INTRODUCTION

Complete blood count abnormalities are often present in severely injured patients [1]. Additionally, coagulation defects associated with severe trauma, referred to as trauma-induced coagulopathy, are caused by factors that affect the hematopoietic system and coagulation mechanisms, including massive blood loss, as well as dilutional coagulopathy after transfusion and fluid infusion [1-3]. However, it is difficult to distinguish between hematologic abnormalities associated with trauma and other hematologic disorders because both categories of conditions show similar hematologic abnormalities, and the ability to take a past medical history is limited in trauma patients.

As undiagnosed hematologic disorders in trauma patients could lead to delays in the correct diagnosis and improper treatment, physicians at a trauma center should always consider the possibility of other chronic diseases when encountering atypical and prolonged hematologic dysfunction. We report two rare cases of hematologic diseases diagnosed in patients with serious trauma: systemic lupus erythematosus (SLE)-induced autoimmune hemolytic anemia (AIHA) and myelodysplastic syndrome (MDS).

CASE REPORT

Case 1

A 27-year-old male patient with no past medical history was transferred to Yonsei University Wonju Severance Christian Hospital with an upper abdominal stab wound inflicted during a quarrel. At admission, his blood pressure (BP) was 107/64 mmHg, his heart rate (HR) was 70 beats/min, his body temperature (BT) was 34.4°C, and he was in a stupor. The stab wound measured approximately 4 cm and a large amount of blood was found in the wound (Table 1). The initial hemoglobin (Hb) level was 7.9 g/dL (normal range, 13.5–17.0 g/dL), the prothrombin time was 13.6 s (normal range, 10.6–13.1 s), the activated partial thromboplastin time was 33.2 s (normal range, 23.6–30.9 s), the fibrinogen level was 195 mg/dL (normal range, 200–400 mg/dL), and the lactate dehydrogenase (LDH) level was 169 U/L (normal range, <280 U/L). Fifteen minutes after the patient arrived at Yonsei University Wonju Severance Christian Hospital, he was taken to the operating room and underwent exploratory laparotomy. The surgical findings revealed a liver laceration in segment 3 with hemoperitoneum and a serosal tear of the jejunum. Bleeder ligation of the liver and serosal repair of the jejunum were performed, after which two Jackson-Pratt drains were placed in the abdominal cavity. During the operation, two packs of red blood cells (RBCs) and two packs of fresh frozen plasma were transfused and 6 L of crystalloid fluid was infused. The patient received ABO-compatible transfusions and the antibody screening test was negative.

After the operation, the Hb level remained near 9.0 g/dL until postoperative day (POD) 10, but suddenly decreased to 6.6 g/dL. The haptoglobin level also decreased to 2 mg/dL (normal range, 26–185 mg/dL), whereas the white blood cell (WBC) count increased to 26.05×10⁹/L (normal range, [4–9]×10⁹/L), the platelet (PLT) count increased to 837×10⁹/L (normal range, [165–360]×10⁹/L) (Fig. 1A), and the LDH level to 1,954 U/L. The creatinine level remained within the normal range (<1.4 mg/dL) until POD 9, but suddenly increased to 1.97 mg/dL. No active hemorrhage was found in the drain or on abdominal computed tomography (CT). Hemolytic anemia was suspected because the patient’s hemolytic score [4] was 6, the hemolysis index [5] was 4, and hyperbilirubinemia was observed starting on POD 9. The patient was positive for direct antiglobulin immunoglobulin G (IgG). The osmotic fragility of RBCs was increased, the immature reticulocyte fraction was 42.44% (normal range, 2–13%), the reticulocyte fraction was 8.13% (normal range, 0.5–1.5%), and the reticulocyte hemoglobin content was 30.9 pg (normal range, 25–30 pg) [6]. On the basis of these findings, we diagnosed AIHA and conducted additional complement and antibody tests to evaluate the reason for AIHA. Anti-Smith antibody, anti-ribonucleoprotein antibody, anti-nuclear antibody, and anti-cardiolipin IgG were positive. Finally, under the diagnosis of AIHA with SLE according to the 2019 European League Against Rheumatism and American College of Rheumatology (EULAR/ACR) classification criteria (Table 2), 0.5 mg/kg of prednisolone was maintained for 11 days, and the patient was discharged with a Hb level of 11.6 g/dL.

