Download - Abdominal trauma
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Abdominal Trauma
By Beka Aberra
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Outline Introduction Background Anatomy Mechanisms and Pathophysiology Clinical assessment Conclusion
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INTRODUCTION Trauma is the commonest cause of death in
young people. ABDOMINAL TRAUMA STANDS THIRD NEXT
TO HEAD INJURY AND CHEST INJURY 25% of all major trauma victims require
abdominal exploration. Abdominal evaluation is the challenging
component of evaluating trauma. Penetrating torso injuries b/n nipple & perineum
is a potential intra abdominal injury. Mechanism, Force & Location of injury &
Hemodynamic status determine the priority & best method of assessment. 3
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75% OF ALL BLUNT TRAUMA TO ABDOMEN INVOLVES ROAD TRAFFIC ACCIDENT
60% OF INJURY OCCUR IN MALES (14-30)
Trauma related deaths form 3 Peaks– First Peak accounts 50% die instantly or
very soon.– Second Peak accounts 30% in hours of
injury due to severe blood loss.– Third Peak accounts 20% in days to
weeks due to infection/multi organ failure.
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Anterior abdomen Flank Back Intraperitoneal space contents Retroperitoneal space contents Pelvic cavity contents
Background Anatomy
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Anterior abdomen:
Trans-nipple line, Anterior axillary lines,
Inguinal ligaments and Symphysis pubis. Flank: Anterior and posterior axillary line;
Sixth intercostal to iliac crest.
Back: Posterior axillary line; Tip of scapula to
Iliac crest.
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Upper Peritoneal cavityCovered by lower aspect of bony thorax. Includes Diaphragm, Liver,
Spleen, Stomach, Transverse colon.
Lower Peritoneal cavity:Small bowel Ascending and Descending colon, Sigmoid colon
Retroperitoneal space: A Potential space Behind “true” abdominal cavity
Abdominal Aorta, Inferior vena cava, Parts of Duodenum, Pancreas,
kidneys, Ureters and posterior aspects of Ascending and Descending
colons
Pelvic cavity: Rectum, Bladder, iliac vessels and Internal genitalia in women.
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The Abdomen Everything between diaphragm and
pelvis Injuries very difficult to assess
because of large variety of structures
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Abdominal Anatomy Abdomen divided into four quadrants
by body mid-line, horizontal plane through umbilicus
Organ located by quadrant
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Abdominal Anatomy Right Upper Quadrant
– Liver– Gall Bladder – Right Kidney– Ascending Colon– Transverse Colon
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Abdominal Anatomy Left Upper Quadrant
– Spleen– Stomach– Pancreas– Left Kidney– Transverse Colon– Descending Colon
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Abdominal Anatomy Right Lower Quadrant
– Ascending Colon– Appendix– Right Ovary (female)– Right Fallopian Tube (female)
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Abdominal Anatomy Left Lower Quadrant
– Descending Colon– Sigmoid colon– Left Ovary (female)– Left Fallopian Tube (female)
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Abdominal Anatomy Organs can be classified as:
– Hollow– Solid– Major vascular
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Solid Organs Liver Spleen Kidney Pancreas
When solid organs are injured, they bleed heavily
and cause shock
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Hollow Organs Stomach Gall bladder Large, small intestines Ureters, urinary bladder
Rupture causes content spillage, inflammation of
peritoneum
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Major Vascular Structures Aorta Inferior vena cava Major branches
Injury can cause severe blood loss ; exsanguination
(bleeding out)
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Vascular Anatomy
1. Abdominal Aorta
2. Common Iliac Artery
3. Internal Iliac
4. External Iliac
5. Superior Gluteal
6. Obturator Artery
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Can you tell me What are the top 3 most commonly
injured organs in the abdomen?
