geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Correlations between the coefficient of variation of RR intervals and sympathetic nerve activity following superior tilting in normotensive subjects and in patients with essential hypertension


, : Correlations between the coefficient of variation of RR intervals and sympathetic nerve activity following superior tilting in normotensive subjects and in patients with essential hypertension. Journal of Cardiology 21(4): 923-929

The relationship between changes in sympathetic nerve activity and those in parasympathetic tone with a change in position was investigated in patients with essential hypertension using the coefficient of variation of RR intervals on electrocardiograms (CVRR). Mean arterial pressure (MAP), heart rate (HR), plasma noradrenaline concentration (pNA) and CVRR were measured in a supine position at rest and 20 min after having the head tilted 60 degrees superiorly in 10 normotensives (NT: 51.9 +/- 3.0 yrs) and 7 essential hypertensive patients (EHT: 51.0 +/- 2.8 yrs). After changing the position, CVRR decreased significantly in the NT, but not in the EHT; whereas, significant increases of both HR and pNA without significant changes in MAP were shown in both groups. A significant negative correlation between percentage changes in CVRR (% delta CVRR) and pNA (% delta pNA) were observed in the NT, but not in the EHT. However, there was no relationship of % delta CVRR to % delta MAP or to % delta HR in either group. It was suggested from the changes in CVRR that suppression of the parasympathetic tone, which occurs in the NT group corresponding to sympathetic augmentation to present a decrease in blood pressure with a change in position, may be impaired in the EHT group.

US$29.90

PMID: 1844448


Other references

S Jaireth; M Sharma, 1986: Physico-chemical conditions of ore deposition in Malanjkhand copper sulphide deposit. Heating and freezing studies on fluid inclusions in quartz from mineralized quartzfeldspar reef reveal the presence of type A CO2-H2O (H2O>50% by volume), type B CO2-H2O (H2O<50% by volume), type C pure CO2 and type D pure aqueous inclusions...

Tang, W.; Tseng, H., 1999: A GC-rich sequence within the 5' untranslated region of human basonuclin mRNA inhibits its translation. By the method of RNase protection, the 5' ends of the basonuclin mRNA were mapped to four sites distributed over 400 bases of the genomic sequence, a result implying four different basonuclin transcripts within the cell. Despite the heterogen...

Q.Y.Z.ou; G.S.L.u, 2012: The embryology of Xanthoceras and its phylogenetic implications. Recent molecular analyses found the Chinese monotypic genus <i>Xanthoceras</i> to be either a sister genus to the rest of a broadly defined Sapindaceae sensu lato (s.l.) including Aceraceae and Hippocastanaceae or the only genus of the...

Peitz, U.; Aygen, S.; Hennemann, O.; Tillenburg, B.; Boersch, G.; Stolte, M.; Labenz, J., 1996: Reduction of endoscopic workload by screening young dyspeptic patients with a highly accurate 13C-urea breath test. Gastroenterology 110(4 SUPPL ): A227

Anonymous, 1990: Patient care technicians ease shortage and free nurses for other duties. Hospital Patient Relations Report 5(4): 5-5

Sivori, L., 1950: Luigi Sivori. Archivio di Tisiologia E Delle Malattie Dell'apparato Respiratorio 5(8): Varia, 317-8

Dirr, Ma, 1981: Fragrant wintersweet adds to southern gardens Chimonanthus praecox, Georgia. American nurseryman, 154(8): 9

Zhang, L.; Li, L.; Leavesley, H.W.; Zhang, X.; Borowitz, J.L.; Isom, G.E., 2010: Cyanide-induced apoptosis of dopaminergic cells is promoted by BNIP3 and Bax modulation of endoplasmic reticulum-mitochondrial Ca2+ levels. Cyanide is a potent neurotoxicant that can produce dopaminergic neuronal death in the substantia nigra and is associated with a Parkinson-like syndrome. In this study involvement of Bcl-2/adenovirus E1B 19-kDa interacting protein 3 (BNIP3), a BH3-...

Keighley D.; Collins S.; Flint S.; Howell John A., 1999: Reservoir-scale distribution of fluvial sandbodies in lacustrine closed basins, and some sequence-stratigraphic implications; Green River Formation, SW Uinta Basin, east-central Utah. Measured lithologic sections and outcrop Gamma Ray data from the Green River Formation, middle member, have been correlated over a approximately 35 km (super 2) area of Nine Mile Canyon, Utah, and into the subsurface using well data. In a approxim...

Rotter, V.; Abutbul, H.; Ben-Ze'ev, A., 1983: P53 transformation-related protein accumulates in the nucleus of transformed fibroblasts in association with the chromatin and is found in the cytoplasm of non-transformed fibroblasts. The subcellular localization of the p53 molecule was studied in transformed and non-transformed fibroblasts. A newly established transformed cell line obtained by treating primary embryonic mouse cells in vitro with the chemical carcinogen methylc...