Long-term outcomes of primary aortic valve repair in children with congenital aortic stenosis – 15-year experience at a single center

Background: Studies on the long-term outcomes of children with congenital aortic stenosis who underwent primary aortic repair are limited. We reviewed the long-term outcomes of children who underwent aortic valve (AoV) repair at our center.

Methods: All children (n = 75) who underwent AoV repair between 2006 and 2020 were reviewed. The Kaplan-Meier curve was used to demonstrate the survival estimates. The Cox proportional hazard model and competing risk regression model were used to identify risk factors for death, reintervention, adverse events, and replacement.

Results: The median age at surgery was 1.8 (IQR, 0.2–7.7) years, and the median weight at surgery was 10.0 (IQR, 5.0–24.0) kg. Early mortality and late mortality were 5.3% (4/75) and 5.6% (4/71), respectively. Risk factors for overall mortality were concomitant mitral stenosis (P = 0.01, HR: 9.8, 95% CI: 1.8–53.9), low AoV annulus Z-score (P = 0.01, HR: 0.6, 95% CI: 0.4–0.9), and prolonged cardiopulmonary bypass time (P < 0.01, HR: 9.5, 95% CI: 1.7–52.1). Freedom from reintervention was 72.9 ± 0.10% (95% CI: 56.3–94.4%) at 10 years. Risk factors for occurrence of adverse event on multivariable analysis included preoperative intubation (P = 0.016, HR: 1.004, 95% CI: 1.001–1.007) and a low AoV annulus Z-score (P = 0.019, HR: 0.714, 95% CI: 0.540–0.945). Tricuspid AoV morphology was associated with a suboptimal postoperative outcome (P = 0.03).

Conclusion: Aortic valve repair remains a safe and durable solution for children with congenital aortic stenosis. Concomitant mitral stenosis and aortic valve anatomy, including tricuspid valve morphology and smaller annulus size, are associated with poor early and long-term outcomes.

Introduction

Congenital aortic stenosis (CAS) is a lifelong disease, typically necessitating primary intervention during childhood and reintervention in later years (1). Treatments for CAS in children remain challenging, and each procedure have associated advantages and disadvantages. Considering the small aortic root and aortic valve (AoV) annulus, valve replacement is rarely performed as a preferred initial procedure. Mechanical AoV replacement requires lifelong anticoagulation and lacks growth potential. Additionally, studies have shown that the Ross procedure is not recommended as a primary intervention because of the high mortality in infants (2). It achieves higher freedom from autograft reintervention as an option for the second intervention than an option for the first intervention (3). As optimal primary treatments, surgical AoV repair and balloon aortic valvuloplasty provide similar long-term survival (4). However, several centers support that surgical AoV repair achieves better freedom from reintervention (5, 6).

Several studies have investigated the long-term outcomes in children who underwent AoV repair and have reported that the reintervention rate at 10 years was 27.9–47.9% (1, 7–10). Therefore, screening out the potential high-risk group for adverse events is essential for enhancing the follow-up of this group of patients and intervening in time. Most studies included patients who had undergone surgical aortic valvulotomy or balloon aortic valvuloplasty, which may impact prognosis after AoV repair. Furthermore, only one study used a competing risk regression model to analyze risk factors (7). We excluded patients who had undergone AoV intervention and used a competing risk regression model to determine the risk factors for reintervention and replacement. The prognostic effect of AoV number on patients with aortic stenosis remains controversial. Additionally, we explored the effect of valve leaflet morphologies on prognosis.

Materials and methods

Patients

From January 2006 to January 2021, 115 consecutive patients underwent AoV surgery at Guangdong Provincial People’s Hospital. The analysis excluded 27.8% (34/115) patients who underwent Ross operation or mechanical AoV replacement. Patients who had undergone balloon aortic valvuloplasty were excluded. Additionally, patients who had undergone surgical aortic valvotomy in other hospitals were excluded. Patients with endocarditis, rheumatic heart disease, or hypoplastic left heart syndrome were excluded from the analysis. Indications for surgery were AoV peak systolic gradient > 50 mmHg or AoV peak systolic gradient ≤ 50 mmHg with clinical symptoms. Medical records and echocardiography data were reviewed retrospectively until the most recent cardiology follow-up. The study flow chart is described in Figure 1.

