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Letter to the Editor
Isolated Left Ventricular Noncompaction: Unusual Cause of Decompensated Heart Failure and Indication of Heart Transplantation in the Early Infancy - Case Report and Literature Review
Natasha Damásio Fairbanks Barbosa, Estela Azeka, Vera Demarchi Aiello, Fernanda Viana, Marcelo Jatene, Carla Tanamati, Miguel Barbero Marcial
Cardiology Unit, Heart Institute, Faculdade de Medicina da Universidade de São Paulo - São Paulo/SP, Brazil
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          "en" => "<p id="spara10" class="elsevierStyleSimplePara elsevierViewall">Gross aspect of the explanted heart&#44; showing the characteristic non-compaction involving the inlet and apical portion of the left ventricle but sparing the ventricular septum&#46;</p>"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="cesec10" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle10">INTRODUCTION</span><p id="para10" class="elsevierStylePara elsevierViewall">The isolated noncompaction of the left ventricle &#40;IVNC&#41; is a rare disease&#44; of which only about 100 cases have been reported so far&#46;<a class="elsevierStyleCrossRef" href="#bib1">1</a> The World Health Organization has categorized it as an unclassified cardiomyopathy&#46; It is supposedly the result of an arrest in the normal endomyocardial embryogenesis&#44; which leads to the persistence of intertrabecular recesses and the development of a spongy myocardium&#46;<a class="elsevierStyleCrossRef" href="#bib2">2</a> During normal intrauterine development&#44; the myocardium condenses and the intertrabecular recesses are reduced to capillaries<a class="elsevierStyleCrossRef" href="#bib1">1</a>&#46; IVNC is characterized by an excessively prominent trabecular meshwork of the myocardium and deep intertrabecular recesses due to the arrest in the compactation process of the myocardial fibers in the absence of other structural heart disease&#44;<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#44;<a class="elsevierStyleCrossRef" href="#bib4">4</a> Jenni et al<a class="elsevierStyleCrossRef" href="#bib5">5</a> defined the diagnostic echocardiographic criteria for IVNC and suggested that the World Health Organization classification of cardiomyopathies should consider including it as a distinct cardiomiopathy&#46; Recently&#44; it was recognized as a congenital cardiomyopathy&#46;<a class="elsevierStyleCrossRef" href="#bib6">6</a> Due to the rarity of the disease and to the difficulty of diagnosis&#44; we are reporting an infant with isolated left ventricular noncompaction who presented decompensated heart failure and was successfully submitted to heart transplantation&#46;</p></span><span id="cesec20" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle20">CASE DESCRIPTION</span><p id="para20" class="elsevierStylePara elsevierViewall">A female infant&#44; aged 10 months&#44; arrived at our hospital and was admitted with clinical signs of heart failure and a history of a previous admission at Intensive Care Unit for decompensated heart failure and cardiac arrest one month before&#46; She was born at term of healthy&#44; unrelated parents and was asymptomatic until the age of two months&#44; when she presented with shortness of breath&#44; poor appetite and weight loss&#46; She weighed 6&#46;8 Kg and was 75&#46;5 cm tall&#46; Cardiovascular examination revealed a decreased-volume peripheral pulse and a third heart sound&#46; There was also hepatomegaly&#44; 4 cm below the right costal margin&#46; No dysmorphic features were observed&#46; There was no sign of arrhythmia noted while awaiting transplantation&#46;</p><p id="para30" class="elsevierStylePara elsevierViewall">The patient evolved with refractory heart failure as a result of severely deteriorated left ventricular function and became a candidate for heart transplantation&#46; On admission&#44; the infant&#8217;s medications were aldactone 1&#46;5 mg&#47;kg&#47;day&#44; captopril 1&#46;5 mg&#47;kg&#47;day&#44; furosemide 3&#46;5 mg&#47;kg&#47;day and digoxin 10 mg&#47;kg&#47;day&#46;</p><p id="para40" class="elsevierStylePara elsevierViewall">During the pre-transplantation exams&#44; the chest X-ray revealed substantial cardiomegaly&#46; The electrocardiography showed left ventricular overload&#44; but no signs of ventricular arrhythmias&#46; The echocardiogram showed dilated cardiac chambers &#40;important enlargement of left atrium and left ventricle&#41;&#46; There was a severe left ventricular systolic