Latin-American guidelines of recommendations at discharge from an acute coronary syndrome.

The diagnostic criteria, treatments at the time of admission, and drugs used in patients with acute coronary syndrome are well defined in countless guidelines. However, there is uncertainty about the measures to recommend during patient discharge planning. This document brings together the most recent evidence and the standardized and optimal treatment for patients at the time of discharge from hospitalization for an acute coronary syndrome, for comprehensive and safe care in the patient's transition between care from the acute event to the outpatient care, with the aim of optimizing the recovery of viable myocardium, guaranteeing the most appropriate secondary prevention, reducing the risk of a new coronary event and mortality, as well as the adequate reintegration of patients into daily life.

Los criterios diagnósticos, los tratamientos en el momento de la admisión y los fármacos utilizados en pacientes con síndrome coronario agudo están bien definidos en innumerables guías. Sin embargo, existe incertidumbre acerca de las medidas para recomendar durante la planificación del egreso de los pacientes. Este documento reúne las evidencias más recientes y el tratamiento estandarizado y óptimo para los pacientes al momento del egreso de una hospitalización por un síndrome coronario agudo, para un cuidado integral y seguro en la transición del paciente entre la atención del evento agudo y el cuidado ambulatorio, con el objetivo de optimizar la recuperación de miocardio viable, garantizar la prevención secundaria más adecuada, reducir el riesgo de un nuevo evento coronario y la mortalidad, así como la adecuada reinserción de los pacientes en la vida cotidiana.

Blood pressure telemonitoring and telemedicine, a Latin America perspective.

PURPOSE: To share a Latin-American perspective of the use of telemedicine, together with blood pressure measurements outside the medical office, as a potential contribution to improving access to the health system, diagnosis, adherence, and persistence in hypertension treatment. MATERIAL AND METHODS: A document settled by a Writing Group of Mexico Hypertension Experts Group, Interamerican Society of Hypertension, Epidemiology and Cardiovascular Prevention Council of the Interamerican Society of Cardiology, and National Cardiologist Association of Mexico. RESULTS: In almost all Latin American countries, the health sector faces two fundamental challenges: (1) ensure equitable access to quality care services in a growing population that faces an increase in the prevalence of chronic diseases, and (2) optimise the growing costs of health services, maintaining equity, accessibility, universality, and quality. Telehealth proposes an innovative approach to patient management, especially for chronic conditions, intending to provide remote consultation, education, and follow-up to achieve measurements and goals. It is a tool that promises to improve access, empower the patient, and somehow influence their behaviour about lifestyle changes, improving prevention and reducing complications of hypertension. The clinical practitioner has seen increased evidence that the use of out-of-office blood pressure (BP) measurement and telemedicine are helpful tools to keep patients and physicians in contact and promote better pharmacological adherence and BP control. A survey carried out by medical and scientific institutions showed that practitioners are up-to-date with telemedicine, had internet access, and had hardware availability. CONCLUSIONS: A transcendent issue is the need to make the population aware of the benefits of taking blood pressure to avoid complications of hypertension, and in this scenario, promote the creation of teleconsultation mechanisms for the follow-up of patients diagnosed with hypertension.

What is the context?In almost all Latin American countries, the health sector faces two fundamental challenges: (1) ensure equitable access to quality care services in a growing population that faces an increase in the prevalence of chronic diseases, and (2) optimise the growing costs of health services, maintaining equity, accessibility, universality, and quality.What is new?Telehealth proposes an innovative approach to patient management, especially for chronic conditions, intending to provide remote consultation, education, and follow-up to achieve measurements and goals. It is a tool that promises to improve access, empower the patient, and somehow influence their behaviour about lifestyle changes, improving prevention and reducing complications of hypertension.What is the impact?Needs are always infinite, and resources are finite, so according to the World Health Organisation (WHO), advances in electronic, information, and communication technology point to more significant equity in the provision of services, considering the effectiveness, possibility of refining the rationalisation of health spending, and improving health care for remote populations.A transcendent issue is the need to make the population aware of the benefits of taking blood pressure to avoid complications of hypertension, and in this scenario, promote the creation of teleconsultation mechanisms for the follow-up of patients diagnosed with hypertension.