FIGURE 1

Figure 1. Study flow chart. AoV, aortic valve; BaV, balloon aortic valvuloplasty; SAV, surgical aortic valvulotomy.

Definitions

Early mortality was defined as death occurring within 30 days of surgery or before discharge. All other deaths were considered late. Reinterventions were referred to as secondary AoV interventions, including balloon aortic valvuloplasty, surgical AoV repair, and AoV replacement. Any event involving death or reintervention was considered an adverse event.

Procedural success was defined by classifying outcomes into two groups (optimal and suboptimal) based on the final left ventricular outflow tract (LVOT) peak systolic gradient and aortic insufficiency (AI) grade following the procedure. These definitions are based on published articles and expert consensus (1, 11, 12). The optimal functional result consisted of a residual LVOT peak systolic gradient <35 mmHg and trivial or no AI. The suboptimal result was a residual LVOT peak systolic gradient ≥35 mmHg or mild or greater AI post-repair.

Operative technique

Aortic valve repair was performed by median sternotomy in all patients. Following complete accession of AoV, commissurotomy was performed carefully to prevent AoV regurgitation. At least one of the following techniques were adopted for better valve mobility and function: resection of nodular dysplasia, thinning of valve leaflets, extension of cusp, and suspension of commissures.

Data analysis

The endpoints were mortality, AoV reintervention, and replacement. Statistical analysis was performed using SPSS Statistics 25.0 (SPSS Inc., Chicago, IL, USA) and R software 4.2.0 (R Foundation, Beijing, China). Normally distributed continuous variables were reported as mean ±SD. Student’s t tests were used to compare differences between groups. For skewed continuous variables, the median [interquartile range (IQR)] was used to describe distributions, and the Wilcoxon-Mann-Whitney U-test was used to compare differences between groups. Descriptive statistics for categorical variables were reported as frequencies or percentages and compared using the Pearson χ² or Fisher’s exact test. Peak AoV gradient before and after AoV repair were compared using paired t test. Time-related endpoints were analyzed and plotted using Kaplan-Meier actuarial survival. The Cox proportional hazard model determined the risk factors for death and adverse events. Reintervention, replacement, and death were not independent endpoints, as postoperative death may prevent later reintervention and replacement. Hence, a competing risk regression model was used to explore the risk factors for reintervention and replacement. All tests were two-tailed, and a p-value < 0.05 was considered statistically significant.

Results

Patient characteristics

A total of 75 patients [51 (68%) men; median age at surgery, (IQR, 0.2–7.7) year] were included in the study. Concomitant cardiovascular anomalies and valve morphologies are described in Table 1. Four patients underwent cardiac surgery before AoV repair (5.3%; 4/75). Previous cardiac surgery included ventricular septal defect (VSD) closure (n = 2), patent ductus arteriosus (PDA) ligation (n = 2), atrial septal defect (ASD) closure (n = 2), mitral valve (MV) repair (n = 1), and aortic arch repair for coarctation of the aorta (CoA, n = 1).

TABLE 1

Table 1. Concomitant cardiovascular anomalies and aortic valve morphology in children who underwent AoV repair.

Nine (12.0%, 9/75) patients underwent AoV repair with a patch to extend the free edges of the cusps. Forty-seven (62.7%; 47/75) patients had bicuspid valves, and others (37.3%; 28/75) had tricuspid valves. Concomitant cardiovascular anomalies were repaired in 48 (64%, 48/75) patients. The median aortic cross-clamp time and cardiopulmonary bypass time were 40 (IQR, 25–56) minutes and 76 (IQR, 52–104) minutes, respectively. Concomitant procedures included patent foramen ovale closure (n = 14), ASD closure (n = 4), PDA ligation (n = 15), CoA repair (n = 8), interrupted aortic arch repair (n = 1), VSD repair (n = 4), MV repair (n = 9), MV replacement (n = 1), supravalvular aortic stenosis resection (n = 8), subaortic stenosis resection (n = 9), pulmonary valve repair (n = 4), and temporary cardiac pacemaker implantation (n = 3). Baseline demographics, preoperative, intraoperative, and postoperative data are described in Table 2.

