Contrapulsación intraaórtica en cirugía coronaria: factores predictivos de mortalidad hospitalaria / Intraaortic countenpulsation in coronary surgery: prediction factors of hospital mortality

La contrapulsación aórtica (CPIA) es el método más básico y difundido de asistencia circulatoria. Su utilidad en el síndrome de bajo gasto postcardiotomía aún comporta alta mortalidad. Pretendemos identiificar factores relacionados con el perfil preoperatoriodel paciente y el procedimiento realizado, que tenga carácter predictivo de mortalidad hospitalaria (MH) en la utilización de CPIA por bajo gasto tras cirugía coronaria. Entre septiembre de 1995 y abril de 1998 hemos intervenido 382 pacientes coronarios. Se utilizó CPIA en 54 casos (14 por ciento). Analizamos 50 variables pre e intraoperatorias de potencial carácter predictivo en el grupo A (29 supervivientes) y B (25 fallecidos). La MH por CPIA en coronarios fue del 46 por ciento. Todos los scores de riesgo preoperatorio fueron más elevados en el grupo B, aunque el score de Parsonnet mostró diferencias significativas (grupo A: 6 vs B: 12,9) (p<0,01). La mayor utilización de venas (grupo A:1,3 vs B:2) (p<0,05), el menor uso de injertos arteriales (A:79 por ciento vs B:56 por ciento) y el carácter emergente de la cirugía (A:7 por ciento vs B:20 por ciento) también se relacionaron con la MH. La CPIA en el sindrome postcardiotomía tras revascularización coronaria aún presenta altas cifras de MH. En nuestra experiencia la MH se asocia a un perfil de riesgo elevado del paciente, así como con el tipo de injerto empleado y con el carácter emergente de la cirugía

Early open mitral commissurotomy: long-term results.

It has frequently been suggested that early mitral commissurotomy could improve long-term results in patients with severe mitral stenosis. However, the real advantages of this procedure have yet to be demonstrated. To evaluate this hypothesis, we retrospectively studied 397 patients who underwent operation for mitral stenosis in our unit between 1978 and 1988. Forty of these patients (group I) fulfilled the criteria for early mitral commissurotomy: being young (average age 33 years), being asymptomatic or showing few symptoms, and being in sinus rhythm. The remaining 357 patients who underwent operation during the same period of time served as control (group II). Mitral valve replacement (p < 0.05) and associated tricuspid annuloplasty (p < 0.05) occurred less frequently in patients from group I than it did in patients from group II. Survival after 11 years for patients with early mitral commissurotomy was 100%, 90% of whom were in functional class I, were in sinus rhythm, and were receiving no medication whatsoever. Ninety-six percent of these patients were free of complications after 11 years, compared with 73% of patients in group II (p < 0.05). In our opinion, these results support the use of early mitral commissurotomy for young patients in sinus rhythm, who are symptom free, who are and who have a mitral valve area is 1.3 cm2 or less.

Pulmonary valve endocarditis during puerperal sepsis.

A case of pulmonary valve endocarditis caused by Staphylococcus aureus during puerperal sepsis in a female patient is reported. The M-mode and two dimensional echocardiographic finding are described. A review of the literature shows that this entity is rare. A large vegetation in the leaflet of the pulmonary valve was excised and the patient recovered after a full course of antibiotics.

[Myocardial revascularization and complete correction of tetralogy of Fallot in an adult. A case report]. / Revascularización miocárdica y corrección completa de la tetralogía de Fallot en el adulto. Presentación de un caso.

The case is reported of a 62 year-old male having a clinical history of grade II dyspnoea from 9 year ago and recently showing grade II angina. He had presented mild cyanosis. Suspecting the existence of coronary arteriosclerosis, and with the clinical diagnosis of tetralogy of Fallot based particularly on two-dimensional and M-mode echocardiography, and angio-hemodynamic study was made which confirmed the presence of congenital heart disease and also revealed significant coronary lesions of the circumflex and right coronary arteries. The patient underwent surgery which involved complete correction of the tetralogy of Fallot and the placing of two aortocoronary grafts onto the circumflex and right coronary arteries. Favorable progress was noted both immediately after operation and 6 months later. Although cases have been described of Fallot disease associated with acute myocardial infarction, we believe that this is the first time a patient has undergone myocardial revascularization at the same time as undergoing complete correction of the congenital heart disease.

