Editor-In-Chief: C. Michael Gibson, M.S., M.D. ; Associate Editor(s)-in-Chief: Aravind Reddy Kothagadi M.B.B.S
The spleen is located in the upper left part of the abdomen (left-upper quadrant, left rib cage, or left flank). The spleen helps in filtering the blood and removes old and damaged blood cells and platelets. The spleen also helps the immune system in the destruction of bacteria and removal of foreign substances. In adults, the spleen is 250 grams in weight and measures 13 cm in length. It has been observed that the spleen involutes with the increasing age and it is less easily palpable in the adults when compared to children. The spleen, a highly vascular organ, is susceptible to bleeding from the arteries, veins or parenchyma in an event of injury to it. An injury to this organ can result in significant blood loss either from the parenchyma or the arteries and veins that supply the spleen. The spleen also serves as an important lymphopoietic organ. Normal functioning of the spleen plays a major role in the opsonization of encapsulated organisms. Functions of the spleen include hematologic functions such as the red cell maturation, phagocytosis, removal of particulates such as opsonized bacteria, or antibody-coated cells from blood and immunologic function which contributes to the humoral and cell-mediated immunity.
- American Association for the Surgery of Trauma (AAST) Spleen Trauma Classification: 
|American Association for the Surgery of Trauma (AAST) Spleen Trauma Classification|
|I||Hematoma||Subcapsular, < 10% surface area|
|Laceration||Capsular tear, < 1 cm parenchymal depth|
|II||Hematoma||Subcapsular, 10–50% surface area|
|Intraparenchymal, < 5 cm diameter|
|Laceration||1–3 cm parenchymal depth not involving a perenchymal vessel|
|III||Hematoma||Subcapsular, > 50% surface area or expanding|
|Ruptured subcapsular or parenchymal hematoma|
|Intraparenchymal hematoma > 5 cm|
|Laceration||> 3 cm parenchymal depth or involving trabecular vessels|
|IV||Laceration||Laceration of segmental or hilar vessels producing major devascularization (> 25% of spleen)|
|V||Laceration||Completely shatters spleen|
|Vascular||Hilar vascular injury which devascularized spleen|
- The spleen is located in the upper left part of the abdomen (left-upper quadrant, left rib cage, or left flank) which helps in filtering the blood and removes old and damaged blood cells and platelets. The spleen also helps the immune system in the destruction of bacteria and removal of foreign substances. In adults, the spleen weighs 250 grams and measures 13cm in length. It has been observed that the spleen involutes with the increasing age and is less easily palpable in the adults when compared to children.
- The spleen is a highly vascular organ making it susceptible to bleeding from the arteries, veins or parenchyma in an event of injury to it.
- The spleen also serves as an important lymphopoietic organ. Normal functioning of the spleen plays a major role in the opsonization of encapsulated organisms.
- Hematologic functions of the spleen include:
- Red cell maturation
- phagocytosis (extraction of abnormal cells)
- Opsonized bacteria, or antibody-coated cells from blood
- Immunologic function: Contributes to the humoral and cell-mediated immunity
- The spleen is injured in an event of trauma to the lower left chest or the upper left abdomen.  
- The nature of traumatic injury may be :
- Penetrating traumatic injury (e.g. abdominal gunshot wounds)
- Blunt traumatic injury (e.g. direct impact/blow to the left upper quadrant)
- Indirect traumatic injury (e.g. during colonoscopy, splenic capsule tear may occur or it may result in traction on the splenocolic ligament)
|Causes of Splenic Rupture|
|Traumatic causes||Non-Traumatic causes|
Differentiating Splenic rupture from other conditions
- Splenic rupture must be differentiated from other conditions such as infectious mononucleosis, fractured ribs, traumatic injury to the left kidney or the intestines and injuries to the surrounding musculoskeletal structures.
- Major risk factors for Splenic rupture include blunt or penetrating wounds as a result of contact sports and road accidents; colonoscopy procedures, hemolytic anemia, certain lymphomas and infectious mononucleosis.
- There is insufficient evidence to recommend routine screening for Splenic rupture.
Natural History, Complications, and Prognosis
- If left untreated, patients with splenic rupture may progress to develop fatal and life-threatening complications such as gross internal bleeding which may lead to coma.
- Complications of splenic rupture include, internal bleeding, splenic abscess, sepsis progressing to peritonitis, pancreatitis, necrosis and thrombocytosis (late complication)
- Prognosis is usually good after after surgical management. Patients undergoing splenectomy are more susceptible to infections from encapsulated organisms.
- Focused abdominal sonographic technique (FAST): FAST is a quick and safe procedure preferable in trauma patients to detect the presence of fluid in the peritoneal cavity.
