Abstract
The meta-analysis by He and collaborators [has the worth to cover, as
much as possible, a gap of scientific evidence where conducting a
randomized trial appears very complex for ethical and logistical
reasons. The authors concluded that mitral valve repair (MVP) provide
better pooled results, both early and late, with respect to mitral valve
replacement (MVR). However, the superiority of MVP is driven by some
single large cohort-studies where surgeons had wide experience in the
field of MVP for IE. This finding is also confirmed by other studies.
But if mitral repair produces such a better short- and long-term
survival than replacement, why are there no clear indications from
consensus and guidelines pushing surgeons toward the pursuit of a
reconstructive procedure at almost any cost? We wonder but to repair or
not to repair, is that really the question? The AATS consensus suggests
to repair “whenever possible” but without providing more specific
indications.
If the two primary goals of surgery are total removal of infected
tissues and reconstruction of cardiac morphology, including repair or
replacement of the affected valve(s), probably MVP as to perform in case
of less extensive tissue detriment by the infection. In more wide valve
involvement, MVP may be the choice but only in very expert hands and in
Centers with very large volume of valve repairing. This decision cannot
therefore be the result of the choice of an individual but must derive
from a careful multidisciplinary discussion to be held in an EndoTeam.
Keywords: mitral valve repair; mitral valve replacement; infective
endocarditis
The meta-analysis by He and collaborators [1] has the worth to
cover, as much as possible, a gap of scientific evidence where
conducting a randomized trial appears very complex for ethical and
logistical reasons. The conclusions come from the pooling analysis of 17
retrospective observational studies and looking at table 2 it is
possible to deduce how the two cohorts in comparison are different;
patients undergoing mitral valve replacement (MVR) showed higher
prevalence of heart failure, which is considered a risk factor for worse
outcome [2].
Concerning early mortality, although the pooled analysis is in favor of
mitral valve repair (MVP), it can be observed that there are only two
studies [3,4] leading to this cumulative result, and in particular
the one by Toyoda et al [3] which is the only one including a very
large cohort.
An interesting finding is the one plotted in the figure 3, where
short-term mortality is similar in the two groups until 2010 and instead
in the last decade appears significantly better in the MVP group, very
likely due to the improvement of reconstructive techniques and the
increase of centers with greater experience in the field [3]; in IE
of native mitral valve, a successful valve repair can be achieved in
60-to-80% of patients, but the key to reach such a rate is the
experience of the surgical team [5-7]
In several risk scores, the choice of procedure is not included among
the risk factors [8-10]. In either Italian [8] and North
American scores [10], the multivalve involvement was found to be
prognostically unfavorable rather than a specific procedure used (repair
versus replacement).
A similar meta-analysis was published in 2018 by Harky et al [11].
Where the pooled outcome of 8978 patients (14 articles) was evaluated;
The authors Postoperative outcomes (30 days/in hospital events) such as
bleeding (P = 0.0047) and recurrence of infective endocarditis
(IE) (P = 0.004) were significantly lower in the MVP group; the authors
attributed the lower complication rate to a reduction in CPB time with
repair versus replacement, but this can be true only in case of simple
repair procedure.
In fact, the two primary goals of surgery are total removal of infected
tissues and reconstruction of cardiac morphology, including repair or
replacement of the affected valve(s) [12]. Hence, repair is favored
when IE affects the mitral valve without an extensive destruction
leaflets or in absence of an abscess; after an extensive debridement of
the infected tissue, it is of paramount importance to assess of the
valve in order to evaluate whether the remaining tissue is of sufficient
quality to achieve a durable repair [13]
In the present meta-analysis [1],the study by Toyoda et al drives
also long-term survival in favor of MVP, while no difference was found
concerning long-term recurrence and reoperation.
Recurrences are rare following IE and may be associated with inadequate
initial antibiotic therapy, resistant microorganisms, persistent focus
of infection, i.v. drug abuse and chronic dialysis. Patients with IE
must be informed of the risk of recurrence and educated about how to
diagnose and prevent a new episode of IE. [12]
In Nationwide cohort study of mitral valve repair versus replacement for
infective endocarditis [14], long-term results of two
propensity-matched groups were reported; At a roughly 5-year follow,
long-term mortality was 19.3% and 31% in the MVP and MVR,
respectively, with the former having an approximately 50% reduced risk
of death compared to the latter (hazard ratio [HR], 0.62; 95%
confidence interval [CI], 0.46–0.850.8; P . .003). The Authors
failed to evidence any significant difference in terms of reoperation
between the two procedures.
However, the most important finding of this propensity-matched study is
that patients receiving surgery in hospitals with the highest valve
surgery volumes (HR 0.60, 0.40-0.90) benefited from MVP significantly,
whereas those who received surgery in the lowest volume hospitals did
not (HR 0.63, 0.31-1.27).
But if mitral repair produces such a better short- and long-term
survival than replacement, why are there no clear indications from
consensus and guidelines pushing surgeons toward the pursuit of a
reconstructive procedure at almost any cost?
We wonder but to repair or not to repair, is that really the question?
In our opinion, the application of common sense in dealing with a valve
disease presenting with so heterogeneous pathological pictures as to
make difficult to standardize a procedural algorithm, is the best answer
we can give to the latter question.
In this sense, we found that the AATS consensus [15] clearly stated
that although MVP is the preferred choice, it has performed “whenever
possible”.
