What is Hemoperfusion?
Hemoperfusion is an extracorporeal blood purification technique that removes toxins, drugs, and inflammatory mediators from blood by passing it through a cartridge containing adsorbent materials (typically activated charcoal or synthetic resins), which bind and extract small- to medium-sized molecules that are difficult to remove by conventional hemodialysis. 1, 2, 3
Technical Principles
Hemoperfusion works through direct adsorption of target molecules onto specialized sorbent materials contained within a cartridge through which blood is circulated extracorporeally. 4, 5 The key technical features include:
- Adsorbent materials: Modern hemoperfusion uses biocompatible synthetic polymers, biomimetic coatings, and novel matrix structures that have significantly improved safety compared to older charcoal-based systems 6, 5
- Molecular removal: Effectively removes small- to medium-sized molecules including toxins, drugs, cytokines, and other pathogenic factors from the bloodstream 7, 3
- Biocompatibility: Recent technological advances have addressed early problems with bioincompatibility, making contemporary hemoperfusion devices much safer 5
Primary Clinical Applications
Acute Poisoning and Drug Overdose
Hemoperfusion is an established and recommended treatment modality for severe poisoning cases, particularly when standard therapies fail or specific clinical criteria are met. 1, 2
For salicylate poisoning, hemoperfusion is recommended as an acceptable alternative when hemodialysis is unavailable, though intermittent hemodialysis remains the preferred modality. 1 Specific indications include:
- Altered mental status 1
- Acute respiratory distress syndrome requiring supplemental oxygen 1
- Failure of standard therapy 1
- Salicylate concentrations >7.2 mmol/L (100 mg/dL) 1
For barbiturate poisoning, hemoperfusion is recommended as an acceptable alternative modality in adults if hemodialysis is not available. 2 Indications include:
- Prolonged coma (present or expected) 2
- Shock after fluid resuscitation 2
- Persistent toxicity despite multiple-dose activated charcoal 2
Emerging Applications
Hemoperfusion shows promise in critical care settings beyond traditional poisoning indications, though evidence quality varies. 7, 4
- Sepsis and inflammatory states: Non-selective hemoperfusion and endotoxin-binding devices (polymyxin B) are under active investigation for septic shock, with mixed results to date 4, 5
- Severe COVID-19: Multiple studies (873 patients across 20 studies) reported improved respiratory parameters and better survival rates when hemoperfusion was used in severe COVID-19, though most evidence comes from observational studies 7
- Chronic kidney disease: Growing evidence supports hemoperfusion as adjuvant treatment for accumulated uremic toxins in end-stage renal disease 6
Safety Profile
Modern hemoperfusion is generally well-tolerated with infrequent complications when performed by trained personnel. 2, 7 The improved biocompatibility of contemporary sorbents has markedly reduced the adverse events seen with older charcoal-based systems. 5
Common Pitfalls
- Modality selection: Hemoperfusion should not be used as first-line when hemodialysis is available and appropriate for the specific toxin (e.g., salicylates, barbiturates) 1, 2
- Timing: Hemoperfusion should be initiated early in severe poisoning cases rather than waiting for clinical deterioration 1, 2
- Adjunctive therapies: Continue other appropriate treatments (e.g., multiple-dose activated charcoal for barbiturates) during hemoperfusion 2