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J Thorac Cardiovasc Surg 2004;127:1474-1480
© 2004 The American Association for Thoracic Surgery
Surgery for congenital heart disease |
a Clinic for Heart Surgery, German Heart Center Munich, Munich, Germany
b Clinic for Orthopaedics, Technical University Munich, Munich, Germany
Received for publication September 3, 2003; revisions received November 11, 2003; revisions received November 18, 2003; accepted for publication December 2, 2003.
* Address for reprints: Sabine Bleiziffer, MD, Clinic for Heart Surgery, German Heart Center Munich, Lazarettstr 36, 80636 Munich, Germany
bleiziffer{at}dhm.mhn.de
| Abstract |
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METHODS: Ninety-five patients, 72 with right anterolateral thoracotomy and 23 with median sternotomy, who had corrective transatrial operations when they were younger than 12 years of age were contacted by questionnaire. The mean follow-up time was 23.1 years. Of these, 61 patients (46 thoracotomy and 15 sternotomy) were investigated clinically. Volume differences of the breasts were measured by 3-dimensional surface scanning. By using photographs of the upper chest, breast symmetry was described by an index. The degree of scoliosis was measured by clinical examination.
RESULTS: According to the questionnaire analysis, 76% (thoracotomy group) versus 39% (sternotomy group) thought that the cosmetic result was excellent (P = .008). Breast volume measurement showed a volume difference greater than 20% (left side larger than right) in 55% (thoracotomy) versus 0% (sternotomy). With our index, asymmetry in the lower part of the right breast occurred in 61% (thoracotomy) versus 0% (sternotomy; P < .001). A total of 6.6% of the patients had scoliosis, without any differences between groups.
CONCLUSIONS: Because our long-term follow-up in prepubescent female patients after right anterolateral thoracotomy revealed significantly impaired unilateral breast development, we propose to abandon right anterolateral thoracotomy in this subgroup of patients, although the subjective satisfaction with the cosmetic result was high. To avoid potential damage of future breast tissue, other surgical approaches, such as right posterior thoracotomy, should be considered. According to the orthopedic investigation, the surgical approach does not cause a higher rate of scoliosis.
It is assumed that the cosmetic outcome of ALA is superior to that of MS,6 especially in adult female patients,7 whose breasts are already developed.8 However, there are few data about breast development after ALA in prepubescent female patients.9 Therefore, we investigated a subgroup of female patients younger than 12 years of age at the time of operation and compared long-term cosmetic results after ALA versus MS. Also, we investigated the hypothesis that because of scarring, an increased rate of left convex thoracic scoliosis after ALA can be found compared with MS and the healthy population.
| Patients and methods |
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As a second step, 61 of these patients (46 with ALA and 15 with MS) were recruited for examination at our institution. The mean age of the patients was 29.6 ± 4.6 years, mean weight was 62.1 ± 9.7 kg, and mean height was 168 ± 7.5 cm. Electrocardiogram and transthoracic echocardiography were performed to assess the completeness of correction. Orthopedic specialists investigated the degree of scoliosis by clinical examination and 3-dimensional spine scanning (Formetric II; Diers, Wiesbaden, Germany).10 The patients were tested for thoracic or lumbar rotation by using a scoliometera specially designed inclinometer (Orthopedic Systems, Union City, Calif)in the Adams forward-bending test position after the leg length was evened out. The scoliometer was placed on the back at the apex of the asymmetry, perpendicular to the long axis of the body. According to Bunnell,11 scoliosis was clinically defined as a rotation 7° or more and a postural scoliosis between 3° and 6°. Additionally, we used the Formetric II apparatus for surface scanning of the breasts to measure volume differences. For these purposes, the data were converted into suitable data format (rek2raw) files and edited with specially programmed software in addition to the graphics program Amira 3.0 Dev (TGS, Metz, France).
Index method
By using photographs of the upper chest, indices were calculated to describe differences in the size and shape of the breasts. Index I describes asymmetry at the level of the nipples, and index II describes asymmetry at the level of the lower part of the breasts. An index of 0 indicates symmetrical breast development. The higher the index, the more likely that asymmetry of the breasts occurred (Figure 1). Informed consent was obtained from all patients included in the study.
