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Right ventricular obstructive hypertrophic cardiomyopathy in primary myo-adenylate deaminase deficiency.
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PMID:  21842595     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
MyoAdenylate Deaminase Deficiency (MADD) is a relatively common metabolic disorder of the skeletal muscle. Patients with MADD usually show an impaired bioenergetic production and a clinical spectrum with either exercise-induced muscle pain, fatigue and/or rhabdomyolysis. Left ventricular hypertrophy as well as other types of cardiac involvement have been reported in patients with primary MADD. We describe herein a case of a 61-year-old woman with biochemical and genetic evidence of Myo-Adenylate Deaminase deficiency, in whom we found a right ventricular hypertrophic cardiomyopathy leading to severe outflow tract dynamic obstruction.
Authors:
C de Gregorio; G Morabito; O Musumeci; R Donato; A Toscano
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Publication Detail:
Type:  Case Reports; Journal Article    
Journal Detail:
Title:  Acta myologica : myopathies and cardiomyopathies : official journal of the Mediterranean Society of Myology / edited by the Gaetano Conte Academy for the study of striated muscle diseases     Volume:  30     ISSN:  1128-2460     ISO Abbreviation:  Acta Myol     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-08-16     Completed Date:  2011-09-16     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  9811169     Medline TA:  Acta Myol     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  46-8     Citation Subset:  IM    
Affiliation:
Clinical and Experimental Department of Medicine and Pharmacology, Messina University Hospital, Messina, Italy. cdegregorio@unime.it
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MeSH Terms
Descriptor/Qualifier:
AMP Deaminase / deficiency*
Cardiomyopathy, Hypertrophic / enzymology*,  physiopathology,  ultrasonography
Echocardiography
Electrocardiography
Female
Humans
Hypertrophy, Right Ventricular / complications,  enzymology*,  physiopathology,  ultrasonography
Middle Aged
Ventricular Outflow Obstruction / etiology*
Chemical
Reg. No./Substance:
EC 3.5.4.6/AMP Deaminase
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Full Text
Journal Information
Journal ID (nlm-ta): Acta Myol
Journal ID (publisher-id): Pacini
ISSN: 1128-2460
ISSN: 1128-2460
Publisher: Pacini Editore SpA
Article Information
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The journal and the individual contributions contained in it are protected by the copyright of Gaetano Conte Academy, Naples, Italy
open-access:
Print publication date: Month: 7 Year: 2011
Volume: 30 Issue: 1
First Page: 46 Last Page: 48
ID: 3185826
PubMed Id: 21842595
Publisher Id: Pacini

Right ventricular obstructive hypertrophic cardiomyopathy in primary Myo-Adenylate Deaminase Deficiency
C. DE GREGORIO
G. MORABITO
O. MUSUMECI1
R. DONATO2
A. TOSCANO1
Clinical and Experimental Department of Medicine and Pharmacology;
1 Department of Neurosciences, Psichiatry and Anesthesiology;
2 Department of Radiological Sciences, Messina University Hospital, Messina, Italy
Correspondence: Address for correspondence: Cesare de Gregorio, Dipartimento Clinico-Sperimentale di Medicina e Farmacologia, Unità Operativa di Cardiologia, Policlinico Universitario di Messina, viale Gazzi, 98125 Messina, Italy. Tel/Fax +39 090 2213531. E-mail: cdegregorio@unime.it; cesaredegregorio@tiscali.it

Introduction

Myo-Adenylate Deaminase deficiency (MADD) is a relatively common metabolic disorder of the skeletal muscle firstly described in 1978 (1). The enzyme is one of the most active in the purine nucleotide cycle, playing the adenosine-5-monophosphate deamination and maintaining the high adenosine-5-triphosphate/-diphosphate/- monophosphate ratio necessary for the bionergetic metabolism of the working muscle.

Because of the variety of genetic expression of such mutant alleles, the syndrome ranges from asymptomatic carriers to patients showing exercise-induced muscle pain, fatigue, intolerance to exercise, and/or rhabdomyolysis (rare) (2-6).

A morphofunctional involvement of the left ventricle (LV, left ventricular), chiefly consisting of myocardial hypertrophy or hypertrabeculation (HT), has been described in some MADD patients (7, 8).

We report a peculiar case of right ventricular (RV, right ventricle) hypertrophic cardiomyopathy leading to severe dynamic obstruction across the outflow tract.


Case report

A 61-year-old woman presented with a long-lasting history of diffuse myalgias, cramps at lower limbs, fatigue and exercise intolerance. Her family history was unremarkable for neuromuscular disorders, heart diseases and conventional cardiovascular risk factors.

Neurological examination showed mild proximal muscle weakness, more pronounced at lower limbs. Laboratory measurements showed mild CK elevation (397 U/l; reference range, < 200 U/l). Electromyography was unremarkable, whereas muscle biopsy revealed unspecific morphological alterations, but totally absent histochemical staining for MAD. Biochemical study on muscle homogenate also evidenced a virtual absence of MAD activity. Analysis of adenosin-monophosphate-deaminase 1 (AMPD-1) gene identified the common mutation C34T in an homozygous state, which confirmed the diagnosis of MADD.