Blood pressure telemonitoring and telemedicine for hypertension management-positions, expectations and feasibility of Latin-American practitioners. SURVEY carried out by several cardiology and hypertension societies of the Americas.

PURPOSE: To assess the opinion of Latin-American physicians on remote blood pressure monitoring and telehealth for hypertension management. MATERIAL AND METHODS: Cross-sectional survey of physicians residing in Latin-America. The study was conducted by the Mexico Hypertension Experts Group, Interamerican Society of Hypertension, Interamerican Society of Cardiology Epidemiology and Cardiovascular Prevention Council, and National Cardiologist Association of Mexico. An online survey composed of 40 questions using Google Forms was distributed from 7 December 2021, to 3 February 2022. The survey was approved by the GREHTA Ethics Committee and participation was voluntary and anonymous. Multiple logistic regression models were constructed to identify the challenges of telehealth. RESULTS: 1753 physicians' responses were gathered. The responses came from physicians from different Latin-American countries, as follows: 24% from Mexico, 20.6% from Argentina, 14.7% from Colombia, 10.9% from Brazil, 8.7% from Venezuela, 8.2% from Guatemala and 3.2% from Paraguay. Responders with a high interest in carrying out their assistance task through remote telemonitoring reached 48.9% (821), while 43.6% are already currently conducting telemonitoring. A high number, 62%, claimed to need telemonitoring training. There is a direct relation between higher interest in telemonitoring and age, medical specialty, team working, residence in the biggest cities, expectations regarding telemedicine and reimbursement. CONCLUSIONS: Remote monitoring is feasible in Latin-America. General practitioners and specialists from bigger cities seem eager and are self-perceived as well-trained and experienced. Facilities and resources do not seem to be a challenge but training reinforcement and telemedicine promotion is necessary for those physicians less motivated.PLAIN LANGUAGE SUMMARYWhat is the context?Hypertension is one of the leading worldwide modifiable risk factors for premature death. Strong evidence supports that effective treatment of this condition results in a significant reduction of hard outcomes.Only 20%-30% of hypertensive patients are within the blood pressure targets recommended by guidelines in Latin-America. There is an urgent need to implement innovative strategies to reverse this alarming health situation.What is new?Latin-American physicians were highly predisposed to telemonitoring practice. This high motivation was not influenced by hardware or software availability, technological knowledge or experience, by volume of monthly consultations, or by area (private-public) where the care activity is carried out.This high motivation may be supported by the conviction that this practice could be very useful as a complement to face-to-face assistance and a highly effective tool to improve adherence even though respondents considered that just 10% of the patients would prefer telemonitoring over office consultation.What is the impact?Facilities and resources do not seem to be a challenge but training reinforcement and telemedicine promotion is necessary for those physicians less motivated. The general perception is that it is necessary to move forward to resolve legal gaps and financial aspects.Physicians must adapt to changes and develop new communication strategies in a world where the unrestricted access to teleinformation makes patients self-perceived as experts.

Latin American Consensus on management of residual cardiometabolic risk. A consensus paper prepared by the Latin American Academy for the Study of Lipids and Cardiometabolic Risk (ALALIP) endorsed by the Inter-American Society of Cardiology (IASC), the International Atherosclerosis Society (IAS), and the Pan-American College of Endothelium (PACE).