TABLE 2

Table 2. Baseline characteristics.

Aortic valve function

Immediate postoperative echocardiographic data were unavailable for two (2.7%, 2/75) patients. The mean LVOT peak gradient for the whole cohort decreased from 72.1 ± 20.3 mmHg to 30.5 ± 13.2 mmHg (P < 0.01). AI progressed in 13 (17.3%, 13/75) patients, of whom nine (12.0%, 9/75) patients had mild regurgitation without need for intervention, two (2.7%, 2/75) patients had moderate regurgitation, and two (2.7%, 2/75) patients had severe regurgitation. The outcome was optimal in 32 (43.8%) patients and suboptimal in 41 (56.2%) patients.

Mortality

The median follow-up period was 4.1 years. Follow-up was completed in 95.7% of the survivors. The causes of death are summarized in Supplementary Table 1. Early mortality and late mortality were 5.3% (4/75) and 5.6% (4/71), respectively. Overall survival was 91.5 ± 0.03% (95% CI: 85.3–98.3%) at 5 years and 82.7 ± 0.07% (95% CI: 70.4–97.3%) at 10 years (Figure 2A). In older children, survival was 100% at 5 years and 87.5 ± 0.09% (95% CI: 72.1–99.9%) at 10 years. Survival was lower in infants than in older children (P = 0.021, Figure 3). Risk factors for overall mortality on multivariable analysis included concomitant mitral stenosis (p = 0.01, HR: 9.8, 95% CI: 1.8–53.9), low AoV annulus Z-score (P = 0.01, HR: 0.6, 95% CI: 0.4–0.9), and prolonged cardiopulmonary bypass (CPB) time (P < 0.01, HR: 9.5, 95% CI: 1.7–52.1) (Table 3). The receiver operating characteristic curve and Youden J index analysis identified a cutoff value for AoV annulus diameter Z-score of 0.745 (sensitivity, 61.2%; specificity, 75%; area under the curve, 0.69). This cutoff value appropriately categorized survival when applied to our study cohort (Figure 4A).

FIGURE 2

Figure 2. Survival (A) freedom from reoperation (B) Adverse event (C) Replacement (D) for the overall cohort.

FIGURE 3

Figure 3. Survival comparing of infants and children older than 1 year of age.

TABLE 3

Table 3. Univariate and multivariate analyses for overall death.

FIGURE 4

Figure 4. Survival after AoV repair (A) and freedom from adverse event (B) in patients with different aortic annulus diameter Z-score.

Reintervention

Eight (11.3%, 8/71) patients required reintervention. The reasons for reintervention and reintervention type are described in Supplementary Table 2. AoV reintervention occurred at a median of 3.9 (range, 0.4–9.7) years after primary repair. Four patients underwent AoV replacement. AoV replacement was performed at a median of 8.6 (range, 4.2–9.9) years after primary repair.

Overall freedom from any reintervention was 93.2 ± 0.03% (95% CI: 87.0–99.9%) at 5 years and 72.9 ± 0.10% (95% CI: 56.3–94.4%) at 10 years (Figure 2B). The competing risk model showed that preoperative moderate or greater AI (P = 0.048, HR: 6.3, 95% CI: 1.0–39.5) was the risk factor associated with reintervention (Table 4). Freedom from AoV replacement was 97.4 ± 0.03% (95% CI: 92.4–99.9%) at 5 years and 79.7 ± 0.10% (95% CI: 62.8–99.9%) at 10 years (Figure 2C). Competing risk models showed that postoperative moderate or greater AI (P = 0.030, HR: 10.4, 95% CI: 1.3–85.8) and weight at surgery (P < 0.001, HR: 6.3, 95% CI: 1.0–1.1) (Table 4) were risk factors associated with reintervention.

