Caroline A Rickards

Summary

Publications

  1. ncbi request reprint The effect of low-level normobaric hypoxia on orthostatic responses
    Caroline A Rickards
    Aerospace Physiology Laboratory, School of Medical Sciences, Faculty of Life Sciences, RMIT University, Victoria, Australia
    Aviat Space Environ Med 73:460-5. 2002
  2. ncbi request reprint Inspiratory resistance delays the reporting of symptoms with central hypovolemia: association with cerebral blood flow
    Caroline A Rickards
    U S Army Institute of Surgical Research, 3400 Rawley E Chambers Ave, Fort Sam Houston, TX 78234 6315, USA
    Am J Physiol Regul Integr Comp Physiol 293:R243-50. 2007
  3. ncbi request reprint Inspiratory resistance, cerebral blood flow velocity, and symptoms of acute hypotension
    Caroline A Rickards
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    Aviat Space Environ Med 79:557-64. 2008
  4. doi request reprint Breathing through an inspiratory threshold device improves stroke volume during central hypovolemia in humans
    Kathy L Ryan
    U S Army Institute of Surgical Research, 3400 Rawley E Chambers Avenue, Fort Sam Houston, TX 78234 6315, USA
    J Appl Physiol (1985) 104:1402-9. 2008
  5. doi request reprint Tracking central hypovolemia with ecg in humans: cautions for the use of heart period variability in patient monitoring
    Kathy L Ryan
    US Army Institute of Surgical Research, Fort Sam Houston, Texas, USA
    Shock 33:583-9. 2010
  6. ncbi request reprint Squat-stand test response following 10 consecutive episodes of head-up tilt
    Narelle M Berry
    Aerospace Physiology Laboratory, RMIT University, Bundoora, Victoria, Australia
    Aviat Space Environ Med 77:1125-30. 2006
  7. doi request reprint Optimizing the respiratory pump: harnessing inspiratory resistance to treat systemic hypotension
    Victor A Convertino
    United States Army Institute of Surgical Research, Fort Sam Houston, Texas 78234 6315, USA
    Respir Care 56:846-57. 2011
  8. ncbi request reprint Combat stress or hemorrhage? Evidence for a decision-assist algorithm for remote triage
    Caroline A Rickards
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    Aviat Space Environ Med 79:670-6. 2008
  9. doi request reprint Progressive reduction in central blood volume is not detected by sublingual capnography
    Kevin K Chung
    U S Army Institute of Surgical Research, Fort Sam Houston, Texas 78234, USA
    Shock 37:586-91. 2012
  10. pmc Arterial pressure oscillations are not associated with muscle sympathetic nerve activity in individuals exposed to central hypovolaemia
    Kathy L Ryan
    US Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    J Physiol 589:5311-22. 2011

