Comportamiento de los parámetros hemodinámicos evaluados por el monitoreo ambulatorio de presión arterial de 24 horas

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Abstract

Resumen Objetivo: Describir el comportamiento de los parámetros hemodinámicos en un grupo de individuos sometidos al estudio de monitoreo ambulatorio de la presión arterial. Materiales y métodos: Estudio observacional descriptivo sobre el comportamiento de los parámetros hemodinámicos en el estudio de monitoreo ambulatorio de la presión arterial en un grupo de pacientes atendidos en dos instituciones de Medellín. Resultados: Se analizaron un total de 108 pacientes atendidos en el período comprendido entre septiembre de 2012 y octubre de 2013. Los promedios de la presión arterial sistólica y presión arterial diastólica en 24 horas fueron de 128.34 ± 12.79 mmHg y 75.87 ± 8.74 mm Hg, respectivamente. La media de la presión del pulso fue de 52.47 ± 11.12 mmHg. Las presiones arteriales medias diurna y nocturna fueron de 96,23 ± 9,5 mmHg y 85.19 ± 10,23 mmHg, respectivamente. La frecuencia cardiaca fue de 71.4 ± 10.03 latidos por minuto, para la carga sistólica la media fue de 39,38 ± 27,80% y para la carga diastólica fue de 26,26 ± 24,32%. Conclusiones: El monitoreo ambulatorio de la presión arterial es considerado actualmente como el método más confiable y exacto para el diagnóstico y evaluación de la hipertensión arterial. Permite no solo el diagnóstico y seguimiento del comportamiento de las cifras tensionales en los hipertensos, sino la evaluación de otras variables, como es mostrado en este estudio, con un comportamiento de los resultados muy similar a otros estudios locales.

Translated abstract

Abstract Objetive: To describe the behavior of hemodynamic parameters in a group of individuals undergoing ambulatory blood pressure monitoring. Material and methods: Descriptive, observational study on the behavior of hemodynamic parameters in ambulatory blood pressure monitoring of a group of patients assisted in two institutions in Medellín. Results: A total of 108 patients were analysed, assisted between September 2012 and October 2013. Average 24-hour systolic and diastolic blood pressure values were 128.34 ± 12.79 mmHg and 75.87 ± 8,74 mmHg, respectively. Average pulse pressure was 52.47 ± 11.12 mmHg. Day and night blood pressure values were 96.23 ± 9.5 mmHg and 85.19 ± 10.23 mmHg, respectively. Heart rate was 71.4 ± 10.03 beats per minute, it was 39.38 ± 27.80% for the systolic load and 26.26 ± 24.32% for the diastolic load. Conclusions : Ambulatory monitoring of blood pressure is considered nowadays to be the most reliable and exact method for diagnosing and assessing arterial hypertension. Not only does it allow diagnosis and control of the behavior of blood pressure levels in hypertensive patients, but also assesses other variables, like the ones shown in this study, with results being similar to those of other local studies.

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Ambulatory blood pressure monitoring in hypertensive patients with high cardiovascular risk: a cross-sectional analysis of a 20,000-patient database in Spain.

Manuel Gorostidi, Alex La Reau, J. Galceran … (2007)

To evaluate ambulatory blood pressure monitoring (ABPM) parameters in a broad sample of high-risk hypertensive patients. The Spanish Society of Hypertension is developing a nationwide project in which more than 900 physicians send ABPM registries and corresponding clinical records to a central database via www.cardiorisc.com. Between June 2004 and July 2005 a 20 000-patient database was obtained; 17 219 were valid for analysis. We identified 6534 patients with high cardiovascular risk according to the 2003 European Society of Hypertension/European Society of Cardiology guidelines stratification score. Office blood pressure (BP) was 158.8/89.9 mmHg and 24-h BP was 135.8/77.0 mmHg. Patients with grade 3 BP in the office showed ambulatory systolic BP values less than 160 mmHg in more than 80%. A non-dipping pattern was observed in 3836 cases (58.7%), whereas this abnormality was present in 47.9% of patients with low-to-moderate risk [odds ratio (OR) 1.54; 95% confidence interval (CI) 1.45-1.64]. The prevalence of non-dippers was higher as ambulatory BP increased ( approximately 70% when 24-h systolic BP > 155 mmHg) and was similar in both groups. At the lowest levels of BP (24-h systolic BP < 135 mmHg) a non-dipping pattern was more prevalent in high-risk cases (56.6 versus 45.7%; OR 1.51; 95% CI 1.40-1.64). There was a remarkable discrepancy between office and ambulatory BP in high-risk hypertensive patients. The prevalence of a non-dipper BP pattern was almost 60%. In the lowest levels of ambulatory BP, high-risk patients showed a higher prevalence of non-dipping BP than lower-risk cases. These observations support the recommendation of a wider use of ABPM in high-risk hypertensive patients.

