- Case report
- Open Access
- Open Peer Review
Hypertrophic cardiomyopathy with midventricular obstruction and apical aneurysm formation in a single family: case report
© Efthimiadis et al; licensee BioMed Central Ltd. 2009
- Received: 08 June 2009
- Accepted: 16 June 2009
- Published: 16 June 2009
Hypertrophic cardiomyopathy (HCM) is an extremely heterogeneous disease. An under recognized and very often missed subgroup within this broad spectrum concerns patients with left ventricular (LV) apical aneurysms in the absence of coronary artery disease.
We describe a case of HCM with midventricular obstruction and apical aneurysm formation in 3 patients coming from a single family. This HCM pattern was detected by 2D-echocardiography and confirmed by cardiac magnetic resonance imaging. A cardioverter defibrillator was implanted in one of the patients because of non-sustained ventricular tachycardia detected in 24-h Holter monitoring and an abrupt drop in systolic blood pressure during maximal exercise test. The defibrillator activated 8 months after implantation by suppression of a ventricular tachycardia providing anti-tachycardia pacing. The patient died due to refractory heart failure 2 years after initial evaluation. The rest of the patients are stable after a 2.5-y follow-up period.
The detection of apical aneurysm by echocardiography in HCM patients may be complicated. Ventricular tachycardia arising from the scarred aneurysm wall may often occur predisposing to sudden death.
- Ventricular Tachycardia
- Hypertrophic Cardiomyopathy
- Left Ventricular Outflow Tract Obstruction
- Maximal Exercise Test
- Left Ventricular Apex
Hypertrophic cardiomyopathy (HCM) is an extremely heterogeneous disease, in terms of clinical course and phenotypic expression [1–3]. An under recognized and very often missed subgroup within this broad spectrum concerns patients with left ventricular (LV) apical aneurysms in the absence of coronary artery disease [4–10]. In this report we present a case-series of HCM patients with midventricular obstruction and apical aneurysm formation in a single family.
In this report we present a case of HCM with midventricular obstruction and apical aneurysm formation in 3 patients coming from a single family.
Isolated midventricular obstruction is an uncommon phenotype of HCM [7, 11]. The midcavity obstruction is due to the midsystolic muscular apposition of the septum and LV free wall producing distinct proximal and distal chambers, resembling an "hourglass" shape of LV. Maron MS et al reported that the formation of LV apex aneurysm in HCM accounts approximately for 2% of HCM population. The pattern of hypertrophy in such patients is that of midventricular obstruction in 68%, and that of apical hypertrophy in 32% of patients . Unfortunatelly, genotype analysis was not performed in our patients since it is not available in our laboratory. However, this disorder has been associated with mutations of the essential or regulatory light chains of myosin. These types of mutation are assumed to cause stretch activation response disrupt leading to midventricular obstruction .
The detection of apical aneurysms by echocardiography in HCM patients may be complex, if hypertrophy is confined to posterior septum, LV free wall, or to the apex. Furthermore, echocardiographist's experience, the quality of acoustic window and acquired images along with aneurysm's size play an important role in the aneurysm identification. According to a previous study, echocardiography identified only 57% of HCM patients having aneurysms, all of which were either medium or large . On the contrary cardiac MRI, showing a greater spatial resolution, proves to be 100% sensitive in revealing this entity [5, 13].
The mechanism responsible for the formation of apical aneurysms in HCM patients remains unresolved while several causes have been accused, such as increased LV wall stress as a result of midcavitary LV obstruction and elevated intracavitary systolic pressures, genetic predisposition and myocardial bridging of the left anterior descending coronary artery .
The formation of apical aneurysm in HCM represents a very serious clinical form of the disease. Very often, LV systolic function is depressed and thrombi may be developed inside the aneurysm leading to embolic events. Ventricular tachycardia arising from the scarred apical wall may also occur, predisposing to sudden death.
LV apical aneurysms affect up to 2% of the entire HCM population. Their detection using 2D echocardiography may be difficult. MRI imaging, on the contrary, shows 100% sensitivity in revealing them. The presentation of apical aneurysms in HCM patients is connected to serious complications including embolic events or even sudden death.
Written informed consent was obtained at first visit from all patients for publication of this case report and all accompanying images. A copy of the written consent is available for review by the Editor-in-Chief of this journal.
