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Calcification and degeneration following mitral valve reconstruction in patients requiring chronic dialysis
T J Lewandowski1, W F Armstrong, S F Bolling
1Department of Internal Medicine, University of Michigan, Ann Arbor, USA.
Insights
Mitral valve repair in dialysis patients showed early success but led to accelerated calcification and increased gradients. This resulted in a high failure rate, suggesting further research is needed for optimal interventions.
Area of Science:
- Cardiology
- Nephrology
- Surgical Innovation
Background:
- Abnormal calcium homeostasis in end-stage renal failure (ESRD) causes dystrophic calcification, limiting prosthetic valve use in dialysis patients.
- Mitral valve reconstruction offers potential advantages over replacement, particularly for ESRD patients on dialysis.
Purpose of the Study:
- To evaluate the outcomes of mitral valve reconstruction in patients with end-stage renal failure requiring chronic dialysis.
Main Methods:
- Retrospective analysis of 10 ESRD patients on chronic dialysis who underwent mitral valve repair.
- Clinical and echocardiographic follow-up was performed, assessing valve function and calcification.
Main Results:
- Seven of eight patients showed mitral leaflet calcification post-surgery, with significantly increased transmitral gradients (4.8 to 8.3 mmHg).
- Two patients required reoperation due to valve failure (chordal rupture and calcification with stenosis).
Conclusions:
- Mitral valve reconstruction in dialysis patients results in accelerated calcification and high failure rates despite good initial surgical outcomes.
- Prospective studies are needed to determine the optimal mitral valve intervention for ESRD patients on dialysis.
Background And Aim Of The Study:
Abnormal calcium homeostasis in patients with end-stage renal failure results in dystrophic calcification; this limits the use of heterograft tissue valve prostheses in patients on chronic dialysis. Mitral valve reconstruction offers advantages over mitral replacement in many patients without renal failure, and offers theoretical advantages in patients requiring dialysis. This study was performed to determine the outcome of mitral valve reconstruction in patients with renal failure requiring chronic dialysis.
Methods:
Ten patients with end-stage renal failure and on chronic dialysis who underwent mitral valve repair were identified retrospectively and followed for clinical and echocardiographic outcome. All patients had good results immediately following surgical valve mitral repair, with no more than mild mitral regurgitation and low transmitral gradients on intraoperative transesophageal echocardiography.
Results:
Clinical and echocardiographic follow up was available for eight patients at an average of 2.3 +/- 1.4 years after surgery. Despite there being no significant valve calcification at the time of surgery, visible mitral leaflet calcification was evident in seven of these patients, and the transmitral gradient for the group was significantly increased (from 4.8 +/- 1.7 mmHg to 8.3 +/- 3.9 mmHg, p = 0.04). Two patients required reoperation for failed mitral repair; one at six months due to chordal rupture, and one at 15 months due to mitral calcification with stenosis.
Conclusion:
Despite good early surgical results, there was accelerated calcification of the repaired mitral valve, a rapid increase in postoperative mitral gradients, and a high incidence of failure of the reconstruction. Additional prospective studies are required to evaluate the optimal intervention for patients with end-stage renal failure who require mitral valve surgery.