BACKGROUND: Hypertension, hyperglycemia, dyslipidemia, overweight, obesity, and tobacco (smoking, chewing, and vaping), together with a pro-inflammatory and procoagulant state, are the main risk factors related to atherosclerotic cardiovascular disease. OBJECTIVE AND METHODS: A group of experts from the Americas, based on their clinical expertise in cardiology, cardiovascular prevention, and cardiometabolic (CM) diseases, joined together to develop these practical recommendations for the optimal evaluation and treatment of residual CM risk factors in Latin America, using a modified Delphi methodology (details in electronic TSI) to generate a comprehensive CM risk reduction guideline, and through personalized medicine and patient-centered decision, considering the cost-benefit ratio The process was well defined to avoid conflicts of interest that could bias the discussion and recommendations. RESULTS: Residual risk reduction should consider therapeutic options adapted to specific patient needs, based on five treatment objectives: triglyceride-rich lipoproteins, inflammation, impaired glucose metabolism, high blood pressure, and prothrombotic status. Comprehensive control of all CM risk factors should be a priority to deal with this important public health problem and prevent premature deaths. The recommendations in this paper address the evidence-based treatment of CM risk and are intended for clinical application in Latin American countries.

Antecedentes: Un grupo de factores de riesgo cardiometabólicos (hipertensión, hiperglucemia, dislipidemia, sobrepeso, obesidad y tabaco (fumado, masticado, vaporizado), junto con un estado proinflamatorio y procoagulante, son los principales factores de riesgo relacionados con la enfermedad cardiovascular aterosclerótica. Objetivo y métodos: Basándose en su experiencia en cardiología, prevención cardiovascular y enfermedades cardiometabólicas, un grupo de expertos de las Américas se unió para desarrollar estas recomendaciones prácticas para la evaluación y tratamiento óptimos de los factores de riesgo cardiometabólicos residuales en América Latina, utilizando una metodología Delphi modificada con el objetivo de generar una guía integral de pautas para la reducción del riesgo cardiometabólico, mediante la medicina personalizada y la decisión centrada en el paciente teniendo en cuenta la relación costo-beneficio. El proceso fue bien definido para evitar conflictos de intereses que podrían sesgar la discusión y las recomendaciones. Resultados: La reducción del riesgo residual debe considerar opciones terapéuticas adaptadas a las necesidades específicas del paciente, basadas en 5 objetivos de tratamiento: lipoproteínas ricas en triglicéridos inflamación, metabolismo de la glucosa, presión arterial alta y estado protrombótico. El Control integral de todos los factores de riesgo cardiometabólicos debe ser una prioridad para hacer frente a este importante problema de salud pública y prevenir las muertes prematuras. Las recomendaciones de este documento abordan el tratamiento basado en evidencia del riesgo cardiometabólico y están destinadas a la aplicación clínica en los países de América Latina.

Considerations and Guidance for the Structure, Organisation, and Operation of Cardiometabolic Prevention Units: A Consensus Statement of the Inter-American Society of Cardiology.

Cardiovascular diseases (CVDs) remain the leading cause of death worldwide, particularly in low- and middle-income regions such as Latin America. This is because of the combination and interaction in different proportions of a high prevalence of cardiometabolic risk factors and socio-economic and cultural characteristics. This reality brings about the need to change paradigms to consistently and systematically boost cardiovascular prevention as the most cost-effective medium- to long-term strategy to reduce their prevalence in medium- and low-resource countries, not only in Latin America but also in other global regions. To achieve the therapeutic goals in various diseases, including CVD, the current literature demonstrates that the most effective way is to carry out the patient's diagnosis and treatment in multidisciplinary units. For this reason, the Inter American Society of Cardiology (IASC) proposes the creation of cardiometabolic prevention units (CMPUs) as a regional initiative exportable throughout the world to standardise cardiovascular prevention based on the best available evidence. This ensures homogeneity in the global management of cardiometabolic risk factors and access to quality medicine independently of the population's social situation. These guidelines, written by a panel of experts in cardiovascular prevention, defines what a CMPU is, its objectives and the minimum requirements for it, as well as proposing three categories and suggesting an operational scheme. It must be used as a guide for all individuals or centres that, aware of the need for multidisciplinary and standardised work, want to create a unit for the comprehensive management of cardiometabolic risk established as an international research network. Lastly, the document makes meaningful points on the determination of cardiovascular risk and its importance. These guidelines do not cover specific targets and therapeutic schemes, as these topics will be extensively discussed in another SIAC publication, namely a statement on residual cardiometabolic risk.

