title: Disturbed circadian blood pressure rhythm and C-reactive protein in essential hypertension.
abstract: We investigated the effect of the diverse definition criteria of the dipping and non-dipping status on the assessed differences in inflammatory activation between dippers and non-dippers with essential hypertension. 269 consecutive subjects (188 males, aged 50+/-7 years) with untreated stage I-II essential hypertension underwent ambulatory blood pressure (BP) monitoring and high-sensitivity C-reactive protein (hs-CRP) level determination. The population was classified into dippers and non-dippers based on the three following different definitions: true non-dippers (TND): non-dippers (nocturnal fall of systolic and diastolic BP of <10% of the daytime values, n=95) and dippers (the remaining subjects, n=174); true dippers and true non-dippers (TD-TND): non-dippers (nocturnal fall of systolic and diastolic BP<10%, n=95) and dippers (nocturnal fall of systolic and diastolic BP> or =10%, n=75); systolic non-dippers (SND): non-dippers (nocturnal systolic BP fall of <10% of the daytime values, n=145) and dippers (the remaining subjects, n=124). Non-dippers compared to dippers in the TND, TD-TND and SND classification exhibited higher levels of log hs-CRP (by 0.11 mg l(-1), P=0.02; 0.13 mg l(-1), P=0.03 and 0.14 mg l(-1), P=0.02, respectively) and 24 h pulse pressure (PP) (by 4 mm Hg, P=0.006; by 5 mm Hg, P=0.003 and by 5 mm Hg, P<0.0001, respectively). Twenty-four hour PP and nocturnal systolic BP fall were independent predictors of log hs-CRP (P<0.05 for both) in multiple regression analysis. In conclusion, essential hypertensive non-dippers compared to dippers exhibit higher hs-CRP values, irrespective of the dipping status definition. Furthermore, ambulatory PP and nocturnal systolic BP fall interrelate and participate in the inflammatory processes that accompany non-dipping state.
authors.affiliation: First Cardiology Clinic, University of Athens, Hippokration Hospital, Athens, Greece. ktsioufis@hippocratio.gr
authors.forename: C
authors.initials: C
authors.lastname: Tsioufis
authors.forename: D
authors.initials: D
authors.lastname: Syrseloudis
authors.forename: K
authors.initials: K
authors.lastname: Dimitriadis
authors.forename: C
authors.initials: C
authors.lastname: Thomopoulos
authors.forename: D
authors.initials: D
authors.lastname: Tsiachris
authors.forename: P
authors.initials: P
authors.lastname: Pavlidis
authors.forename: M
authors.initials: M
authors.lastname: Selima
authors.forename: I
authors.initials: I
authors.lastname: Kallikazaros
authors.forename: C
authors.initials: C
authors.lastname: Stefanadis
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D001794:Blood Pressure / Q000502:physiology*; D018660:Blood Pressure Monitoring, Ambulatory; D002097:C-Reactive Protein / Q000378:metabolism*; D002940:Circadian Rhythm / Q000502:physiology*; D005260:Female; D006801:Humans; D006973:Hypertension / Q000097:blood* / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged
chemical_list: D015415:Biomarkers; D002097:C-Reactive Protein