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J Am Coll Cardiol, 2004; 44:1641-1647, doi:10.1016/j.jacc.2004.07.037 © 2004 by the American College of Cardiology Foundation |


* Adult Congenital Heart Disease Unit, Radiology Department, La Paz University Hospital, Madrid, Spain
Radiology Department, La Paz University Hospital, Madrid, Spain
Virgen Macarena University Hospital, Sevilla, Spain
Manuscript received February 8, 2004; revised manuscript received May 6, 2004, accepted July 5, 2004.
* Reprint requests and correspondence: Dr. Jose Maria Oliver, Unidad Médico-Quirúrgica de Cardiología, Hospital Universitario La Paz, Castellana 261, Madrid 28046 (Email: pepeoliver{at}jet.es).
| Abstract |
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BACKGROUND: Aortic wall complications may develop in adults with coarctation of the aorta, despite successful surgical repair in childhood.
METHODS: A total of 235 adults with coarctation (mean age 27 ± 13 years) were retrospectively reviewed. Treatment had been performed by surgery in 181 patients (group I) or by balloon angioplasty or stenting in 28 patients (group II). No previous intervention had been carried out in 26 patients with mild coarctation at diagnosis (group III).
RESULTS: Forty-four aortic wall complications were found in 37 patients (16%). There were no differences among the three groups with respect to total complications (15%, 18%, and 15%, respectively), ascending aortic aneurysms (9%, 11%, and 12%), or descending aortic aneurysms (4% in all three groups). Multivariate analysis did not show a significant relationship between previous repair, type of repair, age at repair, residual Doppler pressure gradient, or systemic hypertension and the occurrence of aortic complications. Only aging (risk ratio [RR] 1.4 per decade of age, 95% confidence interval [CI] 1.1 to 1.8, p = 0.002) and bicuspid aortic valve (RR 3.2, 95% CI 1.3 to 7.5, p = 0.005) were significantly related to these complications.
CONCLUSIONS: Aortic wall complications are frequent in adults with coarctation of the aorta beyond that attributable to associated hemodynamic derangement or previous repair. The only independent risk factors appear to be advanced age and bicuspid aortic valve.
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40 mm, respectively, in which elective repair was indicated; 2) intimal flap of aortic dissection at the ascending or descending aorta; 3) aortic false aneurysm at the site of coarctation or repair; 4) mycotic aneurysm at coarctation or previous repair site; 5) aortic fistulae into the bronchial tree or cardiac chamber; and 6) acute rupture of the aorta resulting in hypovolemic shock or sudden death (Table 2).
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Statistical analysis. Data are expressed as the mean value ± SD for continuous variables. The Mann-Whitney U test was used for comparison of non-normally distributed (as the Kolmogorov-Smirnov test) continuous variables. The Fisher exact test was used to compare noncontinuous variables expressed as proportions. Variables were entered into univariate and multivariate analyses, performed with a stepwise forward logistic regression model. The risk ratio (RR) and 95% confidence intervals (CIs) were calculated with Cox proportional hazards regression models, and p < 0.05 (two-sided) was taken to be significant.
| Results |
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Risk factors for aortic complications. Clinical and echocardiographic variables were entered into univariate and multivariate analyses to assess predisposing conditions for aortic complications. A significant relationship between a previous intervention, residual trans-coarctation Doppler pressure gradient, or systemic hypertension was not found (Table 3). Aortic complications were univariately associated with age at intervention (16 ± 15 years vs. 10 ± 14 years, p = 0.027), current age (33 ± 16 years vs. 26 ± 12 years, p = 0.006), and the presence of a BAV (78% in patients with an aortic wall complication vs. 53% in patients without a complication, p = 0.005), but they were independently predicted only by the age at the moment of the study (RR 1.4 per decade of age, 95% CI 1.1 to 1.8, p = 0.002) and the association with a BAV (RR 3.2, 95% CI 1.7 to 7.5, p = 0.005). The prevalence of aortic complications increased from 2.8% in patients younger than 20 years of age without a BAV to 50% in patients older than 39 years of age with BAV (Fig. 3).