A comparison of repair and replacement for mitral stenosis with partially calcified valve.

From January 1978 to December 1987 we operated on 135 patients with calcified mitral stenosis. In 60 patients a conservative operation was performed (group I). Nine patients required mitral annuloplasty associated with the commissurotomy. The other 75 patients underwent mitral valve replacement (group II). In 37 patients a mechanical prosthesis was used and in 38 a biologic one. The patients given mitral valve replacement had a more heavily calcified valve than those undergoing a conservative procedure. Twenty-one patients (12 from group I and 13 from group II) required associated tricuspid annuloplasty. The mean follow-up time was 69.1 months (1 months to 10 years). There were no significant differences between the two groups in terms of operative death (0% and 4%, respectively), postoperative functional class, actuarial survival rate at 10 years (84% and 96%, respectively), and probability of freedom from thromboemboli at 10 years (98% and 96%, respectively). However, the probability of freedom from reoperation at 10 years significantly favored the conservative surgery group (84% and 69%, respectively, p less than 0.01). Finally, the probability of freedom from complications at 10 years was also significantly higher in the conservative surgery group (82% and 64%, respectively, p less than 0.005). Because of these results we believe that conservative surgery is, at present, a better alternative than mitral valve replacement for patients with partially calcified mitral stenosis.

Conservative operation for mitral stenosis. Independent determinants of late results.

A retrospective study was designed to define the independent determinants of late results in 282 consecutive patients operated on for mitral stenosis between 1978 and 1985. A total of 25 variables were investigated by multivariate discriminant analysis for their possible influence on symptomatic outcome, subsequent reoperation, postoperative thromboembolism, and death. All the patients underwent a conservative mitral valve operation. In addition, 25 patients required concomitant tricuspid annuloplasty. The surgical mortality rate was 1.4% and the late mortality, reoperation, and thromboembolism rates were, respectively, 0.14%, 0.80%, and 0.95%/pt-yr. Actuarial probability of complication-free survival at 8 years was 83% +/- 3.7%. Left atrial size on the M-mode echocardiograms, tricuspid annuloplasty, mitral annuloplasty, presence of left atrial thrombus, male gender, and separation of subvalvular apparatus portended a significantly higher likelihood of poor postoperative symptomatic status (p less than 0.0005). Preoperative mild mitral regurgitation, E to F slope on the M-mode echocardiogram, and tricuspid annuloplasty had significant influence on the need for late reoperation (p less than 0.05). Postoperative atrial fibrillation, mitral valve amplitude on the M-mode echocardiogram, preoperative embolism, and residual mitral incompetence had an independent predictive power for postoperative thromboembolism (p less than 0.05). Finally, preoperative atrial fibrillation, preoperative cardiothoracic ratio, postoperative left atrial size, and postoperative atrial fibrillation all influenced the probability of long-term complications. These results suggest that earlier operation should be considered in patients with mitral stenosis, to increase the complication-free survival rate.

Mitral and aortic valve decalcification by ultrasonic energy. Experimental report.

In this investigation we used ultrasonic energy to decalcify 10 mitral and six aortic valves after they had been surgically removed. The calcium was disintegrated in all cases and normal valvular tissue was preserved. The fragments of disintegrated calcium were collected in a suction bottle, which prevented peripheral embolism. The ultrasonic urologic probe is an unwieldy instrument for cardiac surgery, and we suggest the manufacture of a new probe for clinical use in our specialty.

Conservative operation for mitral stenosis with densely fibrosed or partially calcified valves. An eight-year evaluation.