TABLE 4

Table 4. Risk factors for reintervention and replacement by competing risk regression model.

Adverse event

Overall freedom from any adverse event was 86.8 ± 0.04% (95% CI: 79.0–95.3%) at 5 years and 65.4 ± 0.09% (95% CI: 49.6–86.1%) at 10 years (Figure 2D). In older children, freedom from adverse events was higher than in infants (P = 0.07). Risk factors for occurrence of adverse events on multivariable analysis included preoperative intubation (P = 0.016, HR: 1.004, 95% CI: 1.001–1.007) and a low AoV annulus Z-score (P = 0.019, HR: 0.714, 95% CI: 0.540–0.945) (Table 5). The cutoff value for the AoV annulus diameter Z-score was –1.26 (sensitivity, 91.8%; specificity, 35.7%; area under the curve, 0.66) (Figure 4B).

TABLE 5

Table 5. Univariate and multivariate analyses for adverse event.

Outcomes according to aortic valve morphology

Patients with tricuspid AoV morphology were at higher risk of suboptimal outcomes (P = 0.03). Although the incidence of concomitant repair and suboptimal outcome was higher in patients with tricuspid AoV morphology, no significant differences in postoperative intubation time (P = 0.35) and ICU duration (P = 0.81) existed between the two groups. No differences in survival (P = 0.36), freedom from reintervention (P = 0.61), and adverse event (P = 0.14) existed between patients with tricuspid and bicuspid AoV morphologies.

Discussion

Our study elicited three main findings. First, AoV repair was a successful primary intervention and postponed the time of reoperation or AoV replacement to a suitable age. Second, concomitant MS, low AoV annulus Z-score, and prolonged cardiopulmonary bypass time were risk factors for death. Preoperative intubation and a low AoV annulus Z-score were risk factors for adverse events. Third, tricuspid AoV morphology was associated with higher incidence of suboptimal outcomes than bicuspid AoV morphology.

In the past decades, balloon aortic valvuloplasty (BAV) was popular in several centers. However, balancing the residual peak aortic gradient and postoperative AI is challenging, because it may break the weakest, thinnest part of the leaflet and cannot relieve the stenosis directly and precisely as AoV repair would (5, 6). With development of new surgical techniques, including leaflet thinning, commissural suspension, and cusp extension, AoV repair currently achieves a better long-term outcome in children with CAS (1, 13, 14), including neonates and infants (6, 15). Therefore, our center has preferred AoV as the initial AoV repair in recent years.

Mortality

In our study, early mortality and late mortality were 5.3% (4/75) and 5.6% (4/71), respectively. Similarly, Schlein et al. (7) reported that early mortality and late mortality were 5.6 and 6.7%, respectively. Furthermore, in patients with isolated AS, survival was much higher. Wallace et al. (1) reported early mortality of 0.9% and late mortality of 0.9% in their cohort of isolated patients with AS who underwent AoV repair.

Additionally, we found that the presence of mitral stenosis is an independent risk factor for death. Similarly, the presence of multiple left-heart obstructions was associated with mortality in this study. Brown et al. (16) found that most patients with multiple left-heart obstructions had pulmonary hypertension, which is associated with mortality. Concurrently, multiple left-heart obstructions lead to impairment of global cardiac function, which may increase the risk of death. The subset of patients is diagnosed with incomplete shone syndrome (17), and their operative mortality is adversely affected by the severity of mitral valve disease (18).

Reintervention and adverse event

Freedom from reintervention, ranging from 35 to 78% after 10 years of follow-up, remains a vexing surgical problem (8, 19–21). In the overall cohort, freedom from reintervention and replacement at 10 years was 72.9 and 79.9%, respectively. The mean age at reintervention was 9.3 years, when the Ross procedure could achieve excellent outcomes. Ross procedure achieves higher freedom from autograft reintervention as an option for the second intervention than an option for the first intervention (3). Therefore, AoV repair achieves durable and acceptable freedom reintervention as a primary intervention.

