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Letter to the Editor
Clozapine-associated myocarditis
Miocarditis aguda secundaria a clozapina
Javier Molina Martín de Nicolás
Corresponding author
javier.molina.mdn@gmail.com

Corresponding author.
, Juan José Parra Fuertes, Eloy Gómez Mariscal, Belén Díaz Antón
Servicio de Cardiología, Hospital Universitario 12 de Octubre, Madrid, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Myocarditis is a disorder difficult to diagnose and&#44; despite the long list of causes&#44; the etiology remains unknown in all but 22&#8211;33&#37; of the cases&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">1</span></a> Described in 1999 by Kilian et al&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">2</span></a> clozapine is the only antipsychotic drug related to myocarditis&#44; with a very low associated risk &#40;1&#47;500 to 1&#47;10&#44;000 treated individuals&#41;&#44; with an overall incidence of 0&#46;015&#8211;0&#46;187&#37;&#44; reaching 1&#46;2&#37; in Australia&#44;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> surpassing agranulocytosis &#40;1&#37;&#41;&#46; Only 2 cases have been reported in Spain<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">4&#44;5</span></a> but there is growing awareness of the cardiac side effects &#40;myocarditis&#44; pericarditis and dilated cardiomyopathy&#41; of clozapine&#46; Given that the prognosis is much less favorable if diagnosis is delayed&#44; it is of great interest to recall this not so uncommon condition to the scientific community&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">We report the case of a 43-year-old man&#44; diagnosed with paranoid schizophrenia resistant to various antipsychotics&#44; who was admitted to the department of psychiatry to start treatment with clozapine&#44; with incremental doses of up to 200<span class="elsevierStyleHsp" style=""></span>mg&#47;day&#46; After 13 days of treatment&#44; he presented with a lack of energy&#44; fever peaks up to 38&#46;5<span class="elsevierStyleHsp" style=""></span>&#176;C&#44; cough producing whitish sputum&#44; and pleuritic chest pain&#46; On physical examination&#44; the patient was tachycardic and afebrile&#46; He had elevated jugular venous pressure&#44; grade III&#47;IV systolic ejection murmur at left sternal border&#44; S3 gallop&#44; no pericardial rub and minor bibasilar crackles&#46; An electrocardiogram &#40;ECG&#41; showed sinus tachycardia&#44; and chest X-ray revealed signs of mild heart failure&#46; Laboratory tests were remarkable for elevated inflammatory markers &#40;mild leukocytosis&#44; elevated C-reactive protein &#91;CRP&#93;&#58; 17<span class="elsevierStyleHsp" style=""></span>mg&#47;dL&#41;&#44; and elevated cardiac enzymes&#44; with peaks of creatine kinase reaching 1116<span class="elsevierStyleHsp" style=""></span>IU&#47;L&#44; high-sensitivity troponin T of 474<span class="elsevierStyleHsp" style=""></span>ng&#47;L&#44; and N-terminal pro-brain natriuretic peptide &#40;NT-proBNP&#41; of 5865<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#46; Transthoracic echocardiography &#40;TTE&#41; highlighted global left ventricular hypokinesis and moderate systolic dysfunction &#40;38&#37; by Simpson&#39;s biplane method&#41;&#59; the pericardium was not thickened&#44; but was hyperechogenic with mild effusion&#46; As acute myocarditis was suspected&#44; the patient was commenced on antiinflammatory doses of acetylsalicylic acid&#44; beta-blockers and an angiotensin-converting enzyme inhibitor&#59; and clozapine was discontinued&#46; Two days later&#44; cardiac enzymes and inflammatory parameters had normalized&#44; as had NT-proBNP and TTE after a week&#46; The patient could not undergo cardiac magnetic resonance imaging for being claustrophobic&#46; The causal association between myocarditis and clozapine is inferred by the temporal sequence between the initiation of treatment and symptom onset &#40;which is the interval most frequently reported in the literature&#41; and by a patent improvement after drug discontinuation&#46; Moreover&#44; all other etiologies were considered less likely&#44; given the fact that he was an inpatient&#44; with no previous or intercurrent diseases and without drugs or toxics interactions&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The diagnosis of clozapine-related myocarditis requires a high degree of clinical suspicion&#46; An Australian registry of 116 cases&#44; the largest in the medical literature&#44; reflects the variability and lack of specificity of signs and symptoms of this clinical condition&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">3</span></a> The most likely mechanism of action is an IgE-mediated hypersensitivity&#46; The most frequent symptoms are fever&#44; chest pain&#44; dyspnea and flu symptoms&#46; The most common signs are TTE and ECG abnormalities&#44; tachycardia&#44; elevated cardiac enzymes&#44; leukocytosis&#44; neutrophilia and eosinophilia&#46; The severity of the condition ranges from subclinical forms to sudden death&#46; Myocarditis develops within the first 2 months after the initiation of clozapine in 85&#37; of the cases&#44; from day 8 to day 21 in 63&#37;&#44; the median being day 17&#46; Of note&#44; leukocytosis and eosinophilia have been reported during treatment in the absence of signs of myocarditis&#44; and its significance remains unclear&#46; Hypotension and tachycardia can be a transient and benign effect during drug titration&#46; Most cases resolve spontaneously without sequelae after drug discontinuation&#44; but deaths have been reported&#46; The Australian records reflect a mortality of 10&#37; although&#44; in some series&#44; it reaches 23&#37;&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">6</span></a> being higher in undiagnosed patients and those with a late diagnosis&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Clozapine&#44; a tricyclic benzodiazepine&#44; is an atypical neuroleptic indicated in antipsychotic-resistant schizophrenia&#46; Gradual titration and avoidance of the concomitant use of valproic acid are recommended&#46; Various strategies for monitoring cardiac involvement<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">7</span></a> using laboratory parameters &#40;CRP&#44; troponin&#44; NT-proBNP&#41;&#44; ECG and TTE have been put forward&#44; but given the low prevalence of myocarditis and the limited use of the drug&#44; they have not been widely implemented&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">The purpose of this short review is to highlight that&#58; &#40;a&#41; the diagnosis of myocarditis requires a high index of suspicion&#59; &#40;b&#41; clozapine is a rare but possible cause&#59; and &#40;c&#41; early diagnosis is necessary to improve the prognosis of these patients&#46;</p></span>"
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Original language: English
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