Collaboration between the National Association of Cardiologists of Mexico, the Mexican Society of Cardiology, and the University of Guanajuato. COVID-19 and Cardiac Imaging Personnel: Review of Sanitary Practices in Early 2021 / Colaboración de la Asociación Nacional de Cardiólogos de México y de la Sociedad Mexicana de Cardiología con la Universidad de Guanajuato. COVID-19 y personal de imagen cardiaca: Revisión de prácticas sanitarias al inicio de 2021

The authors of the image chapters of the National Association of Cardiologists of Mexico (ANCAM) and the Mexican Society of Cardiology (SMC), as well as personnel from the Department of Medicine and Nutrition of the University of Guanajuato, together with prominent experts in cardiovascular imaging from Mexico, have collaborated in the review, analysis and expansion of the various health strategies published in the first year of the coronavirus disease 2019 (COVID-19) pandemic, to safely perform cardiac imaging studies. This update aims to reduce the risk of COVID-19 transmission among patients and health-care personnel in the CT, MRI, and nuclear cardiology services. This work was expanded with supplementary information available free of charge on the website www.ancam-imagen.com.

Los capítulos de imagen de la Asociación Nacional de Cardiólogos de México (ANCAM) y de la Sociedad Mexicana de Cardiología (SMC), así como personal del Departamento de Medicina y Nutrición de la Universidad de Guanajuato, en conjunto con destacados expertos de la imagen cardiovascular en México, han colaborado en la revisión, análisis y ampliación de las diversas estrategias sanitarias publicadas en los primeros 15 meses de la pandemia de enfermedad por coronavirus 2019 (COVID-19) para realizar con seguridad los estudios de imagen cardiaca; esta actualización tiene como objetivo principal disminuir el riesgo de transmisión de la COVID-19 entre los pacientes y el personal de salud en los servicios de tomografía, resonancia y cardiología nuclear. Este trabajo se amplió con información suplementaria disponible sin costo en el sitio www.ancam-imagen.com.

Psychological Impact of the Pandemic on Ambulatory Cardiometabolic Patients Without Evidence of SARS-CoV-2 Infection. The CorCOVID Latam Psy Study.

BACKGROUND: The COVID-19 pandemic's mental health consequences remain unknown. AIM: To assess the mental health status of ambulatory cardiometabolic patients during COVID-19 pandemic lockdown in Spanish speaking Latin American countries. METHODS: Cardiometabolic patients without COVID-19 evidence in 13 Latin American countries answered a survey between June 15th and July 15th, 2020. The Diagnosis Manual of Mental Disorders fifth edition was used to identify the presence of major depressive symptoms. RESULTS: The sample included 4216 patients, 1590 (37.71%; IC95% 36.24-39.19) were considered suffering major depression. Female gender, consuming ≥5 medications day, physical activity <100 minutes weekly, low fruits and vegetables intake, poor treatment adherence, reduced food consumption were independently associated to the presence of major depressive symptoms. CONCLUSIONS: The CorCOVID Latam Psy study showed that one-third of the Latin American Spanish speaking population is suffering from major depressive symptoms during the COVID-19 outbreak.

Impact of the Pandemic on NonInfected Cardiometabolic Patients: A Survey in Countries of Latin America-Rationale and Design of the CorCOVID LATAM Study.