Detail Information

Publications29

  1. ncbi request reprint The effect of low-level normobaric hypoxia on orthostatic responses
    Caroline A Rickards
    Aerospace Physiology Laboratory, School of Medical Sciences, Faculty of Life Sciences, RMIT University, Victoria, Australia
    Aviat Space Environ Med 73:460-5. 2002
    ..Altitude-induced hypoxia is believed to decrease tolerance to orthostasis. This preliminary investigation assesses the interaction between low-level normobaric hypoxia and the cardiovascular responses to orthostasis...
  2. ncbi request reprint Inspiratory resistance delays the reporting of symptoms with central hypovolemia: association with cerebral blood flow
    Caroline A Rickards
    U S Army Institute of Surgical Research, 3400 Rawley E Chambers Ave, Fort Sam Houston, TX 78234 6315, USA
    Am J Physiol Regul Integr Comp Physiol 293:R243-50. 2007
    ....
  3. ncbi request reprint Inspiratory resistance, cerebral blood flow velocity, and symptoms of acute hypotension
    Caroline A Rickards
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    Aviat Space Environ Med 79:557-64. 2008
    ....
  4. doi request reprint Breathing through an inspiratory threshold device improves stroke volume during central hypovolemia in humans
    Kathy L Ryan
    U S Army Institute of Surgical Research, 3400 Rawley E Chambers Avenue, Fort Sam Houston, TX 78234 6315, USA
    J Appl Physiol (1985) 104:1402-9. 2008
    ....
  5. doi request reprint Tracking central hypovolemia with ecg in humans: cautions for the use of heart period variability in patient monitoring
    Kathy L Ryan
    US Army Institute of Surgical Research, Fort Sam Houston, Texas, USA
    Shock 33:583-9. 2010
    ..HPV metrics, therefore, may not be useful in monitoring hemorrhagic injuries in individual patients...
  6. ncbi request reprint Squat-stand test response following 10 consecutive episodes of head-up tilt
    Narelle M Berry
    Aerospace Physiology Laboratory, RMIT University, Bundoora, Victoria, Australia
    Aviat Space Environ Med 77:1125-30. 2006
    ..This study aimed to investigate if the cardiovascular adaptation observed following 10 +75 degrees head-up tilts (HUT) would improve the responses to the squat-stand test (SST)...
  7. doi request reprint Optimizing the respiratory pump: harnessing inspiratory resistance to treat systemic hypotension
    Victor A Convertino
    United States Army Institute of Surgical Research, Fort Sam Houston, Texas 78234 6315, USA
    Respir Care 56:846-57. 2011
    ....
  8. ncbi request reprint Combat stress or hemorrhage? Evidence for a decision-assist algorithm for remote triage
    Caroline A Rickards
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    Aviat Space Environ Med 79:670-6. 2008
    ..The RRI HF and PP were used because of their ability to track central hypovolemia...
  9. doi request reprint Progressive reduction in central blood volume is not detected by sublingual capnography
    Kevin K Chung
    U S Army Institute of Surgical Research, Fort Sam Houston, Texas 78234, USA
    Shock 37:586-91. 2012
    ..1 ± 1.0 vs. 48.6 ± 1.5 mm Hg, P = 0.624). In a model of progressive central hypovolemia in humans, we did not detect metabolic derangements in the sublingual mucosa as measured by SLCO2...
  10. pmc Arterial pressure oscillations are not associated with muscle sympathetic nerve activity in individuals exposed to central hypovolaemia
    Kathy L Ryan
    US Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    J Physiol 589:5311-22. 2011
    ..These results do not support the use of low frequency oscillations in arterial pressure as a non-invasive measure of sympathetic outflow for individual subjects during sympathetic activation...
  11. ncbi request reprint Inspiratory resistance maintains arterial pressure during central hypovolemia: implications for treatment of patients with severe hemorrhage
    Victor A Convertino
    U S Army Institute of Surgical Research, Fort Sam Houston, TX, USA
    Crit Care Med 35:1145-52. 2007
    ....
  12. ncbi request reprint Hyperventilation in response to progressive reduction in central blood volume to near syncope
    Victor A Convertino
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234 6315, USA
    Aviat Space Environ Med 80:1012-7. 2009
    ..We, therefore, tested the hypothesis that hyperventilation can be elicited by progressive reductions in central blood volume independent of metabolic stimuli...
  13. doi request reprint Use of advanced machine-learning techniques for noninvasive monitoring of hemorrhage
    Victor A Convertino
    US Army Institute of Surgical Research, Tactical Combat Casualty Care Research Program, Fort Sam Houston, Texas 78234, USA
    J Trauma 71:S25-32. 2011
    ....
  14. doi request reprint Physiological and medical monitoring for en route care of combat casualties
    Victor A Convertino
    US Army Institute of Surgical Research, Fort Sam Houston, TX 78234 6315, USA
    J Trauma 64:S342-53. 2008
    ....
  15. doi request reprint Limitations of end-tidal CO2 as an early indicator of central hypovolemia in humans
    John G McManus
    U S Army Institute of Surgical Research, Fort Sam Houston, Texas 78234 6315, USA
    Prehosp Emerg Care 12:199-205. 2008
    ..This study tested the hypothesis that pulmonary end-tidal CO(2) (PETCO(2)) tracks reductions in central blood volume in human volunteers exposed to progressive central hypovolemia...
  16. ncbi request reprint Acute cardiovascular adaptation to 10 consecutive episodes of head-up tilt
    Narelle M Berry
    Aerospace Physiology Laboratory, RMIT University, School of Medical Sciences, P O Box 71, Bundoora, Victoria 3083, Australia
    Aviat Space Environ Med 77:494-9. 2006
