Linked Life Data

1570725

Source:http://linkedlifedata.com/resource/pubmed/id/1570725

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1992-5-26
pubmed:abstractText
In order to study the influence of body position on cardiodynamics and the consequences for the regulation of rate-adaptive pacing, we examined variations of cardiocirculatory parameters with passive graded tilt from the erect to the supine position (90 degrees, 75 degrees, 60 degrees, 45 degrees, 30 degrees, 0 degrees) in 25 healthy subjects of both sexes under resting conditions and under conditions of exercise on a bicycle ergometer. Using impedance cardiography combined with phonocardiography, it was possible to record heart rate, cardiac output, contractility (Heather index), and left-ventricular ejection time (LVET). Under the condition of rest, some parameters showed evident tilt dependency: tilting from erect to supine induced a decrease of heart rate (85.1 to 65.7 bpm), an increase of stroke volume (84.4 to 111.4 ml), and a prolongation of LVET (255.8 to 330.3 ms). Cardiac output and the index of contractility were not changed by this manipulation, however. Tilting under the condition of exercise clearly had less influence on all cardiodynamic parameters than tilting under the condition of rest. The only significant increase of heart rate (89.4 to 109.2 bpm), cardiac output (10.4 to 13.1 l/min), and Heather index (24.2 to 29.8 ohm/s2) was found between 30 degrees or 15 degrees, respectively, and the supine position. Thus, in addition to indicators of physical activity, body position respective stroke volume should be taken into consideration. Consequently, rate-adaptive pacing may guarantee optimal physiological hemodynamics.
pubmed:language
ger
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0300-5860
pubmed:author
pubmed:issnType
Print
pubmed:volume
81
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
25-9
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
[Effect of body posture on heart rate and cardiocirculatory parameters in stress--implications for frequency-adapted pacemaker systems].
pubmed:affiliation
I. Medizinische Klinik, Technischen Universität München.
pubmed:publicationType
Journal Article, English Abstract