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glucose 132&#59; urea 32&#44; creatinine 1&#46;15mg&#47;dl&#59; Na 133&#44; K 5&#46;5&#59; Cl 101mEq&#47;l&#59; osmolality 371mOsm&#47;kg&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Haemogram&#58; WBC 23 400 &#40;N 78&#44; C 11&#44; L 9&#44; M 2&#41;&#59; Hgb 18&#46;3g&#47;dl&#59; Hct 56&#37;&#59; platelets 264 000&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Osmolar gap calculation&#58; 92&#46;3mOsm&#47;kg &#40;osmolality measurement - &#123;Na &#91;mEq&#47;l&#93; x 2 &#43; urea&#47;6 &#43; glycaemia &#47;18 &#40;mg&#47;dl&#41;&#125;&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Anion gap calculation&#58; 34&#46;5mEq&#47;l &#40;&#91;Na &#43; K&#93; - &#91;Cl &#43; HCO<span class="elsevierStyleInf">3</span>&#93;&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Methanol poisoning was suspected and 1M bicarbonate was prescribed and the patient was transferred to the ICU&#44; 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350ml&#47;min&#44; starting at 250ml&#47;min&#44; then after finding good haemodynamic tolerance at 1h&#44; increased to 350ml&#47;min&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Qd &#40;dialysate flow&#41;&#58; 800ml&#47;min&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Dialysate&#58; Fresenius A34 supplemented with KCl up to 4mEq&#47;l&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">UF&#58; zero&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Anticoagulation&#58; enoxaparin &#40;Clexane&#41; 20 at the start of each session&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Dose of ethanol doubled during the dialysis&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">After dialysis the patient improved clinically&#44; and was extubated and transferred to the psychiatric ward the same day&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Hourly methanol extractions were performed &#40;at the start of HD&#44; and then hourly&#41; and 4 hours after ending the second session &#40;Figure 1&#41;&#46; The levels were significantly reduced&#44; reaching minimum values after the third hour&#46; However&#44; when stopping dialysis &#40;while changing the filter&#41; a relapse &#40;64mg&#47;dl&#41; was noted&#44; but the patient returned to minimum values after restarting the session&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Discussion </span></p><p class="elsevierStylePara">HD<span class="elsevierStyleSup">2-4</span> is used for severe methanol poisoning&#46; Its indications are<span class="elsevierStyleSup">5</span>&#58; blood methanol level &#62;50 mg&#47;dl &#40;not immediately available in our centre&#41;&#44; severe metabolic acidosis&#44; visual or neurological disturbances and &#62;30ml methanol intake&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Very prolonged HD sessions have been reported &#40;&#62;1 day&#41;&#46;<span class="elsevierStyleSup">6</span> Hirsch<span class="elsevierStyleSup">7</span> calculates the duration of HD according to levels of methanol &#91;t&#40;hours&#41;&#61;-Vln&#40;5&#47;A&#41;&#47;0&#46;06k&#44; where t is time in hours&#44; V is the volume of body water measured by Watson&#44; A is the level of methanol in blood in mg&#47;dl and k is 80&#37; of urea clearance estimated by the manufacturer&#93;&#46; The level of methanol can be inferred using the osmolar gap&#44; since there is a good correlation between both values&#44;<span class="elsevierStyleSup">1</span> minus the normal gap &#40;10-12mOsm&#47;kg&#41;&#46; In our case the gap was 92mOsm&#47;kg&#44; which would be about 250mg&#47;dl&#44; with an estimated HD duration of 9 hours&#46;</p><p class="elsevierStylePara">The fall of methanol in the blood was greater than in the Hirsch study&#44;<span class="elsevierStyleSup">7</span> with a relapse while the filter was being changed&#46; This may be because large surface membranes with a high dialysate flow the poison is quickly removed from the vascular compartment&#44; but time is needed for the rest of the poison to be released from the extra-vascular space into the bloodstream&#46;</p><p class="elsevierStylePara">There are no studies comparing intermittent and continuous HD techniques&#44;<span class="elsevierStyleSup">1&#44;8</span> but obviously intermittent HD is always faster&#46; If these findings are confirmed&#44; combining the two techniques should be considered &#40;for example&#44; HD of 3-4 hours followed by the continuous technique&#41; or the Hirsch formula corrected&#46;</p><p class="elsevierStylePara"><a href="grande&#47;10653&#95;108&#95;13128&#95;en&#95;10653&#95;f31&#46;jpg" class="elsevierStyleCrossRefs"><img src="10653_108_13128_en_10653_f31.jpg" alt="Evolution of blood methanol levels during the haemodialysis sessions"></img></a></p><p class="elsevierStylePara">Figure 1&#46; Evolution of blood methanol levels during the haemodialysis sessions</p>"