    ..Little is known as to whether the cardiovascular system can adapt to acute, repetitive +Gz exposures. This study tested the hypothesis that the cardiovascular system would adapt to repeated orthostatic challenges in a single session...
  17. ncbi request reprint Ectopy in trauma patients: cautions for use of heart period variability in medical monitoring
    Girish Sethuraman
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234 6315, USA
    Aviat Space Environ Med 81:125-9. 2010
    ..We tested the hypothesis that ECGs from trauma patients exhibit a greater frequency of EBs than healthy human research subjects...
  18. ncbi request reprint Cerebral blood flow response and its association with symptoms during orthostatic hypotension
    Caroline A Rickards
    U S Army Institute of Surgical Research, Fort Sam Houston, TX 78234, USA
    Aviat Space Environ Med 78:653-8. 2007
    ..We tested the hypothesis that decreasing mean arterial pressure (MAP) by > 30% is associated with compromised cerebral autoregulation and orthostatic symptoms during a squat-stand test (SST)...
  19. doi request reprint Changes in pulse character and mental status are late responses to central hypovolemia
    Kathy L Ryan
    The U S Army Institute of Surgical Research, Fort Sam Houston, Texas 78234 6315, USA
    Prehosp Emerg Care 12:192-8. 2008
    ....
  20. doi request reprint Autonomic mechanisms associated with heart rate and vasoconstrictor reserves
    Victor A Convertino
    US Army Institute of Surgical Research, 3698 Chambers Pass, Fort Sam Houston, TX 78234 6315, USA
    Clin Auton Res 22:123-30. 2012
    ..Hemorrhage is accompanied by baroreflex-mediated tachycardia and vasoconstriction. The difference between baseline and maximum responses is defined as the heart rate (HR) and vasoconstrictor 'reserve'...
  21. ncbi request reprint A comparative assessment of two techniques for investigating initial cardiovascular reflexes under acute orthostatic stress
    Caroline A Rickards
    Aerospace Physiology Laboratory, School of Medical Sciences, Faculty of Life Sciences, RMIT University, PO Box 71, Bundoora, Victoria 3083, Australia
    Eur J Appl Physiol 90:449-57. 2003
    ....
  22. pmc Heart Rate Variability during Simulated Hemorrhage with Lower Body Negative Pressure in High and Low Tolerant Subjects
    Carmen Hinojosa-Laborde
    US Army Institute of Surgical Research, Fort Sam Houston, TX, USA
    Front Physiol 2:85. 2011
    ..These results indicate that while a small number of HRV metrics can accurately distinguish between LT and HT subjects using group mean data, individual HRV values are poor indicators of tolerance to hypovolemia...
  23. ncbi request reprint The effect of caffeine on the cardiovascular responses to head-up tilt
    Narelle M Berry
    Aerospace Physiology Laboratory, School of Medical Sciences, Division of Exercise Sciences, RMIT University, Bundoora, Victoria, Australia
    Aviat Space Environ Med 74:725-30. 2003
    ..Both caffeine and orthostasis have known cardiovascular effects. The possible interaction between these factors remains unknown. This study aimed to determine the effect of caffeine consumption on cardiovascular responses to head-up tilt...
  24. ncbi request reprint G-induced visual and cognitive disturbances in a survey of 65 operational fighter pilots
    Caroline A Rickards
    Aerospace Physiology Laboratory, School of Medical Sciences, Science, Engineering and Technology Portfolio, RMIT University, Bundoora, Victoria, Australia
    Aviat Space Environ Med 76:496-500. 2005
    ..Royal Australian Air Force (RAAF) pilots currently fly the F/A-18 and Hawk 127, producing +Gz accelerations up to +7.5 Gz, which places these pilots at risk of both A-LOC and G-LOC...
  25. ncbi request reprint Regulation of fuel metabolism by preexercise muscle glycogen content and exercise intensity
    Melissa J Arkinstall
    Exercise Metabolism Group, School of Medical Sciences, RMIT University, Bundoora, Victoria 3083, Australia
    J Appl Physiol 97:2275-83. 2004
    ..We conclude that, in moderately trained individuals, muscle glycogen availability (low vs. high) does not influence rates of plasma glucose disposal during either low- or moderate-intensity exercise...
  26. ncbi request reprint Noninvasively determined muscle oxygen saturation is an early indicator of central hypovolemia in humans
    Babs R Soller
    Dept of Anesthesiology, UMass Medical School, 55 Lake Ave North, Worcester, MA 01655, USA
    J Appl Physiol (1985) 104:475-81. 2008
    ..Spectroscopic determination of SmO2 is noninvasive and continuous, providing an early indication of impending cardiovascular collapse resulting from progressive reduction in central blood volume...
  27. doi request reprint Autonomic compensation to simulated hemorrhage monitored with heart period variability
    William H Cooke
    Department of Health and Kinesiology, University of Texas at San Antonio, San Antonio, TX 78249, USA
    Crit Care Med 36:1892-9. 2008
    ..To test the hypothesis that components of heart period variability track autonomic function during simulated hemorrhage in humans...
  28. ncbi request reprint Heart period variability in trauma patients may predict mortality and allow remote triage
    William H Cooke
    Department of Health and Kinesiology, The University of Texas at San Antonio, San Antonio, TX 78249, USA
    Aviat Space Environ Med 77:1107-12. 2006
    ..We tested the hypothesis that survival is associated with low relative HF/LF, and death is associated with high relative HF/LF...
  29. ncbi request reprint Oxygen saturation determined from deep muscle, not thenar tissue, is an early indicator of central hypovolemia in humans
    Babs R Soller
    Department of Anesthesiology, University of Massachusetts Medical School, Worcester, MA, USA
    Crit Care Med 36:176-82. 2008
    ....