As routinely scheduled in our neuromuscular patients, she was referred to the cardiology department for heart evaluation.

Physical examination revealed resting heart rate of 75 bpm and sitting blood pressure of 135/80 mm Hg. Intense systolic murmur (Levine grade 4) was electively heard on the pulmonary valve.

Resting ECG (Fig. 1) revealed sinus rhythm (75 bpm), normal atrio-ventricular conduction time (180 ms), right bundle branch block (QRS duration < 120 ms), high S-wave voltage in leads V4-5 and negative T-waves in leads V1-5, with no serious arrhythmias at 24-hour ECG monitoring.

Transthoracic echocardiography showed normal LV morphofunctional indices at rest, but concentric RV hypertrophy (free-wall diastolic thickness 8 mm). Global systolic function was preserved (ejection fraction ≥ 0.60) in both ventricles, with normal fractional shortening. Tricuspid and mitral annulus plane systolic excursion were 20 and 17 mm, respectively. Possible endomyocardial HT was seen in the RV outflow tract (Fig. 2, A-B) to be associated to a muscular obstruction leading to severe dynamic gradient throughout the outflow tract (peak value 60-70 mm Hg) (Fig. 2, C-D).

The patient underwent gadolinium-enhanced cardiac magnetic resonance imaging (MRI), which confirmed the RV free wall hypertrophy, but also demonstrated a giant moderator band, both leading to outflow tract occlusion (Fig. 2, E-F). No signs of RV dysplasia or delay enhancement were recognized.


Discussion

This report shows a novel RV disease in a MADD patient, chiefly consisting with severe hypertrophy of the free wall and the moderator band. These morphofunctional findings may be similar to those from patients with RV arrhythmogenic dysplasia, but the lack of specific MRI findings, delay enhancement, typical premature ventricular beats, epsilon potentials at ECG and myocardial vacuolations allowed us to exclude that cardiomyopathy (9, 10).

Interestingly, prominent trabeculations into the RV, like in our patient, are quite hard to be interpreted properly. In fact, due to its irregular structure, the diagnosis of RV-HT is challenging. The criteria proposed by Jenni et al. (11) and Stollberger et al. (12) for LV-HT barely apply to the RV. As recently emphasized by Limongelli et al. (13) multiple or exaggerated trabeculations can be a normal variant of the RV, and there is no chance for both echocardiography and cardiac MRI to discriminate between the two conditions. Nevertheless, RV-HT has been described in neonatal decompensated hearts (14, 15).

The severe RV dynamic obstruction is of clinical concern because of: a) its influence on patient's symptoms (fatigue, breathlessness), b) few chances of reducing the gradient noninvasively.

In conclusion, although genetic relationships between neurological and cardiological features are not well defined, this report confirms the need for a comprehensive investigation of the heart in MADD patients, bearing in mind that the above described symptoms could be the consequence of undervalued heart failure.


Acknowledgements

The Authors are grateful to Dr. Gianluca Di Bella for his comments on cardiac magnetic resonance findings.


References
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2.. Kar NC,Pearson CM. Muscle adenylate deaminase deficiency: report of six new casesArch NeurolYear: 1981382792817224911
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5.. Toscano A,Aguennouz M,Monici MC,et al. Myoadenilate deaminase deficiency: clinical, histochemical and biochemical studies in primary and "coincidental" casesItal J BiochemYear: 199746S170174
6.. Mercelis R,Martin JJ,Barsy T,et al. Myoadenylate deaminase deficiency: absence of correlation with exercise intolerance in 452 muscle biopsiesJ NeurolYear: 19872343853893655841
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13.. Limongelli G,Pacileo G,Calabrò P,et al. Right ventricular hypertrabeculation associated with double-outlet left ventricle: exaggeration of a normal pattern or right ventricular cardiomyopathy?J Cardiovasc MedYear: 201011193195
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Figures

[Figure ID: F1]
Figure 1. 

Twelve-lead resting electrocardiogram.



[Figure ID: F2]
Figure 2. 

Ultrasound imaging of the right ventricular hypertrophy and hypertrabeculation (panels A and B) causing severe dynamic obstruction through the outflow tract (panels C and D). Panels E and F show cardiac magnetic resonance imaging in diastole and systole, respectively. Note the hypertrophy of the basal RV free wall and of the moderator band (arrows), both leading to a virtual systolic chamber with outflow tract obliteration. LA, left atrium; LV, left ventricle; RA, right atrium, RV, right ventricle.



Article Categories:
  • Original Articles

Keywords: Key words Echocardiography, Myo-Adenylate Deaminase deficiency, neuromuscular disorders, right ventricular disease, right ventricular hypertrabeculation, right ventricular hypertrophic cardiomyopathy.

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