured in
blunt abdominal trauma?
A. Liver
B. Spleen
C. Small bowel
D. Pancreas
CORRECT ANSWER: B. Spleen
Rationale: The spleen is the most frequently injured organ in blunt
abdominal trauma, accounting for approximately 40-55% of cases.
Located in the left upper quadrant beneath the ribs, it is vulnerable to
compression injuries from direct blows, motor vehicle collisions, and falls.
Splenic injuries can result in significant intraperitoneal hemorrhage and
may require operative intervention or angioembolization depending on
hemodynamic stability and injury grade.
,Question 3: A hemodynamically unstable trauma patient has a positive
FAST examination showing free fluid in the peritoneal cavity. What is
the most appropriate management?
A. Obtain contrast-enhanced CT of the abdomen and pelvis
B. Perform diagnostic peritoneal lavage to confirm the finding
C. Proceed immediately to laparotomy
D. Repeat the FAST examination in 30 minutes
CORRECT ANSWER: C. Proceed immediately to laparotomy
Rationale: In a hemodynamically unstable patient with a positive FAST
examination, the presence of intraperitoneal free fluid indicates significant
hemoperitoneum requiring immediate surgical intervention. Transferring
such a patient to CT would delay definitive hemorrhage control and risk
decompensation or death during imaging. Diagnostic peritoneal lavage is
unnecessary when FAST is positive, and repeat FAST would waste critical
time. The cornerstone of management is rapid hemorrhage control via
exploratory laparotomy.
Question 4: Which FAST examination window is used to assess for fluid
in the hepatorenal recess (Morison's pouch)?
A. Pericardial window
B. Right upper quadrant window
C. Left upper quadrant window
D. Pelvic window
CORRECT ANSWER: B. Right upper quadrant window
Rationale: The right upper quadrant (RUQ) FAST window evaluates the
hepatorenal recess (Morison's pouch), the space between the liver and
right kidney. In a supine trauma patient, this is the most dependent portion
of the upper abdomen where free fluid accumulates first. The RUQ view
also assesses the right pleural space for hemothorax and the inferior
thoracic cavity.
Question 5: A trauma patient with blunt abdominal injury has a seat
belt sign across the lower abdomen. What is the clinical significance of
this finding?
A. It indicates superficial bruising only and requires no further evaluation
B. It eliminates concern for intra-abdominal injury
,C. It raises concern for bowel and mesenteric injury, which may present
late
D. It confirms the presence of splenic injury
CORRECT ANSWER: C. It raises concern for bowel and mesenteric
injury, which may present late
Rationale: A seat belt sign across the abdomen is a significant finding that
should raise suspicion for hollow viscus and mesenteric injuries. These
injuries often result from shearing forces during rapid deceleration and may
not present with immediate peritonitis. Clinical deterioration can occur
hours later. Patients with seat belt signs warrant close observation, serial
abdominal examinations, and appropriate imaging even if initially stable.
Question 6: Which of the following is the most appropriate initial
management for a pelvic fracture with hemodynamic instability?
A. Immediate transfer to CT for definitive imaging
B. Application of a pelvic binder at the level of the greater trochanters
C. Placement of a Foley catheter before imaging
D. Administration of 2 liters of crystalloid before transfusion
CORRECT ANSWER: B. Application of a pelvic binder at the level of the
greater trochanters
Rationale: Pelvic binder application is the immediate priority in suspected
pelvic fracture with hemodynamic instability. The binder should be
centered over the greater trochanters, not the iliac crests, to effectively
reduce pelvic volume and provide tamponade for venous bleeding. It
stabilizes the pelvis rotationally and can control venous hemorrhage,
though arterial bleeding may require angioembolization or surgical packing.
Question 7: What is the primary advantage of focused assessment with
sonography for trauma (FAST) compared to diagnostic peritoneal lavage
(DPL)?
A. FAST can identify specific organ injuries
B. FAST is non-invasive, rapid, and repeatable at the bedside
C. FAST has higher sensitivity for hollow viscus injury
D. FAST provides definitive management guidance for solid organ injuries
CORRECT ANSWER: B. FAST is non-invasive, rapid, and repeatable at
the bedside
, Rationale: FAST has largely replaced DPL as the initial diagnostic adjunct
for detecting hemoperitoneum in trauma patients. Its advantages include
being non-invasive, quickly performed at the bedside, repeatable for serial
assessments, and without the risks of peritoneal catheter placement.
