Spontaneous Intracerebral Hemorrhage in Pediatric Patients with Hemophilia A: Case Report and Review of Perioperative Management of Clotting Factor Concentrates

Citation: Akel O, Taylor B, Ashraf O, Jumah F, Raju B, et al. (2021) Spontaneous Intracerebral Hemorrhage in Pediatric Patients with Hemophilia A: Case Report and Review of Perioperative Management of Clotting Factor Concentrates. Neurosurg Cases Rev 4:081. doi.org/10.23937/26434474/1710081 Accepted: September 24, 2021; Published: September 26, 2021 Copyright: © 2021 Akel O, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Open Access Neurosurgery Cases and Reviews


Introduction
Hemophilia A (HA) is an X-linked recessive bleeding disorder that accounts for 80% of all hemophilia cases. ICH is the leading cause of death in patients with hemophilia and accounts for 20% of non-infectious deaths, as reported in countries with developed healthcare systems [1]. Neurosurgical intervention in the acute setting of intracranial hemorrhage in patients with HA is often reserved for those with a deteriorating neurological exam and/or clinically significant hemorrhage with mass effect. Beyond prompt surgical intervention, the perioperative management of HA is of paramount importance to optimize outcomes. Guidelines for perioperative management have attempted to address this yet practical challenges remain [2]. Here we discuss the case of a child with HA who required an urgent craniectomy for anon-a 5.6 × 3.7 cm acute intraparenchymal hematoma (IPH) centered on the right basal ganglia with associated 12 mm of leftward midline shift and right uncal herniation ( Figure  1). At this time, the patient was given 500 IU factor VIII (Advate), 10g mannitol (1 g/kg), and 200 mg levetiracetam (20 mg/kg). CT angiogram was negative for an underlying vascular malformation or aneurysm ( Figure 2). Given the significant midline shift as well as uncal and subfalcine herniation, the patient was taken to the operating room emergently for a right-sided decompressive hemicraniectomy and evacuation of the hematoma.

Operative Course
Intra-operatively, after removing the hemicraniectomy bone flap, diffuse bleeding from the skin, subcutaneous tissues, and bone was noted, at which point 500 IU of factor VIII were administered, with improvement in hemostasis. After opening the dura, a large subdural hematoma was evacuated, which was not seen on initial CT. Only evacuation of the liquid portion of the ICH was performed as most it was a hardened, densely organized hematoma. In addition, several sylvian fissure vessels were encountered within this hard organized hematoma, limiting the amount that could be evacuated. The portion of the hematoma that was densely adherent to the brain parenchyma was also left behind. Additional hemostasis was achieved with meticulous use of bipolar electrocautery, Gelfoam (Pfizer, New York, NY), thrombin, Surgicel (Johnson and Johnson, New Brunswick, NJ), and Surgiflo (Ethicon, Somerville, NJ). Estimated intraoperative blood loss was 200 ml, for which he received a total of 300 ml of normal saline, 300 ml of platelets, 130 ml of fresh frozen plasma, and 360 ml of pRBC. Postoperative hemoglobin was 10.1 g/dl.

Post-Operative Course
Postoperatively, the patient was taken to the traumatic ICH, and review the literature describing the challenges, nuances, and specific regimens of clotting factor replacements in neurosurgical patients with HA, and their respective outcomes.