BACKGROUND: The first case of coronavirus 2019 (COVID-19) in Latin America was detected on February 26th, 2020, in Brazil. Later, in June, the World Health Organization announced that the focus of the outbreak had shifted to Latin America, where countries already had poor control of indicators of noncommunicable diseases (NCDs). Concerns about coronavirus infection led to a reduced number of visits and hospitalizations in patients with NCDs, such as cardiovascular disease, diabetes, and cancer. There is a need to determine the impact of the COVID-19 pandemic on patients who have cardiometabolic diseases but do not have clinical evidence of COVID-19 infection. METHODS: The CorCOVID LATAM is a cross-sectional survey of ambulatory cardiometabolic patients with no history or evidence of COVID-19 infection. The study will be conducted by the Interamerican Society of Cardiology. An online survey composed of 38 questions using Google Forms will be distributed to patients of 13 Latin American Spanish-speaking countries from June 15th to July 15th, 2020. Data will be analyzed by country and regions. Seven clusters of questions will be analyzed: demographics, socioeconomic and educational level, cardiometabolic profile, lifestyle and habits, body-weight perception, medical follow-up and treatments, and psychological symptoms. RESULTS: Final results will be available upon completion of the study. CONCLUSIONS: The present study will provide answers regarding the impact of the COVID-19 pandemic on noninfected cardiometabolic patients. Data on this topic are scarce, as it is an unprecedented threat, without short-term solutions.

CONTEXTE: Le premier cas de maladie à coronavirus 2019 (COVID-19) en Amérique latine a été détecté le 26 février 2020 au Brésil. En juin, l'Organisation mondiale de la Santé a annoncé que le foyer de l'épidémie s'était déplacé en Amérique latine, où le suivi des indicateurs relatifs aux maladies non transmissibles est déjà déficient. Les préoccupations relatives à l'infection par le coronavirus ont entraîné une diminution du nombre de consultations et d'hospitalisations des patients atteints d'une maladie non transmissible, comme une ma-ladie cardiovasculaire, le diabète ou un cancer. Il est donc nécessaire d'évaluer l'incidence de la pandémie de COVID-19 chez les patients atteints d'une maladie cardiométabolique ne présentant aucun signe clinique d'une infection au virus de la COVID-19. MÉTHODOLOGIE: L'étude CorCOVID LATAM est une enquête transversale menée auprès des patients ambulatoires atteints d'une maladie cardiométabolique n'ayant pas d'antécédents d'infection au virus de la COVID-19 et ne présentant aucun signe d'une telle infection. L'étude est réalisée par la Société interaméricaine de cardiologie. Du 15 juin au 15 juillet 2020, on a demandé aux patients de 13 pays hispanophones d'Amérique latine de répondre à un questionnaire en ligne de 38 questions dans Google Forms. Les données seront analysées par pays et par région. Les réponses aux questions seront examinées selon sept grands thèmes : caractéristiques démographiques, caractéristiques socioéconomiques et niveau de scolarité, profil cardiométabolique, mode de vie et habitudes, perception quant au poids corporel, suivi et traitements médicaux et symptômes psychologiques. RÉSULTATS: Les résultats seront publiés à la fin de l'étude. CONCLUSIONS: L'étude fournira des renseignements sur l'incidence de la pandémie de COVID-19 chez les patients atteints d'une maladie cardiométabolique non infectés. Les données sur cette question sont rares, puisqu'il s'agit d'une menace sans précédent, à laquelle il n'existe de surcroît pas de solution à court terme.

The attempt to demolish the science and practice of preventive cardiovascular medicine. Part I. Addendum to the positioning around the diagnosis and treatment of dyslipidemias of ANCAM and the joint group of associated medical societies / El intento de demoler la ciencia y la práctica de la medicina cardiovascular preventiva. Parte I. Addendum al posicionamiento en torno al diagnóstico y tratamiento de las dislipidemias de la ANCAM y del grupo conjunto de sociedades médicas asociadas

