BAV

BAV
Name	BAV
Field	Cardiology

BAV is a congenital cardiac condition characterized by an aortic valve with two functional leaflets instead of the usual three. It is an important cause of aortic valve dysfunction and aortopathy in adolescents and adults, with implications across cardiology, cardiothoracic surgery, and medical genetics. The condition intersects with clinical practice in settings such as tertiary cardiac centers, inherited cardiovascular disease clinics, and population screening programs.

Terminology and abbreviations

The condition is described using several clinical and imaging terms encountered in literature from institutions like Mayo Clinic, Cleveland Clinic, Johns Hopkins Hospital, and professional societies such as the American Heart Association and the European Society of Cardiology. Common abbreviations used by clinicians include AS for aortic stenosis, AR for aortic regurgitation, TAVR for transcatheter aortic valve replacement as performed at centers like Mount Sinai Hospital and Massachusetts General Hospital, and SAVR for surgical aortic valve replacement, often undertaken at programs such as Baylor College of Medicine and Stanford Health Care. Terms for related aortic pathology include ascending aortic aneurysm, often discussed in contexts linked to Society of Thoracic Surgeons guidelines and reports from registries like the National Cardiovascular Data Registry.

Anatomy and types

Anatomically the condition concerns the aortic valve apparatus within the aortic root, including the sinuses of Valsalva, the sinotubular junction, and the ascending aorta—structures described in texts from Gray's Anatomy and operative manuals used at Cleveland Clinic. Morphologic classification divides cases into types based on cusp fusion patterns and raphe presence, categories referenced in surgical series from Mayo Clinic and classification proposals from the European Association for Cardiovascular Imaging. Typical anatomic variants include right-left cusp fusion, right-noncoronary fusion, and left-noncoronary fusion; these patterns are documented in echocardiography cohorts at Mount Sinai Hospital and cohort studies from University of Oxford. Associated aortopathy affects the ascending aorta and may involve the aortic root, an area evaluated by vascular surgery teams at institutions like Johns Hopkins Hospital.

Epidemiology and genetics

Epidemiologic estimates derive from population studies including cohorts at Framingham Heart Study and screening programs in Europe and North America; prevalence estimates often appear in reports from World Health Organization-linked cardiovascular surveillance. The condition shows higher prevalence in males and familial clustering reported by genetic centers such as those at University of Pennsylvania and Columbia University Irving Medical Center. Genetic contributions involve variants in genes studied at institutions like Harvard Medical School and Broad Institute; candidate loci include genes implicated in connective tissue and valvulogenesis identified in consortiums such as the Cardiovascular Research Consortium. Familial screening protocols and cascade testing principles are guided by recommendations from bodies like the European Society of Cardiology and national genetics services at National Institutes of Health.

Pathophysiology and clinical manifestations

Pathophysiology combines altered valvular biomechanics, extracellular matrix remodeling, and shear stress-induced signaling observed in basic science labs at National Institutes of Health and university research groups at Johns Hopkins School of Medicine. Progressive leaflet calcification can lead to obstructive physiology manifested as aortic stenosis, while cusp malcoaptation results in aortic regurgitation; both presentations are described in clinical practice guidelines from the American College of Cardiology and case series from Mayo Clinic. Associated aortopathy predisposes to dilation, aneurysm formation, and dissection—complications profiled in surgical literature from Cleveland Clinic and referral centers such as Toronto General Hospital. Symptoms include exertional dyspnea, chest pain, syncope, and heart failure signs, commonly evaluated in emergency departments of institutions like Royal Brompton Hospital and Guy's and St Thomas' NHS Foundation Trust.

Diagnosis and imaging

Diagnosis relies on multimodality imaging used at specialist centers such as Mayo Clinic, Mount Sinai Hospital, and Royal Brompton Hospital. Transthoracic echocardiography is first-line, with transesophageal echocardiography and three-dimensional echocardiography providing detailed valve morphology, techniques refined in echocardiography laboratories at European Association for Cardio-Thoracic Anaesthesiology training centers. Cardiac magnetic resonance imaging and computed tomography angiography, routinely performed at Massachusetts General Hospital and Stanford Health Care, assess the aortic dimensions, valve orifice area, and flow patterns. Imaging protocols follow standards published by the American Society of Echocardiography and the Society of Cardiovascular Computed Tomography.

Management and treatment

Management spans medical surveillance, pharmacologic strategies, and invasive interventions provided by multidisciplinary teams at centers like Cleveland Clinic and Baylor St. Luke's Medical Center. Surveillance intervals and surgical thresholds for aortic repair are informed by guidelines from the American College of Cardiology and the European Society of Cardiology, with elective repair offered at high-volume institutions such as Toronto General Hospital. Valve interventions include SAVR with mechanical or tissue prostheses and valve-sparing root replacement techniques developed at Cleveland Clinic and University of Pennsylvania, and TAVR approaches applied in select patients at Johns Hopkins Hospital and Massachusetts General Hospital. Medical therapy targets blood pressure control and risk factor modification following recommendations from National Institute for Health and Care Excellence and pharmacology trials reported through Cochrane reviews.

Prognosis and complications

Prognosis depends on valve dysfunction severity, aortic dimensions, and comorbidities recorded in longitudinal registries like the Society of Thoracic Surgeons database. Major complications include progressive aortic stenosis, aortic regurgitation, ascending aortic aneurysm, and aortic dissection, outcomes documented in cohort analyses from Mayo Clinic and population registries such as the Framingham Heart Study. Long-term outcomes after surgical or transcatheter intervention are reported by high-volume centers including Massachusetts General Hospital and Cleveland Clinic, which inform shared decision-making at tertiary referral centers like Johns Hopkins Hospital.

Category:Cardiology