Double-Chambered Right Ventricle

No Results

No Results

processing….

Like many other lesions associated with congenital heart disease (CHD), the terminology that surrounds double-chambered right ventricle (DCRV) has evolved over the past several decades. Double-chambered right ventricle was originally described more than 130 years ago. Clinical series began describing it extensively in the 1960s.

Double-chambered right ventricle is better understood as a form of septated right ventricle (RV) caused by the presence of abnormally located or hypertrophied muscular bands.

The abnormally located or hypertrophied muscle bundles divide the RV cavity into a proximal and a distal chamber. Those muscle bundles run between an area located in the ventricular septum, beneath the level of the septal leaflet of the tricuspid valve, and the anterior wall of the RV. Frequent associated lesions include ventricular septal defect (VSD), pulmonary valve stenosis, and discrete subaortic stenosis.

As outlined by Restivo et al, several subtypes of divided RV are noted. [1] These subtypes include anomalous septoparietal band, anomalous apical shelf, hypertrophy of apical trabeculations, anomalous apical shelf with Ebstein malformation, and sequestration of the outlet portion of the ventricle from a circumferential muscular diaphragm in patients with tetralogy of Fallot. Double-chambered right ventricle, the most common form, is noted by the presence of anomalous muscle bundles (AMB) that divide the RV into 2 chambers. However, no uniformity is observed in the position of these anomalous muscle bundles or in the manner in which the RV is divided.

See the images below.

For patient education resources, see Heart Health Center as well as Tetralogy of Fallot.

Anomalous muscle bundles divide the RV into a high-pressure proximal chamber and a lower-pressure distal chamber. Evidence suggests that double-chambered right ventricle is an acquired disorder in those patients with appropriate substrate. Obstruction to pulmonary blood flow usually progresses with hypertrophy of the muscle and further obliteration of the RV cavity, although cases without progression of obstruction and even of spontaneous regression have been described.

The origin of anomalous muscle bands has been debated. The embryologic basis for double-chambered right ventricle was attributed to failure to incorporate bulbus cordis into the RV or an elevated hypertrophied moderator band. However, Byrum et al used the pattern of electrical activation to determine that muscle bundles were not the result of a displaced moderator band and suggested that activation of the double-chambered right ventricle is similar to activation of the normal heart. [2] Others, however, concluded that both the presence of bundle branch block in some patients and detection of a portion of the right bundle branch in a pathologic sample of the muscle bundle have proven the hypothesis that the moderator band is, in fact, the obstructing bundle.

A contemporary analysis of the origin of the muscle bundles determined the muscular shelf originates from the body of the septomarginal trabeculation. Two positions of muscle bundles are described as high (or horizontal) position and low (or oblique) position. Either position of the shelf divides the apical trabeculated RV in 2. This same analysis determined that the normal moderator band widely varies and that the anomalous muscle bundles do not represent an early takeoff from the moderator band in most cases. In a review of surgical cases, 45% of cases had more than one or nondiscrete muscle bundles. [3]

Muscle bundles and the RV itself are usually lined with thickened endothelium. Other, less common, forms of divided RV include those in which a fibromuscular diaphragm or atrioventricular valve tissue partition the RV. These other forms include the anomalous septoparietal band, anomalous apical shelf, hypertrophy of apical trabeculations, anomalous apical shelf with Ebstein malformation, and sequestration of the outlet portion of the ventricle from a circumferential muscular diaphragm in patients with tetralogy of Fallot. These forms are not discussed in this article.

Associated defects are present in approximately 80-90% of patients; a VSD that involves the membranous septum is the most common defect described. A VSD may communicate with either the proximal or distal chamber, leading to a greater shunt in the latter situation. Development of RV outflow tract obstruction occurs in 3-7% of patients with membranous VSDs within the first years of life. The mechanism responsible for acquired RV obstruction may be progressive hypertrophy and obstruction from anomalous RV muscle bundles.

A well-known relationship is described among patients with RV outflow tract obstruction, membranous VSD, and subaortic stenosis. Vogel et al described 36 patients with membranous VSD and double-chambered right ventricle, 88% of whom had echocardiographic evidence of subaortic stenosis, with evidence of progressive left ventricular outflow tract obstruction. [4] Progression of subaortic stenosis may occur before or after VSD closure and/or muscle bundles are resected.

The next most common associated lesion is pulmonary valve stenosis. Various other associations have been reported, including double outlet RV, tetralogy of Fallot, anomalous pulmonary venous drainage, complete or corrected transposition of great arteries, pulmonary atresia with intact ventricular septum, and Ebstein anomaly. Double-chambered right ventricle has also been reported in patients with Down syndrome and Noonan syndrome, although differentiation from hypertrophic cardiomyopathy in the latter group is not straightforward.

