Document Detail

Serotonin and heart rate in hypertensive and normotensive subjects.
MedLine Citation:
PMID:  9588414     Owner:  NLM     Status:  MEDLINE    
Plasma and platelet levels of 5-hydroxytryptamine (5 HT) may be altered in essential hypertension. To establish the determinants and correlates of 5 HT in plasma and platelets, we studied 53 untreated subjects with essential hypertension (26 men; 30 whites; mean supine blood pressure 172/101 mm Hg; mean age 49.3 +/- 1.5 years) and 61 normotensive subjects (37 men; 47 whites; mean supine blood pressure 128/78 mm Hg; mean age 42.8 +/- 1.6 years). Plasma and platelet 5 HT were assayed by reverse-phase high performance liquid chromatography with electrochemical detection. No significant difference was found in platelet-poor plasma or platelet 5 HT levels in hypertensive or normotensive subjects (plasma: 43.0 +/- 4.2 and 39.6 +/- 4.4 nmol/L; platelet: 1.65 +/- 1.22 and 1.70 +/- 1.39 nmol/10(9) cells in hypertensive and normotensive subjects, respectively). No significant correlation was found between plasma or platelet 5 HT and systolic or diastolic blood pressure (plasma: r = 0.01 and 0.01 in normotensive subjects and r = 0.01 and -0.14 in hypertensive subjects; platelet: r = 0.12 and 0.13 in normotensive subjects and r = 0.02 and -0.09 in hypertensive subjects). However, plasma 5 HT was associated with supine and standing pulse rates (supine: r = 0.27, p = 0.05 in normotensive subjects and r = 0.54, p < 0.001 in hypertensive subjects; standing: r = 0.19 and r = 0.46, p < 0.001, respectively). Significant relations were also found between platelet 5 HT levels and supine and standing heart rate in the subjects mentioned above (supine: r = 0.28, p = 0.05 in normotensive subjects and r = 0.64, p < 0.001 in hypertensive subjects; standing: r = 0.24 and r = 0.51, p < 0.001, respectively). These associations were stronger in the hypertensive group as a whole, and they held when adjustment was made for differences in age and total blood cholesterol. The present study showed that plasma and platelet 5 HT are not significantly altered in hypertensive subjects. However, plasma and platelet 5 HT levels showed a significant association with supine and standing pulse rate predominantly in hypertensive subjects. This is consistent with experimental evidence of a positive chronotropic effect of 5 HT on perfused hearts and it suggests a possible role of plasma serotonin in the regulation of heart rate.
C G Missouris; F P Cappuccio; E Varsamis; J L Barron; E Carr; N D Markandu; G A MacGregor
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  135     ISSN:  0002-8703     ISO Abbreviation:  Am. Heart J.     Publication Date:  1998 May 
Date Detail:
Created Date:  1998-05-19     Completed Date:  1998-05-19     Revised Date:  2006-02-27    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  838-43     Citation Subset:  AIM; IM    
Department of Medicine, St. George's Hospital Medical School, London, UK.
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MeSH Terms
Blood Platelets / metabolism*
Blood Pressure / physiology
Cholesterol / blood
Heart Rate / physiology*
Hypertension / physiopathology*
Middle Aged
Reference Values
Serotonin / blood*
Reg. No./Substance:
50-67-9/Serotonin; 57-88-5/Cholesterol

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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