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Spleen (40-55%)
Liver (35-45%)
Small bowel (5-10%)
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Mechanisms Blunt trauma:Motor Vehicle Accident
Seat belt injury Penetrating injuries:Stab wounds
Gun Shot wounds Blast
Bomb Crush
Building collapse Thermal
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Blunt Trauma
Motor vehicle collisions
Motorcycle collisions
Pedestrian injuries
Falls
Assault
Blast injuries
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Penetrating Trauma
Stab wounds
Gun Shot wounds
Surgical Incisions
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Blunt abdominal injuries carry a greater risk of morbidity and
mortality than penetrating abdominal injuries.
Mostly due to• Inadequate diagnosis• Delayed resuscitation• Delayed surgery
Blunt Abdominal trauma is the commonest cause of death in younger population with Polytrauma in RTA.
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Mechanism of Injury: Blunt
Motor Vehicle Accident
Seatbelt injury
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Pathophysiology 1.Compression/Concussive forces
– Direct blow
– External compression vs. fixed object (e.g. lap belt, spinal column)
Cause
• Tears & Sub capsular hematoma to solid viscera.
• Deform hollow organs & transiently Inc. intraluminal pressure.
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2. Deceleration forces– Stretching & Linear shearing b/n relatively fixed & free object.
In BAT, Organs that cant yield to impact by elastic deformation are most likely to be injured i.e. solid organs
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Rapid deceleration
Shearing Force created that cause solid, visceral organs and vascular pedicles to tear at relatively fixed points of attachment. Differential movements of fixed and non-fixed structures
(e.g. liver and spleen laceration at sites of supporting ligaments) Crushing effect
B/n anterior abdominal wall and vertebral column/posterior cage
(e.g. direct blow to the epigastrium with crushing of the pancreas over the spine)
Compressive effect
Sudden dramatic rise in Intra-abdominal pressure due to external compression, hollow viscus ruptures
(e.g. direct blow to liver or blowout of the bowel)27
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The most common cause of blunt trauma is the motor vehicle Injuries
Major global public health challenge but most of it occurs in low- and middle-income countries including Ethiopia.
Every year about 1.2 million people are killed and more than 20 million are injured or disabled
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Motor Vehicle Accidents
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Poor road network Absence of knowledge on road traffic safety Mixed traffic flow system Poor legislation and failure of enforcement Poor conditions of vehicles; Poor emergency medical services
Traffic accident compulsory insurance law is in effect Recently.
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Contributing Factors
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Seatbelt injuriesAlthough seatbelts reduce mortality overall, they cause a specific pattern of internal injuries.
Patients with seatbelt marks have been found to have a fourfold increase in thoracic trauma and an eightfold increase in intra-abdominal trauma compared with those without seatbelt marks
The three-point shoulder-lap belt is the most effective restraining system and is associated with the lowest incidence of abdominal injuries.
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Use of seatbelts is thought to reduce the risk of death or serious injury for front-seat occupants by approximately 45%.
Unbelted rear-seat occupants are also at increased risk of serious injury in motor vehicle accidents (MVAs); they may be ejected or thrown forward into the back of the front seat; the impact from unbelted rear-seat passengers on front-seat occupants can be a major determinant of injury.
It is estimated that, when rear seatbelts are worn, the risk of death for belted front-seat occupants is reduced by 80%.
In direct frontal MVAs, airbags provide a reduced risk of fatality of approximately 30%.
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Compression
Of the bowel between the belt and the vertebral column, an acute short closed-loop obstruction occurs along with perforation secondary to the sudden generation of high intraluminal pressures.
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Clinically, two symptom patterns emerge.
~1/4 of pt. develop evidence of a hemoperitoneum secondary to mesenteric lacerations.
In the remainder 3/4 of pt. the intestinal injury most commonly involves the jejunum contusion or perforation.
Rare cases of acute abdominal aortic dissection with incomplete or complete occlusion have also been described, and injuries to the lumbar spine are not uncommon.
