[Stroke volume and cardiac output equivalents under orthostatic load in young and elderly volunteers (author's transl)].
With advancing age, orthostatic disturbances of regulation become clinically more relevant. They are observed in about 25% of persons older than 65 years, independent of their initial blood pressure. The stroke volume equivalents obtained by means of impedance cardiography enable the physician to differentiate between the behaviour during the early regulation phase and that during the phase of late regulation. The following conclusions can be drawn from the findings in 38 young volunteers (average age: 22 years) and 39 elderly volunteers (average age: 76 years): In elderly volunteers with normal late regulation, the stroke volume drops immediately by 16.1 ml and attains a maximum drop by 19.5 ml after ten minutes. Elderly volunteers with pathologic late regulation show a distinctly higher decrease in stroke volume by 38 to 42 ml below the initial level. With younger volunteers with normal late regulation, the stroke volume drops after positional change by 43 ml and attains an average minimum value of 55 ml after ten minutes. With the younger volunteers with pathologic late regulation, there is an average drop by 52.7 to max. 72.7 ml below the initial level. Assessment of the immediate regulation shows 2 different types of behaviour of orthostatic immediate regulation.
D000328:Adult; D000367:Age Factors; D000368:Aged; D002302:Cardiac Output; D006801:Humans; D008875:Middle Aged; D011187:Posture; D013318:Stroke Volume
Schlag- und Minutenvolumenäquivalent unter orthostatischer Belastung bei jüngeren und älteren Probanden.