In accordance with the previous report (7, 8, 22), we showed that a small aortic annulus was associated with mortality and adverse event. Although aortic annulus size is not a risk factor for reintervention in the competing risk model, we considered it to imply a poor outcome. A diminished aortic annulus offers less room or possibility for repair and increases the difficulty of surgery. Concurrently, a small annulus predicts a higher pressure gradient after surgery because it cannot be relieved by repair surgery, which can explain the increased risk of mortality and reintervention. Similarly, Reich et al. (23) demonstrated that hypoplastic annulus increases the risk of both BAV and AoV repair. Additionally, Schlein et al. argued that aortic annulus size and mitral valve condition determine the prognosis for patients who underwent AoV repair (7, 8). Our study demonstrated that primary AoV repair achieves superior survival in patients with an AoV annulus diameter Z-score ≥0.745 and freedom from adverse event in patients with an AoV annulus diameter Z-score≥–1.26. A further study is required to determine the optimal approach for patients with smaller AoV annulus.

Furthermore, this study confirmed that preoperative moderate or greater AI was an independent risk factor for reintervention and postoperative AI for replacement in the competing risk regression model. Auld et al. (24) found that postoperative AI could predict worse freedom from intervention. Other previous studies demonstrated that patients with postoperative AI were likely to require early AoV replacement (24, 25), which can be explained by the fact that volume overload is more difficult for adjustment by the left ventricular myocardium than pressure overload (5). Furthermore, repair for individuals with combined AS and AI is more challenging. Therefore, AoV replacement is the preferred resolution.

Aortic valve morphology

The effect of AoV morphology on long-term outcome remains controversial. In our study, we found no difference in long-term outcomes between children with tricuspid valves and those with bicuspid valves. Vergnat et al. (15) suggested that neonates with tricuspid arrangement after open valvoplasty achieve higher freedom from replacement. Conversely, Wallace et al. (1) showed that tricuspid AoV was associated with worse freedom from reintervention and postoperative suboptimal outcome, which implied lower freedom from reoperation. Although we found no association between reoperation and AoV morphology due to limited sample size and follow-up time, tricuspid AoV morphology was associated with a suboptimal outcome. This finding may be due to the complex techniques used to achieve tricuspidization (26). Further studies and longer follow-up times are required to determine whether AoV morphology affects reoperation or AoV replacement.

Limitations

This study had several limitations. First, this retrospective study included a limited number of patients who underwent AoV repair in a single center for 15 years. Second, we could not preclude results from being influenced by differences between surgeons and perform subgroup analysis by surgeons because of the limited number of patients.

Conclusion

Our results support that AoV repair for patients with CAS can be a successful primary strategy. The independent predictors of death were concomitant mitral stenosis, smaller AoV annulus, and prolonged CPB time. Patients with low AoV annulus Z-score and preoperative intubation were at higher risk of adverse event. The incidence of the suboptimal operative outcome in patients with tricuspid valve morphology was higher than in patients with bicuspid valve morphology.

Data availability statement

The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.

Ethics statement

The study was approved by the Guangdong Provincial People’s Hospital Institutional Research Ethics Board (2019338H).

Author contributions

QR, JY, and TC wrote the manuscript and conducted the statistical analysis. HQ, EJ, and TL inspected and validated the data. JZ and XL provided the funding support and supervision. SW, JC, and XX revised the manuscript. All authors contributed to the article and approved the submitted version.

Funding

This work was funded by Science and Technology Planning Project of Guangdong Province (No. 2019B020230003), Science and Technology Projects in Guangzhou, China (202206010049), Guangdong Provincial Clinical Research Center for Cardiovascular disease (2020B1111170011), and Guangdong Special Funds for Science and Technology Innovation Strategy, China (Stability Support for Scientific Research Institutions Affiliated to Guangdong Province-GDCI 2021).

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher’s note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fcvm.2022.1029245/full#supplementary-material

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