However, FAST primarily detects free fluid and does not identify specific
organ injuries or reliably detect hollow viscus injuries, which limits its
sensitivity for certain injury patterns.
Question 8: A patient with anterior-posterior compression (APC) pelvic
fracture is at highest risk for which of the following?
A. Femoral nerve injury
B. Massive hemorrhage from the posterior pelvic venous plexus
C. Isolated acetabular fracture
D. Bladder rupture without hemorrhage
CORRECT ANSWER: B. Massive hemorrhage from the posterior pelvic
venous plexus
Rationale: Anterior-posterior compression ("open book") pelvic fractures
involve disruption of the pubic symphysis and posterior pelvic ring, creating
increased pelvic volume and potential for massive hemorrhage. The
posterior venous plexus and branches of the internal iliac artery are at risk.
APC injuries are associated with higher mortality due to hemorrhage and
require aggressive resuscitation, pelvic binder application, and
consideration of angioembolization or preperitoneal packing.
Question 9: Which finding on physical examination most strongly
suggests peritoneal irritation following abdominal trauma?
A. Mild abdominal distension
B. Involuntary guarding and rigidity
C. Decreased bowel sounds
D. Ecchymosis over the flank
CORRECT ANSWER: B. Involuntary guarding and rigidity
Rationale: Involuntary guarding and abdominal rigidity are classic signs of
peritoneal irritation, indicating blood, gastrointestinal contents, or other
inflammatory material in the peritoneal cavity. These findings mandate
urgent surgical evaluation and likely laparotomy. Mild distension,
Practice Questions, Answers & Detailed Rationales |
Exam Prep 2026/2027
Question 1: In the ATLS 11th edition, which component precedes the
traditional ABCDE assessment to address the most immediate threat to
life in a trauma patient?
A. Airway maintenance with cervical spine protection
B. Breathing and ventilation assessment
C. Control of exsanguinating external hemorrhage
D. Disability and neurological evaluation
CORRECT ANSWER: C. Control of exsanguinating external hemorrhage
Rationale: The ATLS 11th edition introduced the xABCDE approach, where
"x" represents the control of exsanguinating hemorrhage. This priority
reflects the understanding that catastrophic external bleeding must be
controlled immediately, before airway and breathing assessments, as it
poses the most rapid threat to life. Hemorrhage control maneuvers such as
direct pressure, tourniquet application, or wound packing should be
performed simultaneously with initial assessment.
Question 2: Which intra-abdominal organ is most commonly injured in
blunt abdominal trauma?
A. Liver
B. Spleen
C. Small bowel
D. Pancreas
CORRECT ANSWER: B. Spleen
Rationale: The spleen is the most frequently injured organ in blunt
abdominal trauma, accounting for approximately 40-55% of cases.
Located in the left upper quadrant beneath the ribs, it is vulnerable to
compression injuries from direct blows, motor vehicle collisions, and falls.
Splenic injuries can result in significant intraperitoneal hemorrhage and
may require operative intervention or angioembolization depending on
hemodynamic stability and injury grade.
,Question 3: A hemodynamically unstable trauma patient has a positive
FAST examination showing free fluid in the peritoneal cavity. What is
the most appropriate management?
A. Obtain contrast-enhanced CT of the abdomen and pelvis
B. Perform diagnostic peritoneal lavage to confirm the finding
C. Proceed immediately to laparotomy
D. Repeat the FAST examination in 30 minutes
CORRECT ANSWER: C. Proceed immediately to laparotomy
Rationale: In a hemodynamically unstable patient with a positive FAST
examination, the presence of intraperitoneal free fluid indicates significant
hemoperitoneum requiring immediate surgical intervention. Transferring
such a patient to CT would delay definitive hemorrhage control and risk
decompensation or death during imaging. Diagnostic peritoneal lavage is
unnecessary when FAST is positive, and repeat FAST would waste critical
time. The cornerstone of management is rapid hemorrhage control via
exploratory laparotomy.
Question 4: Which FAST examination window is used to assess for fluid
in the hepatorenal recess (Morison's pouch)?
