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Chronic intravascular hemolysis after valvular surgery
1Department of Surgery, National Taiwan University Hospital, Taipei, R.O.C.
Insights
Mechanical heart valves show higher rates of intravascular hemolysis than xenograft tissue valves following cardiac surgery. This study highlights potential risks and comparative performance of different prosthetic valve types.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Biomaterials Science
Background:
- Intravascular hemolysis is a known complication after cardiac valvular surgery.
- Prosthetic heart valves are commonly used, with mechanical and bioprosthetic (xenograft) types being prevalent.
- Understanding the incidence and risk factors for hemolysis is crucial for patient management.
Purpose of the Study:
- To investigate the phenomenon of intravascular hemolysis in patients following cardiac valvular surgery.
- To compare the incidence of hemolysis between different types of prosthetic valves (mechanical vs. xenograft) and valve repair.
- To assess the occurrence of secondary complications such as anemia and gallstones.
Main Methods:
- A study was conducted on 156 patients who underwent cardiac valvular surgery.
- Patients were categorized based on the type of valve implanted: mechanical, xenograft tissue valve, or mitral valve repair.
- Data on hemolysis, anemia, and gallstone incidence were collected and analyzed.
Main Results:
- Subclinical hemolysis was observed in 68.9% of patients with prosthetic valve implants.
- Patients with mechanical prosthetic valves had a significantly higher incidence of hemolysis (81.6%) compared to those with bioprosthetic tissue valves (23.1%).
- Anemia secondary to hemolysis occurred more frequently in patients with mechanical valves (8.8%) than xenograft valves (3.8%). Symptomatic gallstones were noted in 9.3% of patients with valve prostheses.
Conclusions:
- Mechanical prosthetic valves are associated with a higher incidence of intravascular hemolysis compared to xenograft tissue valves.
- While mechanical valves offer certain advantages, xenograft tissue valves demonstrate a superior profile regarding hemolysis.
- The findings suggest careful consideration of valve type selection to minimize hemolysis-related complications.
Abstract:
The Phenomenon of intravascular hemolysis following cardiac valvular surgery was studied among 156 randomly selected patients. There were 76 men and 80 women, varying in ages between 15 and 71 years, with a mean age of 48.3 years. The time interval between the study and the operations ranged from 2 to 163 months with a mean of 41.1 months. The prosthetic valve was used in 129 patients; the xenograft tissue valve in 26 and the mechanical valve in 103. Subclinical hemolysis occurred in 68.9% of the 129 patients who had one or more prosthetic valve implants and in 14.8% of the 27 patients who underwent plastic repair of the mitral valve. Compared among the groups with different valve prosthesis, hemolysis could be detected in 81.6% of the patients with a mechanical prosthetic valve and in 23.1% of those with a bioprosthetic tissue valve (p less than 0.05). Twelve patients who had a valve prosthesis were documented to have symptomatic gallstones with an incidence of 9.3%. Among them, only 2 patients had biliary colic and required cholecystectomy to relieve the associated symptom. Anemia, secondary to the hemolysis, occurred in 3.8% of those with a xenograft tissue valve and 8.8% of those with a mechanical valve (p less than 0.05). None of them needed a blood transfusion. None had related renal impairment. In conclusion, the mechanical valve prosthesis has a higher incidence of hemolysis than the xenograft valve. Though the mechanical valve prosthesis has its own merits, the xenograft tissue prosthesis is superior in this respect.