dysfunction &#40;shortening fraction of 7&#46;3&#37;&#41; and a discrete left atrioventricular valve insufficiency&#44; with no signs of thrombosis&#46; The dimension of the septum and left ventricular wall was 6 mm thick&#46; Gallium-67 scintigraphy for myocardial inflammatory process was negative&#46; An endomyocardial biopsy revealed no evidence of myocarditis&#46; Cardiac catheterization showed a systolic pulmonary pressure of 28 mmHg&#44; diastolic pulmonary pressure of 18 mmHg&#44; mean pulmonary pressure of 21 mmHg&#44; capillary wedge pressure of 15 mmHg&#44; pulmonary vascular resistance index of 1&#46;8 Woods&#47;m<span class="elsevierStyleSup">2</span>&#46;</p><p id="para50" class="elsevierStylePara elsevierViewall">The patient underwent heart transplantation at the age of 1 year&#44; 37 days after having been listed&#46; The donor heart was from a 5-year-old boy who weighed 15 Kg and had suffered an acute head trauma&#46; During the immediate pos-operative period&#44; the patient evolved with right ventricle dysfunction but her condition improved after nitric oxide inhalation&#46; On the second day after surgery&#44; she was extu-bated and on the sixth day&#44; the vasoative drugs were discontinuated&#46; Sixteen days after surgery&#44; she was discharged in good clinical conditions&#44; and is now doing well&#44; two years and 10 months after transplantation&#46;</p><p id="para60" class="elsevierStylePara elsevierViewall">The pathology analysis of the explanted heart revealed ventricles with proeminent ventricular trabeculation and deep recesses&#44; involving the inlet and the apical portion&#46; The compact myocardium was thin &#40;3mm&#41; and endocardium showed diffuse thickening&#46; The ratio of thickness of noncompacted-to-compacted myocardium was 3&#46;3&#46; The septum was 8 mm thick and there was myocardial hypertrophy&#44; consistent with the diagnosis of dilated cardiomy-opathy with isolated noncompaction of the left ventricular myocardium or &#8220;spongy myocardium&#8221; &#40;<a class="elsevierStyleCrossRef" href="#fig1">Figure 1</a>&#41;&#46; Microscopically&#44; the deep recesses were lined by a thickened en-docardial layer and the myocardial fibers showed mild hypertrophy &#40;<a class="elsevierStyleCrossRef" href="#fig2">Figure 2</a>&#41;&#46; No inflammatory infiltrate was detected&#46;</p><elsevierMultimedia ident="fig1"></elsevierMultimedia><elsevierMultimedia ident="fig2"></elsevierMultimedia></span><span id="cesec30" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle30">DISCUSSION</span><p id="para70" class="elsevierStylePara elsevierViewall">During normal embryonic development&#44; endomyo-cardial trabeculations emerge from the apical region of the primitive ventricles at day 32 of fetal life&#44; and involute by day 70 through a process of reabsortion and remodeling&#46;<a class="elsevierStyleCrossRef" href="#bib7">7</a> Noncompaction is characterized by numerous&#44; prominent trabeculations and conspicuous intertrabecular recesses that penetrate deeply into the left ventricular myocardium&#44; a thin compacted ventricular free wall&#44; mainly in the affected areas&#44; and hypokinetic diffuse systolic dysfunction&#46;<a class="elsevierStyleCrossRef" href="#bib3">3</a> It should be distinguished from persistent intramyocardial sinusoids&#44; commonly seen in hearts with structural abnormality and intraventricular pressure overload such as with pulmonary atresia and intact ventricular septum&#46; These intramyocardial sinusoids are in continuity with the ventricular cavity and with the coronary arteries&#46;<a class="elsevierStyleCrossRef" href="#bib8">8</a></p><p id="para80" class="elsevierStylePara elsevierViewall">The thickened left ventricular wall consists of two zones of different structure&#46; The compacted epicardial layer appears as a compact band of uniform tissue while the much thicker endocardial non-compacted layer consists of trabecular meshwork with deep endomyocardial spaces surrounded by exaggerated hypertrophy of the trabeculae&#46; Although it must be emphasized that&#44; strictly speaking&#44; a two layered structure is found only in IVNC&#44; and not in left ventricular hypertrophy &#40;LVH&#41;&#44; dilated cardiomyopathy &#40;DCM&#41;&#44; or any other condition&#44; it may sometimes appear difficult to define where prominent trabeculation &#40;such as DCM&#41; ends and non-compactation begins&#46;<a class="elsevierStyleCrossRef" href="#bib5">5</a></p><p id="para90" class="elsevierStylePara elsevierViewall">The