Rotura del septum interventricular post infarto agudo al miocardio: una complicación potencialmente letal Revisión de la literatura a propósito de un caso clínico / Ventricular septal rupture after acute myocardial infarction: a potentially lethal complication Case report and literature review

Rupture of the ventricular septum with the appearance of an interventricular communication is an infrequent and life-threatening mechanical complication after acute myocardial infarction. The advent of coronary reperfusion therapies has reduced the incidence of this complication, but mortality remains high. The clinical presentation varies from mild compromise with exertional dyspnea to severe compromise with cardiogenic shock. In this pathology, early diagnosis is fundamental and surgical repair is the treatment of choice. In this article we report an interesting clinical case about a 77-year-old woman who was belatedly referred to our hospital and diagnosed with postinfarction rupture of the ventricular septum with an unfortunately fatal evolution. Relevance of this case lies in its atypical clinical presentation which led to a delay in diagnosis and a missed opportunity for early reperfusion therapy. An updated literature review about rupture of the ventricular septum complicating acute myocardial infarction was carried out.

Techniques, timing & prognosis of post infarct ventricular septal repair: a re-look at old dogmas

Abstract Objective: The study aimed to identify the factors affecting the prognosis of post myocardial infarction (MI) ventricular septal rupture (VSR) and to develop a protocol for its management. Methods: This was a single center, retrospective-prospective study (2009-2014), involving 55 patients with post MI VSR. The strengths of association between risk factors and prognosis were assessed using multivariate logistic regression analysis. The UNM Post MI VSR management and prognosis scoring systems (UPMS & UPPS) were developed. Results: Thirty-day mortality was 52.5% (35% in the last 3 years). Twenty-eight (70%) patients underwent concomitant coronary artery bypass grafting. Residual ventricular septal defect was found in 3 (7.5%) patients. The multivariate analysis showed low mean blood pressure with intra-aortic balloon pump (OR 11.43, P=0.001), higher EuroSCORE II (OR 7.47, P=0.006), higher Killip class (OR 27.95, P=0.00), and shorter intervals between MI and VSR (OR 7.90, P=0.005) as well as VSR and Surgery (OR 5.76, P=0.016) to be strong predictors of mortality. Concomitant coronary artery bypass grafting (P=0.17) and location (P=0.25) of VSR did not affect the outcome. Mean follow-up was 635.8±472.5 days and 17 out of 19 discharged patients were in NYHA class I-II. Conclusion: The UNM Post-MI VSR Scoring Systems (UPMS & UPPS) help in management and prognosis, respectively. They divide patients into 3 groups: 1) Immediate Surgery - Patients with scores of <25 require immediate surgery, preferably with extracorporeal membrane oxygenation support, and have poor prognosis; 2) Those with scores of 25-75 should be managed with "Optimal Delay" and they have intermediate outcomes; 3) Patients with scores of >75 can undergo Elective Repair and they are likely to have good outcomes.

Cirugía de la comunicación interventricular post infarto: análisis de los últimos 22 años / Surgery for post infarction ventricular septal defect: a 22-year experience

Introducción: El desarrollo de una comunicación interventricular en la evolución de un infarto miocárdico es una complicación muy grave, aunque infrecuente. Objetivo: Comunicar nuestros resultados con el tratamiento quirúrgico de pacientes con comunicación interventricular post infarto (CIVPI) intervenidos en los últimos 22 años. Método: Analizamos en forma retrospectiva los antecedentes de los pacientes intervenidos entre Enero de 1991 y Diciembre de 2012. Revisamos fichas clínicas, protocolos operatorios y certificamos la mortalidad con el Registro Civil e Identificación de Chile. Resultados: Operamos 43 pacientes, edad promedio de 66,6 +/- 10,2 años. El 58 por ciento eran hombres, de menor edad que las mujeres (63,1 +/- 10,8 vs 71,5 +/- 6,9 años, p=0,006). El tiempo promedio entre el diagnóstico de infarto y de CIVPI fue 10 +/- 15 días. El 74 por ciento fueron intervenidos de urgencia. La CIVPI fue anterior en 58 por ciento. Se realizó revascularización miocárdica concomitante en el 58 por ciento. Trece pacientes fallecieron (30 por ciento) en el posoperatorio. Factores de riesgo de mortalidad operatoria fueron: cirugía de urgencia ( p = 0,019]) y uso de balón intra aórtico (p = 0,006). La cirugía realizada después de las 24 horas del diagnóstico tuvo una mortalidad significativamente menor (7,7 por ciento, p=0,033). El seguimiento promedio fue de 8,36 +/- 5,3 años. La supervivencia alejada, excluida la mortalidad operatoria, a 5 y 10 años, fue 93 por ciento y 71 por ciento, respectivamente. Conclusión: La CIVPI tiene elevada mortalidad operatoria, especialmente en pacientes intervenidos de urgencia y en los que requirieron balón de contra pulsación, pero la supervivencia alejada de los sobrevivientes es muy satisfactoria.