- FAST is currently preferred over diagnostic peritoneal lavage (DPL) as it is non-invasive
- A diagnostic peritoneal lavage (DPL) helps in determining blood in the peritoneal cavity. It is considered to be quick and inexpensive but is not preferred when FAST is available.
History and Symptoms
- History of trauma to the left rib cage, left upper quadrant or left flank. Absence of injuries in these regions doesn't rule out the possibility of splenic injury.
- A previous surgical history of procedures such as splenectomy and a history of liver or portal venous disease should be evaluated. Medical history of use of aspirin or NSAIDs (nonsteroidal anti inflammatory drugs), anticoagulants, bleeding tendency and anticoagulants.
- A possible splenic rupture patient may or may not show tenderness, rigidity, or distention on arrival.
Symptoms of Splenic rupture include:
- Left upper quadrant abdominal pain
- Upper left abdominal tenderness
- Left shoulder pain (Sharp pain - Kehr's sign)
- Confusion, dizziness and lightheadedness
- Blurred vision
- Tachycardia ("racing heart" feel)
- Profuse sweating
- Extensive injury may result in excessive bleeding leading to hypotension and finally hypovolemic shock
- Abdomen (left-upper quadrant, left rib cage and left flank) is palpated to determine size of the spleen for abdominal tenderness.
- Evaluation for external signs of trauma such as abrasions, lacerations, contusions, and seatbelt sign.
- Patients with splenic injury may present with hypovolemic shock resulting in tachycardia and hypotension.
- Signs suggestive of probable splenic injury:
- Left upper quadrant tenderness
- Kehr's sign - Referred pain to the left shoulder
- Left lower rib fracture (below the 6th rib - in approximately one-fifth of patients)
- In an individual with stable vital signs and not in need of an emergency surgical intervention, a complete blood count (CBC) and hemoglobin (Hb) levels are measured in regular intervals in order to determine the amount of blood loss.
- There are no specific ECG findings associated with splenic rupture. However an ECG may be helpful in assessing the blood loss associated with splenic rupture. ECG findings are suggestive of sinus tachycardia.
- X-ray is not the preferred imaging modality in a case of splenic rupture.
Echocardiography or Ultrasound
- Focused abdominal sonographic technique (FAST): FAST is a quick and safe procedure preferable in trauma patients to detect the presence of fluid in the peritoneal cavity. Focused abdominal sonographic technique consists of examining four acoustic windows such as the pericardiac, perihepatic, perisplenic and pelvic regions during assessment.
- A contrast CT of the abdomen may be helpful in determining an "active bleed" in cases of ruptured spleen. A CT scan is not recommended in patients with unstable vital signs. 
- Abdominal MRI is considered in patients with kidney failure allergic to the contrast dye used in CT scan.
- WSES Spleen Trauma Classification for adult and pediatric patients:
|WSES Class||Mechanism of injury||AAST||Hemodynamic Status (a), (b)||CT scan||First-line treatment in adults||First-line treatment in pediatric|
|Minor||WSES I||Blunt/penetrating||I - II||Stable||Yes + local exploration in SW (d)||NOM (c) + serial clinical/laboratory/radiological evaluation
|NOM (c) + serial clinical/laboratory/radiological evaluation|
|Moderate||WSES II||Blunt/penetrating||III||Stable||Consider angiography/angioembolization|
|WSES III||Blunt/penetrating||IV - V||Stable||NOM (c) All angiography/angioembolization + serial clinical/laboratory/radiological evaluation|
|Severe||WSES IV||Blunt/penetrating||I - V||Unstable||No||OM||OM|
|SW - Stab wound; GSW - Gunshot wound; OM - Operative management; NOM - Non-Operative management
(a) Hemodynamic instability in adults is considered the condition in which the patient has an admission systolic blood pressure < 90 mmHg with evidence of skin vasoconstriction (cool, clammy, decreased capillary refill), altered level of consciousness and/or shortness of breath, or > 90 mmHg but requiring bolus infusions/transfusions and/or vasopressor drugs and/or admission base excess (BE) > − 5 mmol/l and/or shock index > 1 and/or transfusion requirement of at least 4–6 units of packed red blood cells within the first 24 h; moreover, transient responder patients (those showing an initial response to adequate fluid resuscitation, and then signs of ongoing loss and perfusion deficits) and more in general those responding to therapy but not amenable of sufficient stabilization to be undergone to interventional radiology treatments.
