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HLT-EMT39-02 · Lesson 7 · 22.5 clock hours · theory

Abdominal and Genitourinary Trauma

Objective. Students will describe the anatomical zones of the abdomen, classify solid and hollow organ injury patterns, and state pre-hospital management priorities including evisceration care and impaled object management.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed clinician in the field or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

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Abdominal and Genitourinary Trauma

Anatomical Zones of the Abdomen

The abdomen is divided into regions that help clinicians predict injury patterns and guide assessment. The four quadrants — right upper, left upper, right lower, and left lower — are the most practical framework in the field. A more detailed division uses nine regions: epigastric, umbilical, hypogastric (pubic), and bilateral hypochondriac, lumbar, and iliac regions.

For trauma purposes, two functional compartments matter most:

The pelvic cavity sits below and contains the bladder, rectum, and internal reproductive organs. Pelvic fractures are a major source of life-threatening hemorrhage because the pelvic ring can hold large volumes of blood.

Solid vs. Hollow Organ Injuries

Solid organs — liver, spleen, kidneys, and pancreas — are highly vascular. When lacerated or ruptured, they bleed profusely. The liver is the most commonly injured abdominal organ in blunt trauma. The spleen is particularly vulnerable to left-sided blows and rib fractures at ribs 9–11. Splenic rupture can be immediate or delayed by days to weeks. Kidney injuries may produce hematuria (blood in the urine), though its absence does not rule out injury.

Hollow organs — stomach, intestines, gallbladder, bladder, ureters — contain contents under pressure. Blunt force can cause a sudden pressure rise that bursts the organ, spilling digestive enzymes, bile, urine, or feces into the abdominal cavity. This produces chemical peritonitis, followed hours later by bacterial peritonitis. Initial vital signs may be deceptively stable; pain and rigidity develop over time. Penetrating trauma (gunshot wounds, stab wounds) can perforate hollow organs directly and injure multiple structures along the projectile or blade path.

Mechanisms of Injury

Blunt trauma — motor vehicle collisions, falls, assaults, sports — transfers energy broadly. Seat belt syndrome is a recognized pattern: the lap belt can compress small bowel and mesentery, causing perforation, and the associated deceleration forces can fracture lumbar vertebrae (Chance fracture). Handlebar injuries in cyclists concentrate force on the epigastric area.

Penetrating trauma — knives, firearms — creates more predictable injury along the wound track, though high-velocity projectiles produce a temporary cavity effect that damages tissue well beyond the visible tract. Assume multiple organ involvement with any gunshot wound to the trunk.

Indicators of Internal Hemorrhage

Early recognition of internal abdominal hemorrhage is critical. Look for:

Hematuria suggests kidney or bladder injury. Tenderness over the pelvis on gentle compression suggests pelvic fracture with potential massive hemorrhage.

Pre-Hospital Management Priorities

Abdominal trauma is a load-and-go situation. Definitive care requires surgery; the paramedic's role is to recognize, support, and transport rapidly.

1. Scene safety and BSI: blood-borne pathogen exposure is significant.

2. Primary survey: airway, breathing, circulation. Control external hemorrhage. Establish IV access and fluid resuscitation per local protocol; avoid over-resuscitation that may worsen bleeding before surgical control.

3. Spinal motion restriction if mechanism warrants.

4. Do not remove impaled objects: stabilize in place with bulky dressings. Removal can release tamponade and cause sudden massive hemorrhage. Exception: an object obstructing CPR may need to be managed per medical direction.

5. Evisceration care: exposed bowel or organs must be kept moist and warm. Cover with a moist, sterile dressing, then a dry outer dressing. Do not attempt to replace organs into the abdomen. Do not allow the tissue to dry out or become contaminated further.

6. Keep the patient warm: hypothermia worsens coagulopathy and the trauma triad of death (hypothermia, acidosis, coagulopathy).

7. Pelvic fracture: apply a commercial pelvic binder or improvised sheet wrap at the level of the greater trochanters to reduce pelvic volume and tamponade hemorrhage, per protocol.

8. Position: supine with legs slightly flexed if tolerated, to reduce abdominal wall tension; follow spinal precautions if indicated.

9. Reassess vital signs frequently during transport and communicate trends to the receiving facility.

Safety Points

Key terms10

Peritoneal cavityThe body compartment enclosed by the peritoneum, containing most abdominal organs; injury here causes peritoneal irritation and can produce significant internal hemorrhage.
Retroperitoneal spaceThe area behind the peritoneum containing the kidneys, major blood vessels, pancreas, and portions of the bowel; injuries here may not produce early peritoneal signs, making recognition more difficult.
Solid organA highly vascular organ (liver, spleen, kidney, pancreas) that bleeds profusely when lacerated or ruptured.
Hollow organAn organ that contains a lumen (stomach, intestines, bladder); rupture spills contents and can cause peritonitis.
PeritonitisInflammation and infection of the peritoneal lining, often caused by spillage of bowel contents or urine; presents with abdominal rigidity, tenderness, and systemic signs of infection.
EviscerationProtrusion of abdominal organs through an open wound; managed by covering with a moist sterile dressing — organs must not be replaced in the field.
GuardingVoluntary contraction of abdominal muscles in response to pain or palpation, indicating underlying peritoneal irritation.
HematuriaBlood in the urine, a potential indicator of kidney or bladder injury; its absence does not rule out urinary tract trauma.
Seat belt syndromeA pattern of abdominal and spinal injuries caused by lap belt compression during rapid deceleration, potentially causing hollow organ perforation and lumbar fracture.
Pelvic binderA device applied circumferentially around the pelvis at the level of the greater trochanters to reduce pelvic volume and tamponade hemorrhage from pelvic fractures.
In class: Lecture with anatomical diagrams covering peritoneal and retroperitoneal organs, blunt vs. penetrating mechanisms, and indicators of internal hemorrhage; students label organs on blank abdominal diagrams. · Case photo and narrative exercise: students review four written patient presentations with vital signs trends and physical findings, classify likely organ involvement, and state management decisions with rationale. · Group discussion: instructor presents an evisceration scenario and an impaled object scenario; students debate correct management steps, and class reaches consensus guided by scope-of-practice references from the textbook.
Materials: Paramedic textbook, blank abdominal anatomy diagrams, printed case narratives, whiteboard, scope-of-practice reference cards
Check: Written exit ticket of 10 short-answer questions on organ injury patterns, assessment findings, and correct interventions; 80% pass mark; instructor provides written feedback on all incorrect responses.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

Airway, Respiration, and Ventilation / Trauma
1. Which of the following organs is located in the retroperitoneal space?
Trauma
2. A 28-year-old male was struck by a vehicle. He has a rigid, board-like abdomen, a heart rate of 128, blood pressure of 86/60 mmHg, and pale, diaphoretic skin. Which condition is most likely?
Trauma
3. You find a large knife impaled in the right upper quadrant of a patient's abdomen. The appropriate pre-hospital action is to:
Trauma
4. A patient has small bowel protruding from an abdominal stab wound. The correct management is to:
Trauma
5. Delayed bruising in the flanks (Grey Turner's sign) following blunt abdominal trauma most specifically suggests injury to:
Trauma
6. Which organ is most commonly injured in blunt abdominal trauma and poses the greatest immediate hemorrhagic risk due to its vascularity and size?
Trauma
7. A patient involved in a high-speed motor vehicle collision has a lap belt abrasion across the lower abdomen. Which injury pattern should the paramedic suspect?
Trauma
8. When managing a suspected pelvic fracture with signs of hemorrhagic shock, the paramedic should:
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