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Methanol poisoning. Evolution of blood levels with high-flux haemodialysis
Intoxicación por metanol. Evolución de niveles sanguíneos con hemodiálisis de alto flujo
, J.I.. MINGUELAb, M.J.. LANZAGORTAc, A.. HERNANDOb, J.. AUDICANAd
b Servicio de Nefrología, Hospital Galdakao, Galdakao, Bizkaia,
c Servicio de Nefrología. Unidad de Hemodiálisis, Hospital Galdakao, Galdakao, Bizkaia,
d Unidad de Cuidados Intensivos, Hospital Galdakao, Galdakao, Bizkaia,
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">To the Editor&#44; </span></p><p class="elsevierStylePara">Although rare in our area&#44; and related to accidents or suicide attempts&#44; methanol poisoning is increasing due to the arrival of immigration&#46;<span class="elsevierStyleSup">1</span> We report the case of a person with severe methanol poisoning treated with haemodialysis &#40;HD&#41;&#46; Serial samples were taken to assess the decrease of blood methanol levels during dialysis&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Case report </span></p><p class="elsevierStylePara">A 38-year old male with a history of alcoholism was admitted to the emergency department with visual disturbances&#44; abdominal pain and vomiting&#46;</p><p class="elsevierStylePara">For days beforehand&#44; he had been drinking perfume and 96&#176; alcohol from a chemists&#46; The day before admission&#44; he voluntarily ingested 200ml of methylated spirit and ethanol &#40;not knowing it was toxic&#46;&#41; He was admitted to the emergency room with blurred vision&#44; unsteadiness&#44; epigastric pain and an episode of vomiting which could not be distinguished as containing blood or not&#46; He also reported fatigue and dyspnoea&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Physical examination in the emergency department </span></p><p class="elsevierStylePara">His breathing rate was 40 breaths per minute&#44; with right hypochondrium pain&#46; No bowel sounds were detected&#46; His pupils were dilated&#44; poorly reactive&#44; and he was very sleepy&#46; There was no language impairment&#44; nystagmus or dysmetria in the finger-nose test&#46;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Additional tests in the emergency department </span></p><p class="elsevierStylePara">Arterial blood gases&#58; pH 6&#46;99&#59; pCO<span class="elsevierStyleInf">2</span> 8 mmHg&#59; pO<span class="elsevierStyleInf">2</span> 138 mm Hg&#59; bicarbonate 3mEq&#47;l&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Biochemistry&#58; glucose 132&#59; urea 32&#44; creatinine 1&#46;15mg&#47;dl&#59; Na 133&#44; K 5&#46;5&#59; Cl 101mEq&#47;l&#59; osmolality 371mOsm&#47;kg&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Haemogram&#58; WBC 23 400 &#40;N 78&#44; C 11&#44; L 9&#44; M 2&#41;&#59; Hgb 18&#46;3g&#47;dl&#59; Hct 56&#37;&#59; platelets 264 000&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Osmolar gap calculation&#58; 92&#46;3mOsm&#47;kg &#40;osmolality measurement - &#123;Na &#91;mEq&#47;l&#93; x 2 &#43; urea&#47;6 &#43; glycaemia &#47;18 &#40;mg&#47;dl&#41;&#125;&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Anion gap calculation&#58; 34&#46;5mEq&#47;l &#40;&#91;Na &#43; K&#93; - &#91;Cl &#43; HCO<span class="elsevierStyleInf">3</span>&#93;&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Methanol poisoning was suspected and 1M bicarbonate was prescribed and the patient was transferred to the ICU&#44; where ethanol infusion is started&#46; The patient was intubated for agitation and respiratory depression&#46; The intravenous route was accessed and HD was begun with the following programme&#58; two consecutive sessions of 4 hours&#44; with a change of filter between&#44; to prevent blood clots and loss of efficiency&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Monitor&#58; Fresenius 4008S &#40;Fresenius Medical Care&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Duration&#58; 