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Extracorporeal Treatment of Intoxications Anne-Corne´Lie J.M

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Extracorporeal Treatment of Intoxications Anne-Corne´Lie J.M Extracorporeal treatment of intoxications Anne-Corne´lie J.M. de Pont Purpose of review Introduction The purpose of this article is to provide the critical care Although intoxication is a common problem in adult and clinician with a comprehensive review of the indications for pediatric medicine, serious morbidity is unusual. In 2004, extracorporeal elimination of toxic substances, to only 3% of all toxic exposures reported to the Toxic summarize the different techniques and the intoxications for Exposure Surveillance System of the American Associ- which these techniques are suitable. ation of Poison Centers were treated in an ICU and in only Recent findings 0.05% extracorporeal treatment was needed [1]. Extracor- In the last year, several excellent reviews about toxicological poreal treatment, however, may be lifesaving in victims topics have been published. These reviews focused on of poisoning, especially when natural elimination intoxications in children, the approach of the patient with an mechanisms are impaired. This article reviews the charac- unknown overdose, management of intoxications with teristics of different extracorporeal techniques and sum- salicylates, b-blockers and calcium antagonists and liver marizes the intoxications for which they are suitable. support systems. Important developments include the use of high-flux, high-efficiency membranes and albumin dialysis Indication using the molecular adsorbent recirculating system The use of extracorporeal techniques to remove toxins is (MARS). This system offers possibilities for the removal of justified if there is an indication of severe toxicity (Table 1) protein-bound substances such as diltiazem, phenytoin and and if the total body elimination of the toxin can be theophylline. increased by 30% or more by using an extracorporeal Summary technique [2]. Whether extracorporeal removal is possible Although large randomized controlled trials are scarce in the depends on characteristics of the toxin itself and of the field of toxicology, the treatment of intoxications is elimination technique used (Table 2). As the majority of becoming more and more evidence based. This review reported toxic exposures occur in children of less than summarizes the current knowledge and recommendations 6 years old [3], it is important to know which substances concerning the extracorporeal treatment of intoxications are lethal for children, even in low doses [4,5]. These and discusses new developments in the field, such as the substances are summarized in Table 3. use of high-flux, high-efficiency membranes and albumin dialysis. Techniques available for extracorporeal removal of toxins Keywords The extracorporeal techniques most frequently employed hemodialysis, hemofiltration, hemoperfusion, intoxication, for the removal of toxins are hemodialysis, continuous poisoning hemofiltration techniques, hemoperfusion and the molecular adsorbent recirculating system (MARS). Curr Opin Crit Care 13:668–673. ß 2007 Wolters Kluwer Health | Lippincott Williams & Wilkins. Hemodialysis Adult Intensive Care Unit, Academic Medical Center, University of Amsterdam, During hemodialysis, toxins and other substances are The Netherlands cleared from the blood by diffusion across a semiperme- Correspondence to Anne-Corne´lie J.M. de Pont, Adult Intensive Care Unit, C3-327, able membrane down a concentration gradient from blood Academic Medical Center, Meibergdreef 9, NL-1105 AZ Amsterdam, The Netherlands into dialysate. In order to be removed by hemodialysis, the Tel: +31 20 5669111 ext 59229; fax: +31 20 5669568; toxic substance must be water soluble and must have a low e-mail: [email protected] molecular weight, low protein binding and a low volume of Current Opinion in Critical Care 2007, 13:668–673 distribution (Table 2). During hemodialysis, the clearance Abbreviation of a toxic substance depends on membrane surface area MARS molecular adsorbent recirculating system and type, as well as on blood and dialysate flow rates. The larger the membrane surface, the greater the amount of toxin removed. Newer high-flux membranes can also ß 2007 Wolters Kluwer Health | Lippincott Williams & Wilkins 1070-5295 remove high-molecular weight substances. Increasing blood and dialysate flow rates can increase the concen- tration gradient between blood and dialysate, thus opti- mizing the rates of diffusion and elimination. The major drawback of hemodialysis is the risk of rebound toxicity 668 Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. Extracorporeal treatment of intoxications de Pont 669 Table 1 Indications of severe toxicity Table 3 Substances able to kill children at low doses (1) Ingested quantity