Prothrombin Complex Concentrate for Warfarin-Associated Intracranial Bleeding in Neurosurgical Patients: A Single-Center Experience

Factors contributing to poor outcome in patients on warfarin receiving 4-factor prothrombin complex concentrate in critically ill

AIM

To compare the demographical profile, indications, efficacy, and contributors to adverse outcome following administration of 4F-PCC in patients on warfarin with supratherapeutic INR.

METHODOLOGY

Retrospective cross-sectional study was performed in a community based teaching hospital. All patients 18 years and older on warfarin with supratherapeutic INR, who had received 4F-PCC between January 2014 and December 2018 were eligible and included in the study.

RESULTS

44 patients were included in the analysis. The mean age of the patients was 79.5 years. The male to female ratio was 1:1. Patients were on warfarin for atrial fibrillation, thromboembolism in 79.5% (N-35), and 20.5% (N-9) respectively. Indications for use of 4F-PCC were active bleeding in 93% (N-41) of patients. The common sites of bleeding were gastrointestinal, intracranial, and musculoskeletal which were seen in 54.5% (N-24), 29.5% (N-13) and 6.8% (N-3) respectively. The median number of doses of 4F-PCC administered was 1 per patient. The mean dose administered was 2,883u. Clinical improvement was documented in 84% (N-37) of patients. Mortality was seen in 16% (N-7) of patients. BMI greater than 30, anemia, hypotension, presence of intracranial bleed, the requirement of blood products, and mechanical ventilation were associated with higher odds for mortality. Hypotension and requirement of mechanical ventilation were statistically significant.

CONCLUSION

4F-PCC continues to be an effective agent in the rapid reversal of warfarin therapy in patients with supratherapeutic INR presenting with major bleeding events. Most patients have clinical improvement with a single, weight-adjusted dose.

Clinical protocols for oral anticoagulant reversal during high risk of bleeding for emergency surgical and nonsurgical settings: a narrative review

Background and objectives

Oral anticoagulants prevent thromboembolic events but expose patients to a significant risk of bleeding due to the treatment itself, after trauma, or during surgery. Any physician working in the emergency department or involved in the perioperative care of a patient should be aware of the best reversal approach according to the type of drug and the patient’s clinical condition. This paper presents a concise review and proposes clinical protocols for the reversal of oral anticoagulants in emergency settings, such as bleeding or surgery.

Contents

The authors searched for relevant studies in PubMed, LILACS, and the Cochrane Library database and identified 82 articles published up to September 2020 to generate a review and algorithms as clinical protocols for practical use. Hemodynamic status and the implementation of general supportive measures should be the first approach under emergency conditions. The drug type, dose, time of last intake, and laboratory evaluations of anticoagulant activity and renal function provide an estimation of drug clearance and should be taken into consideration. The reversal agents for vitamin K antagonists are 4-factor prothrombin complex concentrate and vitamin K, followed by fresh frozen plasma as a second-line treatment. Direct oral anticoagulants have specific reversal agents, such as andexanet alfa and idarucizumab, but are not widely available. Another possibility in this situation, but with less evidence, is prothrombin complex concentrates.

Conclusion

The present algorithms propose a tool to help healthcare providers in the best decision making for patients under emergency conditions.

Safety and efficacy of prothrombin complex concentrate (PCC) for anticoagulation reversal in patients undergoing urgent neurosurgical procedures: a systematic review and metaanalysis

Anticoagulant therapy poses a significant risk for patients undergoing emergency neurosurgery procedures, necessitating reversal with prothrombin complex concentrate (PCC) or fresh frozen plasma (FFP). Data on PCC efficacy lack consistency in this setting. This systematic review and metaanalysis aimed to evaluate efficacy and safety of PCC for anticoagulation reversal in the context of urgent neurosurgery. Articles from PubMed, Embase, and Cochrane databases were screened according to the PRISMA checklist. Adult patients receiving anticoagulation reversal with PCC for emergency neurosurgical procedures were included. When available, patients who received FFP were included as a comparison group. Pooled estimates of observational studies were calculated for efficacy and safety outcomes via random-effects modeling. Initial search returned 4505 articles, of which 15 studies met the inclusion criteria. Anticoagulants used included warfarin (83%), rivaroxaban (6.8%), phenprocoumon (6.1%), apixaban (2.2%), and dabigatran (1.5%). The mean International Normalized Ratio (INR) prePCC administration ranged from 2.3 to 11.7, while postPCC administration from 1.1 to 1.4. All-cause mortality at 30 days was 27% (95%CI 21, 34%; I² = 44.6%; p-heterogeneity = 0.03) and incidence of thromboembolic events was 6.00% among patients treated with PCC (95%CI 4.00, 10.0%; I² = 0%; p-heterogeneity = 0.83). Results comparing PCC and FFP demonstrated no statistically significant differences in INR reversal, mortality, or incidence of thromboembolic events. This metaanalysis demonstrated adequate safety and efficacy for PCC in the reversal of anticoagulation for urgent neurosurgical procedures. There was no significant difference between PCC and FFP, though further trials would be useful in demonstrating the safety and efficacy of PCC in this setting.