Case Report/Case Presentation
A 9-month-old full-term African American male delivered via uncomplicated vaginal delivery with a known history of HA presented to the emergency department for fatigue and decreased oral intake. One week prior to admission, he had intermittent fevers with a maximum temperature of 39.4 °C (102.9 °F), and then developed fatigue and decreased feeding two days prior to presentation. On the day of admission, he began to experience right sided periorbital tenderness, worsened lethargy, and anorexia. The parents denied any recent trauma, although reported occasional bruising on the patient's lower extremities when crawling. The patient had no prior history of spontaneous bleeding secondary to HA and had never received a clotting factor treatment. He was not taking any medication.
On initial exam, the child was lethargic, protecting his airway, opening his eyes to stimulation, and moving all four extremities symmetrically. Pupils were equal and reactive to light bilaterally. He was found to be febrile to 38.2 °C (100.8 °F), and vital signs showed a heart rate (HR) of 115, blood pressure (BP) of 107/56, saturating at 100% on room air, and he weighed 9.4 Kg (62.5 th percentile). Laboratory studies revealed anemia (Hemoglobin of 6.3 g/dl). In the emergency department, the patient received 1 unit of packed red blood cells (pRBC), fluid resuscitation, acetaminophen for the fever, and broad-spectrum antibiotics for possible meningitis.
Given the history of HA, a computed tomography (CT) scan of the head was ordered, which demonstrated Factor VIII activity improved to 112% on repeat studies three hours later, it again decreased to 38% at 12 hours, for which he was given another bolus and the infusion rate was increased to 5 u/kg/hr. Follow up activity eight hours later was 115%.
To rule out an occult vascular lesion, he was then taken for a formal cerebral angiogram on postoperative day (POD) 1, which was negative ( Figure 4). Repeat Factor VIII activity approximately four hours later was 79%. At this point his Factor VIII levels continued to downtrend, with the lowest activity level on POD 2 being 15%. The decision was made to discontinue the infusion and begin a bolus regimen of 50 u/kg every six hours. Over the next two days, his Factor VIII levels continued to fluctuate with a predominantly upward pediatric intensive care unit, where he remained intubated, and was started on 3 u/kg/hr of factor VIII. On exam he was noted to be bradycardic, had no eye opening, and had left-sided hemiplegia. Pupils were 2 mm and reactive bilaterally, and the craniectomy site was soft and non-bulging. Postoperative CT head showed improved midline shift (12 to 8 mm, see Figure  3), although there was developing ventriculomegaly and loss of gray-white differentiation, suggestive of diffuse cerebral edema. Medical treatment was optimized with mannitol boluses and a 3% NaCl drip, maintaining sodium in the 150-155 mEq/L range.
A postoperative coagulation profile demonstrated a low Factor VIII coagulation activity of 30%, for which he was given another bolus of 500 IU of Factor VIII, and his infusion rate was increased to 4 u/kg/hr. Although   of the right middle cerebral artery (MCA) territory ( Figure 5), gray-white matter differentiation was largely preserved. He demonstrated neurological improvement over the following two weeks; on POD 9, the patient was successfully extubated, and he was awake and alert, opening eyes spontaneously, tracking, and moving all trend, reaching a maximum of 254% after a 500 IU bolus on POD 5. Over the following week, his Factor VIII dosing continued to be titrated; ultimately, he was continued on 250 IU every six hours.
Although an MRI on POD 2 demonstrated ischemia review the literature, and propose a solution to patients with inadequate response to continuous infusions (CI) of factor VIII.
The incidence of ICH is 20 to 50 times greater among patients with hemophilia than those without the condition [3], and most frequently occurs in children with severe forms of the disease in the first two years of life, particularly if they are not receiving clotting factor prophylaxis [1,4]. This presents unique challenges in the emergent neurosurgical setting. Given that the prevalence of severe Hemophilia A is reported to be 6 per 100,000 in males and ICH affects 3-10% of them, resulting in a mortality rate of up to 20%, evaluation of nuances in neurosurgical perioperative management is paramount to improving outcomes [3,5,6].
Current world federation of hemophilia (WFH) guidelines recommend that if there is any external evidence of head trauma or clinical suspicion of intracranial hemorrhage in this population, immediate treatment with clotting factor concentrate (CFC) should be administered prior to, and without waiting for, results of further radiographic or laboratory tests [2]. The appropriate dosing in the acute setting of intracranial hemorrhage is subject to the target factor VIII activity level which has been conventionally defined as 80-100 IU/dL (80-100%) for ICH [2,3,[7][8][9][10][11]. Achieving the appropriate plasma activity level can be accomplished by administering 1 IU/kg of either recombinant or plasma derived factor VIII for every 2 IU/dL (2%) increase in activity level desired [9,12]. This calculation assumes the absences of inhibitors, which may develop with chronic treatment, and is dependent on individual factors such as body mass index (BMI) [13]. Therefore, a dose of 50 four extremities with greater activity on the right side than the left.
A cranioplasty was performed on POD 14, as the flap was sufficiently soft. Preoperatively he was bolused 500 IU of Factor VIII and continued on 500 IU every six hours. The following day his Factor VIII activity level was found to be 323%, and his dose was adjusted back to 250 IU every six hours. There was no evidence of active bleeding or extravasation from the wound site, and the dressing was removed on POD 2. There were no further complications after the cranioplasty ( Figure  6), or deterioration in neurological status. Figure 7 summarizes clotting factor concentrate administered in the perioperative period.
The patient was discharged to a specialized pediatric rehabilitation center for physical and occupational therapy on postoperative day 33 following the initial surgery. At the time of discharge, he was noted to be awake, alert, sitting up in bed, smiling, playful, and moving all four extremities symmetrically. Given his spontaneous hemorrhagic episode, a Permacath was placed during this hospitalization for lifelong factor VIII therapy. Ultimately the patient was discharged with a nasogastric tube, levetiracetam 40 mg/kg/day BID, and recombinant factor VIII 500 IU BID.

