The same rules can be applied to right-sided valvular lesions, repaired or not. A bicuspid aortic valve is a common lesion. Per se it does not affect the ability of diving. However, the risk of developing significant valvular dysfunction makes it mandatory to perform regular medical checks including an echocardiogram. There are different types of prosthetic heart valves.
Mechanical heart valves carries a risk of thrombo-embolism necessitating anticoagulant treatment.
As bruises and scratches are common when diving such a treatment may be hazardous. Patients with mechanical heart valves are recommended not to dive. Xenografts and homografts do not have this drawback but carry a risk of degeneration, which makes a regular check of valve status necessary. In repaired tetralogy of Fallot a number of conditions must be ruled out before the person can be cleared for diving. Complex congenital heart lesions.