Of 284 patients undergoing open mitral commissurotomy for mitral stenosis from January 1978 to December 1985, 81 patients had a densely scarred or partly calcified valve. In this study, we evaluated the postoperative results in these 81 patients. There were no operative or late deaths. Seventy-seven patients (95%) are in Functional Class I or II. Three patients required reoperation 3, 30, and 50 months after the initial procedure because of moderate or severe residual mitral regurgitation. After valvotomy there were four episodes of embolism. The actuarial rate of freedom from any complication (mortality, reoperation, congestive heart failure, and thromboembolic events) was 89.3% +/- 3.9% (mean +/- standard error of the mean) 8 years after operation. We conclude that for a follow-up period of 8 years, the stenotic mitral valve with anatomical deformities can be salvaged with satisfactory results. Therefore, we believe that this approach, at present, is a better alternative than prosthetic replacement with any type of valve presently available.

Accurate length adjustment of right or circumflex coronary artery bypass grafts.

A simple method is described for the accurate adjustment of the length of right and circumflex coronary grafts. The essential feature of the technique is the use of a marking suture initially positioned in the pericardium for future reference. The technique has been adopted and successfully used by us over the past year.

Intraoperative contrast two-dimensional echocardiography. Evaluation of the presence and severity of aortic and mitral regurgitation during cardiac operations.

We have used contrast two-dimensional echocardiography in the intraoperative evaluation of aortic and mitral regurgitation in 35 patients undergoing cardiac operations. All of them underwent previous cardiac catheterization in order to document the presence and severity of regurgitation. With the pericardium open, a catheter was introduced into the left ventricle (to document mitral regurgitation) or into the ascending aorta (to document aortic regurgitation). The two-dimensional echocardiographic probe was placed on the anterior surface of the right ventricle to obtain a basal image, equivalent to a conventional parasternal longitudinal view. Dextrose in water (5 ml) was rapidly hand-injected through the catheter, while echocardiograms were recorded on videotape. The observation of contrast medium (microbubbles) flowing in the retrograde direction through the incompetent valve was carefully evaluated with the same scoring system used in the hemodynamic laboratory. In 34 cases there was agreement between angiographic and echocardiographic evaluation of the presence and severity of mitral and aortic regurgitation. Only one case was evaluated as mild aortic regurgitation by angiography and moderate aortic regurgitation by echocardiography. There were no false positives or false negatives in the study. In view of the high degree of correlation between contrast two-dimensional echocardiography and hemodynamic data, we suggest that our method is an important tool for the cardiac surgeon. In addition, the present approach overcame the disadvantages of the conventional intraoperative methods, most of which are performed in a nonbeating or fibrillating heart.

[Our experience in heart surgery in early childhood (children less than 2 years old)]. / Nuestra experiencia en la cirugía cardiaca en la primera infancia (less than dos años).

We review 109 patients with congenital heart disease under (two year of life, surgically treated between June 1978 and October 1981; 44% were under six months and 71% were under one year. Fifty six patients were operated under cardio-pulmonary by-pass, in 41 we used deep hypothermia with total cardio-respiratory arrest, 21% of them were under three months of life an 53% under one year. We present the morbidity and mortality together with the pulmonary management. Eighty five percent of the cases remained intubated postoperative by for less than 12 hours. The postoperative pulmonary evolution was quite similar for different types of congenital heart disease, such as T. Fallot, A-V canal, transposition, etc., and there was no statistically significant difference between them in terms of respiratory assistance and pulmonary complications. Eleven patients died (19%), all of them under six months of life. In 53 patients operated, without extracorporeal circulation, 38 had total correction and 15 palliative procedures. The mortality in this group was 9% (5 cases), all of the under one month of life. The global mortality was 14%. We discuss our present surgical indications in view of our results.

Anoxic cardiac arrest: Its effect on myocardial mitochondrial metabolism.

Forty eight healthy dogs are subjects to cardiopulmonary bypass and divide into two groups according to whether the perfusion is performed in normothermia or moderate hypothermia (30 degrees C). The effects on oxidative phosphorylation and mitochondrial respiration, produced by increasing periods of myocardial anoxia from aortic cross clamping, are studied. A clear correlation is found between the disturbances of mitochondrial metabolism and the future cardiac recovery. Hypothermia shows a protective effect on the anoxic myocardium. It is concluded that the period of absolute safety in cardiac anoxia, as far as mitochondrial function is concerned, is 15 minutes in normal thermic perfusion and 90 minutes in moderately hypothermic ones.