Delayed traumatic splenic rupture complicated by supratherapeutic anticoagulation, mechanical cardiac valve prostheses, and complex red cell alloantibodies: a case report

Technical Summary: Delayed Traumatic Splenic Rupture with Complex Comorbidities

Problem Statement
The paper addresses a rare and high-mortality clinical scenario: the management of delayed traumatic splenic rupture (DSR) in a patient with a "perfect storm" of complicating factors. DSR is defined as hemorrhage occurring 48 hours or more post-injury, often following a silent latent period where a subcapsular hematoma expands until capsular failure. The specific challenge in this case report involves a 76-year-old male with mechanical aortic and mitral valve replacements requiring lifelong warfarin anticoagulation. The clinical paradox arises because the supratherapeutic anticoagulation (INR 7.3) necessitates urgent reversal for surgical hemostasis, yet this reversal simultaneously exposes the mechanical valves to catastrophic thrombosis. Furthermore, the patient possessed complex red cell alloantibodies acquired during prior cardiac surgery, rendering standard local cross-matching impossible and threatening to delay life-saving transfusion.

Methodology and Case Management
This is a retrospective case report detailing the clinical course of a single patient presenting to Wexford General Hospital. The methodology involves a multidisciplinary approach integrating emergency medicine, trauma surgery, anesthesiology, hematology, and critical care.

• Diagnosis: The patient presented 3–4 weeks after a fall with left-sided chest and shoulder pain (Kehr's sign), initially misattributed to cardiac pathology. Computed Tomography (CT) angiography confirmed a Grade III splenic rupture with a large-volume hemoperitoneum.
• Coagulation Management: To address the supratherapeutic INR of 7.3, the team administered intravenous Vitamin K (10 mg) followed by four-factor prothrombin complex concentrate (Octaplex, 2500 units). This reduced the INR from 7.3 to 1.9, allowing for emergency splenectomy.
• Transfusion Strategy: Due to complex alloantibodies preventing local cross-matching, the team utilized emergency O-negative packed red blood cells intraoperatively while the Irish Blood Transfusion Service (IBTS) performed urgent specialist processing. A total of 13 units of red cell concentrate were transfused throughout the admission (comprising pre-operative, intra-operative, and post-operative units).
• Surgical Intervention: An emergency splenectomy was performed. The patient required a second laparotomy the following day to ligate a spurting short gastric artery after persistent hemodynamic deterioration.
• Post-operative Anticoagulation: To balance the risk of valve thrombosis against surgical bleeding, a "no-bolus" unfractionated heparin infusion was initiated on post-operative day five, targeting a subtherapeutic activated partial thromboplastin time (aPTT) of 50–55 seconds, bridging to warfarin.
• Immunization: Given the splenectomy and prior rituximab therapy for Non-Hodgkin's Lymphoma, the patient received pneumococcal, Haemophilus influenzae type b, and Neisseria meningitidis vaccines prior to discharge.

Key Results

• Clinical Outcome: The patient survived the acute hemorrhagic event and the subsequent re-operation. He was extubated on day three, progressed to an oral diet by day nine, and was discharged home on day sixteen.
• Laboratory Trajectory: Hemoglobin dropped from 10.4 g/dL to 6.7 g/dL pre-operatively before stabilizing. The INR was successfully reversed to 1.9 prior to the first incision and normalized to 1.1 in the ICU. Acute kidney injury (creatinine 180 µmol/L) resolved conservatively by day six.
• Transfusion Efficiency: Despite the inability to cross-match locally, the protocol of using O-negative blood alongside specialist escalation allowed for continuous resuscitation without fatal delay.

Key Contributions and Claims
The authors claim this is the first published case describing the simultaneous management of three distinct, high-risk factors:

1. Delayed traumatic splenic rupture (with a notably long 3–4 week latent period).
2. Supratherapeutic anticoagulation in a patient with double mechanical valve replacement.
3. Complex red cell alloantibodies precluding local cross-matching.

The paper highlights that while DSR is a known diagnostic pitfall, the specific combination of supratherapeutic INR, mechanical valves, and alloantibody-mediated transfusion failure creates a unique clinical challenge. The authors note that previous literature has addressed DSR in anticoagulated patients or pseudoaneurysm ruptures, but none have combined these specific variables.

Significance and Limitations
The paper posits that this case offers critical lessons for perioperative and emergency medicine regarding the "clinical paradox" of reversing anticoagulation in mechanical valve patients.

• Diagnostic Lesson: Kehr's sign (referred shoulder pain) must not be dismissed as cardiac pain in patients with thoracoabdominal trauma, even in those with pre-existing cardiac disease and ECG changes.
• Therapeutic Lesson: Four-factor prothrombin complex concentrate is the evidence-based choice for urgent reversal in this context, superior to fresh frozen plasma. The "no-bolus" heparin bridge is presented as a viable strategy to protect mechanical valves without destabilizing surgical hemostasis.
• Transfusion Lesson: In the presence of complex alloantibodies, emergency O-negative blood is the correct immediate decision when hemorrhagic death is imminent, with specialist cross-matching running in parallel.
• Preventative Recommendation: The authors recommend routine pre-operative extended red cell antibody screening for patients undergoing valvular cardiac surgery to anticipate potential cross-matching failures.

The authors modestly acknowledge limitations, specifically the absence of point-of-care viscoelastic testing (which would have allowed more targeted resuscitation) and the fact that surgery commenced before a confirmed post-reversal INR was available (though the subsequent value of 1.9 validated the decision). They emphasize that the successful outcome relied on early multidisciplinary activation and rapid escalation to the blood transfusion service.