- Maron BJ: Hypertrophic cardiomyopathy: a systematic review. JAMA. 2002, 287: 1308-1320. 10.1001/jama.287.10.1308.PubMedGoogle Scholar
- Wigle ED, Rakowski H, Kimball BP, Williams WG: Hypertrophic cardiomyopathy: clinical spectrum and treatment. Circulation. 1995, 92: 1680-1692.View ArticlePubMedGoogle Scholar
- Klues HG, Schiffers A, Maron BJ: Phenotypic spectrum and patterns of left ventricular hypertrophy in hypertrophic cardiomyopathy: morphologic observations and significance as assessed by two-dimensional echocardiography in 600 patients. J Am Coll Cardiol. 1995, 26: 1699-1708. 10.1016/0735-1097(95)00390-8.View ArticlePubMedGoogle Scholar
- Alfonso F, Frenneaux MP, McKenna WJ: Clinical sustained uniform ventricular tachycardia in hypertrophic cardiomyopathy: association with left ventricular apical aneurysm. Br Heart J. 1989, 61: 178-181. 10.1136/hrt.61.2.178.View ArticlePubMedPubMed CentralGoogle Scholar
- Maron MS, Finley JJ, Bos JM, Hauser TH, Manning WJ, Haas TS, Lesser JR, Udelson JE, Ackerman MJ, Maron BJ: Prevalence, clinical significance, and natural history of left ventricular apical aneurysms in hypertrophic cardiomyopathy. Circulation. 2008, 118: 1541-1549. 10.1161/CIRCULATIONAHA.108.781401.View ArticlePubMedGoogle Scholar
- Zenovich AG, Lesser JR, Hanna CA, Maron BJ: Identical twins with hypertrophic cardiomyopathy and apical aneurysm. Am J Cardiol. 2006, 97: 1109-10.1016/j.amjcard.2005.10.059.View ArticlePubMedGoogle Scholar
- Fighali S, Krajcer Z, Edelman S, Leachman RD: Progression of hypertrophic cardiomyopathy into a hypokinetic left ventricle: higher incidence in patients with midventricular obstruction. J Am Coll Cardiol. 1987, 9: 288-294.View ArticlePubMedGoogle Scholar
- Matsubara K, Nakamura T, Kuribayashi T, Azuma A, Nakagawa M: Sustained cavity obliteration and apical aneurysm formation in apical hypertrophic cardiomyopathy. J Am Coll Cardiol. 2003, 42: 288-295. 10.1016/S0735-1097(03)00576-X.View ArticlePubMedGoogle Scholar
- Nakamura T, Matsubara K, Furukawa K, Azuma A, Sugihara H, Katsume H, Nakagawa M: Diastolic paradoxic jet flow in patients with hypertrophic cardiomyopathy: evidence of concealed apical asynergy with cavity obliteration. J Am Coll Cardiol. 1992, 19: 516-524.View ArticlePubMedGoogle Scholar
- Wigle ED, Rakowski H: Hypertrophic cardiomyopathy: when do you diagnose midventricular obstruction versus apical cavity obliteration with a small nonobliterated area at the apex of the left ventricle?. J Am Coll Cardiol. 1992, 19: 525-526.View ArticlePubMedGoogle Scholar
- Falicov RE, Resnekov L: Midventricular obstruction in hypertrophic obstructive cardiomyopathy. New diagnostic and therapeutic challenge. Br Heart J. 1977, 39: 701-705. 10.1136/hrt.39.7.701.View ArticlePubMedPubMed CentralGoogle Scholar
- Poetter K, Jiang H, Hassanzadeh S, Master SR, Chang A, Dalakas MC, Rayment I, Sellers JR, Fananapazir L, Epstein ND: Mutations in either the essential or regulatory light chains of myosin are associated with a rare myopathy in human heart and skeletal muscle. Nat Genet. 1996, 13 (1): 63-69. 10.1038/ng0596-63.View ArticlePubMedGoogle Scholar
- Moon JC, Fisher NG, McKenna WJ, Pennell DJ: Detection of apical hypertrophic cardiomyopathy by cardiovascular magnetic resonance in patients with non-diagnostic echocardiography. Heart. 2004, 90: 645-649. 10.1136/hrt.2003.014969.View ArticlePubMedPubMed CentralGoogle Scholar
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