Snakebite Associated Thrombotic Microangiopathy and Recommendations for Clinical Practice

Snakebite is a significant and under-resourced global public health issue. Snake venoms cause a variety of potentially fatal clinical toxin syndromes, including venom-induced consumption coagulopathy (VICC) which is associated with major haemorrhage. A subset of patients with VICC develop a thrombotic microangiopathy (TMA). This article reviews recent evidence regarding snakebite-associated TMA and its epidemiology, diagnosis, outcomes, and effectiveness of interventions including antivenom and therapeutic plasma-exchange. Snakebite-associated TMA presents with microangiopathic haemolytic anaemia (evidenced by schistocytes on the blood film), thrombocytopenia in almost all cases, and a spectrum of acute kidney injury (AKI). A proportion of patients require dialysis, most survive and achieve dialysis free survival. There is no evidence that antivenom prevents TMA specifically, but early antivenom remains the mainstay of treatment for snake envenoming. There is no evidence for therapeutic plasma-exchange being effective. We propose diagnostic criteria for snakebite-associated TMA as anaemia with >1.0% schistocytes on blood film examination, together with absolute thrombocytopenia (<150 × 109/L) or a relative decrease in platelet count of >25% from baseline. Patients are at risk of long-term chronic kidney disease and long term follow up is recommended.

Therapeutic Plasma Exchange in Guillain Barre Syndrome: An experience of Bangabanhu Sheikh Mujib Medical University, Bangladesh

Background: Therapeutic plasma exchange (TPE) has been used as one of the treatment modalities of neurological diseases. Intravenous Immunoglobulin (IVIG) and Therapeutic Plasma Exchange (TPE)are treatment options in Guillain Barre syndrome (GBS). In developing countries IVIG is not easily available and it is also expensive, TPE is preferred for treatment of GBS as it is affordable. Study on TPE for GBS are scarce here. Most of the study regarding TPE in GBS has been conducted in high –income countries as it is expensive treatment modality. Reports on TPE in GBS is very scared from Bangladesh. Materials and Methods: A retrospective analysis of TPE with a standard hemolysis equipment for the treatment of Guillain Barre syndrome (GBS) was conducted A 50 patients of GBS who received TPE conducted between January 2017 to December 2018 in the department of Transfusion Medicine, Bangabandhu Sheikh Mujib Medical University, Dhaka, Bangladesh were analyzed. All patients had underdone at least 2 cycles of plasma exchange. Volume exchanged in each cycle was one plasma volume. Results: Out of 50 cases there were 43 (86%) male and 7 (14%) female. Age range of patients was from 11 – 50 years. Approximately 40% improved clinically of first cycle of PE & 85% after second cycle, 95% after third cycle and 95-100% after 5 cycle. 1(2%) patient died, and 49(98%) patients survived and recovered. Conclusion: The treatment is cost affection in Compassion to IVIG. TPE is and affection, safe and affordable treatment modality for GBS.

Serious acid-base disorder or life-threatening arrhythmia in patients with ABO-incompatible liver transplantation who received therapeutic plasma exchange : A report of two cases

Background: Excessive citrate load during therapeutic plasma exchange (TPE) can cause metabolic alkalosis with compensatory hypercarbia and electrolyte disturbances. If TPE is required immediately before ABO-incompatible (ABOi) liver transplant (LT) surgery, metabolic derangement and severe electrolyte disturbance could worsen during LT anesthesia.Case: We report two ABOi LT cases who received TPE on the day of surgery because isoagglutinin titers did not be dropped below 1:8. One case had a surprisingly high metabolic alkalosis with a pH of 7.73 immediately after tracheal intubation because of hyperventilation during mask bagging. The other experienced sudden ventricular tachycardia and blood pressure drop after surgical incision accompanied with severe hypokalemia of 1.8 mmol/L despite supplementation with potassium.Conclusions: Special attention should be paid to patients who just completed TPE the operative day morning as they are vulnerable to severe acid-base disturbances and life-threatening ventricular arrhythmias in ABOi LT.