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Statistical analysis
Data are presented as mean ± SD and as simple percentages. Questionnaire analysis was performed with the
2 test. Indices and volumetry data were analyzed with the Mann-Whitney test.
| Results |
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Echocardiography showed no residual ASD in any patient. Tricuspid regurgitation was found in 29 patients by visual assessment,12 and end-diastolic enlargement of the right ventricle was greater than 20 mm in 29 patients. Mild or moderate mitral reflux was ascertained in 11 patients.12 All patients had normal left ventricular function. Echocardiographic findings are summarized in Table 1.
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Seventeen women in the ALA group already had children. Four of them reported that they had produced less milk on the right side.
Orthopedic findings
The orthopedic examination revealed clinical scoliosis in 4 patients (6.6%), postural scoliosis in 42.6%, and normal posture in 31 (50.8%). In the group with scoliosis, 2 patients had had MS and 2 had had ALA. The lumbar rotation in this group was always to the left side (n = 4). The mean value was 10.25° (SD ± 5.3). The mean thoracic rotation, always to the right side, was 7° (SD ± 6.5).
Two of the patients had severe scoliosis. One had a left convex lumbar scoliosis of 19° and a thoracic rotation to the right side of 9° (ALA). The other patient had a right convex thoracic rotation of 18° and a left convex lumbar rotation of 7° (MS). Seven patients (11.7% of all patients) had a left convex thoracic spine as a postural scoliosis, with a mean rotation of 3.4° (SD ± 1.3; Table 2
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The length of the scar was comparable: 19.8 cm in the ALA group versus 20.8 cm in the MS group (P = .557, NS). A total of 64% (ALA group) versus 22% (MS group) thought that the right breast was smaller (P = .015).
A total of 31% (ALA group) versus 13% (MS group) reported numbness (P = .313, NS), and 7% versus 4% reported pain in the region of the scar on exertion or during a change of weather (P = .96, NS). A total of 76% (ALA) versus 39% (MS) considered the cosmetic result excellent (P = .008). The questionnaire results are summarized in Table 3.
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| Discussion |
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After its introduction in 1957 by O. C. Julian,16 the MS was the universal method of exposure for most cardiac procedures. However, especially in patients with simple congenital cardiac defects, a prominent midline scar remains an unsightly and lifelong reminder of an otherwise low-risk and successful procedure.
Alternative approaches with the aim of a nearly invisible scar remained a surgical goal. A bilateral submammary skin incision with transverse sternotomy was 1 example.17 However, frequent complications, including breast maldevelopment, reduced areola sensitivity, and hematomas, restricted the use of this approach.
Since the early seventies, ALA has been used as a safe alternative for MS. Review of the literature revealed that most authors favor the cosmetic advantage of ALA,6,7,18-21 because the scar can be hidden easily when the patient is adequately dressedthe scar disappears under the breast.1 Patients' acceptance of this surgical approach is very high. In our study, 76% stated that the cosmetic result was "excellent."
Beside this cosmetic consideration, which will be discussed later in more detail, part of our study aimed to evaluate whether this right lateral scar increases the risk of left convex thoracic scoliosis. The prevalence of scoliosis in the healthy population varies from 1% to 21% because of the different criteria used for the detection and diagnosis of scoliosis.22 However, in contrast to our hypothesis of the potential shortening effect of the scar tissue, we found no higher incidence of left convex deformities (Table 2). We found that the surgical approach does not cause a higher rate or a preferential direction of scoliosis in the studied patients compared with reference data.
Another issue is potential phrenic nerve damage (PND) after ALA. We and Dabritz and associates1 (87 patients) found no evidence of PND, whereas Helps and colleagues23 observed PND in an unusually high rate of 31% (5/16 patients). The exact operative techniques that are known to affect nerve function may be multifactorial (direct injury, electrocautery used near a nerve, extensive thymus dissection, placement of pericardial stay sutures and traction, internal jugular vein cannulation, and topical cooling). However, in our opinion, the anterolateral approach can be used safely by appreciating the course of the nerve, pulling adequately on the pericardial traction sutures, and avoiding topical cooling.