Background: The development of a ventricular septal defect (VSD) after myocardial infarction is a rare but very serious complication for which the treatment of choice is surgical repair. Aim: To report our results with patients operated on for post-infarction VSD in the last 22 years. Methods: This is a retrospective review of all patients operated for post infarction VSD between january 1991 and december 2012. We reviewed all clinical charts and operative notes. Longterm mortality was certified by the "Registro Civil e Identificación de Chile". Results: Fourty three patients with a mean age of 66.6 +/- 10.2 years underwent surgical repair. Fifty eight percent were males. The average time between myocardial infarction and the diagnosis of vsd was 10 +/- 15.2 days. Seventy four percent of patients were operated on as an emergency. In 58 percent of cases the VSD was located in the anterior septum. Myocardial revascularization was performed in 58 percent. Thirteen patients died for an operative mortality of 30 percent. Risk factors for operative mortality were emergency surgery (p = 0,04) and the use of intraaortic balloon pump (p = 0,004). Non emergency surgery had a much lower mortality rate ( 7,7 percent, p = 0,033). Survival excluding operative mortality at 5 and 10 years was 90 percent and 71 percent, respectively. Conclusions: Operative mortality for repair of post infarction VSD remains high, mainly in patients undergoing an emergency operation. Surgical survivors have a very good life expectancy.

Ruptura de parede septal e corda tendínea de valva tricúspide após infarto audo do miocárdio / Ventricular septal perforation and rupture of the chordae tendineae of the tricuspid valve after acute myocardial infarction

Ruptura de parede septal (RPS) no infarto agudo do miocárdio (IAM) é uma complicação com alta mortalidade, com incidência de 0,2% na era de reperfusão miocárdica. Relata-se um caso de paciente com IAM associado à RPS, e possível rotura de cordas tendinosas da valva tricúspide.

Postinfarction ventricular septal perforation (VSP) is high-mortality complication with an incedence of 0,2%. This paper presents a case report on a patient presenting VSP in association with a possible rupture of the chordae tendineae of the tricuspide valve.

Características clínicas, modalidades de tratamiento y mortalidad en la ruptura del septum interventricular posinfarto / Clinical characteristics and treatment of ventricular septum rupture after acute myocardial infarction

Objetivo: Conocer las características, estrategia de tratamiento y mortalidad en pacientes con infarto agudo al miocardio y ruptura del septum interventricular posinfarto. Métodos: Se incluyeron 40 pacientes atendidos en un periodo de ocho años por infarto agudo al miocardio complicado con ruptura del septum interventricular posinfarto. Se utilizó ecocardiograma para confirmar la ruptura del septum interventricular posinfarto. Se evaluaron las características clínicas, el tipo de tratamiento y la mortalidad hospitalaria. Las variables se compararon con prueba U de Mann-Withney o prueba exacta de Fisher. Resultados: Edad 64 años (56 a 73), 67% hombres, 53% diabetes, 43% hipertensión, 40% tabaquismo. Los tratamientos fueron: conservador 45%, quirúrgico 38% o dispositivo Amplatzer 17%. La mortalidad general fue de 65%, con manejo conservador 54%, con cirugía 35% y con Amplatzer 12% (p = 0.02), y estuvo asociada a menor tiempo entre infarto agudo al miocardio y ruptura del septum interventricular posinfarto (p <0.001) y menor tiempo entre ruptura del septum interventricular posinfarto y tratamiento de cierre (p <0.001). Todos los pacientes con Killip Kimbal III o IV murieron. Conclusiones: Hasta el momento no existe una estrategia de manejo en la ruptura del septum interventricular posinfarto que demuestre ventajas sobre las demás. El único marcador de buen pronóstico podría ser el mayor tiempo entre la ruptura y el tratamiento de cierre. Es probable que la indicación de manejo de las guías internacionales no aplique para todos los pacientes y estos deban estratificarse de acuerdo a su estado hemodinámico.