But what does actually mean “whenever possible”?
Browsing the literature, we probably found a possible answer to this
doubt; Very recently, Rostagno [16] summarized the features that may
lead surgeon towards either repair or replacement: single scallop or
leaflet valve involvement, isolated vegetation, valve perforation, less
extensive valve damage with enough tissue after debridement favor MVP,
in all other cases we do not have to fear to implant a prosthesis
When valve replacement is required, there is little evidence that risk
of recurrent infection is different between mechanical and tissue
prostheses. The use of bioprosthetic valves may avoid postoperative
anticoagulation, lowering the risk of hemorrhagic conversion of strokes
and other bleeding complications.
So, in conclusion, the choice of technique in vase of MVIE depends on
depends on unavoidable factors: extension of the infection, expertise of
the surgeon, volume load of the Cardiac Center, age of the patient and
his/her willingness to take medications, especially oral
anticoagulation.
This decision cannot therefore be the result of the choice of an
individual but must derive from a careful multidisciplinary discussion
to be held in an EndoTeam.
References
- He K, Song J, Luo H, Su H, Liang W, Bian L et al. Valve replacement or
repair in native mitral valve infective endocarditis—which is
better? A meta-analysis and systematic review. J Card Surg 2022 in
press
- San Roman JA, Lopez J, Vilacosta I, Luaces M, Sarria C, Revilla A, et
al. Prognostic stratification of patients with left-sided endocarditis
determined at admission. Am J Med 2007;120: 369–367.
- Toyoda N, Itagaki S, Egorova NN, Tannous H, Anyanwu AC, El-Eshmawi A
et al. Real-world outcomes of surgery for native mitral valve
endocarditis. J Thorac Cardiovasc Surg 2017;154:1906-1912.e9.
- Solari S, De Kerchove L, Tamer S, Aphram G, Baert J, Borsellino S, et
al. Active infective mitral valve endocarditis: is a repair-oriented
surgery safe and durable? Eur J Cardiothorac Surg 2019;55:256-262.
- Dreyfus G, Serraf A, Jebara VA, Deloche A, Chauvaud S, Couetil JP at
al. Valve repair in acute endocarditis. Ann Thorac Surg
1990;49:706–711,
- de Kerchove L, Vanoverschelde JL, Poncelet A, Glineur D, Rubay J, Zech
F et al. Reconstructive surgery in active mitral valve endocarditis:
feasibility, safety and durability. Eur J Cardiothorac Surg
2007;31:592–599.
- Shang E, Forrest GN, Chizmar T, Chim J, Brown JM, Zhan M, et al.
Mitral valve infective endocarditis: benefit of early operation and
aggressive use of repair. Ann Thorac Surg 2009;87:1728–1733
- Di Mauro M, Dato GMA, Barili F, Gelsomino S, Santè P, Della Corte A et
al. A predictive model for early mortality after surgical treatment of
heart valve or prosthesis infective endocarditis. The EndoSCORE. Int J
Cardiol. 2017 Aug 15;241:97-102.
- De Feo M, Cotrufo M, Carozza A, De Santo LS, Amendolara F, Giordano S
et al. The need for a specific risk prediction system in native valve
infective endocarditis surgery. Scientific World Journal
2012;2012:307571.
- Gaca JG, Sheng S, Daneshmand MA, O’Brien S, Rankin JS, Brennan JM, et
al. Outcomes for endocarditis surgery in North America: a simplified
risk scoring system. J Thorac Cardiovasc Surg 2011;141: 98–106
- Harky A, Hof A, Garner M, Froghi S, Bashir M. Mitral valve repair or
replacement in native valve endocarditis? Systematic review and
meta-analysis. J Card Surg. 2018 Jul;33(7):364-371
- Habib G, Lancellotti P, Antunes MJ, Bongiorni MG, Casalta JP, Del
Zotti F et al. 2015 ESC Guidelines for the management of infective
endocarditis: The Task Force for the Management of Infective
Endocarditis of the European Society of Cardiology (ESC)
Endorsed by: European Association for Cardio-Thoracic Surgery (EACTS),
the European Association of Nuclear Medicine (EANM). Eur Heart J
2015;36:3075-128.
- Meszaros K, Nujic S, Sodeck GH, Englberger L, Konig T, Schonhoff F, et
al. Long-term results after operations for active infective
endocarditis in native and prosthetic valves. Ann Thorac Surg
2012;94:1204–1210
- Lee HA, Cheng YT, Wu VC, Chou AH, Chu PH, Tsai FC et al. Nationwide
cohort study of mitral valve repair versus replacement for infective
endocarditis. J Thorac Cardiovasc Surg. 2018;156:1473-1483
- AATS Surgical Treatment of Infective Endocarditis Consensus Guidelines
Writing Committee Chairs, Pettersson GB, Coselli JS; Writing
Committee, Pettersson GB, Coselli JS, Hussain ST, Griffin B,
Blackstone EH, Gordon SM, LeMaire SA, Woc-Colburn LE. 2016 The
American Association for Thoracic Surgery (AATS) consensus guidelines:
Surgical treatment of infective endocarditis: Executive summary. J
Thorac Cardiovasc Surg. 2017;153:1241-58
- Rostagno C. Mitral valve repair in infective endocarditis: which
evidence? Vessel Plus 2020;4:7-12