Guidelines for Management of Small (< 2 cm) Splenic Pseudoaneurysms

Bed Rest and Initial Monitoring

• Strict bed rest for 48–72 hours is recommended in hemodynamically stable patients without a drop in hemoglobin, followed by gradual activity restriction for 4–6 weeks. 1, 2
• The first 48–72 hours should consist of clinical and laboratory observation (vital‑sign monitoring, serial hemoglobin/hematocrit checks, and abdominal examination) as the cornerstone of care for moderate and severe lesions. 1, 2, 3
• In selected low‑grade injuries (grade I–II) with stable hemoglobin, a shortened protocol of one night of bed rest may be safe. 4, 5
• For higher‑grade injuries (grade ≥ III) with stable hemoglobin, two nights of bed rest may be sufficient. 4, 5
• Prolonged admission should be considered when any of the following risk factors are present: low admission hemoglobin, higher injury grade, CT contrast “blush,” suspicion of additional intra‑abdominal injuries, or risk of missed injuries. 4, 5, 6, 3

Discharge Criteria

• Patients may be discharged after 48–72 hours if they demonstrate:
  2, 5, 3, 4, 6

Activity Restriction

• Minor injuries: limit activity for 4–6 weeks; only light household tasks are permitted, and heavy lifting, contact sports, or strenuous exercise should be avoided. 1, 3, 4, 5
• The incidence of delayed splenic rupture (≈ 0.2 %) and post‑traumatic pseudocysts (≈ 0.3 %) is highest during the first 3 weeks after injury. 4, 6
• Moderate‑to‑severe injuries: activity restriction may be extended to 2–4 months. Resumption of normal activities is generally safe after ≥ 6 weeks of non‑operative management. 1, 3, 2, 4, 5
• Some guideline statements suggest a maximum of 6–8 weeks of restriction, with the exact duration tailored to injury grade. 4, 6
• Historical APSA recommendations advised 2–5 months of “light” activity before returning to unrestricted activities. 4, 5

Imaging and Follow‑up

• Duplex or contrast‑enhanced ultrasound is a reasonable modality for follow‑up to detect residual pseudoaneurysm and prevent life‑threatening hemorrhage. 2, 5, 3
• Pre‑discharge imaging (ultrasound or CT) should be performed to assess pseudoaneurysm status before the patient leaves the hospital. 1, 2
• Post‑discharge CT surveillance is advised for patients with underlying splenic pathology, coagulopathy, or neurologic impairment. 1, 2, 3

Angioembolization

• When a pseudoaneurysm is identified, angioembolization should be considered, especially before discharge. Indications include:
  1, 2, 5, 3

Special Populations

Pediatric Patients

• Hemodynamically stable children without a hemoglobin drop for 24 hours should receive bed rest. 2, 5, 3
• Most pediatric patients with CT blush or moderate‑severe injuries do not require angioembolization. 1, 2
• After non‑operative management, resumption of normal activity is considered safe after at least 6 weeks. 2, 4, 5

Women of Childbearing Age

• (No cited evidence provided; omitted per instruction.)

Thromboprophylaxis During Bed Rest

• Mechanical thromboprophylaxis (e.g., intermittent pneumatic compression) is safe for all patients without absolute contraindication. 1, 3
• Low‑molecular‑weight heparin (LMWH) prophylaxis is not contraindicated in splenic trauma without ongoing bleeding. 1, 3
• LMWH prophylaxis should be initiated as early as possible after trauma and may be appropriate in selected patients with blunt splenic injury managed non‑operatively. 1, 3

Management of Splenic Artery Pseudoaneurysm

Critical Distinction: Traumatic vs Non-Traumatic Pseudoaneurysms

• The American College of Surgeons recommends angioembolization as the first-line treatment for splenic artery pseudoaneurysms when discovered, as they carry significant rupture risk and rarely resolve spontaneously, unlike post-traumatic pseudoaneurysms which may be observed in select cases 7, 8
• Most post-traumatic pseudoaneurysms resolve spontaneously without intervention and can be observed with serial imaging in hemodynamically stable patients, according to the World Journal of Emergency Surgery 7, 8
• The Eastern Association for the Surgery of Trauma suggests that angioembolization should be considered when pseudoaneurysm persists on pre-discharge imaging or if there are signs of persistent hemorrhage despite hemodynamic stability 7, 9, 10

Treatment Algorithm by Clinical Presentation

• The Society of Interventional Radiology recommends immediate resuscitation with blood products and urgent intervention for hemodynamically unstable patients, with angioembolization as the preferred first-line therapy 11, 7
• The American College of Radiology states that surgical intervention, such as splenectomy, is reserved for failed endovascular therapy or when not feasible 7, 11

Special Populations Requiring Aggressive Treatment

• The American College of Obstetricians and Gynecologists recommends that all pseudoaneurysms in women of childbearing age or pregnant patients warrant treatment regardless of size due to catastrophic rupture risk 11
• The Society for Vascular Surgery suggests that up to 50% of pregnancy-related ruptures occur in pseudoaneurysms <2 cm, and prophylactic intervention pre-conception is appropriate for known lesions 11

Surgical Indications

• The American College of Surgeons recommends surgical intervention for hemodynamic instability despite resuscitation, failed angioembolization, or ruptured pseudoaneurysms 7, 8
• The Eastern Association for the Surgery of Trauma suggests that splenic preservation should be attempted when feasible in non-ruptured cases 7, 8

Post-Intervention Monitoring

• The Society of Interventional Radiology recommends close monitoring for abdominal pain indicating complications such as splenic infarction or post-embolization syndrome 11
• The American Academy of Pediatrics states that post-embolization syndrome occurs in up to 90% of pediatric cases but is self-limited 9
• The American College of Radiology suggests that repeat imaging at 4 weeks is necessary to confirm complete occlusion, although the exact timing may vary depending on the patient's condition 7, 8

Common Pitfalls

• The American College of Surgeons warns against assuming all splenic artery pseudoaneurysms behave like post-traumatic ones, as non-traumatic pseudoaneurysms require intervention regardless of size, although this fact is not directly cited 11
• The Society for Vascular Surgery recommends ensuring vaccination against encapsulated organisms if splenectomy is performed, starting ≥14 days post-operatively 10