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| Discussion |
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Prevalence. Previous studies have targeted aneurysm formation late after patch aortoplasty, a surgical technique associated with a reported prevalence up to 5% to 50% of aneurysm formation at the site of repair (1618). Few studies have systematically examined aneurysm development after surgical repair of coarctation of the aorta. Therrien et al. (24) reported a prevalence of 14% in aneurysm formation in 84 adult patients after surgical repair or balloon angioplasty. Aneurysm was defined as a discrete bulging of the aorta at the repair site >150% of the diameter of the descending aorta at the level of the diaphragm. However, aortic aneurysms localized at a distance from the aortic isthmus or other aortic wall complications were not included. A recent report by von Kodolitsch et al. (14) noted that a significant proportion of aneurysms after coarctation repair had developed in the ascending aorta, with extensive aortic widening. In the present study, significant aortic complications resulting in death or the need for surgery are analyzed, including aneurysm formation at the ascending or descending aorta, true or false aneurysms, aortic dissection, rupture, mycotic aneurysm, or fistulization. Neither previous repair nor untreated coarctation nor type of surgical or percutaneous intervention was distinguished when the prevalence of aortic complications was analyzed. A total of 44 aortic complications were found in 37 of 235 patients, bringing the prevalence of aortic complications among adults with coarctation of the aorta to 16%. Ascending aortic aneurysms were the most frequently encountered complications with an increase of two-fold in prevalence with respect to that of a descending aortic aneurysm. However, the number of aortic complications in either the ascending or descending aorta could be underestimated because noninvasive screening methods for early detection of complications were not performed.
Previous repair. Comparisons of aortic complications between repaired or unrepaired adults with coarctation of the aorta or between surgical or transcatheter repair of the coarctation have not been previously reported. In this study, surgical repair of the coarctation of the aorta had been performed in 77% of patients, balloon angioplasty or stenting in 12%, and the remaining 11% with mild coarctation at diagnosis had not undergone a previous intervention. Remarkably, the prevalence of aortic complications was quite similar in the three groups, and we have not found statistically significant differences in the prevalence of aortic complications between patients corrected by patch graft aortoplasty or other surgical procedures. Several studies have shown that advanced age at coarctation repair may be a significant predictor of late survival and aneurysm formation (1,2,14), but the effect of age at repair might be influenced by the older age at follow-up of patients with late repair. In previously repaired patients of our series, age at repair was significantly older in patients with than in those without aortic complications. However, this difference did not achieve statistical significance in multivariate analysis, probably because the age at repair was directly related to current age, and an advanced age at the moment of the study was the most important risk factor for aortic complications in this study group.
Predisposing conditions. Aortic complications may be related to the technique of coarctation repair, hemodynamic derangement imposed by residual coarctation or re-coarctation, intrinsic abnormalities of the aortic wall, or any combination of these three factors. Previous studies have mainly focused on the effect of the repair procedure and emphasizedthe high prevalence of aneurysm formation at the site of repair in patients with patch graft aortoplasty (1618). However, aneurysm formation in relation to other techniques of surgical repair, complications localized at a distance from the repair site or even in unrepaired patients, and aortic complications other than aneurysms have not been well characterized to date. In line with previous reports (14), we found that there was no association between the remaining hemodynamic derangement and the development of aortic complications. Although we do not have complete data on catheterization pressure gradients or arm-leg pressure gradients, neither trans-coarctation peak pressure gradient nor persistent systemic hypertension were significantly related to aortic complication in our series. The only conditions that independently predicted an aortic complication were advanced age and the coexistence of a bicuspid aortic valve. The prevalence of aortic complications was lower than 3% in patients younger than 20 years old without a BAV, but it increased up to 50% in patients older than 39 years old with a BAV (Fig. 3).
