Hipertensión nocturna

Is it Mandatory to do a 24 hour ABPM in all Patients with Moderate to Severe Obstructive Sleep Apnoea?

Background  Obstructive sleep apnoea (OSA) has been described as a risk factor for arterial hypertension (HT). One of the proposed mechanisms linking these conditions is non dipping (ND) pattern in nocturnal blood pressure, however evidence is variable and based on specific populations with underlying conditions. Data for OSA and ND in subjects residing at high altitude are currently unavailable. Objective  Identify the prevalence and association of moderate to severe OSA with HT and ND pattern in hypertensive and non-hypertensive otherwise healthy middle-aged individuals in residing at high altitude (Bogotá:2640 mt) Methods  Adult individuals with diagnosis of moderate to severe OSA underwent 24 hour- ambulatory blood pressure monitoring (ABPM) between 2015 and 2017. Univariable and multivariable logistic regression analysis were performed to identify predictors of HT and ND pattern. Results  Ninety-three (93) individuals (male 62.4% and median age 55) were included in the final analysis. Overall, 30.1% showed a ND pattern in ABPM and 14.9% had diurnal and nocturnal hypertension. Severe OSA (higher apnea-hiponea index [AHI]) was associated with HT (p = 0.006), but not with ND patterns (p = 0.54) in multivariable regression. Smoking status and lowest oxygen saturation during respiratory events where independently associated with ND pattern (p = 0.04), whereas age (p = 0.001) was associated with HT. Conclusions  In our sample, one in three individuals with moderate to severe OSA have non dipping patterns suggesting lack of straight association between OSA and ND. Older individuals who have higher AHI are more likely to have HT, and those who smoke have a higher risk of ND. These findings add aditional information to the multiple mechanisms involved in the relationship between OSA and ND pattern, and questions the routine use of 24-hour ABPM, particullary in our region, with limited resources and healthcare acces. However, further work with more robust methodology is needed to draw conclusions.

El ritmo circadiano de la presión arterial y su relación con los factores de riesgo cardiovascular

Introducción: Numerosos estudios han establecido tanto la hipertensión arterial como la hipertensión de bata blanca como factores de riesgo cardiovascular. Un ritmo circadiano anómalo de la presión arterial podría aumentar el riesgo cardiovascular. Objetivo: Determinar la existencia de una relación clínicamente relevante entre un ritmo circadiano anómalo de la presión arterial y un incremento del riesgo cardiovascular en pacientes con hipertensión arterial o hipertensión de bata blanca. Material y Método: Estudio descriptivo en 166 pacientes mayores de 18 años del Área Básica de Salud de Balaguer que tuvieran una monitorización ambulatoria de la presión arterial realizada entre junio de 2014 y marzo de 2018 y cumplieran los criterios de inclusión y exclusión. Se realizó un análisis univariado y bivariado de las variables. Resultados: Se obtuvo que en casi todos los promedios de presión arterial nocturna destaca el patrón riser mostrando que el 25% tenía un riesgo cardiovascular mayor o igual al 10%, seguido del dipper extremo 16,67%, dipper 9,4% y no dipper 8,27%. Conclusión: Un ritmo circadiano alterado se relaciona con un riesgo cardiovascular más elevado y un peor control de los factores que conllevan al mismo.

[Descriptive study of ambulatory blood pressure monitoring in the Primary Care Nursing clinic]

OBJECTIVE

To analyze the clinical characteristics and the circadian patterns of patients who received ambulatory blood pressure monitoring (ABPM) by a Primary Care Team.

METHOD

A descriptive, observational, cross-sectional study at community level. People older than 18 years on ABPM (2007-2011).

VARIABLES

demographic, cardiovascular disease, diabetes mellitus, cardiovascular risk factors, any type of arterial hypertension and circadian pattern. Intruments of measurement: 2 validated instruments with comparable results were used.

PROCEDURE

The instruments for ABPM were placed during the nursing visit. The instruments were then removed after 24h, and the data was retrieved and recorded in the computerized clinical history.

RESULTS

A total of 326 people were studied, with a mean age of 60.53±12.96 years, of whom 56.7% were male. According to ABPM the patient results showed that: 38.5% had «white coat» arterial hypertension, 36.2% were classified as poorly controlled arterial hypertension, 17.2% had masked hypertension, and 8% with isolated hypertension. Dipper circadian patterns were present in 39.6% of patients and non- dipper in 60.4%.

CONCLUSIONS

ABPM allows to Primary Health Care professionals to check the actual situation of the blood pressure over 24h and analyze the circadian pattern. In clinical practice this involves having a comprehensive care strategy on life style, as well as adherence to treatment.