Discussion/Conclusion
ICH in a child with Hemophilia A is a neurosurgical emergency that requires special considerations and a multidisciplinary approach. We describe our institutional experience with and nuances of treating an infant with severe HA who presented with spontaneous ICH, discuss perioperative factor VIII management,   Continuous infusions have several advantages over boluses, including avoidance of often unpredictable peaks and troughs, and more economical use of Factor VIII, as higher plasma activity levels may often be achieved with less factor product [23]. However, clinically sufficient factor VIII activity may be related to variations in its clearance from the plasma, which prior authors have suggested may increase immediately after surgery and with extensive blood loss [2,12]. These perioperative fluctuations in the rate of Factor VIII degradation pose a challenge to appropriately titrating continuous infusions, at a time when effective hemostasis is needed most. In our patient, the continuous infusions did not maintain reliable and adequate factor activity levels in the perioperative period, and as a result we opted for a regimented bolus schedule titrated to our target levels with supplemental infusions prior to invasive procedures. Specifically, with a target activity level of 100%, we bolused recombinant factor VIII at a dose of 50 IU/kg prior to the cerebral angiogram and cranioplasty, which proceeded without significant hemorrhagic complications. In effect, utilizing a bolus regimen, and periodically checking factor VIII levels, may be ideal perioperatively for HA patients who require immediate neurosurgical evacuation of an intracranial hematoma.
Two major factors that should be considered in addition to the administration regimen are the half-life of Factor VIII and the potential for formation of antifactor VIII antibodies. The half-life of standard half-life (SHL) recombinant Factor VIII such as Advate (Takeda; Tokyo, Japan) used at our institution is approximately 8-12 hours. The extended half-life (EHL) products alternatively have half-lives of approximately 12-19 hours; however, the half-life may vary with age and typically the half-life extension is minimal in children [2]. The formations of antibodies against factor VIII have been shown to be a challenge when treating HA patients with factor VIII. The incidence of inhibitor development is up to 41% in those treated within the first month of life, but the risk decreases to 18% in those treated after 18 months [24]. Additionally, the risk of inhibitor development is significantly higher in patients with severe HA (12-13% compared to 5-7% seen in hemophiliacs overall) [25]. Risk factors for forming anti-Factor VIII antibodies include patients who are previously untreated, intense early treatment, higher dosage, and treatment for surgical procedures [24]. Hemophilia A patients who develop inhibitors generally do so within the first 40 days after exposure to Factor VIII, with a median onset of 14 days in the pediatric population [24,25]. In the case we presented, there was no concern that our patient's lack of response to continuous infusions was due to an inhibitor. This is due to the fact that this was his first treatment with IU/kg in the setting of intracranial hemorrhage would be expected to achieve a factor VIII activity level of 100% [14].
Previous reports that document neurosurgical interventions in HA patients are variable in their approach to correcting the coagulopathy. Historically, attempts to correct the clotting factor deficiencies in the setting of ICH with fresh blood and/or fresh plasma resulted in the death of upwards of two thirds of patients [15]. To avoid hypervolemia and brain edema, Carrea, et al. developed FIOta (tannic acid precipitate of Blombäck's FI-O fraction), a factor VIII preparation ten times more concentrated than human plasma [15]. Cryoprecipitate later emerged as the mainstay of treatment, demonstrating efficacy in elevating Factor VIII activity levels perioperatively for neurosurgical intervention in ICH with safe evacuation of hematomas [16,17]. Cryoprecipitate, however, had varying levels of Factor VIII depending on its preparation [16].
With the introduction of CFCs, much of the guidance is aimed at reaching and maintaining an appropriate factor VIII concentration level but there is no clear consensus on the optimal methodology to achieve this in the emergent perioperative setting. In our literature review, there were eight reports (and a total of 17 patients) that detailed perioperative regimens among non-traumatic pediatric HA patients with ICH (Table 1) [7,10,11,[18][19][20][21][22]. Overall, management has largely been a combination of continuous infusions, boluses, and/or a defined infusion interval. Four of the eight reports (50%) clearly reported a bolus of Factor VIII on presentation [10,[18][19][20]. Following the initial intervention, three (37.5%) studies transitioned to a continuous infusion of factor VIII and corticosteroids [10,19,20]. Two reported their hourly infusion rate [10,20], the third reported a daily rate [19]. Five studies (62.5%) utilized a scheduled regimen consisting of either a bolus or infusion at defined intervals [7,11,18,21,22]. One case was transitioned from a continuous infusion on postoperative day 7 to a bolus schedule for four weeks [20]. Titration strategies of Factor VIII and duration of treatment varied significantly between studies, however all patients included in the analysis survived to discharge. One patient developed inhibitors to Factor VIII after 10 days of treatment and was transitioned to activated factor VII (rFVIIa; NovoSeven) [10].
During the care of our patient, a bolus of 50 IU/kg of Factor VIII was given empirically in the emergency room pre-operatively. Intra-operatively, since the patient continued to have diffuse extravasation, another 50 IU/ kg bolus was given. Post-operatively, titrating up to 5 u/kg/hr of factor VIII remained inadequate and often required intermittent boluses of factor VIII to maintain a target activity level of > 80%. In coordination with the pediatric hematology team, we opted to discontinue continuous infusions and begin a scheduled bolus Bergin

Conclusion
Spontaneous intracranial hemorrhage is a morbid and potentially fatal sequela of Hemophilia A and requires a heightened level of suspicion in children less than two years of age who present with altered sensorium. Immediate correction of clotting factor deficiency is paramount prior to neurological surgery and in the immediate post-operative period. In our experience, inadequate response to a continuous infusion of clotting factor concentrate can be corrected with a regimented bolus schedule titrated to 80-100% factor VIII activity levels; additionally, 50 IU/kg given prior to additional invasive procedures was effective in achieving adequate hemostasis intra-operatively.