4 &#43; 4 hours&#46; Only stopped to change the filter and lines and purge the new system &#40;10 min&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Membrane&#58; polyarylethersulphone &#40;Arylane M9&#44; Gambro&#41;&#46; Surface&#58; 2&#46;01m<span class="elsevierStyleSup">2</span>&#59; UF coefficient 23ml&#47;h&#47;mm Hg&#44; C&#46; urea &#40;Qb 300 and Qd 500&#44; 264ml&#47;min&#41;&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Qb &#40;blood flow&#41;&#58; 350ml&#47;min&#44; starting at 250ml&#47;min&#44; then after finding good haemodynamic tolerance at 1h&#44; increased to 350ml&#47;min&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Qd &#40;dialysate flow&#41;&#58; 800ml&#47;min&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Dialysate&#58; Fresenius A34 supplemented with KCl up to 4mEq&#47;l&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">UF&#58; zero&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Anticoagulation&#58; enoxaparin &#40;Clexane&#41; 20 at the start of each session&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Dose of ethanol doubled during the dialysis&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">After dialysis the patient improved clinically&#44; and was extubated and transferred to the psychiatric ward the same day&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Hourly methanol extractions were performed &#40;at the start of HD&#44; and then hourly&#41; and 4 hours after ending the second session &#40;Figure 1&#41;&#46; The levels were significantly reduced&#44; reaching minimum values after the third hour&#46; However&#44; when stopping dialysis &#40;while changing the filter&#41; a relapse &#40;64mg&#47;dl&#41; was noted&#44; but the patient returned to minimum values after restarting the session&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Discussion </span></p><p class="elsevierStylePara">HD<span class="elsevierStyleSup">2-4</span> is used for severe methanol poisoning&#46; Its indications are<span class="elsevierStyleSup">5</span>&#58; blood methanol level &#62;50 mg&#47;dl &#40;not immediately available in our centre&#41;&#44; severe metabolic acidosis&#44; visual or neurological disturbances and &#62;30ml methanol intake&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara">Very prolonged HD sessions have been reported &#40;&#62;1 day&#41;&#46;<span class="elsevierStyleSup">6</span> Hirsch<span class="elsevierStyleSup">7</span> calculates the duration of HD according to levels of methanol &#91;t&#40;hours&#41;&#61;-Vln&#40;5&#47;A&#41;&#47;0&#46;06k&#44; where t is time in hours&#44; V is the volume of body water measured by Watson&#44; A is the level of methanol in blood in mg&#47;dl and k is 80&#37; of urea clearance estimated by the manufacturer&#93;&#46; The level of methanol can be inferred using the osmolar gap&#44; since there is a good correlation between both values&#44;<span class="elsevierStyleSup">1</span> minus the normal gap &#40;10-12mOsm&#47;kg&#41;&#46; In our case the gap was 92mOsm&#47;kg&#44; which would be about 250mg&#47;dl&#44; with an estimated HD duration of 9 hours&#46;</p><p class="elsevierStylePara">The fall of methanol in the blood was greater than in the Hirsch study&#44;<span class="elsevierStyleSup">7</span> with a relapse while the filter was being changed&#46; This may be because large surface membranes with a high dialysate flow the poison is quickly removed from the vascular compartment&#44; but time is needed for the rest of the poison to be released from the extra-vascular space into the bloodstream&#46;</p><p class="elsevierStylePara">There are no studies comparing intermittent and continuous HD techniques&#44;<span class="elsevierStyleSup">1&#44;8</span> but obviously intermittent HD is always faster&#46; If these findings are confirmed&#44; combining the two techniques should be considered &#40;for example&#44; HD of 3-4 hours followed by the continuous technique&#41; or the Hirsch formula corrected&#46;</p><p class="elsevierStylePara"><a href="grande&#47;10653&#95;108&#95;13128&#95;en&#95;10653&#95;f31&#46;jpg" class="elsevierStyleCrossRefs"><img src="10653_108_13128_en_10653_f31.jpg" alt="Evolution of blood methanol levels during the haemodialysis sessions"></img></a></p><p class="elsevierStylePara">Figure 1&#46; Evolution of blood methanol levels during the haemodialysis sessions</p>"
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