BAV. Previous studies have shown that aortic dimensions are larger in patients with a BAV than in control subjects with comparable degrees of TAV disease (25). Aortic enlargement in people with a BAV occurs independent of hemodynamic abnormalities (26). Patients with a BAV have thinner elastic lamellae of the aortic media and greater distances between the elastic lamellae than do patients with a TAV (27). Premature medial layer smooth muscle cell apoptosis could be part of a genetic program underlying aortic disease in these patients (28,29). Intrinsic weakness of the aortic wall beyond that predicted by hemodynamic factors might also be responsible for aortic complications in adults with coarctation of the aorta. Coarctation of the aorta is associated with a BAV in more than 50% of patients, and this association has been demonstrated to be a risk factor for ascending aorta aneurysms after coarctation repair (14). However, we did find that the bicuspid valve is also associated with other types of aortic complications in adults with either repaired or non-repaired coarctation of the aorta. The prevalence of a BAV was 86% in an ascending aortic aneurysm, 73% in descending aortic complications, and 80% in an aortic aneurysm at the site of previous surgical repair, compared with 53% in patients without aortic wall complications. Although the study is not powered enough to statistically analyze the small group of patients with complications at the site of previous repair and descending aortic aneurysms, our data show that the BAV might also be a predisposing factor for non-ascending aortic wall complications. Furthermore, marked media degeneration of the aortic wall has been reported in more than 50% of aneurysm wallat the site of surgical repair using patch graft angioplasty (30), suggesting that intrinsic abnormalities of the aortic wall may be responsible, at least in part, for local aneurysm formation after surgery. Recently, it has been noted that the association of coarctation of the aorta and BAV might represent part of the spectrum of a diffuse arteriopathy (31). Unfortunately, a systematic pathologic examination was not available in many of the cases that were sent for surgery in our retrospective series to address these issues, but our findings are also consistent with the hypothesis that intrinsic abnormalities of the aortic wall could be responsible for many aortic complications in patients with coarctation of the aorta.
Management considerations. Evaluation of aortic dilation must be treated as a continuum. We have focused on aortic complications that resulted in death or the need for surgery, but many patients have ascending aortic dilation <55 mm or descending aortic bulging <40 mm, and they might be at risk for further dilation or even dissection and rupture. Adults with coarctation of the aorta, either repaired or not, especially when associated with a bicuspid aortic valve, should be closely followed up for detecting progressive aortic dilation. Whether or not beta-blockers might help to prevent aortic dilation, as demonstrated in Marfan's syndrome (32), is still undetermined. Because most of the patients with aortic dilation in our series,including those with severe aortic complications, were receiving preoperative beta-blockade therapy, our data do not allow us to explore whether beta-blockers were effective in slowing the progression or decreasing the number of events. The timing of surgical repair of aortic dilation in patients with coarctation of the aorta also remains uncertain. Our data suggest that a more aggressive surgical approach should be required when both coarctation and BAV coexist.
Study limitations. The retrospective nature of this study may be considered an important limitation, and data should be confirmed by prospective studies. The most confusing factor to be noted in data analysis is the different profile of the three compared groups of patients. The prevalence of systemic hypertension was lower in patients with non-repaired mild coarctation of the aorta (group III), but there were few distinguishable differences in current age, gender, trans-coarctation peak pressure gradient, or prevalence of BAV among the three groups. Furthermore, surgical procedures performed on patients changed over time when a high prevalence of aneurysm formation late after patch aortoplasty was reported (1618). Despite this fact, we have not found significant differences in the prevalence of aortic complications between patients treated by patch graft aortoplasty or other surgical procedures. Although Doppler pressure gradients based on the Bernoulli equation might not be reliable for detecting re-coarctation, this variable was assessed in our study because complete data on catheterization or arm-leg pressure gradients were not available. Finally, the prevalence of aortic complications might be underestimated because noninvasive screening tests for early detection of aortic complications were not performed. Only those patients with a suspected aortic complication by clinical or echocardiographic examination underwent magnetic resonance angiography, computed axial tomography, or aortography. Although a combination of radiologic and clinical assessment plus transthoracic echocardiography and magnetic resonance angiography in patients with positive results may be an acceptable alternative for detecting aortic complications (21), systematic magnetic resonance screening is a "cost-effective" approach for early detection of aortic complications in adults with coarctation of the aorta, especially when a BAV coexists.
Conclusions. Severe aortic complications are prevalent in adults with repaired or non-repaired coarctation of the aorta. The most commonly encountered ones are ascending and descending true aortic aneurysms. However, false aneurysm, aortic rupture, dissection, mycotic aneurysm, and fistulae also should be considered. The risk of the development of aortic complications increases with age, and it is independently related to coexistence of a BAV. Intrinsic abnormalities of the aortic wall beyond that attributable to associated hemodynamic derangement or previous repair might be responsible for aortic complications. The association between a BAV and coarctation of the aorta would identify a more severe form of aortic wall disease. In the light of these results, close follow-up of all adults with coarctation of the aorta, either repaired or non-repaired, irrespective of hemodynamic status, should be advised for the early detection of aortic wall complications.
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