Abstract:
INTRODUCTION:The hysto-morfological composition of the ascending aorta wall gives to the vessel its characteristic elasticity/distensibility, which is deteriorated due to both physiological (age) and pathological events (hypertension, diabetes, dyslipidemia). This contributes to reduce the wall elasticity and to occurrence of cardiovascular events. MATERIALS AND METHODS:Thirty young healthy subjects (20 males, 10 females, age <30 yr), were subjected to different postural conditions with and without Lower Body Negative Pressure (LBNP) with conventional procedures, to simulate the microgravity conditions in space flight. During this procedure the cardiovascular parameters and the aorta elasticity were assessed with ecocardiography. RESULTS:The observation of results and statistical comparison showed that despite different hemodynamic conditions and with significant variation of blood pressure related to posture, elasticity/distensibility did not change significantly. DISCUSSION:The elasticity/distensibility of arterial vessels is the result of two interdependent variables such as blood pressure and systolic and diastolic diameters. While blood pressure and heart rate vary physiologically in relation to posture, the compensation of the vessel diameters modifications maintains the aortic compliance invariate. Therefore, in young healthy people, despite the significant postural and the sudden pressure changes (equivalent to parietal stress) aortic compliance does not alter. This behavior might be related to the low rate of cardiovascular events that are present in healthy people aged under 30 yrs.
journal_name
Eur Rev Med Pharmacol Scijournal_title
European review for medical and pharmacological sciencesauthors
Alessandri N,Tufano F,Petrassi M,Alessandri C,Lanzi L,Fusco L,Moscariello F,De Angelis C,Tomao Esubject
Has Abstractpub_date
2010-05-01 00:00:00pages
421-6issue
5eissn
1128-3602issn
2284-0729journal_volume
14pub_type
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