L A Geddes

Summary

Affiliation: Purdue University
Country: USA

Publications

  1. ncbi request reprint Measurement of the direct-current (Faradic) resistance of the electrode-electrolyte interface for commonly used electrode materials
    L A Geddes
    Department of Biomedical Engineering, Purdue University, W Lafayettte, IN, USA
    Ann Biomed Eng 29:181-6. 2001
  2. ncbi request reprint Direct-current injury: electrochemical aspects
    L A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    J Clin Monit Comput 18:157-61. 2004
  3. ncbi request reprint Accuracy limitations of chronaxie values
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 1296, USA
    IEEE Trans Biomed Eng 51:176-81. 2004
  4. ncbi request reprint The duration of ventricular fibrillation required to produce pulseless electrical activity
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 23:138-41. 2005
  5. ncbi request reprint The natural biochemical changes during ventricular fibrillation with cardiopulmonary resuscitation and the onset of postdefibrillation pulseless electrical activity
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 24:577-81. 2006
  6. ncbi request reprint The truth shall set you free. Development of the polygraph
    L A Geddes
    Purdue University, Department of Biomedical Engineering, 1296 Potter Building, West Lafayette, Indiana 47907 1296, USA
    IEEE Eng Med Biol Mag 21:97-100. 2002
  7. ncbi request reprint The first accurate measurement of systolic and diastolic blood pressure
    L A Geddes
    Purdue University, Department of Biomedical Engineering, 1296 Potter Building, West Lafayette, Indiana 47907 1296, USA
    IEEE Eng Med Biol Mag 21:102-3. 2002
  8. ncbi request reprint Evolution of our knowledge of sudden death due to commotio cordis
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 23:67-75. 2005
  9. ncbi request reprint Chest compression force of trained and untrained CPR rescuers
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, 206 South Intramural Dr, West Lafayette, IN 47907 2032, USA
    Cardiovasc Eng 7:47-50. 2007
  10. ncbi request reprint A new cardiopulmonary resuscitation method using only rhythmic abdominal compression: a preliminary report
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, W Lafayette, IN 47907, USA
    Am J Emerg Med 25:786-90. 2007