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Mechanism of Injury: Penetrating
Kinetic Energy imparted to body
•Low velocity: Knife Ice pick
•Medium velocity: Gunshot wounds Shotgun wounds
•High velocity: High-power hunting rifles Military weapons
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Pathophysiology
Depends on the •Type of weapon•Velocity of bullet•Distance b/n assailant & victim
Typically follow the tract/trajectory of the inflicting instrument & thus involve contiguous structures.
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Stab Wounds Multiple in 20% of cases
Involve the chest in up to 10% of cases
Most stab wounds do not cause an intraperitoneal injury
The incidence varies with the direction of entry into the peritoneal cavity
The liver, followed by the small bowel, is the organ most often damaged by stab wounds.
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Knives are not the sole implement used in stabbings.
Ice picks, pens, coat hangers,
screwdrivers, and broken bottles.
Most commonly in the upper quadrants, the left more commonly than the right???
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Gunshot Wounds
Handguns, Rifles, and Shotguns
The degree of injury depends on Amount of kinetic energy imparted by the
bullet to the victim Mass of the bullet and the square of its
velocity Distance
“crush” Bones
“stretch” Tissues
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General Principles of GSW Low-velocity injury (<1000ft/sec), damage is
confined to missile tract. High-velocity injury (<2000ft/sec), blast effect
& cavitation occur in addition to damage by missile tract.
85% of ant. GSW violate the peritoneum; of these 95% require repair of intra abdominal injury.
Organs occupying the most space are more often injured
• Small bowel(29%)• Liver(28%) • Colon(23%)
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Type I wounds : long range (>7 yards) , a penetration of subcutaneous tissue and deep fascia only.
Type II wounds : distance of (3 to 7 yards) and may create a large number of perforated structures.
Type III wounds : occur at point-blank range (<3 yards) and involve a massive destruction of tissue
*1yard=0.9meter
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Small bowel injury is the most common injury resulting from ___ abdominal trauma.
penetrating blunt
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Small bowel injury is the most common injury resulting from ___ abdominal trauma.
penetrating blunt
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CLINICAL ASSESSMENT
HISTORY
PHYSICAL EXAMINATION
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Primary goal is to identify that an injury exists, not necessarily making an accurate diagnosis.
The patient's history may be unobtainable, elusive, or temporarily abandoned while resuscitative measures are carried out.
History from prehospital care team or transferring hospital : the vital signs, physical assessment, prehospital course, and response to therapy should be obtained
Mechanism of injury is an important factor in developing a high index of suspicion; thus a detailed history is helpful if available.
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Assessment: HistoryMechanismMVC:
Speed Type of collision (Frontal, Lateral,
Sideswipe, Rear, Rollover) Vehicle intrusion into passenger
compartment Types of restraints Deployment of air bag Patient's position in vehicle Kehr’s Sign???
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In blunt trauma: MVADetails about accidentFatality at the sceneVehicle type and velocityWhether the vehicle rolled overPatient's location within the vehicleExtent of intrusion into the passenger compartmentExtent of damage to the vehicleSteering wheel deformityWhether seat belts were used and, if so, what typeWhether front or side air bags were deployed
All patients involved in deceleration injuries and bicycle injuries should be suspected of having intraabdominal injury
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In penetrating trauma: GSW/MSW No. of shots or stabs? Type of weapon? Number of shots heard? Position of the patient when shot? Distance of the patient from the gun? What instrument was used? How long and how wide was the instrument? How was the patient positioned during the
stabbing? What path did the implement travel?
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Assessment: Physical Exam
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General Examination : Relating to hemodynamic stability (Vital Signs)Abdominal findings:• Inspection :
For abdominal distension For contusions or abrasionsLap belt ecchymosis
Mesenteric, Bowel, and Lumbar spine injuries Periumblical (Cullen sign) and
Flank (Grey Turner Sign) ecchymosis – Retroperitoneal
hematoma
PHYSICAL EXAMINATION
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• Palpation : For tenderness, guarding and/or rigidity, rebound tenderness – hemoperitoneum
• Percussion : Dullness/ shifting dullness Intraabdominal collection
• Auscultation : Where to auscultate & What to listen for??? All four quadrants for the +/- nce of bowel sounds
PHYSICAL EXAMINATION cont.
