[Cardiac manifestations of patients with mitochondrial disease].
OBJECTIVE
To analyze the cardiac manifestations of mitochondriopathy patients.


METHODS
We retrospectively analyzed the clinical (Electrocardiogram, Holter monitoring, echocardiogram and laboratory examinations) and pathological data of 90 mitochondriopathy patients diagnosed within recent 20 years. The cardiac involvement data from these patients were summarized.


RESULTS
Hypertrophic cardiomyopathy was found in 2 patients and dilated cardiomyopathy in 3 patients Mitochondriopathy diagnosis was made in 1 patient two years after heart transplantation due to heart failure resulting from previously diagnosed hypertrophic cardiomyopathy with noncompaction. The prevalence of cardiomyopathy is 5.6% (5/90). The prevalence of various arrhythmias was 22.2% (20/90). Four patients received permanent pacemaker because of Adams-Stokes attack or bradyarrhythmias (mitochondriopathy diagnosis was made 1-3 years post pacemaker implantation in 3 cases). History of syncope, respiratory failure, RBBB, atrial fibrillation and episodic ventricular tachyarrhythmias were presented in 1 patient with mitochondriopathy, another mitochondriopathy patient developed atrial tachyarrhythmias. Arrhythmia were present in 14 mitochondriopathy patients including RBBB, bifascicular block, intraventricular block, Wolff-Parkinson-White syndrome and short PR interval syndrome. The mtDNA 3243A-G mutation was detected in 8 patients.


CONCLUSIONS
Incidence of cardiomyopathy, heart failure and severe arrhythmias is high in patients with mitochondriopathy. Therefore, young cardiomyopathy patients with severe conduction block disorders should undergo relevant etiologic and genetic screening for mitochondriopathy and patients with diagnosed mitochondriopathy should regularly receive electrocardiogram and echocardiography examinations for possible cardiac involvement.
Department of Cardiology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing 100730, China.
Li-hua
LH
Zhang
Li-gang
LG
Fang
Zhong-wei
ZW
Cheng
Quan
Q
Fang
D000293:Adolescent; D000328:Adult; D000368:Aged; D002312:Cardiomyopathy, Hypertrophic / Q000175:diagnosis* / Q000209:etiology; D018376:Cardiovascular Abnormalities / Q000175:diagnosis* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D005260:Female; D006327:Heart Block / Q000175:diagnosis / Q000209:etiology; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D028361:Mitochondrial Diseases / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D011379:Prognosis; D012189:Retrospective Studies; D055815:Young Adult