Objective: To identify the characteristics, management strategy and mortality of patients with acute myocardial infarction (AMI) and rupture of ventricular septum (RVS). Methods: The study included 40 patients admitted during a period of 8 years, due to AMI complicated with RVS. RVS was confirmed by echocardiogram. The clinical characteristics, type of treatment and hospital mortality were evaluated. Variables were compared by Mann-Withney U tests or Fisher exact test. Results: Patients were 64 years old (56 - 73), 67% men, 53% diabetes mellitus, 43% hypertension, 40% smokers. Treatments were medical (45%), surgical (38%) or Amplatzer (17%). Overall mortality was 65%, in conservative group was 45%, in surgery group 38%, and Amplatzer group 17% (p = 0.02), it was associated to shorter time between AMI and RVS (p <0.001) and shorter time between and treatment (p <0.001). All patients with Killipp Kimbal III or IV died. Conclusions: Currently there is no management strategy in RSV with demonstrated advantage over other strategies. The only marker with good prognosis could be a long time between rupture and treatment. It is likely that the indication of management of International guidelines does not apply to all patients and these should be stratified according to their hemodynamic status.

Perfil clínico-cirúrgico de pacientes operados por ruptura do septo interventricular pós-infarto do miocárdio / Clinical and surgical profile of patients operated for postinfarction interventricular septal rupture

OBJETIVOS: Estudar características clínicas, complicações e desfechos intra-hospitalares de pacientes operados por ruptura do septo interventricular pós-infarto. MÉTODOS: Estudo retrospectivo envolvendo 21 pacientes entre janeiro/1996 e junho/2009. Todas as operações foram realizadas na Divisão de Cirurgia Cardiovascular do Complexo Hospitalar HUOC/PROCAPE. RESULTADOS: Idade média dos pacientes foi de 62,81 anos (± 8,21), sendo 61,9 por cento (n=13) do sexo masculino. Ruptura ocorreu, em média, 4,8 dias após o infarto. Foi observado choque cardiogênico em 57,1 por cento (n=12) dos casos, sendo este fator de risco para óbito (100 por cento com choque vs. 22,2 por cento sem choque; P<0,001). Sobreviventes apresentaram média de fração de ejeção maior em comparação aos óbitos (66,29 por cento ± 4,61 por cento versus 42,71 por cento ± 4,79 por cento; P<0,001). Todos pacientes foram classificados em alto risco pelo EuroSCORE, tendo os sobreviventes média de pontuação menor em comparação aos óbitos (6,57 ± 0,53 versus 10,93 ± 2,23; P<0,001). A maioria (76,2 por cento; n=16) dos pacientes teve necessidade de uso de drogas vasoativas e 57,1 por cento (n=12) foram considerados instáveis hemodinamicamente. Necessidade de drogas vasoativas foi fator de risco para óbito (81,3 por cento no grupo com drogas vasoativas versus 20 por cento no grupo sem drogas vasoativas, P=0,025). Instabilidade hemodinâmica também foi fator de risco para óbito (100 por cento no grupo instável versus 22,2 por cento no grupo estável; P<0,001). A taxa de mortalidade intra-hospitalar foi de 66,7 por cento (n=14). CONCLUSÕES: Necessidade de drogas vasoativas, instabilidade hemodinâmica e choque cardiogênico se associaram com maiores taxas de mortalidade. Pacientes que evoluem com desfecho adverso apresentam menor função ventricular e maior pontuação no EuroSCORE. A taxa de mortalidade permanece alta.