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The classical ‘seatbelt’ sign. The bruising on the left breast is from the shoulder belt and the low bruising to the abdominal wall is from the lap belt.
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Rectal findings Check for gross blood - Pelvic fracture Determine prostate position – High riding
prostate – Urethral injury Assess sphincter tone – Neurologic status Distal pulses- Assess for absence or asymmetryAssessment of other associated injuries i.e.
multiple fractures, spinal injuries etc.
PHYSICAL EXAMINATION cont..
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Left lower six ribs Right lower six ribs Upper Lumbar
vertebra Transverse Process
Pelvis
Spleen
Liver
Pancreas and Duodenum
Kidneys
Bladder
Urethra
Rectum 54
Associated with fractures
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Reliability of clinical evaluation
Low sensitivity Unreliable in 35/45% of pt. Why??
– Head Injury
– Spinal
– Alcohol
– Drug Repeated physical examination is
Mandatory.55
A missed abdominal injury can cause a preventable death.
Caution
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The major findings with injury of the solid abdominal organs are those of hemorrhagic shock. Signs with solid organ injury include all of the following EXCEPT:
abdominal pain and tenderness early bacterial peritonitis development of rebound, guarding and rigidity hypotension and tachycardia palpable mass and radiographic mass effect (may result from confined hemorrhage)
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The major findings with injury of the solid abdominal organs are those of hemorrhagic shock. Signs with solid organ injury include all of the following EXCEPT:
abdominal pain and tenderness early bacterial peritonitis development of rebound, guarding and rigidity hypotension and tachycardia palpable mass and radiographic mass effect (may result from confined hemorrhage)
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High Index of Suspicion Mechanism Tachycardia early, hypotension, and
pale, diaphoretic skin late Hypovolemic shock with no readily
identifiable cause Diffusely tender abdomen Pain in uninjured shoulder
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Blunt Abdominal Trauma Direct impact or
movement of organs Compressive, stretching
or shearing forces Solid Organs > Blood
Loss Hollow Organs > Blood
Loss and Peritoneal Contamination
Retroperitoneal > Often asymptomatic initially
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Blunt Abdominal Trauma Direct impact or
movement of organs Compressive, stretching
or shearing forces Solid Organs > Blood
Loss Hollow Organs > Blood
Loss and Peritoneal Contamination
Retroperitoneal > Often asymptomatic initially
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Blunt Abdominal Trauma Direct impact or
movement of organs Compressive, stretching
or shearing forces Solid Organs > Blood
Loss Hollow Organs > Blood
Loss and Peritoneal Contamination
Retroperitoneal > Often asymptomatic initially
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Blunt Abdominal Trauma Direct impact or
movement of organs Compressive, stretching
or shearing forces Solid Organs > Blood
Loss Hollow Organs > Blood
Loss and Peritoneal Contamination
Retroperitoneal > Often asymptomatic initially
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Blunt Abdominal Trauma Direct impact or
movement of organs Compressive, stretching
or shearing forces Solid Organs > Blood
Loss Hollow Organs > Blood
Loss and Peritoneal Contamination
Retroperitoneal > Often asymptomatic initially
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Conclusion Abdominal trauma is often difficult
to evaluate in the prehospital setting. Therefore the paramedic must exercise a high degree of suspicion based on the mechanism of injury and kinematics.
Death from abdominal injury usually results from hemorrhage and delayed surgical repair.
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The KEY to Saving Lives The abdomen is the “Black Box”
– i.e, its impossible to know what specific injuries have occurred at initial evaluation.
The Key to saving lives in abdominal trauma is NOT to make an accurate diagnosis, but rather to recognize that there is an abdominal injury.
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