Research Grants

Collaborators

Detail Information

Publications31

  1. ncbi request reprint Measurement of the direct-current (Faradic) resistance of the electrode-electrolyte interface for commonly used electrode materials
    L A Geddes
    Department of Biomedical Engineering, Purdue University, W Lafayettte, IN, USA
    Ann Biomed Eng 29:181-6. 2001
    ..The highest value for Rf0 was for carbon. This paper concludes with a summary of the data for Rf0 scaled to 1 cm2 electrode area for the electrode materials measured in the present study and data from the published literature...
  2. ncbi request reprint Direct-current injury: electrochemical aspects
    L A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    J Clin Monit Comput 18:157-61. 2004
    ..The lesions under the negative electrodes were more severe, indicating that alkali is more damaging than the acid environment that was produced electrolytically...
  3. ncbi request reprint Accuracy limitations of chronaxie values
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 1296, USA
    IEEE Trans Biomed Eng 51:176-81. 2004
    ..This paper identifies five factors that can affect the accuracy of chronaxie measurement and shows that the most reliable values can be obtained with a rectangular pulse delivered from a constant-current source...
  4. ncbi request reprint The duration of ventricular fibrillation required to produce pulseless electrical activity
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 23:138-41. 2005
    ..The longer the duration of VF, the higher the K+...
  5. ncbi request reprint The natural biochemical changes during ventricular fibrillation with cardiopulmonary resuscitation and the onset of postdefibrillation pulseless electrical activity
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 24:577-81. 2006
    ....
  6. ncbi request reprint The truth shall set you free. Development of the polygraph
    L A Geddes
    Purdue University, Department of Biomedical Engineering, 1296 Potter Building, West Lafayette, Indiana 47907 1296, USA
    IEEE Eng Med Biol Mag 21:97-100. 2002
  7. ncbi request reprint The first accurate measurement of systolic and diastolic blood pressure
    L A Geddes
    Purdue University, Department of Biomedical Engineering, 1296 Potter Building, West Lafayette, Indiana 47907 1296, USA
    IEEE Eng Med Biol Mag 21:102-3. 2002
  8. ncbi request reprint Evolution of our knowledge of sudden death due to commotio cordis
    Leslie A Geddes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Am J Emerg Med 23:67-75. 2005
    ..The conditions necessary for sustaining ventricular fibrillation and numerous examples of sudden death by commotio cordis are presented...
  9. ncbi request reprint Chest compression force of trained and untrained CPR rescuers
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, 206 South Intramural Dr, West Lafayette, IN 47907 2032, USA
    Cardiovasc Eng 7:47-50. 2007
    ..In view of the American Heart Association (AHA) guidelines (2000) to depress the chest 1.5 to 2 inches, which requires 100-125 lbs, it would appear that most laypersons do not exert enough force for effective CPR...
  10. ncbi request reprint A new cardiopulmonary resuscitation method using only rhythmic abdominal compression: a preliminary report
    Leslie A Geddes
    Weldon School of Biomedical Engineering, Purdue University, W Lafayette, IN 47907, USA
    Am J Emerg Med 25:786-90. 2007
    ..6 +/- 0.73 (P = .024). In other words, OAC-CPR produced 60% more coronary perfusion than standard chest-compression CPR, with no damage to visceral organs...
  11. doi request reprint How much lung ventilation is obtained with only chest-compression CPR?
    L A Geddes
    Weldon School of Biomedical Engineering, Purdue University, 206 S Martin Jischke Drive, West Lafayette, IN 47907 2032, USA
    Cardiovasc Eng 8:145-8. 2008
    ..49 +/- 0.64 l/min. The negative minute alveolar volume and fractional ratio reveals that TV was less than the dead space indicating that chest-compression alone does not ventilate the lungs...
  12. doi request reprint CPR degradation diagram
    L A Geddes
    Weldon School of Biomedical Engineering, Purdue University, 206 S Martin Jischke Drive, West Lafayette, IN 47907 2032, USA
    Cardiovasc Eng 9:56-8. 2009
    ..This paper describes the times when the EEG disappears, when respiratory arrest occurs, and when PD-PEA occurs. It also describes the frequency of VF waves over a 7-min period and how the frequency increases with good CPR...
  13. ncbi request reprint Ventricular fibrillation frequency
    J Callihan
    Weldon School of Biomedical Engineering Department, Purdue University, West Lafayette, IN 47907 2022, USA
    Pacing Clin Electrophysiol 28:610-2. 2005
    ..Ventricular-fibrillation (VF) wave frequency is known to decrease with prolonged, untreated VF. VF wave frequency is used as an algorithm to identify VF in AEDs and ICDs; yet the nature of the frequency change is not appreciated...
  14. ncbi request reprint Preimplant atrial defibrillation testing with a temporary catheter in sheep
    T Z Elabbady
    Purdue University, West Lafayette, Indiana, USA
    Pacing Clin Electrophysiol 20:1754-8. 1997
    ..These data indicate that temporary catheters can be used for efficacy testing prior to implant of an atrial defibrillator, and that they predict atrial defibrillation threshold adequately for chronic leads...
  15. ncbi request reprint Nonpulsatile and noninvasive transmittance and reflectance tissue-bed oximetry
    A Kemeny
    Department of Biomedical Engineering, Purdue University, 206 S Intramural Drive, West Lafayette, IN, 47907 1791, USA
    Cardiovasc Eng 6:145-50. 2006
    ..SaO(2) measurements ranged from 4% to 100%. It was found that both the transmittance and reflectance methods can be used to measure %SaO(2) reliably in situations with or without a pulse...
  16. ncbi request reprint The chronaxie for myocardium and motor nerve in the dog with chest-surface electrodes
    C R Voorhees
    Hillenbrand Biomedical Engineering Center, Purdue University, West Lafayette, IN 479007
    IEEE Trans Biomed Eng 39:624-8. 1992
    ..17 ms. The results of this study show that, because of the differing chronaxies, the current required to produce inspiration with short-duration stimuli is much less than that required to evoke an ectopic heart beat...