OBJECTIVES: To study clinical features, complications and in-hospital outcomes of patients operated for postinfarction ventricular septal rupture. METHODS: A retrospective study involving 21 patients between January/1996 and June/2009. All operations were performed at the Division of Cardiovascular Surgery of Complexo Hospitalar HUOC/PROCAPE. RESULTS: Mean age of patients was 62.81 years (± 8.21), 61.9 percent (n = 13) were male. Rupture occurred on average 4.8 days after infarction. Cardiogenic shock was observed in 57.1 percent (n = 12), being risk factor for death (100 percent with shock vs. 22.2 percent without shock; P<0.001). Survivors had a higher mean ejection fraction compared to deaths (66.29 percent ± 4.61 percent versus 42.71 percent ± 4.79 percent, P <0.001). All were classified as high risk by the EuroSCORE, and the survivors had lower average score compared to deaths (6.57 ± 0.53 versus 10.93 ± 2.23; P <0.001). The majority (76.2 percent, n = 16) of the patients needed to use vasoactive drugs and 57.1 percent (n = 12) considered hemodynamically unstable. Need for vasoactive drugs was a risk factor for death (81.3 percent with vasoactive drugs versus 20 percent without vasoactive drugs, P = 0.025). Hemodynamic instability was also a risk factor for death (100 percent in the unstable group versus 22.2 percent in the stable group; P <0.001). The rate of in-hospital mortality was 66.7 percent (n = 14). CONCLUSIONS: The need for vasoactive drugs, hemodynamic instability and cardiogenic shock were associated with higher rates of mortality. Patients who had adverse outcomes had less ventricular function and higher score in the EuroSCORE. Mortality remains high.

Infarto agudo al miocardio en pacientes de 80 y más años. Evolución hospitalaria y seguimiento / Clinical features and prognosis of acule myocardial infarction among patients aged 80 years or older

Background: Subjects older than 80 years have more complicated acute myocardial infarctions and are subjected to less reperfusion procedures. Aim: To describe the hospital evolution and follow up of patients older than 80 years, suffering an acute myocardial infarction. Material and methods: Patients older than 80 years, were selected from a prospective registry of acute myocardial infarction. Among these, the hospital evolution, mortality and events during a períod ofñve years of follow up, were recorded. Results: Of a total of 1200 patients, 83 (7 percent) were aged 80 years or older. Among these, 59 percent were male and 22 percent were diabetic. The mean lapse between onset of symptoms and admission was 11 hours and 59 percent were admitted with less than 6 hours of evolution. Sixty three percent had a history of a previous infarction and 24 percent had a Killip IV classification on admission. Reperfusion therapy was done in 19 percent and 70 percent had heart failure during evolution. A coronary angiography was done in 22 percent and 6 percent were subjected to revascularization. Mortality was 34 percent, specially due to cardiogenic shock or ventricular rupture. Of 55 patients discharged from the hospital, 31 percent died within one year and 64 percent within five years, mainly due to cardiac causes. Conclusions: Patients aged 80 years or older have more complicated myocardial infarctions, most of them are managed conservatively andlong term mortality is high.

Ruptura do septo interventricular após trauma torácico fechado / Ventricular septal rupture following blunt chest trauma

Relatamos a seguir um caso de ruptura do septo interventricular após trauma torácico automobilístico com evolução relativamente benigna a despeito da extensão da lesão anatômica.

We report a case of ventricular septal rupture following chest trauma resulting from a car accident. The outcome was relatively favorable despite the extension of the anatomic lesion.

Oclusión de ruptura septal interventricular en dos pacientes con infarto / Occlusion of interventricular septal rupture in two myocardic patients

Se describen dos casos de ruptura del séptum interventricula, secundaria a infarto miocárdico anteroseptal causado por la obstrucción total de la arteria coronaria descendente anterior. Con objeto de estabilizar hemodinámicamente a las pacientes, antes del cierre quirúrgico de la ruptura, se coluyó temporalmente el orificio septal por medio de un catéter con globo, introducido al ventrículo izquierdo desde la arteria femoral e inflado en el ventrículo derecho, frente a la ruptura, después de hacer pasar el globo por el defecto septal. Se observaron cambios hemodinámicos inmediatos a la oclusión de la ruptura: disminución en la relación entre el flujo sanguíneo pulmonar y el aórtico (6 por ciento en una paciente y 26 en la otra), reducción en el desvío arteriovenoso del flujo sanguíneo (8 y 31 por ciento) y elevación del flujo sanguíneo aórtico (10 por ciento) en una de las pacientes. Al disminuir el flujo pulmonar sin modificarse la presión arterial pulmonar, las resistencias arteriales pulmonares se elevaron inmediatamente después de la oclusión pero no se modificaron significativamente las presiones arteriales pulmonares y aórtica. Posteriormente las diferencias de O2 entre la arteria pulmonar y la aurícula derecha mostraron tendencias a mantenerse por debajo de los valores previos a la oclusión, favoreciendo la disminución del gasto y presión arteriales pulmonares. Una de las enfermas murió 14 días después del cierre quirúrgico de la ruptura septal; la otra murió antes de cirugía, siete días después de la colusión. Presentamos la evolución de las variables fisiológicas de las pacientes