Abstract: This manuscript is an addendum to the positioning around the diagnosis and treatment of dyslipidemias of ANCAM and the joint group of associated medical societies, already published. It is the first part of a wider reflection aimed on refute several of the theses and arguments of a group of clinicians and researchers who question the validity of the "cholesterol hypothesis", the usefulness and safety of statins and the most modern inhibitors of proprotein convertase of subtilisin/kexin type 9 (iPCSK9,) and the role of saturated fatty acids consumed in the usual diet in the atherosclerotic risk. This iconoclastic point of view is dangerous insofar as it undermines the scaffolding that supports the primary and secondary prevention of atherosclerosis. In this section of the manuscript, only the cholesterol hypothesis is discussed. The data of comparative zoology are reviewed, and several experimental animal models are analyzed, both supporting the link between cholesterol and the appearance and evolution of atherosclerotic lesions. The methodology and the results of the Study of the 7 Countries are defended and are exposed the numerous epidemiological, pathological, clinical and interventional evidences, which in our opinion give a solid sustenance to the cholesterol hypothesis. Based on this knowledge it is criticized the LDL cholesterol values currently considered adequate. Furthermore, the so-called residual risk is considered, as well as the conflicting evidence about the usefulness of statins in elderly patients.

Resumen: Este manuscrito es un apéndice del posicionamiento en torno al diagnóstico y tratamiento de las dislipidemias de la ANCAM y el grupo de las sociedades médicas asociadas, previamente publicado. Es la primera parte de un trabajo más amplio enfocado a refutar varias de las tesis y argumentos de un grupo de clínicos e investigadores que ponen en duda la validez de la "hipótesis del colesterol", la utilidad y seguridad de las estatinas y los más modernos inhibidores de la proproteína convertasa de la subtilisina/kexina tipo 9 (iPCSK9) y el papel de los ácidos grasos saturados consumidos en la dieta habitual en el riesgo ateroscleroso. Este punto de vista iconoclástico es peligroso porque socava el andamiaje que soporta la prevención primaria y secundaria de la aterosclerosis. En esta primera sección del manuscrito, se discute sólo la hipótesis del colesterol. Se revisan los datos de zoología comparada y se analizan varios modelos animales de experimentación, que apoyan la liga entre el colesterol y la aparición y evolución de las lesiones aterosclerosa. Se defienden la metodología y los resultados del estudio de los 7 países y se exponen las numerosas evidencias epidemiológicas, patológicas, clínicas e intervencionistas, que a nuestro juicio dan un sustento sólido a la hipótesis del colesterol. Se critican también, en base a ese conocimiento, los valores de colesterol LDL actualmente considerados adecuados, a la vez que se discute el llamado riesgo residual y las evidencias conflictivas acerca de la utilidad de las estatinas en pacientes ancianos.

Strategic evaluation of silent myocardial ischemia in a group of patients with rheumatoid arthritis and traditional cardiovascular risk factors / Evaluación estratégica de la isquemia miocárdica silenciosa en un grupo de pacientes con artritis reumatoide y factores de riesgo cardiovascular tradicionales

Abstract: Introduction: IHD has become an important long-term end point for RA patients independent of traditional CVRF. Therefore, cardiovascular injury and mortality might be due to the presence of a chronic systematic inflammatory response. Nonetheless, there is a gap in its diagnosis since symptoms remain silent until major events occur. Objective: We aimed to evaluate by gated single-photon emission computed tomography (g-SPECT). Myocardial perfusion in asymptomatic Mexican patients with RA and at least one traditional CVRF, and without history of angina. Patients and methods: A prospective study with a total number of 91 patients was conducted. We evaluated CVRF and RA characteristics. We non-invasively assessed them with g-SPECT to reveal ischemia, territories and severity. We calculated relative risks and 95% CI of ischemia given the associated variables. Results: 22 (24.2%) patients presented ischemia, half of them in the LAD territory. Regarding CVRF and disease's characteristics; only smokers and patients under a steroid treatment were at more risk to present ischemia (0.49 [0.24 to 0.98] and 2.04 [1.01 to 4.14], respectively) with a p = 0.046. Conclusion: We have contributed with additional evidence to strategically diagnose IHD in patients with RA even if they have no symptoms and independently of the existence of cardiovascular risk factors to prevent and reduce cardiovascular mortality.

