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Letter to the Editor
Fulminant myocarditis with myositis after treatment with immune checkpoint inhibitors
Miocarditis fulminante con miositis tras tratamiento con inhibidores de checkpoint
Teba González-Ferreroa,
Corresponding author
tebagf@gmail.com

Corresponding author.
, Kelly Vargas-Osoriob, José Ramón González-Juanateya,c
a Servicio de Cardiología, Hospital Clínico Universitario, IDIS, Servicio Gallego de Salud (SERGAS), Santiago de Compostela, Spain
b Servicio de Anatomía Patológica, Hospital Clínico Universitario, IDIS, Servicio Gallego de Salud (SERGAS), Santiago de Compostela, Spain
c Facultad de Medicina, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Immune checkpoint inhibitors &#40;ICIs&#41; have revolutionized cancer treatment&#44; achieving unprecedented efficacy in multiple malignancies such as lung cancer&#44; melanoma and kidney cancer&#46; However&#44; despite their excellent therapeutic effect&#44; these medications typically lead to a wide spectrum of toxicity reactions and immune-related adverse events&#46; Cardiotoxicity is uncommon but has high mortality and has not been well recognized&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Case report</span><p id="par0010" class="elsevierStylePara elsevierViewall">A 70-year-old man with arterial hypertension and dyslipidemia with was diagnosed with clear cell renal cell carcinoma&#44; WHO&#47;ISUP grade 3&#44; pT3a&#44; cN1&#44; cM1&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Treatment consisted of a right nephrectomy with adrenalectomy&#44; followed by immune checkpoint inhibitors &#40;ipilimumab&#47;nivolumab&#41;&#46; Two weeks after the first cycle of drugs&#44; the patient was referred to our hospital due to severe asthenia and dyspnea&#46; Initial ECG showed right bundle branch block with sinus tachycardia&#46; At physical exploration&#44; the patient did not have cardiac murmurs but presented tachypnea and signs of respiratory failure&#46; Blood pressure was 130&#47;76<span class="elsevierStyleHsp" style=""></span>mmHg&#44; and heart rate was 110 beats per minute&#46; Initial laboratory testing revealed raised levels of CK at 9800 &#40;normal range 38&#8211;174&#41;&#44; troponin I at 35 &#40;NR<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;017&#41; and myoglobin at 20&#44;000&#59; acute kidney failure with creatinine of 2&#46;2&#59; and acute liver failure with INR of 1&#46;5&#44; TOG of 655&#59; TGP of 301&#44; probably related to muscle involvement&#44; as rhabdomyolysis is often associated with a raise of aminotransferases&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Due to these alterations&#44; a TTE &#40;transthoracic echocardiogram&#41; was performed&#46; Moderate left ventricle hypertrophy&#44; preserved biventricular systolic function and no valvulopathies were found&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">The first suspected diagnosis was ICI-induced myocarditis and myositis&#44; so a high dose of glucocorticoids was initiated &#40;2<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#47;day intravenous methylprednisolone&#41;&#46; Within 24<span class="elsevierStyleHsp" style=""></span>h&#44; a new auriculoventricular &#40;AV&#41; conduction delay appeared&#44; later followed by complete AV block&#44; so a temporary pacemaker was placed&#46; Progressive clinical deterioration followed&#44; with multisystem organ failure&#46; Serial echocardiography revealed severely depressed biventricular systolic function&#46; He was treated with a higher dose of glucocorticoids &#40;methylprednisolone 1<span class="elsevierStyleHsp" style=""></span>g&#47;kg&#41;&#44; mycophenolate mofetil and even plasmapheresis&#46; Thoracic computed tomography showed nothing relevant&#44; as did bronchoscopy&#46; Despite intensive support therapy&#8212;intubation&#44; mechanical ventilation and hemodiafiltration&#8212;respiratory failure was impossible to manage&#44; leading to the patient passing away&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">The post-mortem examination revealed a severe lymphohistiocytic inflammatory infiltrate&#44; diffusely affecting the heart and skeletal muscle&#46; This infiltrate consisted mainly of a necrotizing and inflammatory myopathy CD3-&#44; CD4- and CD8-positive T lymphocytes&#44; along with numerous CD68-positive macrophages&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Very few CD20-positive lymphocytes were observed&#46; Cardiac involvement was diffuse&#44; with inflammatory aggregates destroying myocardial fibers distributed throughout the atrial and ventricular tissue &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Discussion</span><p id="par0040" class="elsevierStylePara elsevierViewall">ICIs have changed the treatment and prognosis of several types of cancer&#46; However&#44; the majority of patients suffer side effects&#44; which are occasionally severe&#46; Myocarditis occurred more frequently early after treatment and was more recurrent with the combination of ICI than with single therapy&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">First testing in a case of ICI-associated myocarditis should be ECG &#40;usual changes are nonspecific&#41; and echocardiogram to provide left ventricular ejection fraction&#46; However&#44; normal TTE does not rule out myocarditis&#46; To accurately diagnose myocarditis&#44; a CMR &#40;cardiovascular magnetic resonance&#41; should be performed&#46; However&#44; CMR might not be feasible in patients who require invasive management due to hemodynamic instability&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">1</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">Endomyocardial biopsy &#40;EMB&#41; is considered the gold standard diagnostic test for inflammatory cardiomyopathy and it is a fundamental tool in ICI-related myocarditis&#46; Nevertheless&#44; it has its own limitations&#44; specially in patchy or focal cases&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">2</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">In most of the cases muscle biopsy showed a marked phenomenon of necrosis&#44; macrophage and muscle regeneration with perivascular inflammatory infiltrates with a large component of macrophagic cells&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">3</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">Depending on how severe the myocarditis is&#44; its treatment varies&#46; Usually&#44; a high dose of glucocorticoids &#40;methylprednisolone 1<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#41; is the main treatment&#44; but sometimes it is not enough&#46;</p><p id="par0065" class="elsevierStylePara elsevierViewall">For those with poor response to steroids&#44; other immunosuppressive drugs could be used&#44; such as immunoglobulin&#44; plasmapheresis&#44; mycophenolate mofetil&#44; tacrolimus and even infliximab&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">For early diagnosis of subclinical myocarditis&#44; serial laboratory tests&#44; ECG and TTE can be beneficial for patients treated with ICIs&#46; Out of all the laboratory markers&#44; troponin is generally the most sensitive marker for confirming or excluding the diagnosis of myocarditis&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">4</span></a></p><p id="par0075" class="elsevierStylePara elsevierViewall">However&#44; multi-institutional efforts are needed to understand the pathophysiology of myocarditis&#44; and a multipronged approach is needed to understand who is at risk of developing myocarditis&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Funding</span><p id="par0080" class="elsevierStylePara elsevierViewall">None&#46;</p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Conflict of interest</span><p id="par0085" class="elsevierStylePara elsevierViewall">The authors declare that there is no conflict of interest regarding the publication of this article&#46;</p></span></span>"
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Article information
ISSN: 00257753
Original language: English
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