Tratamento cirúrgico da comunicaçäo interventricular e rotura da parede livre do ventrículo esquerdo após infarto agudo do miocárdio e da disjunçäo atrioventricular após troca da valva mitral, empregando o dispositivo de isolamento ventricular (DIV): estudo experimental / Surgical treatment of postinfarction ventricular septal rupture, free wall rupture and rupture of the posterior wall of the left ventricle after mitral valve replacement, using ventricular isolation device (VID): experimental study

A rotura de parede livre do ventrículo esquerdo (VE) e a comunicaçäo interventricular (CIV) por rotura de septo säo dois eventos catastróficos que podem complicar a evoluçäo do infarto agudo do miocárdio (IAM). A oportunidade do tratamento cirúrgico, o acesso à CIV e a técnica cirúrgica ideal para o tratamento desta complicaçäo säo muito discutidos da literatura (1-5). Os resultados, porém, säo quase unânimes: alta taxa de mortalidade. A rotura da parede posterior do ventrículo esquerdo pós troca da valva mitral (disjunçäo atrioventricular) näo é uma complicaçäo rara, sendo quase sempre fatal (6,7). O objetivo de nosso trabalho é discutir a alternativa de tratamento cirúrgico destas graves lesöes, sem o manuseio direto do músculo cardíaco friável, necrozado. Desenvolvemos e testamos em animais (carneiros) o dispositivo de isolamento ventricular (DIV). No período de 12/7/95 a 10/1/96, operamos 12 carneiros adultos para o implante do DIV. No primeiro período de aprendizado da técnica de implante e de desenvolvimento da prótese, operamos 7 animais, sem sucesso, No segundo período operamos 5 animais, já com o DIV completamente desenvolvido e com a técnica cirúrgica já padronizada; obtivemos sucesso com todos os animais, sobrevivendo com bom débito cardíaco, constatado ao ecocardiograma e à ventriculografia. Após 20 dias de sobrevida, os animais foram submetidos a ventriculografia e ecocardiografia. Observamos o completo isolamento da cavidade ventricular com o emprego do DIV, obtendo o tratamento provisório destas graves lesöes.

Resultados quirúrgicos de la miomectomía septal ventricular

Este trabajo tiene por objetivo analizar los resultados a corto y mediano plazo de la miomectomía septal ventricular. Fueron revisados 6 pacientes sometidos a miotomía/miomectomía en un período comprendido entre noviembre de 1986 y diciembre de 1993 para estenosis subaórtica hipertrófica idiopática aislada o asociada a otras patologías. Se trata de 3 mujeres y 3 hombres con edades comprendidas entre 2 y 54 años (promedio 35). El diagnóstico se realizó con base en cuadro clínico, radiografía torácica, ecocardiografía bidimensional y cateterismo cardíaco. Cinco pacientes estaban en clase funcional III de la NYHA y 1 en clase II. El gradiente sistólico del tracto de salida del ventrículo izquierdo en el preoperatorio era de 66,8 mmHg en promedio. Los diagnósticos asociados fueron: estenosis valvular aórtica, insuficiencia mitral severa y bloqueo atrio-ventricular total. Las cirugías asociadas fueron valvuloplastia aórtica 1 caso (16.6 por ciento), prótesis aórtir cientoca 1 caso (16.6 por ciento), prótesis mitral 1 caso (16.6 por ciento), marcapaso epicárdico 1 caso .(16.6 por ciento). Hubo una complicación trasope (16ratoria: laceración de valvs aórticas. Las complic 1aciones postoperatorias incluyeron: infección respiratoria 2 (33.3 por ciento), fibrilación atrial aguda 1 (16.6 por ciento), accidente vascular cerebral 1 (16.6 por ciento), y mediastinitis 1 (16.6 por ciento). La mortalidad postoperatoria fue de 1 caso como uconsecuencia de sepsis y falla multiorgánica. El seguimiento fue de 2 a 53 meses (promedio 23.6) y demostró una mejoría en la clase funcional: clase I (NYHA) 4 casos 66.6 por ciento y clase II 1 caso (16.6 por ciento). El gradiente postoperatorio mejoró en todos los pacientes (promedio 17 mmHg). La miomectomía septal ventricular es un procedimiento que presenta bajo riesgo quirúrgico; la mayoría de los pacientes mostró un resultado favorable a mediano plazo