associated with severe toxicity Calcium antagonists (2) Ingestion of a toxin with serious delayed effects Camphor (3) Natural removal mechanism impaired Clonidine and other imidazolines (4) Clinical condition deteriorating Lomotil (diphenoxylate/atropine) (5) Clinical evidence of severe toxicity: hypotension, coma, Opiates metabolic acidosis, respiratory depression, dysrhythmias Salicylates or cardiac decompensation Sulfonylureas Toxic alcohols Adapted from Orlowski et al. [2]. Tricyclic antidepressants Adapted from Michael and Sztajnkrycer [5]. Table 2 Necessary properties for extracorporeal removal by three different techniques Hemodialysis Hemofiltration Hemoperfusion Hemoperfusion Solubility water water water or lipid During hemoperfusion, the blood passes through a Molecular weight <500 Da <40 000 Da <40 000 Da cartridge containing a sorbent material able to adsorb Protein binding low (<80%) low low or high Volume of distribution <1 l/kg <1 l/kg <1 l/kg the toxin. There are three types of sorbents: charcoal- Endogenous clearance <4 ml/min/kg <4 ml/min/kg <4 ml/min/kg based sorbents, synthetic resins and anion exchange resins. Distribution time short longer short In order to be removed by hemoperfusion, the toxic Adapted from Orlowski et al. [2]. substance must have binding affinity to the sorbent in the cartridge and a low volume of distribution (Table 2). after cessation of the treatment, due to redistribution of Charcoal efficiently removes molecules in the 1000– the toxin. 1500 kDa range, but does not remove protein-bound mol- ecules [7]. Resins are more effective in the removal of Continuous techniques protein-bound and lipid-soluble molecules. Despite their In continuous hemofiltration techniques such as continu- efficacy, the use of hemoperfusion cartridges has declined ous venovenous hemofiltration (CVVH) and continuous over the last 20 years, due to limitations of their indications venovenous hemodiafiltration (CVVHD), the blood and shelf life. Moreover, hemoperfusion is technically passes through large pore hollow fibres, allowing the more difficult to perform than hemodialysis, and convective removal of molecules up to 40 kDa. The lacks the possibility of correcting acid–base, fluid and advantages of continuous techniques are their applica- electrolyte abnormalities [8]. bility in hemodynamically unstable patients and the prolonged duration of therapy, minimizing the risk of a Molecular adsorbent recirculating system rebound effect [6]. The disadvantage of continuous tech- MARS is a blood purification system, aimed at removing niques is their lower clearance compared with hemodia- albumin-bound toxic molecules [9,10]. It consists of lysis. In postdilutional hemofiltration, the clearance is three serial extracorporeal circuits: a blood circuit, an equal to the ultrafiltrate flow rate, which is usually no albumin detoxification circuit and a hemodialysis circuit more than 4 l/h or 67 ml/min, whereas with hemodialysis a (Fig. 1) [11]. The patient’s blood passes the blood com- clearance up to 500 ml/min can be achieved [2]. partment of a high-flux dialyzer, where albumin flows Figure 1 Molecular Adsorbent Recirculating System (MARS) circuit Q-albumin Q-dialysate Blood pump Bicarbonate PAE Low-flux buffered dialyzer dialysate Adsorption columns MARS- module Charcoal Albumin pump Q-blood Ion-exchange PAA Blood circuit Albumin circuit Single pass dialysis Reprinted with permission from Covic et al. [11]. Copyright © Lippincott Williams & Wilkins. Unauthorized reproduction of this article is prohibited. 670 Renal system through the dialysate compartment in a countercurrent volume of 0.6–0.9 l/kg body weight and it is not protein fashion. Protein-bound and water soluble substances can bound, which makes it an ideal substance to be removed by enter the albumin circuit by means of diffusion. The hemodialysis. With hemodialysis, an extraction ratio of albumin circuit contains two filters, an activated charcoal 90% and a clearance ranging from 63 to 114 ml/min is filter which absorbs the toxins and an anion-exchange achieved, making it the treatment of choice for extracor- resin filter to cleanse the albumin. Finally, the albumin poreal lithium removal [17]. Hemodialysis is even more passes through the blood compartment of a second effective in removing lithium than the kidney itself, as dialyzer, where small molecules are filtered down a 70–80% of lithium filtered by the kidney is reabsorbed in concentration gradient to bicarbonate dialysate [12]. the proximal tubule. Hemodialysis should be started in Although the efficacy of MARS in the removal of cases of central nervous system abnormalities such as protein-bound drugs such as diltiazem, phenytoin and confusion, stupor, coma or seizures. A negative anion theophylline has been demonstrated in case reports, the gap and an elevated osmolar
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