Tricuspid regurgitation surgery

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rim Halaby, M.D. [2] Fatimo Biobaku M.B.B.S [3]

Overview

Pulmonary hypertension or myocardial disease are two factors that affect the treatment of secondary TR. The surgical approach is considered for selected patients with severe TR (stage C,D) at the time of surgery for left-sided valve lesions and to prevent later development of severe TR in patients with progressive TR (Stage B). For selected patients with isolated TR (either primary TR or secondary TR attributable to annular dilation in the absence of pulmonary hypertension or dilated cardiomyopathy), surgical intervention is recommended. Mortality rate is high in patients undergone interventions for severe isolated TR due to end-organ damage at the time of surgery. However, outcomes of patients with severe primary TR are poor with medical management. Earlier surgery for patients with severe isolated TR before the onset of severe RV dysfunction or end-organ damage is recommended.

Surgery

Indications for Surgery

Recommendations for intervention in tricuspid valve disease
Primary Tricuspid Regurgitation (Class I, Level of Evidence C):
❑Surgery is recommended in patients with severe primary tricuspid regurgitation undergoing left-sided valve surgery ❑Surgery is recommended in symptomatic patients with isolated severe primary tricuspid regurgitation without severe RV dysfunction
Primary Tricuspid Regurgitation (Class IIa, Level of Evidence C):
❑Surgery should be considered in patients with moderate primary tricuspid regurgitation undergoing left-sided valve surgery ❑Surgery should be considered in asymptomatic or mildly symptomatic patients with isolated severe primary tricuspid regurgitation and RV dilatation who are appropriate for surgery
Secondary Tricuspid Regurgitation (Class I, Level of Evidence B):
❑Surgery is recommended in patients with severe secondary tricuspid regurgitation undergoing left-sided valve surgery
Secondary Tricuspid Regurgitation (Class IIa, Level of Evidence B):
❑Surgery should be considered in patients with mild or moderate secondary tricuspid regurgitation with a dilated annulus (≥40 mm or >21 mm/m2 by 2D echocardiography) undergoing left-sided valve surgery ❑Surgery should be considered in patients with severe secondary tricuspid regurgitation (with or without previous left-sided surgery) who are symptomatic or have RV dilatation, in the absence of severe RV or LV dysfunction and severe pulmonary vascular disease/ pulmonary hypertension
Secondary Tricuspid Regurgitation (Class IIb, Level of Evidence C):
❑Transcatheter treatment of symptomatic secondary severe tricuspid regurgitation may be considered in inoperable patients

The above table adopted from 2021 ESC Guideline

Surgical Methods

Annuloplasty

The principal surgical repair for secondary TR is tricuspid annuloplasty. The aim of tricuspid annuloplasty is to improve leaflet coaptation by correcting annular dilatation and restoring annular geometry. The two principle surgical methods are:

• Ring annuloplasty: It is regarded as the standard for surgical repair. The size of the tricuspid annulus is permanently fixed by implantation of a rigid or semi rigid prosthesis, undersized ring, and it is associated with a reduced incidence of late, recurrent tricuspid regurgitation.
• Suture annuloplasty: It is technically easy and can be done quickly. Also, compared with the ring annuloplasty, a prosthetic implant is not used with suture annuloplasty and the risk of postoperative conduction disturbances is lower.

The transthoracic echocardiography after tricuspid valve repair showed satisfactory leaflet coaptation (A) and repaired papillary muscle (B). Case courtesy by Han-Young Jin et al

Other methods:

• Adjunctive repair techniques: This may be necessary for augmentation of the effects of the ring annuloplasty in patients with marked leaflet tethering and right ventricular remodeling. The long-term outcomes and durability of these adjunctive techniques are not well established. Types of adjunctive repair techniques are listed in the table below.

Anterior leaflet augmentation using an autologous pericardial patch	''Clover'' technique	Double orifice valve technique
Helps improve leaflet coaptation while maintaining leaflet mobility	Approximates the free edges of the three leaflets, producing a clover-shaped valve It has also been used to treat selected patients with complex primary tricuspid regurgitation	Promising outcomes have been reported Done by passing two sutures from the middle of the anterior portion of the annulus to the septal portion of the annulus, forcing leaflet coaptation

• Tricuspid valve replacement
  • Should be undertaken when valve repair is not technically feasible or predictably durable.
  • Valve repair should be considered as the first option in patients with secondary tricuspid regurgitation and marked right ventricular remodeling and leaflet tethering, and in patients with complex primary tricuspid regurgitation or severe tricuspid stenosis.
  • Bioprosthetic valves are currently favored, however, no differences in survival or adverse events at long-term follow-up have been recorded in patients receiving mechanical or biological valves.
• Transcatheter therapies
  • The safety and feasibility of transcatheter therapies for treating severe tricuspid regurgitation are still being investigated.
  • Three types of transcatheter therapies have recently emerged for treating severe tricuspid regurgitation:
    1. Heterotopic caval transcatheter valve implantation
    2. Transcatheter tricuspid valve annuloplasty
    3. Coaptation device

• Transcatheter tricuspid valve replacement
  • This is an experimental study that has been carried out in animals (ewes), it is yet to be done in humans.