Overview
Rheumatic aortic valve obstruction refers to significant narrowing or obstruction of the aortic valve, often complicating previous surgical interventions, leading to hemodynamic compromise and reduced cardiac output 13.Diagnosis
Clinical Presentation: Hypotension, diminished pulses, and signs of heart failure 3.
Diagnostic Tests: Echocardiography for gradient assessment and valve morphology 13.
Invasive Monitoring: Catheterization to measure peak systolic gradient across the aortic valve 1.
Operative Diagnosis: Often discovered intraoperatively, particularly during procedures involving profound hypothermia and circulatory arrest 3.Management
Balloon Dilation Angioplasty (BDA): First-line treatment for postoperative aortic obstructions, effective in 90% of cases when lesion diameter is ≤8 mm 1.
Surgical Revascularization: For complex or refractory cases, including prosthetic bypass in cases of complete abdominal aortic obstruction 2.
Thermoregulation: Use of profound hypothermia with circulatory arrest may aid in diagnosing silent obstructions during cardiac surgery 3.Special Populations
Pediatrics: BDA effective across a wide age range, from infants to adolescents 1.
Comorbidities: Silent obstructions may complicate procedures involving normothermic cardiopulmonary bypass, especially with femoral artery cannulation 3.Key Recommendations
Consider Balloon Dilation Angioplasty for Postoperative Aortic Obstructions: Particularly effective in pediatric and young adult populations with lesions ≤8 mm in diameter (Evidence: Moderate) 1.
Intraoperative Techniques for Silent Obstruction Diagnosis: Utilize profound hypothermia and circulatory arrest to identify silent lower aortic obstructions during cardiac surgery (Evidence: Weak) 3.
Surgical Bypass for Severe Abdominal Aortic Obstruction: Employ prosthetic bypass from the thoracic aorta to femoral arteries for definitive revascularization in refractory cases (Evidence: Expert opinion) 2.References
1 Saul JP, Keane JF, Fellows KE, Lock JE. Balloon dilation angioplasty of postoperative aortic obstructions. The American journal of cardiology 1987. link91130-1)
2 Cevese PG, Gallucci V. Thoracic aorta-to-femoral artery by-pass. For the treatment of complete obstruction of the abdominal aorta at the level of the renal arteries. The Journal of cardiovascular surgery 1975. link
3 Salama FD, Drew CE. Silent lower aortic obstruction. Thorax 1972. link