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Quadricuspid aortic valve not discovered by transthoracic echocardiography
© Dencker and Stagmo; licensee BioMed Central Ltd. 2006
Received: 17 October 2006
Accepted: 07 November 2006
Published: 07 November 2006
Quadricuspid aortic valve is a rare congenital heart defect. Several different anatomical variations of a quadricuspid aortic valve has been described and aortic regurgitation is the predominant valvular dysfunction associated with quadricuspid aortic valve.
A 68-year-old woman presented with almost a years history of increasing dyspnoea on exertion. The patient have had two previous transthoracic echocardiographic exams in the last six years and they had only documented moderate aortic regurgitation. Transoesophageal echocardiography displayed a rare case of quadricuspid aortic valve with three cusps of equal size and one larger cusp. The malformation was associated with severe aortic regurgitation.
Liberal use of transoesophageal echocardiography is often warranted if optimal display of valvular morphology is desired.
Knowledge of the existence of quadricuspid aortic valve is not new, the first reported case dates back to 1862 . The incidence from autopsy studies matches that detected by echocardiography, around 0.01%, with a slight male predominance . Hurwitz and Roberts introduced a classification nomenclature for quadricuspid aortic valve that included 7 different types named A to G . The type described in this case report, with three equal cusps and one larger, is type E and extremely rare. Tutarel published the most comprehensive review of the literature concerning quadricuspid aortic valve, in 2004 . This review included 186 cases of quadricuspid aortic valve and only 4 was designated type E . Aortic regurgitation is the predominant valvular dysfunction and is seen in up to 75% of documented cases, on the other hand, quadricuspid aortic valve is rarely associated with aortic stenosis . The most prevalent other cardiac malformation associated with quadricuspid aortic valve was anomalies of the coronary arteries, which have been reported in 10% of the cases . Other malformation associated with quadricuspid aortic valve include stenosis of pulmonic valve, nonobstructive cardiomyopathy, subaortic stenosis, and ventricular septal defect [8, 9]. Also, cases of bacterial endocarditis affecting a quadricuspid aortic valve have been reported [2, 3].
The prevalence of quadricuspid aortic valve is to low to study the diagnostic accuracy of transthoracic versus transoesophageal echocardiography in the detection of this malformation. A recent study by Alegret and co-workers concerning bicuspid aortic valve morphology gives an hint to what might be the case . Alegret et al investigated 59 selected patients and 15 out of 32 bicuspid aortic valves were missed on transthoracic, but detected on transoesophageal echocardiography .
Noteworthy is that two consecutive transthoracic echocardiographic exams had fail to document the quadricuspid aortic valve and this is one more example that liberal use of transoesophageal echocardiography is often warranted if optimal display of valvular morphology is desired. Also, the increasing use of transoesophageal echocardiography will probably lead to an increase in the detection of quadricuspid aortic valve. It is therefore of importance to know this anomaly and its associated defects.
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