Stroke Volume During Orthostatic Challenge: Comparison of Two Non-Invasive Methods

Abstract

Background: Real time non-invasive determination of stroke volume (SV) is important to astronaut orthostatic testing. We compared simultaneous estimates of SV calculated from peripheral pulse waveforms with a more conventional non-invasive technique. Methods: Ten men and nine women completed 12-min protocols. The relative change (%delta) in beat-to-beat SV was estimated non-invasively from changes in pulse waveforms measured by application of infrared finger photoplethysmography (IFP) and thoracic impedance cardiography (TIC). The %delta SV values were calculated from continuous measurements in the supine posture and over the first 10 s (T1), second 10 s (T2), and 3 min (T3) of 80 degrees head-up tilt (HUT).

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 2005
Accession Number
ADA628180

Entities

People

  • Donald F. Doerr
  • Duane A. Ratliff
  • Joseph Sithole
  • Victor A Convertino

Organizations

  • United States Army Institute of Surgical Research

Tags

Communities of Interest

  • Biomedical

DTIC Thesaurus Topics

  • Biological Sciences
  • Biomedical Engineering
  • Blood Flow
  • Cardiography
  • Cardiovascular System
  • Combat Casualty Care
  • Computer Programming
  • Data Acquisition
  • Health Services
  • Heart
  • Impedance
  • Measurement
  • Standards
  • Statistical Analysis
  • Steady State
  • Vascular Diseases
  • Vital Signs

Fields of Study

  • Medicine

Readers

  • Cardiovascular Physiology
  • Medical Imaging.

Technology Areas

  • Space