Resumen: Introducción: La IC se ha convertido en un importante punto de partida a largo plazo para los pacientes con AR independientemente de los FRCV tradicionales. Por lo tanto, las lesiones cardiovasculares y la mortalidad podrían deberse a la presencia de una respuesta inflamatoria sistemática crónica. Sin embargo, hay una brecha en su diagnóstico ya que los síntomas permanecen en silencio hasta que ocurren eventos importantes. Objetivo: Evaluar mediante tomografía computarizada de emisión de un solo fotón (g-SPECT). Perfusión miocárdica en pacientes mexicanos asintomáticos con AR y al menos un FRCV tradicional, sin antecedentes de angina. Pacientes y métodos: Se realizó un estudio prospectivo con un número total de 91 pacientes. Se evaluaron las características FRCV y AR. Los evaluamos de forma no invasiva con g-SPECT para revelar isquemia, territorios y severidad. Se calcularon los riesgos relativos la isquemia de 95% dadas las variables asociadas. Resultados: Veintidós (24.2%) pacientes presentaron isquemia, la mitad de ellos en territorio LAD. Respecto a los FRCV y características de la enfermedad; sólo los fumadores y los pacientes sometidos a un tratamiento con esteroides presentaron mayor riesgo de presentar isquemia (0.49 [0.24 a 0.98] y 2.04 [1.01 a 4.14], respectivamente) con p = 0.046. Conclusión: Hemos aportado pruebas adicionales para diagnosticar la isquemia estratégicamente en los pacientes con AR, incluso si no tienen síntomas y con independencia de la existencia de factores de riesgo cardiovascular para prevenir y reducir la mortalidad cardiovascular.

Myocardial perfusion scintigraphy (spect) in the evaluation of patients in the emergency roo with precordial pain and normal or doubtful ischemic ECG. Study 60 cases

Objetivos: Evaluar la utilidad diagnóstica de la centelleografia de perfusión miocárdica con SPECT y Gated-SPECT (GSPECT), en el diagnóstico del síndrome coronario agudo (SCA) en pacientes con dolor precordial y ECG normal o dudoso, dentro de las 6 horas del último episodio de dolor precordial. Métodos: Sesenta pacientes con estas características fueron incluidos. Se realizó en todos los pacientes estudio de perfusión miocárdica con SPECTy Gated SPECT empleando 2 protocolos distintos. Todos los pacientes fueron sometidos a prueba de estrés farmacológico. En 30 casos se realizó angiografía coronaria. Resultados: La perfusión miocárdica en reposo fue anormal o positiva en 25 pacientes (42 por ciento) y normal o negativa en 35 pacientes (58 por ciento). En estos últimos la perfusión se tornó anormal en 15 pacientes (43 por ciento) bajo la prueba de estrés con dipiridamol, y en 19 (54º/0) la perfusión permaneció normal. Este subgrupo se mantuvo libre de eventos coronarios 12 meses posteriores al alta hospitalaria. En el grupo de 25 pts con perfusión positiva en reposo se diagnosticó infarto agudo del miocardio en 7 pacientes, isquemia en 12 y reversibilidad-inversa en 6. La centelleografia de perfusión miocárdica mostró en la fase de reposo una sensibilidad del 61 por ciento (IC 95 por ciento, 39-74 por ciento) y VPN del 71 por ciento (IC 95 por ciento, 58-82 por ciento). En la fase de estrés, la utilidad de la prueba se incrementa en forma significativa alcanzando una sensibilidad del 97 por ciento (IC 95 por ciento,83-99 por ciento), una especificidad del 79 por ciento (IC 95 por ciento, 57-92 por ciento) y lo más sobresaliente, un VPN del 95 por ciento (IC 95 por ciento, 73 por ciento-99 por ciento). Conclusiones El estudio de perfusión miocárdica tiene una sensibilidad del 97 por ciento para identificar a los pacientes con SCA, dolor precordial y ECG de reposo normal o dudoso. En los pacientes con síndrome coronario agudo con riesgo intermedio o bajo en estas técnicas no invasivas de perfusión miocárdica, se obtiene un alto grado de precisión diagnóstica y seguridad, se reducen los internamientos innecesarios así como los costos