Key result
Parkinson disease is linked to higher ambulatory blood pressure variability, including a ~33% increase in systolic SDdn.
Why the study?
Classical indices of ambulatory blood pressure variability have limited validity in individuals with circadian blood pressure alterations such as those with Parkinson disease.
Case-Control (n=42)
Absolute Event Rate: 10.9% vs 8.2%
p-value: p=<0.05
Summary Patients with Parkinson disease (PD) present blunted nocturnal blood pressure fall and similar ambulatory blood pressure variability (ABPV) measured by standard deviation (SD) and coefficient of variation (CV) compared with healthy subjects. However, these classical indices of ABPV have limited validity in individuals with circadian blood pressure alterations. New indices, such as the average of daytime and night‐time standard deviation weighted by the duration of the daytime and night‐time intervals (SDdn) and the average real variability (ARV), remove the influence of the daytime and the night‐time periods on ABPV. This study assessed ABPV by SDdn and ARV in PD. Twenty‐one patients with PD (11 men, 66 ± 2 years, stages 2–3 of modified Hoehn & Yahr) and 21 matched controls without Parkinson disease (9 men, 64 ± 1 years old) underwent blood pressure monitoring for 24 h. ABPV was analysed by 24 h, daytime and night‐time SD and CV, and by the SDdn and ARV. Systolic/diastolic 24‐h and night‐time SD and CV were similar between the patients with PD and the controls. The patients with PD presented higher daytime systolic/diastolic CV and SD than the controls (10·4 ± 0·9/12·3 ± 0·8 versus 7·0 ± 0·3/9·9 ± 0·5%, P<0·05; 12·6 ± 1·0/9·1 ± 0·5 versus 8·6 ± 0·4/7·5 ± 0·3 mmHg, P<0·05, respectively) as well as higher systolic/diastolic SDdn (10·9 ± 0·8/8·2 ± 0·5 versus 8·2 ± 0·3/7·1 ± 0·2 mmHg, P<0·05, respectively) and ARV (8·8 ± 0·6/6·9 ± 0·3 versus 7·2 ± 0·2/6·0 ± 0·2 mmHg, P<0·05, respectively). In conclusion, patients with PD have higher ABPV than control subjects as assessed by SDd, CVd, SDdn and AVR.
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Kanegusuku et al. (2016) conducted a case-control in Parkinson disease (n=42). Parkinson disease vs. Matched controls without Parkinson disease was evaluated on Systolic standard deviation weighted by the duration of daytime and night-time intervals (SDdn) (p=<0.05). Parkinson disease was associated with higher ambulatory blood pressure variability compared to controls, including higher systolic SDdn (10.9 vs 8.2 mmHg, P<0.05) and ARV (8.8 vs 7.2 mmHg, P<0.05).
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