  17. ncbi request reprint Skin-temperature distribution under a new type of defibrillating electrode
    J D Bourland
    Hillenbrand Biomedical Engineering Center, Purdue University, West Lafayette, Indiana, USA
    Biomed Instrum Technol 32:164-8. 1998
    ..Temperature-time curves were obtained and the maximum temperature was identified. For 17 measurements at each site, the maximum temperature rise for a 360-joule shock was 317.3 +/- 53.0 millidegrees Celsius...
  18. ncbi request reprint Tumpy, the camel, and the electrical dose concept for ventricular defibrillation
    L A Geddes
    Purdue University West Lafayette, Indiana 47907, USA
    Pacing Clin Electrophysiol 26:1538-40. 2003
  19. ncbi request reprint Sustained abdominal compression during CPR raises coronary perfusion pressures as much as vasopressor drugs
    Aaron E Lottes
    Weldon School of Biomedical Engineering, Purdue University, 206 S Intramural Drive, West Lafayette, IN 47907 2032, USA
    Resuscitation 75:515-24. 2007
    ....
  20. doi request reprint Methods for calculating coronary perfusion pressure during CPR
    Michael P Otlewski
    MED Institute, Inc, West Lafayette, IN 47906, USA
    Cardiovasc Eng 9:98-103. 2009
    ..Electronically derived true mean coronary perfusion pressure is arguably the gold standard method for representing coronary perfusion pressure...
  21. ncbi request reprint Criteria for the selection of materials for implanted electrodes
    L A Geddes
    Purdue University, Department of Biomedical Engineering, 500 Central Drive, West Lafayette, IN 47907 2022, USA
    Ann Biomed Eng 31:879-90. 2003
    ..The paper concludes with an analysis, the design criteria, and the special properties and materials for capacitive recording and stimulating electrodes...
  22. ncbi request reprint Existence of a strength-duration curve for spinal cord motor evoked potentials in cats
    P E Konrad
    W A Hillenbrand Biomedical Engineering Center, Purdue University, W Lafayette, IN 47907
    Electroencephalogr Clin Neurophysiol 74:463-8. 1989
    ..Mean chronaxie values ranging from 190 to 337 microseconds were obtained. This study describes acquisition of strength-duration curves for short latency MEP peaks, but does not address the origin of these peaks...
  23. ncbi request reprint Electrocardiograms from the turtle to the elephant that illustrate interesting physiological phenomena
    L A Geddes
    Department of Biomedical Engineering, Purdue University, 1296 Potter Bldg, Rm 204, West Lafayette, IN 47907, USA
    Pacing Clin Electrophysiol 25:1762-70. 2002
    ..The ECGs of a cow and camel exhibit long P-R intervals and biphasic P waves. Finally the elephant ECG shows a clear U wave following the T wave...
  24. ncbi request reprint Mechanical remodeling of small-intestine submucosa small-diameter vascular grafts--a preliminary report
    R A Roeder
    Purdue University, Dept of Biomedical Engineering, 1296 Potter Bldg, Room 204, West Lafayette, IN 47907-1296, USA
    Biomed Instrum Technol 35:110-20. 2001
    ..The results of this preliminary study complement those of previous SIS-vascular-graft studies and add a new factor, namely that the mechanical properties of the remodeled graft approach those of the vessel it replaces...
  25. doi request reprint Rhythmic abdominal compression CPR ventilates without supplemental breaths and provides effective blood circulation
    Michael Pargett
    Weldon School of Biomedical Engineering, Purdue University, 206 S Martin Jischke Drive, West Lafayette, IN 47907 2032, USA
    Resuscitation 79:460-7. 2008
    ..Recently, we introduced a new CPR method that utilizes only rhythmic abdominal compressions (OAC-CPR). The present study compares ventilation and hemodynamics produced by chest and abdominal compression CPR...
  26. ncbi request reprint The paradox in using electrically stimulated skeletal muscle to pump blood
    L A Geddes
    Hillenbrand Biomedical Engineering Center, Purdue University, West Lafayette, Indiana 47907 1293, USA
    Pacing Clin Electrophysiol 20:1993-2002. 1997
    ..However, the high preload is only required just before muscle contraction. Two methods are described to attain the high preload and high muscle capillary blood flow...
  27. ncbi request reprint Electroventilation with monopolar and bipolar intratracheal electrodes
    Zachary W Sopcak
    Department of Biomedical Engineering, Purdue University, 1293 A A Potter Building, West Lafayette, IN 47907, USA
    Anesth Analg 95:189-91, table of contents. 2002
    ..These experiments demonstrated that a bipolar electrode can be used for electroventilation...
  28. doi request reprint An optical oscillometric method for neonatal and premature infant blood pressure monitoring
    Rebecca A Roeder
    Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
    Adv Neonatal Care 9:77-81. 2009
    ....
  29. ncbi request reprint Biaxial strength of multilaminated extracellular matrix scaffolds
    Donald O Freytes
    Department of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
    Biomaterials 25:2353-61. 2004
    ..e. vascular, musculotendinous, etc) by varying the number of layers and modifying the disinfection/sterilization treatments used for manufacturing...
  30. ncbi request reprint Personal recollections of Otto Schmitt. Otto knew how to get people's attention
    Leslie A Geddes
    Biomedical Engineering Department, Purdue University, W Lafayette, IN 47907 2022, USA
    IEEE Eng Med Biol Mag 23:60-1. 2004
  31. doi request reprint Loose cuff hypertension
    Pervin R Taleyarkhan
    College of Chemical Engineering, Purdue University, West Lafayette, IN 47907 2100, USA
    Cardiovasc Eng 9:113-8. 2009
    ..Lack of consistent cuff size and snugness procedures can lead to misdiagnosis of hypertension, acute patient discomfort, and inconvenient costs to the patient and health care provider...

Research Grants1

  1. Transducer for indirect blood pressure& O2 saturation
    Leslie Geddes; Fiscal Year: 2005
    ..The neonatologist, the premature infant physician and the small-infant pediatrician have no single instrument that provides all of these vital signs. ..