To avoid breast asymmetry after ALA, Dietl and colleagues24 proposed a subpectoral rather than transpectoral approach. The mean age of their patients was 21.5 years (range, 8-38 years). Their patient selection, however, obscured breast maldevelopment in the prepubescent girls, because the follow-up time reached only 5 years. We believe that the major drawback of most publications6,7,18-21 is that the investigators did not differentiate between children before breast development and female patients with defined submammary grooves in an adequately large long-term cohort. Recently, Tiete and associates25 published their results after ALA in prepubescent girls (age, 5.8 ± 4.1 years), but again the follow-up time was only 4.8 ± 4.6 months, which must be considered too short to detect breast maldevelopment.
Only Cherup and colleagues9 measured volume differences of the breast and pectoral muscle in 22 men and women who had undergone right or left anterolateral or left posterolateral thoracotomy as children. Follow-up time was approximately 20 years. They found a volume difference greater than 20% in 60% of the patients by a method using plaster molds. Unfortunately, this publication lacks a description of the number of female patients and age distribution. Furthermore, 3 different surgical approaches were investigated in a small cohort of only 22 patients without splitting up the results.
Our study is unique in that it measured breast volume differences after 1 defined surgical approach (ALA). Our proposed index method and the use of the Formetric II instrument for objective measurement of breast volume differences have not previously been described in the literature.
What may be the reasons for later breast maldevelopment after ALA? Infant cadaver dissections showed distribution of breast bud tissue (mamma ductules and glands) in a periphery of at least 1.5 cm around the nipple-areola complex.9 These findings support the assumption that a dissection in this area may damage future breast tissue with the consequence of incomplete breast development.
It is well known that breast asymmetry also occurs in the healthy population. Loughry and colleagues26 measured the breast volumes of 598 women by stereophotogrammetry. They found a volume difference of 20% or less in 70% of the women. In the cases of volume difference, the proportion of a smaller right breast tended to be slightly higher, at 4% (NS). This indicates that a volume difference of up to 20% might be normal and that the right breast is more often the smaller one. In contrast, in our study 93.5% of the ALA group had a smaller right breast, with an average volume difference of 27%, compared with 8% in the MS group. A volume difference of 20% or less (compared with the smaller side) occurred in only 38% (ALA) versus 92% (MS) or 70% (healthy population26). Our calculated index II, which describes the asymmetry of the lower part of the breasts, was more than 3 SD above normal distribution in 61%, indicating a maldevelopment especially in this region after ALA.
Our findings question the use of ALA in prepubescent female patients. We found the right breast development to be significantly impaired. However, questionnaire analysis showed that most patients preferred a lateral scarring. This underlines the patient's wish for a cosmetically favorable surgical approach. As proposed by Grinda and associates8 and Bauer and associates,27 ALA should therefore be chosen only in female patients whose breasts are already developed and whose submammary grooves are well defined.
A cosmetically more favorable surgical approach for prepubescent girls might be a more posterior right lateral thoracotomy (PLA). It was first described by Sousa Uva28 in 1995 and is now successfully performed by several institutions. Equally, Liu and colleagues29 describe a lateral thoracotomy between the anterior and posterior axillary line for the correction of cardiac defects in children to avoid breast maldevelopment. The growing experience with PLA supports its being a safe and low-risk procedure. Damaging of future breast tissue through this incision is not likely.
Still, there are some limitations for PLA. For example, the presence of a left superior vena cava draining into the coronary sinus is a contraindication.5 Also, patients who weigh less than 16 kg should not undergo lateral thoracotomy because of poor exposure due to small size. In these cases, we favor a lower vertical skin incision for a subxiphoid approach, with or without partial sternotomy. Levinson and Fonger3 were the first to describe an ASD closure without sternotomy in 1997. Recently, Hagl and colleagues30 introduced their results after a subxiphoid approach without sternotomy, with partial sternotomy, or limited skin incision with full sternotomy in children. Safety, bypass time, and crossclamp time, as well as the duration of hospital stay, were comparable to those of the standard procedure with full skin incision and full sternotomy. Other authors also describe the lower skin incision with or without partial sternotomy as a safe procedure with good exposure, especially for transatrial corrections in children.2 Cosmetic results are still superior to a total sternotomy because the remaining scar does not cross the upper part of the anterior thorax, the so-called décolleté, which was the most bothersome item for female patients who underwent MS, as shown in our study.
In conclusion, for cosmetic advance, surgical approaches other than ALA, such as right posterolateral thoracotomy, should be considered as a first choice for younger girls. However, in adult women, right anterolateral thoracotomy still achieves the most favorable cosmesis.
| References |
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