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Eur J Cardiothorac Surg 2005;27:481-487
© 2005 Elsevier Science NL
a Department of Cardiothoracic Sciences, Second University of Naples, Naples, Italy
b Department of Cardiovascular Surgery and Transplants, Monaldi Hospital, Naples, Italy
Received 17 September 2004; received in revised form 9 December 2004; accepted 13 December 2004.
* Corresponding author. Address: University of Naples, Palazzo D'Anna, Via Posillipo 9, 80123 Naples, Italy. Tel.:+ 39 081 769 1893; fax: +39 081 546 4594. (E-mail: maurizio.cotrufo{at}unina2.it).
| Abstract |
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Key Words: Ischemic cardiomyopathy Ventricular restoration Heart transplantation Quality of life
| 1. Introduction |
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| 2. Materials and methods |
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50mL/m2 and an ejection fraction
35%. Patients with isolated lateral or posterior wall aneurysm were not considered in the definition of ischemic cardiomyopathy. The analysis included 111 patients of both sexes (85 males and 26 females), between 38 and 76 years of age (mean age 57.3±8.4), divided into two groups. Group A included 42 patients (mean age 62.4±7.9 years; 26 female) who were managed with ventricular restoration procedures (including endoventricular circular patch plasty, coronary artery by-pass grafting and mitral repair). Group B included 69 recipients of orthotopic cardiac transplantation (mean age 54.3±7.2 years; 10 female).
2.2. Patient-procedure matching criteria
Choice of surgical treatment was based on morphological and functional cardiac parameters. In particular, as authoritatively outlined by Dor [3]: (a) severely depressed right ventricular function, (b) lack of ischemic areas suitable for revascularization, (c) lack of contraction improvement of basal segments during echo-dobutamine contraindicated surgical reshaping leaving transplantation as the only possible therapeutic option. Age proved a relative contraindication to heart transplantation given the shortage of organ disposition and the likelihood of decompensation during the waiting time.
2.3. Surgical procedures
All the restoration procedures were performed by means of a median sternotomy using a normothermic cardiopulmonary bypass, aortic cross clamp and myocardial protection by means of warm blood cardioplegia. The strategy included: (a) endoventricular patch plasty according to the Dor's technique or its modified versions; (b) correction of mitral valve regurgitation by means of annuloplasty and/or valvuloplasty, according either to Bolling or Alfieri's techniques (14.3%); (c) coronary bypass grafting, in order to achieve the maximal possible completeness of revascularization (38 patients: mean number of grafts 2.36±0.67). In patients with preoperative ventricular arrhythmias (14.3% of the entire group), extensive circumferential endocardial resection according to Harken was performed without intraoperative mapping in the early phase of our experience, while since 2002, mapping-guided cryoablation was performed [4]. Prophylactic intra-aortic balloon counterpulsation was instituted soon before induction of anesthesia in those patients with more pronounced preoperative signs of congestive heart failure (23.8% of the entire group). Such approach aimed to grant hemodynamic stability during the early stages of the procedure and to prevent low post-operative cardiac output. Follow-up management was performed by our outpatient clinic physicians. Patients were maintained on an optimised regimen for treatment of heart failure that included use of ß blockers and angiotensin-converting enzyme inhibitors.
As far as heart transplant procedure is concerned, donor heart procurement was performed with standard technique. Heart were protected with 2L of cold (48°C) Celsior solution and topical saline slush. Excised grafts were then immersed in 1L of cold Celsior solution and stored under ice in closed cardiac storage container for transportation. All recipients underwent standard orthotopic transplantation using the atrial anastomotic technique. Principles of post-transplant care have been described elsewhere [5].
2.4. Quality of life assessment
All patients filled in a short Italian version of the World Health Organization Quality of Life Questionnaire [6]. The WHOQOL-BREF produces a quality of life profile. It is possible to derive four domain scores. There are also two items that are examined separately: question one asks about an individual's overall perception of quality of life and question two asks about an individual's overall perception of his/her health status. The four domain scores denote an individual's perception of quality of life in each particular domain (physical, psychological, social, and environmental). Domain scores are scaled in a positive direction (i.e. higher scores denote higher quality of life). Raw scores were converted into a 0100 scale according to the specific guidelines [7].