(b) Hemodynamic stability in pediatric patients is considered systolic blood pressure of 90 mmHg plus twice the child’s age in years (the lower limit is inferior to 70 mmHg plus twice the child’s age in years, or inferior to 50 mmHg in some studies). Stabilized or acceptable hemodynamic status is considered in children with a positive response to fluid resuscitation: 3 boluses of 20 mL/kg of crystalloid replacement should be administered before blood replacement; positive response can be indicated by the heart rate reduction, the sensorium clearing, the return of peripheral pulses and normal skin color, an increase in blood pressure and urinary output, and an increase in warmth of extremity. Clinical judgment is fundamental in evaluating children
(c) NOM should only be attempted in centers capable of a precise diagnosis of the severity of spleen injuries and capable of intensive management (close clinical observation and hemodynamic monitoring in a high dependency/intensive care environment, including serial clinical examination and laboratory assay, with immediate access to diagnostics, interventional radiology, and surgery and immediately available access to blood and blood products or alternatively in the presence of a rapid centralization system in those patients amenable to be transferred
(d) Wound exploration near the inferior costal margin should be avoided if not strictly necessary because of the high risk to damage the intercostal vessels.
- Surgical intervention is recommended as the first-line treatment option for the management of splenic rupture in patients with blunt trauma or penetrating injuries and those who are hemodynamically unstable, and associated complications such as peritonitis, bowel evisceration and other complications which require emergent surgical intervention. 
- Surgical intervention is also suggested for stable patients with moderate to severe lesions where intensive care and monitoring aren't avaialble and also where angiography and angioembolization aren't readily available.
- Splenectomy is recommended in cases where angiography and angioembolization procedures are unsuccessful and the patient is hemodynamically unstable (patients in whom the hematocrit levels are dropping and who require continuous transfusion). Salvage of a part of the spleen during surgical intervention isn't recommended remains debatable.
- Patients in early trauma and who are bleeding, laparoscopic splenectomy may not be recommended.
- Individuals with infectious mononucleosis are strictly recommended to refrain from contact sports or activities which may increase the risk for possibilities of splenic rupture until complete recovery.
- ↑ 1.0 1.1 1.2 1.3 Coccolini F, Montori G, Catena F, Kluger Y, Biffl W, Moore EE; et al. (2017). "Splenic trauma: WSES classification and guidelines for adult and pediatric patients". World J Emerg Surg. 12: 40. doi:10.1186/s13017-017-0151-4. PMC 5562999. PMID 28828034.
- ↑ Hildebrand DR, Ben-Sassi A, Ross NP, Macvicar R, Frizelle FA, Watson AJ (2014). "Modern management of splenic trauma". BMJ. 348: g1864. doi:10.1136/bmj.g1864. PMID 24696170.
- ↑ Aubrey-Bassler FK, Sowers N (2012). "613 cases of splenic rupture without risk factors or previously diagnosed disease: a systematic review". BMC Emerg Med. 12: 11. doi:10.1186/1471-227X-12-11. PMC 3532171. PMID 22889306.
- ↑ Jehangir A, Poudel DR, Masand-Rai A, Donato A (2016). "A systematic review of splenic injuries during colonoscopies: Evolving trends in presentation and management". Int J Surg. 33 Pt A: 55–9. doi:10.1016/j.ijsu.2016.07.067. PMID 27479605.
- ↑ Barone JE, Burns G, Svehlak SA, Tucker JB, Bell T, Korwin S; et al. (1999). "Management of blunt splenic trauma in patients older than 55 years. Southern Connecticut Regional Trauma Quality Assurance Committee". J Trauma. 46 (1): 87–90. PMID 9932688.
- ↑ Beuran M, Gheju I, Venter MD, Marian RC, Smarandache R (2012). "Non-operative management of splenic trauma". J Med Life. 5 (1): 47–58. PMC 3307080. PMID 22574087.
- ↑ Pachter HL, Guth AA, Hofstetter SR, Spencer FC (1998). "Changing patterns in the management of splenic trauma: the impact of nonoperative management". Ann Surg. 227 (5): 708–17, discussion 717-9. PMC 1191351. PMID 9605662.
- ↑ Cadeddu M, Garnett A, Al-Anezi K, Farrokhyar F (2006). "Management of spleen injuries in the adult trauma population: a ten-year experience". Can J Surg. 49 (6): 386–90. PMC 3207549. PMID 17234065.
- ↑ Nwomeh BC, Nadler EP, Meza MP, Bron K, Gaines BA, Ford HR (2004). "Contrast extravasation predicts the need for operative intervention in children with blunt splenic trauma". J Trauma. 56 (3): 537–41. PMID 15128124.
- ↑ Willmann JK, Roos JE, Platz A, Pfammatter T, Hilfiker PR, Marincek B; et al. (2002). "Multidetector CT: detection of active hemorrhage in patients with blunt abdominal trauma". AJR Am J Roentgenol. 179 (2): 437–44. doi:10.2214/ajr.179.2.1790437. PMID 12130447.
- ↑ Becker JA, Smith JA (2014). "Return to play after infectious mononucleosis". Sports Health. 6 (3): 232–8. doi:10.1177/1941738114521984. PMC 4000473. PMID 24790693.
Template:Injuries, other than fractures, dislocations, sprains and strains