Although Rowland et al considered patients in 4 groups, based on predominant physiology (pulmonary stenosis, tetralogy of Fallot, large VSD with left-to-right shunt, double-chambered right ventricle associated with other more hemodynamically significant lesions), most patients have moderate-to-restrictive VSD. [5] Most of the remaining patients present with tetralogy physiology or have significant associated lesions.

Natural history varies depending on the presence of associated lesions. Progressive obstruction of the RV outflow tract has been observed and can lead to RV failure, especially in the presence of a VSD. Several report diagnosis in asymptomatic adults in whom anomalous muscle bundles and intact ventricular septum may have been associated with a VSD that underwent spontaneous closure.

International

Double-chambered right ventricle is relatively rare as an isolated anomaly; a large pediatric center typically diagnoses fewer than 10 cases per year. The lesion makes up approximately 0.5-2% of CHD and occurs in as many as 10% of patients with VSD.

Male-to-female ratio is 2:1.

Presentation can be as early as the newborn period; however, mean age at diagnosis is in early childhood. Both fetal and adult cases have been reported.

Restivo A, Cameron AH, Anderson RH, Allwork SP. Divided right ventricle: a review of its anatomical varieties. Pediatr Cardiol. 1984 Jul-Sep. 5(3):197-204. [Medline].

Byrum CJ, Dick M 2nd, Behrendt DM, et al. Excitation of the double chamber right ventricle: electrophysiologic and anatomic correlation. Am J Cardiol. 1982 Apr 1. 49(5):1254-8. [Medline].

Hubail ZJ, Ramaciotti C. Spatial relationship between the ventricular septal defect and the anomalous muscle bundle in a double-chambered right ventricle. Congenit Heart Dis. 2007 Nov. 2(6):421-3. [Medline].

Vogel M, Smallhorn JF, Freedom RM, et al. An echocardiographic study of the association of ventricular septal defect and right ventricular muscle bundles with a fixed subaortic abnormality. Am J Cardiol. 1988 Apr 1. 61(10):857-60. [Medline].

Rowland TW, Rosenthal A, Castaneda AR. Double-chamber right ventricle: experience with 17 cases. Am Heart J. 1975 Apr. 89(4):455-62. [Medline].

Goitein KJ, Neches WH, Park SC, et al. Electrocardiogram in double chamber right ventricle. Am J Cardiol. 1980 Mar. 45(3):604-8. [Medline].

Wong PC, Sanders SP, Jonas RA, et al. Pulmonary valve-moderator band distance and association with development of double-chambered right ventricle. Am J Cardiol. 1991 Dec 15. 68(17):1681-6. [Medline].

Amano M, Izumi C, Hayama Y, et al. Surgical Outcomes and Postoperative Prognosis Beyond 10 Years for Double-Chambered Right Ventricle. Am J Cardiol. 2015 Nov 1. 116 (9):1431-5. [Medline].

Kahr PC, Alonso-Gonzalez R, Kempny A, et al. Long-term natural history and postoperative outcome of double-chambered right ventricle–experience from two tertiary adult congenital heart centres and review of the literature. Int J Cardiol. 2014 Jul 1. 174 (3):662-8. [Medline].

Tsuchikane E, Kobayashi T, Kirino M, et al. Percutaneous myocardial ablation in double-chamber right ventricle. Catheter Cardiovasc Interv. 2000 Jan. 49(1):97-101. [Medline].

[Guideline] Maron BJ, Chaitman BR, Ackerman MJ, et al. Recommendations for physical activity and recreational sports participation for young patients with genetic cardiovascular diseases. Circulation. 2004 Jun 8. 109(22):2807-16. [Medline].

Telagh R, Alexi-Meskishvili V, Hetzer R, Lange PE, Berger F, Abdul-Khaliq H. Initial clinical manifestations and mid- and long-term results after surgical repair of double-chambered right ventricle in children and adults. Cardiol Young. 2008 Jun. 18(3):268-74. [Medline].

Alva C, Ho SY, Lincoln CR, et al. The nature of the obstructive muscular bundles in double-chambered right ventricle. J Thorac Cardiovasc Surg. 1999 Jun. 117(6):1180-9. [Medline].

Ceyran H, Narin N, Tasdemir K, et al. Double-chambered right ventricle mimicking asymmetric septal hypertrophy. Turk J Pediatr. 2003 Jan-Mar. 45(1):80-2. [Medline].