2.5. Follow-up and statistical analysis
All preoperative and hospital data of patients undergoing surgical procedures in our department have been recorded prospectively in a computerized archive since 1990. Information regarding follow-up was obtained for all hospital survivors and was 100% complete. Data were collected either through outpatients clinic reports (100% for the heart transplant recipient group; about 80% for the ventricular restoration group) or by telephone interview with the patients or the referring physician. Hospital mortality was defined as death within the 30th post-operative day. Treatment-related late mortality was defined as cardiac death in the restoration group and cardiac deaths (due to acute or chronic rejection) or immunosuppressive therapy related deaths (infections, PTLD and malignancies). In group A post-operative angina or acute myocardial infarction along with major arrhythmias and cardiac decompensation represented major cardiac events. Acute rejection>2 and clinically significant graft vasculopathy represented major cardiac events in group B. SPSS software (version 10.1; Chicago, IL, USA) was employed for statistical analysis. Data were expressed as mean±SD or counts and percentages when appropriate. Differences in categorical variables were compared by means of the
2 Pearson's test or Fisher's exact test. Continuous variables were analyzed with two-tailed Student's t-test. Incidence of post-operative events were presented as absolute frequencies and linearized rates (%/pts/months) and compared with the likelihood ratio test. Actuarial survival, freedom from re-hospitalisation and from cardiac failure were calculated with the product-limit method. Comparisons between groups were performed with the log-rank test. Statistical significance was defined as P
0.05.
| 3. Results |
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| 4. Discussion |
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Due to the aging of population and the successfulness of emergency interventions, the burden of ischemic dilated cardiomyopathy is emerging as the major etiologic factor in the increasing public health problem of heart failure. Cardiac transplantation continues to be an extraordinarily important therapeutic option for selected patients. Nonetheless, limitations with organ supply, along with medical and social issues restrict the use of this strategy. The improvement in the medical management and in the outcomes of other surgical procedures have changed the scenario and the therapeutic challenge today is to choose the most appropriate strategy for each patient.
Other studies have recently focused on the critical role of decision making in end-stage coronary artery disease and compared outcomes of heart transplantation and conventional approaches [8]. Cope and co-workers, comparing in-hospital costs and early outcome, concluded that non-transplant surgery yields comparable early outcomes, being markedly less expensive. In addition they noted that transplantation does not confer any long-term survival benefit in patients with ischemic cardiomyopathy [9]. In our experience, the risk of hospital mortality in the restoration group resulted to be more than twice the risk in the other group, although this difference did not result significant, due to the low numbers. This is partly explained by the older mean age of group A patients. It has been already found that longer time to surgery after myocardial infarction, its posterior location, lower preoperative left ventricular ejection fraction, higher pulmonary artery occlusive pressures, and significant mitral regurgitation negatively affect left ventricular remodelling, the possibility for successful surgical restoration, and clinical outcomes [1013]. In this perspective, the high hospital mortality rates in this series may also reflect a selection bias, as well as the learning curve effect of our staff. However, treatment-related complications and deaths in the follow-up occurred in the transplant group at higher rates than in patients undergoing ventricular restoration. All in all, at mid-term follow-up the survival benefit offered to the two patient groups seems nearly equal. Lower post-operative morbidity and mortality in patients undergoing ventricular restoration is expected when a more aggressive approach is adopted, with respect to surgical timing and use of associated procedures for arrhythmias and secondary mitral regurgitation [1,3,10]. In-depth knowledge of the multifactorial pathophysiology of post-ischemic remodelling has stressed the need for a tailored surgical approach suggesting that a combination of multiple techniques fare better than isolated procedures and that adequate post-operative medical therapy is a main stem [14,15]. Long term fate of survivors in the restoration group may be strongly influenced by concomitant revascularization procedures, that, when feasible, was routinely a part of the strategy in this study.