Case 2

A 62-year-old male patient with no past medical history was transferred to Yonsei University Wonju Severance Christian Hospital. The patient was traumatized while his head was sucked in a conveyor belt while working at a nearby factory. His BP was 124/82 mmHg, his HR was 64 beats/min, and his BT was 34.9°C. He was semicomatose upon arrival (Table 1) and diffuse axonal injury was suspected based on brain CT. On abdominopelvic CT, a grade II liver laceration was observed in segments 4 and 5, and blunt trauma of the duodenum was suspected (Fig. 2). In addition, chest CT showed fractures of the left second to eighth ribs and the left scapula, as well scant hemothorax in the left thoracic cavity. The patient was admitted to the intensive care unit following intubation, and angiography of the superior mesenteric artery and celiac trunk was performed to check for additional intraperitoneal bleeding. Additionally, esophagogastroduodenoscopy was performed to confirm the presence or absence of a duodenal injury. No abnormalities were found on either test and he received conservative treatment. At the time of admission, his WBC count was 4.19×10⁹/L, his RBC count was 2.66×10¹²/L (normal range, [4.2–5.7]×10¹²/L), and his PLT count was 46×10⁹/L. The absolute reticulocyte count (ARC) was 100.6×10⁹/L (normal range, [29–69]×10⁹/L). Pancytopenia persisted after hospitalization and did not improve following repeated transfusions (Fig. 1B). To identify internal bleeding, abdominal and chest CT were performed on hospital day (HD) 8, but there was no bleeding focus. The WBC count was within the normal range on most days during hospitalization (Fig. 1B). However, since the patient was hospitalized with injuries involving multiple body regions, a fever persisted, and the delta neutrophil index was consistently high, the WBC count was considered to be lower than expected. A peripheral blood smear, serum chemistry tests, autoimmune antibody testing, and viral markers also showed no abnormal findings other than pancytopenia. Therefore, we performed a bone marrow biopsy to make an accurate diagnosis on HD 19, and MDS was eventually diagnosed (Fig. 3A). The karyotype of the patient was 47, XY+1, t(1;8)(q10;q10), der(1;8) (q10;q10) (Fig. 3B), the International Scoring System for Evaluating Prognosis in Myelodysplastic Syndromes score was 1.5 (intermediate-2 risk), and his score using the World Health Organization classification-based prognostic scoring system was 3 (high risk) [4,7]. After conservative treatment for trauma was completed, the patient was transferred to another hospital on HD 48 according to his wishes.

DISCUSSION

Coagulopathy and abnormal increases or decreases in cell counts are common in trauma patients [8]. Severe trauma is implicated in bone marrow dysfunction in many cases [9]. Although hematologic abnormalities are related to poor outcomes [10], many physicians at trauma centers rarely consider the possibility of other diseases that can cause hematologic abnormalities in trauma patients with cytopenia or coagulopathy. It is difficult to suspect the possibility of hematologic diseases in the early stage of severe trauma, because most patients are hemodynamically unstable and have coagulopathy. Moreover, the association between hematologic diseases and trauma is not fully understood. Underlying hematologic disorders are usually diagnosed if the laboratory findings are constantly abnormal after a patient stabilizes and there is no obvious bleeding on imaging tests.

In this patient with AIHA, although there was no active bleeding and the patient was in a stable condition, his anemia suddenly worsened on HD 9. We suspected the possibility of hemolysis based on a high hemolytic score and hemolysis index [4,5], an increased LDH level, and a decreased haptoglobin level. We diagnosed AIHA based on aforementioned findings, a positive direct antiglobulin test, and reticulocytosis. SLE was not considered at first, because the patient did not complain of the typical symptoms of SLE and he presented with leukocytosis and thrombocytosis. However, the antinuclear antibody titer was above 1:80 and the EULAR/ACR score exceeded 10; therefore, despite the patient’s lack of clinical symptoms, SLE was diagnosed [11].

MDS is characterized by ineffective hematopoiesis, which in turn results in peripheral blood cytopenia and bone marrow dysplasia. The normal response to anemia, such as an increase in the production of reticulocytes, is poor in patients with MDS. To identify the causes of pancytopenia, drugs that could cause cytopenia were discontinued, and diseases such as sepsis were excluded. However, unexplained pancytopenia persisted for more than 2 weeks, and the patient underwent bone marrow biopsy [12,13]. The reason for the increase in ARC even though the patient’s underlying disease was MDS was hematopoietic pumping caused by traumatic hemorrhage [14].

Diverse factors lead to delays in the correct diagnosis of underlying hematologic diseases in the early phase of trauma. Therefore, physicians at trauma centers should be familiar with the clinical characteristics of hematologic diseases and take into account the possibility of these diseases in trauma patients to reduce unnecessary treatment and to improve patients’ outcomes.

Fig. 1.

Changes in laboratory findings over time in (A) case 1 and (B) case 2. The normal range is indicated by the gray square. A*: admission day, aPTT: activated partial thromboplastin time, INR: international normalized ratio, Hb: hemoglobin, WBC: white blood cell, PLT: platelet, PT: prothrombin time.

Fig. 2.

(A, B) Grade II liver laceration in liver segments 4 and 5, (C) thickened duodenal wall, reflecting a duodenal blunt injury.

Fig. 3.

(A) Representative image of bone marrow biopsy. The arrow indicates a blast cell. (B) Karyotype of bone marrow cells showing 47, XY+1, t(1;8) (q10;q10), der(1;8)(q10;q10). Arrows indicate chromosomal abnormalities.

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References

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