microscopical findings are non-specific and may comprise hypertrophy of cardiomyocytes and endocardial fibroelastosis&#46;</p><p id="para100" class="elsevierStylePara elsevierViewall">Clinical symptoms depend on the extent of noncompacted cardiac segments<a class="elsevierStyleCrossRef" href="#bib3">3</a>&#46; Most children with IVNC are asymptomatic on initial presentation and show gradual deterioration in left ventricular function with restrictive physiology&#46;<a class="elsevierStyleCrossRef" href="#bib3">3</a> In reports of predominantly symptomatic children&#44; heart failure and arrhythmia were prevalent&#46;<a class="elsevierStyleCrossRefs" href="#bib9">9-11</a> There also seems to be an increased incidence of ventricular arrhythmias in adults&#46;<a class="elsevierStyleCrossRef" href="#bib12">12</a>&#44;<a class="elsevierStyleCrossRef" href="#bib13">13</a> Systemic embolization is another major cause of severe&#44; often fatal complication&#46; In an adult population with IVNC&#44; Oeschslin et al<a class="elsevierStyleCrossRef" href="#bib13">13</a> reported four cases that required heart transplantation for end-stage cardiac failure&#46; Ichida et al<a class="elsevierStyleCrossRef" href="#bib3">3</a> reported 27 pediatric patients with IVNC but only 3 patients experienced progressive left ventricular dysfunction during a median follow-up of 6 years&#46; Two of these patients died and the other was a candidate for heart transplantation&#46; Neudorf et al<a class="elsevierStyleCrossRef" href="#bib10">10</a> reported 7 cases of IVNC in children&#44; but in only one transplantation was performed and Chin et al<a class="elsevierStyleCrossRef" href="#bib9">9</a> reported 8 patients in a single institution&#44; but none was candidate to heart transplantation&#46; Wald et al<a class="elsevierStyleCrossRef" href="#bib11">11</a> described 3 of 22 patients who became candidates for heart transplantation&#46; To our knowledge&#44; our case is the youngest infant with a clinical presentation of de-compensated heart failure to be successfully treated with heart transplantation&#46;</p><p id="para110" class="elsevierStylePara elsevierViewall">The cause of depressed ventricular function is not clear&#44; but it seems to be the result of a primary systolic and diastolic dysfunction of the left ventricle&#46; Systolic dysfunction is most probably the result of relative ischemia of the myocardium due to the mismatch of myocardial oxygen supply and demand&#46;<a class="elsevierStyleCrossRef" href="#bib14">14</a> The coronary arteries are normal in the affected patients&#46; Recently&#44; however restricted myocar-dial perfusion and decreased coronary flow reserve&#44; suggestive of a coronary microcirculatory dysfunction&#44; were demonstrated through positron emission tomography in patients with IVNC&#46;<a class="elsevierStyleCrossRef" href="#bib15">15</a>&#44;<a class="elsevierStyleCrossRef" href="#bib16">16</a> Decreased coronary flow reserve was not only confined to noncompacted segments&#44; but extended to most segments with wall motion abnormalities&#46;<a class="elsevierStyleCrossRef" href="#bib16">16</a> This finding suggests that coronary microcirculatory dysfunction may play a role in the development of impaired ventricular function&#46; Patients with depressed ventricular function may present signs of heart failure similar to those observed in patients with dilated cardiomyopathy&#44; and which were seen in this infant&#46;</p><p id="para120" class="elsevierStylePara elsevierViewall">IVNC can occur in sporadic and in familial patterns&#46; Familial cases have been reported&#44; where the mode of inheritance is heterogeneous&#46; In the X-linked form of the disease&#44; a locus has been found on Xq28&#44; and mutations have been reported in G4&#46;5 gene&#46;<a class="elsevierStyleCrossRef" href="#bib17">17</a>&#44;<a class="elsevierStyleCrossRef" href="#bib18">18</a> This genetic linkage is located close to other areas that have been associated with various other myopathies&#46; In our case&#44; a family history was excluded&#46;</p><p id="para130" class="elsevierStylePara elsevierViewall">The morphological criteria for the diagnosis of this entity remain the subject of debate and are usually based on the findings of the imaging studies&#46; Echocardiography is the diagnostic tool for IVNC&#44; however different echo-cardiographic criteria for IVNC are currently been used<a class="elsevierStyleCrossRef" href="#bib19">19</a>&#58; echocardiografic data that would help differentiate