Several studies addressed the long term outcomes of heart transplant in the setting of ischemic cardiomyopathy as compared to other aetiologies [16,17]. Actuarial survival for this patient subset proved poorer and this discrepancy increased with time after transplant. More, ischemic recipients were more functionally impaired, displayed an higher NYHA status, and experienced a significantly higher incidence of transplant coronary disease, also reflecting in higher risk of 1 and 5-year mortality [18]. In the present study, among post-operative outcomes of transplantation, chronic rejection was defined as clinical manifestation of coronary allograft vasculopathy with moderate-severe functional impairment, excluding early signs of graft vasculopathy without cardiac failure. This accounts for the relatively low incidence of total cardiac events after transplantation for a group of ischemic cardiomyopathy patients, 36 and 10% of whom had, respectively, diabetes and peripheral vascular disease.
Although the two surgical strategies compared in the present study are not actually alternative, since patients undergoing transplant were considered unsuitable for any other surgical therapy, almost all patients receiving ventricular restoration could have been offered heart transplant as well. After the present study's results, it is expected that they would have not experienced markedly better results in terms of clinical outcomes and of quality of life. Although medical therapy can nowadays allow for a prolonged pre-operative period of relative compensation, clinical outcomes of ventricular restoration could further improve, provided earlier surgical indications will be considered [1,10]. Given the above mentioned shortage of donors and the greater sanitary burden entailed by transplantation, the resulting message is that a tailored approach seems rationally justified, implying accurate screening of patients with ischemic cardiomyopathy with focus on features indicating ventricular restoration.
Indeed, a significantly higher number of patients in group A were in NYHA class II when compared to group B, even though the finding of post-operative functional class improvement was a constant observation also in the restoration group. However, NYHA class is an incomplete, subjective and scarcely reproducible parameter for quality of life assessment. The lower freedom from re-admission to hospital in the transplant group clearly reflects the higher incidence of early acute events requiring specialist assistance, when compared to ventricular restoration patients, who generally require more cardiologic medical therapy, but only ambulatory consultations. One of the most important indicators of the success of a therapeutic intervention for the failing heart is its impact on the patients' quality of life. Indeed, together with outcome measures of survival, morbidity and physiologic response, quality-of-life benefits have to be factored in the decision making phase of surgical management. The WHOQOL-BREF has good discriminative capacity, content validity, internal consistency and test-retest reliability. It has been validated in other studies of chronic illness as well as in comparing heart transplantation to alternative surgical strategies [19]. In the present series, both the approaches effectively improved perceived quality of life in properly selected patients. Better physical scores in the transplant recipients confirm the major and more uniform increase in functional status reported above. Drawbacks of the substitutive strategy (namely higher psychological stress, deteriorated self image, and anxiety) affect the psychological and social relation scores. The comparable results in the environmental domain are to be considered gratifying, in the light of the significantly older age in the restoration group.
4.1. Study limitations
Present study suffers from the potential limitations of any retrospective analysis and from the smallness of the two unbalanced sample groups. Nevertheless, the retrospective nature of the study limited the uniformity of the reported series only in terms of surgeons' technical experience and knowledge of the correct indications and contraindications, that was still an ongoing issue. On the contrary, nonrandomized design is maybe obligatory in this setting: patients eligible for heart transplantation strongly differ from those susceptible of surgical restoration as to stage of the disease and echocardiographic preoperative features. Beside the defining criteria of ventricular end diastolic volume and ejection fraction, as stated in the method section, other factors, such as viability of basal segments and potential for remodelling differentiated one group from the other and those differences could not have been ignored even in an hypothetical prospective trial, for the sake of the intention to treat.
4.2. Conclusions
Ventricular restoration procedures proved in a mid-term follow-up a valuable tool in the treatment of patients with extensive ischemic cardiomyopathy. If treated by heart transplantation, these patients are likely to experience higher rates of re-hospitalization, even though with a risk of hospital mortality that is by trend lower. In the mid-term ventricular restoration provides a significant improvement in cardiac function allowing for a satisfactory quality of life. A comprehensive surgical approach combining multiple techniques tailored to address all pathophysiologic factors of the individual patient is crucial.
| Appendix A. Conference discussion |
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Would you comment on the heart transplant situation in our country, in Italy. Do you know what number of patients are transplanted in Italy?
Dr Cotrufo: Every year?
Dr Menicanti: Yes.
Dr Cotrufo: About 300 patients are transplanted every year, and almost the same number are dying because the organs are not available. So I agree with you that really every case should be studied in order to verify if there are any options other than transplant.
| Footnotes |
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| References |
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