Combinación farmacológica en el tratamiento del infarto agudo del miocardio con elevación del segmento ST: análisis de la literatura y experiencia en la Unidad Coronaria del Instituto Nacional de Cardiología Dr Ignacio Chávez / Pharmacologic combination in the treatment of the acute myocardial infarction with ST elevation

The evolution of reperfusion treatment has permitted an improvement in the prognosis and survival of patients with Acute myocardial infarction with ST elevation. The benefit of thrombolitic therapy was demonstrated clearly starting with the first trials of ISIS 2. It was also demonstrated this benefit is greater when the thrombolitic is combined with aspirin. Other trials have arisen like GUSTO I and TIMI 14, which have continued with the search for the best strategy of reperfusion, demonstrating that the pharmacologic combination with fibrinolitic, antiplatelet and antithrombinics provides the best results regarding permeability of the epicardic artery and transmiocardic reperfusion. Finally the mechanical reperfusion has managed to improve the results obtained with the pharmacologic treatment. Nevertheless it is probably that the Angioplasty with fibrinolitic and antiplatelet therapy is a useful treatment strategy, available for the patient with acute coronary syndrome with ST elevation. In light of the latest studies we must be very cautious, but based on the knowledge of the physiopathology of these syndromes, we think there is still much to discover.

Estratificación clínica del enfermo con estado de choque cardiogénico, el valor agregado del poder cardíaco y del índice de las resistencias periféricas / Clinical stratification of cardiogenic shock

Cardiogenic shock (CHC) associated to acute myocardial infarct has high mortality and their manifestations are heterogenous. In our institution historical mortality, was 98%, but with different methods of reperfusion, its reduced to 53%. In other hand, with opportune clinical stratification is useful to improve the treatment strategy. This stratification on basis in clinical signs: age, infarction location, cardiac frequency and systemic arterial pressure, and hemodynamical valuation with the use of right catheterism with quantification miocardial work parameters like [quot ]Cardiac power[quot ] that is the product of flow and arterial pressure and that is of utility to know the [quot ]Miocardial reserve[quot ]. In our experience after reperfusion procedure patients with CHC and cardiac power less than 1.0 had highly mortality.

El poder cardíaco un instrumento del pasado, posiblemente una herramienta moderna en la valoración: clínica, terapéutica y pronóstica del choque cardiogénico por síndrome isquémico coronario agudo / The cardiac power output an old tool, possibly a modern tool for assessing cardiac pumping capability, as well as for a short-term prognosis in cardiogenic shock due to acute myocardial infarction

Hemodynamic monitoring has been used extensively during the last decades for risk stratification and guiding treatment of patients with cardiovascular destabilization, especially in the scenario of acute heart failure and cardiac shock. Every cardiac pump has its own maximum performance, which denotes its pumping capability. The heart is a muscular mechanical pump with an ability to generate both flow (cardiac output) and pressure. The product of flow output and systemic arterial pressure is the rate of useful work done, [quot ]or the cardiac power[quot ] (CP). Cardiac pumping capability can be defined as the cardiac power output achieved by the heart during maximal stimulation, and cardiac reserve is the increase in power output as the cardiac performance is increased from the resting to the maximally stimulated state (CPR). Resting CP for a hemodynamically stable average sized adult is approximately 1 W. However, during stress or exercise, CPR can be recruited to increase the heart's pumping ability up to 6 W. In acute heart failure, the patient becomes hemodynamically unstable, and most of the cardiac pumping potential is recruited in order to sustain life. Hence, cardiac power measurements in patients with acute heart failure or with cardiogenic shock at rest represent most of the recruitable reserve available during the acute event, and their measurement reflects the severity of the patient's condition. It has been found that a cutoff value for CP of 0.53 W accurately predict in-hospital mortality for cardiogenic shock patients. Others investigators observed cutoff for increased mortality of CP < 1 W, data that were obtained at doses of maximal pharmacologic support yielding the individual maximal CP. In our experience, the cutoff value for CP that accurately predicts in-hospital mortality for cardiogenic shock patients is 0.7 W, but its impact on short-term prognosis is clearer if the patient achieves a CP equal or higher than 1 W after an optimal myocardial revascularization with interventional cardiac procedures. According to the data collected from the literature, CP deserves a place in the evaluation of the patient with cardiogenic shock due to an acute myocardial infarction, but a more profound analysis of this parameter an further evaluation are required in order to better understand its prognostic meaning in this acute cardiac syndrome.