A. Pericardial window
B. Right upper quadrant window
C. Left upper quadrant window
D. Pelvic window
CORRECT ANSWER: B. Right upper quadrant window
Rationale: The right upper quadrant (RUQ) FAST window evaluates the
hepatorenal recess (Morison's pouch), the space between the liver and
right kidney. In a supine trauma patient, this is the most dependent portion
of the upper abdomen where free fluid accumulates first. The RUQ view
also assesses the right pleural space for hemothorax and the inferior
thoracic cavity.
Question 5: A trauma patient with blunt abdominal injury has a seat
belt sign across the lower abdomen. What is the clinical significance of
this finding?
A. It indicates superficial bruising only and requires no further evaluation
B. It eliminates concern for intra-abdominal injury
,C. It raises concern for bowel and mesenteric injury, which may present
late
D. It confirms the presence of splenic injury
CORRECT ANSWER: C. It raises concern for bowel and mesenteric
injury, which may present late
Rationale: A seat belt sign across the abdomen is a significant finding that
should raise suspicion for hollow viscus and mesenteric injuries. These
injuries often result from shearing forces during rapid deceleration and may
not present with immediate peritonitis. Clinical deterioration can occur
hours later. Patients with seat belt signs warrant close observation, serial
abdominal examinations, and appropriate imaging even if initially stable.
Question 6: Which of the following is the most appropriate initial
management for a pelvic fracture with hemodynamic instability?
A. Immediate transfer to CT for definitive imaging
B. Application of a pelvic binder at the level of the greater trochanters
C. Placement of a Foley catheter before imaging
D. Administration of 2 liters of crystalloid before transfusion
CORRECT ANSWER: B. Application of a pelvic binder at the level of the
greater trochanters
Rationale: Pelvic binder application is the immediate priority in suspected
pelvic fracture with hemodynamic instability. The binder should be
centered over the greater trochanters, not the iliac crests, to effectively
reduce pelvic volume and provide tamponade for venous bleeding. It
stabilizes the pelvis rotationally and can control venous hemorrhage,
though arterial bleeding may require angioembolization or surgical packing.
Question 7: What is the primary advantage of focused assessment with
sonography for trauma (FAST) compared to diagnostic peritoneal lavage
(DPL)?
A. FAST can identify specific organ injuries
B. FAST is non-invasive, rapid, and repeatable at the bedside
C. FAST has higher sensitivity for hollow viscus injury
D. FAST provides definitive management guidance for solid organ injuries
CORRECT ANSWER: B. FAST is non-invasive, rapid, and repeatable at
the bedside
, Rationale: FAST has largely replaced DPL as the initial diagnostic adjunct
for detecting hemoperitoneum in trauma patients. Its advantages include
being non-invasive, quickly performed at the bedside, repeatable for serial
assessments, and without the risks of peritoneal catheter placement.
However, FAST primarily detects free fluid and does not identify specific
organ injuries or reliably detect hollow viscus injuries, which limits its
sensitivity for certain injury patterns.
Question 8: A patient with anterior-posterior compression (APC) pelvic
fracture is at highest risk for which of the following?
A. Femoral nerve injury
B. Massive hemorrhage from the posterior pelvic venous plexus
C. Isolated acetabular fracture
D. Bladder rupture without hemorrhage
CORRECT ANSWER: B. Massive hemorrhage from the posterior pelvic
venous plexus
Rationale: Anterior-posterior compression ("open book") pelvic fractures
involve disruption of the pubic symphysis and posterior pelvic ring, creating
increased pelvic volume and potential for massive hemorrhage. The
posterior venous plexus and branches of the internal iliac artery are at risk.
APC injuries are associated with higher mortality due to hemorrhage and
require aggressive resuscitation, pelvic binder application, and
consideration of angioembolization or preperitoneal packing.
Question 9: Which finding on physical examination most strongly
suggests peritoneal irritation following abdominal trauma?
A. Mild abdominal distension
B. Involuntary guarding and rigidity
C. Decreased bowel sounds
D. Ecchymosis over the flank
CORRECT ANSWER: B. Involuntary guarding and rigidity
Rationale: Involuntary guarding and abdominal rigidity are classic signs of
peritoneal irritation, indicating blood, gastrointestinal contents, or other
inflammatory material in the peritoneal cavity. These findings mandate
urgent surgical evaluation and likely laparotomy. Mild distension,