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Antihypertensive therapy: nocturnal dippers and nondippers. Do we treat them differently?

Nitika Pant Pai, Chakrapani Mahabala, Padmanabha Kamath … (2013)

Hypertension is a major independent risk factor for cardiovascular diseases. Management of hypertension is generally based on office blood pressure since it is easy to determine. Since casual blood pressure readings in the office are influenced by various factors, they do not represent basal blood pressure. Dipping of the blood pressure in the night is a normal physiological change that can be blunted by cardiovascular risk factors and the severity of hypertension. Nondipping pattern is associated with disease severity, left ventricular hypertrophy, increased proteinuria, secondary forms of hypertension, increased insulin resistance, and increased fibrinogen level. Long-term observational studies have documented increased cardiovascular events in patients with nondipping patterns. Nocturnal dipping can be improved by administering the antihypertensive medications in the night. Long-term clinical trials have shown that cardiovascular events can be reduced by achieving better dipping patterns by administering medications during the night. Identifying the dipping pattern is useful for decisions to investigate for secondary causes, initiating treatment, necessity of chronotherapy, withdrawal or reduction of unnecessary medications, and monitoring after treatment initiation. Use of this concept at the primary care level has been limited because 24-hour ambulatory blood pressure monitoring has been the only method for documenting dipping/nondipping status so far. This monitoring technique is expensive and inconvenient for routine usage. Simpler methods using home blood pressure monitoring systems are evolving to document basal blood pressure in the night, which would help in greater acceptance and use of the concept of dipper/nondipper in managing hypertension at the primary care level.

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Ambulatory arterial stiffness index is not a specific marker of reduced arterial compliance.

Massimo Mannarino, Gianfranco Parati, Laura Sperandini … (2007)

Ambulatory arterial stiffness index (AASI), a measure based on the relative behavior of 24-hour systolic and diastolic blood pressure (BP), has been suggested as a marker of arterial stiffness and a predictor of cardiovascular mortality. However, a narrow range of diastolic BP values over the 24 hours tends to flatten the regression slope and to artificially increase AASI. We explored the possible influence of different ranges of 24-hour diastolic BP fluctuations, such as those related to nocturnal BP fall, on AASI, and on its relationship with target organ damage. In 515 untreated hypertensive patients, AASI was directly related to age (r=0.30) and 24-hour systolic BP (r=0.20), whereas it was inversely related with nocturnal systolic and diastolic BP reduction (r=-0.28 and -0.46, respectively; all P<0.001). A direct relationship was found between AASI and left ventricular mass index (r=0.17; P<0.001), but this relation was no longer significant after adjustment for age, sex, body mass index, daytime systolic BP, and day-night systolic BP reduction (all P<0.05). AASI was directly related to carotid-femoral pulse wave velocity, an intrinsic measure of aortic stiffness (r=0.28; P<0.001), but no independent relation was found in a multiple linear regression. Our conclusions are as follows: (1) AASI is strongly dependent on the degree of nocturnal BP fall in hypertensive patients; (2) there is no significant relation between AASI and left ventricular mass after proper adjustment for confounders; and (3) the relation between AASI and a widely accepted measure of aortic stiffness, such as pulse wave velocity, is weak and importantly affected by other factors.