Freedom RM, Mawson JB, Yoo SJ. The divided right ventricle: anomalous right ventricular muscle bundles and other entities. Congenital Heart Disease: Textbook of angiocardiography. Futura Publishing Company, Inc; 1997. 389-407.

Hoffman P, Wojcik AW, Rozanski J, et al. The role of echocardiography in diagnosing double chambered right ventriclein adults. Heart. 2004 Jul. 90(7):789-93. [Medline]. [Full Text].

Kurosawa H, Becker AE. Surgical anatomy of the atrioventricular conduction bundle in anomalous muscle bundle of the right ventricle with subarterial ventricular septal defect. Pediatr Cardiol. 1985. 6(3):157-60. [Medline].

Kveselis D, Rosenthal A, Ferguson P, et al. Long-term prognosis after repair of double-chamber right ventricle with ventricular septal defect. Am J Cardiol. 1984 Dec 1. 54(10):1292-5. [Medline].

Nagashima M, Tomino T, Satoh H, et al. Double-chambered right ventricle in adulthood. Asian Cardiovasc Thorac Ann. 2005 Jun. 13(2):127-30. [Medline].

Penkoske PA, Duncan N, Collins-Nakai RL. Surgical repair of double-chambered right ventricle with or without ventriculotomy. J Thorac Cardiovasc Surg. 1987 Mar. 93(3):385-93. [Medline].

Pongiglione G, Freedom RM, Cook D, Rowe RD. Mechanism of acquired right ventricular outflow tract obstruction in patients with ventricular septal defect: an angiocardiographic study. Am J Cardiol. 1982 Oct. 50(4):776-80. [Medline].

Puvaneswary M, Indira N, Sreedhar M, Barooah B. Double-chambered right ventricle: magnetic resonance imaging findings. Australas Radiol. 2005 Apr. 49(2):170-4. [Medline].

Vogel M, Freedom RM, Brand A, et al. Ventricular septal defect and subaortic stenosis: an analysis of 41 patients. Am J Cardiol. 1983 Dec 1. 52(10):1258-63. [Medline].

Shubhayan Sanatani, MD Head, Division of Cardiology, Professor, Department of Pediatrics, University of British Columbia Faculty of Medicine; Medical Director, Children’s Heart Centre, Section Head, Heart Rhythm Service, British Columbia Children’s Hospital, Canada

Shubhayan Sanatani, MD is a member of the following medical societies: British Columbia Medical Association, Canadian Cardiovascular Society, Canadian Heart Rhythm Society, Canadian Medical Association, Royal College of Physicians and Surgeons of Canada

Disclosure: Serve(d) as a director, officer, partner, employee, advisor, consultant or trustee for: Audentes Therapeutics.

Mary L Windle, PharmD Adjunct Associate Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Nothing to disclose.

Julian M Stewart, MD, PhD Associate Chairman of Pediatrics, Director, Center for Hypotension, Westchester Medical Center; Professor of Pediatrics and Physiology, New York Medical College

Julian M Stewart, MD, PhD is a member of the following medical societies: American Academy of Pediatrics, American Autonomic Society, American Physiological Society

Disclosure: Received research grant from: Lundbeck Pharmaceuticals<br/>Received grant/research funds from Lundbeck Pharmaceuticals for none.

Stuart Berger, MD Executive Director of The Heart Center, Interim Division Chief of Pediatric Cardiology, Lurie Childrens Hospital; Professor, Department of Pediatrics, Northwestern University, The Feinberg School of Medicine

Stuart Berger, MD is a member of the following medical societies: American Academy of Pediatrics, American College of Cardiology, American College of Chest Physicians, American Heart Association, Society for Cardiovascular Angiography and Interventions

Disclosure: Nothing to disclose.

Juan Carlos Alejos, MD Clinical Professor, Department of Pediatrics, Division of Cardiology, University of California, Los Angeles, David Geffen School of Medicine

Juan Carlos Alejos, MD is a member of the following medical societies: American Academy of Pediatrics, American College of Cardiology, American Heart Association, American Medical Association, International Society for Heart and Lung Transplantation

Disclosure: Received honoraria from Actelion for speaking and teaching.

Alejandro R Peirone, MD Head, Section of Pediatric Cardiology, Hospital Privado de Cordoba; Consulting Staff, Division of Pediatric Cardiology, Hospital Espanol Medical Plaza and Children’s Hospital of Cordoba

Disclosure: Nothing to disclose.

Double-Chambered Right Ventricle

Research & References of Double-Chambered Right Ventricle|A&C Accounting And Tax Services
Source