IVNC from idiopathic dilated cardiomyopathy &#40;IDC&#41; have not been fully described&#46; The depths of the recesses may be difficult to assess echocardiographically and might be dependent on the patient&#8217;s hemodynamic status<a class="elsevierStyleCrossRef" href="#bib19">19</a>&#46; Jenni et al<a class="elsevierStyleCrossRef" href="#bib5">5</a> have described diagnostic echocardiographic criteria for IVNC that include 1&#41; the absence of co-existing cardiac abnormalities&#59; 2&#41; a 2-layered structure of the ventricular wall with an end-systolic ratio of the noncompacted to the compacted layer &#62;2&#59; 3&#41; the finding of this morphologic presentation in apical and in mid-ventricular areas&#44; and 4&#41; direct blood flow from the ventricular cavity into the deep intertrabecular recesses&#44; as assessed by Doppler echo-cardiography&#46; Magnetic resonance imaging and myocardial perfusion scanning can be of additional help in detecting sub-endocardial perfusion defects&#46;<a class="elsevierStyleCrossRef" href="#bib20">20</a>&#44;<a class="elsevierStyleCrossRef" href="#bib21">21</a> A recent resonance magnetic study concluded that a ratio of non-compacted to compacted myocardium greater than 2&#46;3 would reliably the disease entity<a class="elsevierStyleCrossRef" href="#bib22">22</a>&#46; Ivan et al<a class="elsevierStyleCrossRef" href="#bib23">23</a> reported three cases where the diagnosis of ventricular non-compactation was not made by echocardiography&#44; but by cardiac magnetic resonance&#46; They suggest that the regular use of cardiac magnetic resonance may improve the detection rate of IVNC in patients with IDC&#46;</p><p id="para140" class="elsevierStylePara elsevierViewall">It should be however noted that in the case reported here&#44; echocardiography only showed a dilated left ventricle compatible with dilated cardiomyopathy and a severe left ventricle dysfunction&#46; The diagnosis of isolated noncompaction was only established on the explanted heart&#46; The microscopical findings are non-specific and may comprise hypertrophy of cardiomyocytes and endocardial fibroelastosis&#46; This finding demonstrates that the diagnosis of IVNC may be difficult before transplantation&#46; Sengupta et al<a class="elsevierStyleCrossRef" href="#bib24">24</a> reported that in symptomatic patients&#44; the differentiation of IVNC from other cardiomyopathies may be difficult&#46; Several cases of IDC have been shown to be IVNC at authopsy<a class="elsevierStyleCrossRef" href="#bib25">25</a>&#46;</p><p id="para150" class="elsevierStylePara elsevierViewall">Patients with noncompactation of the left myocardium reveal a poor outcome&#44; the mortality&#44; exceeding 35&#37; in adults&#44;<a class="elsevierStyleCrossRef" href="#bib12">12</a> and in children&#44; the mortality rate exceeded 22&#37; in a 7-year follow-up study<a class="elsevierStyleCrossRef" href="#bib26">26</a>&#46; The commonest causes of death are intractable heart failure and sudden cardiac death&#46;<a class="elsevierStyleCrossRef" href="#bib13">13</a></p><p id="para160" class="elsevierStylePara elsevierViewall">The management of patients with IVNC includes the treatment of congestive heart failure&#44; arrhythmias&#44; and thromboembolic events&#46; End-stage heart failure has been managed with heart transplantation&#44; as evidenced in our case&#46; A review of the literature identified only 9 patients with IVNC who underwent cardiac transplantation&#46;<a class="elsevierStyleCrossRef" href="#bib8">8</a>&#44; <a class="elsevierStyleCrossRef" href="#bib27">27</a> This infant is the youngest child reported with IVNC and clinical signs of decompensated heart failure to have been successfully treated with heart transplantation&#46;</p></span><span id="cesec40" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="cestitle40">CONCLUSION</span><p id="para170" class="elsevierStylePara elsevierViewall">Although a rare entity&#44; isolated ventricular noncompactation can lead to decompensated heart failure in the early infancy and may be successfully treated with heart transplantation&#46;</p></span></span>"
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Article information
ISSN: 18075932
Original language: English
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es en pt

¿Es usted profesional sanitario apto para prescribir o dispensar medicamentos?

Are you a health professional able to prescribe or dispense drugs?

Você é um profissional de saúde habilitado a prescrever ou dispensar medicamentos