Research Topics
| L A GeddesSummaryAffiliation: Purdue University Country: USA Publications
Research Grants
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Detail Information
Publications
Measurement of the direct-current (Faradic) resistance of the electrode-electrolyte interface for commonly used electrode materialsL 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...- Direct-current injury: electrochemical aspectsL 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... - Accuracy limitations of chronaxie valuesLeslie 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... - The duration of ventricular fibrillation required to produce pulseless electrical activityLeslie 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+... - The natural biochemical changes during ventricular fibrillation with cardiopulmonary resuscitation and the onset of postdefibrillation pulseless electrical activityLeslie A Geddes
Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907 2022, USA
Am J Emerg Med 24:577-81. 2006.... - The truth shall set you free. Development of the polygraphL 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 - The first accurate measurement of systolic and diastolic blood pressureL 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 - Evolution of our knowledge of sudden death due to commotio cordisLeslie 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... - Chest compression force of trained and untrained CPR rescuersLeslie 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... - A new cardiopulmonary resuscitation method using only rhythmic abdominal compression: a preliminary reportLeslie 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... 
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...- CPR degradation diagramL 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... - Ventricular fibrillation frequencyJ Callihan
Weldon School of Biomedical Engineering Department, Purdue University, West Lafayette, IN 47907-2022, USA
Pacing Clin Electrophysiol 28:610-2. 2005..CONCLUSION: Those who use VF wave frequency to identify the presence of VF should be aware of the nature of the VF wave frequency decrease with the passage of time... - Preimplant atrial defibrillation testing with a temporary catheter in sheepT 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... - Nonpulsatile and noninvasive transmittance and reflectance tissue-bed oximetryA 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... - The chronaxie for myocardium and motor nerve in the dog with chest-surface electrodesC 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... - Skin-temperature distribution under a new type of defibrillating electrodeJ 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... - Tumpy, the camel, and the electrical dose concept for ventricular defibrillationL A Geddes
Purdue University West Lafayette, Indiana 47907, USA
Pacing Clin Electrophysiol 26:1538-40. 2003 - Sustained abdominal compression during CPR raises coronary perfusion pressures as much as vasopressor drugsAaron E Lottes
Weldon School of Biomedical Engineering, Purdue University, 206 S Intramural Drive, West Lafayette, IN 47907 2032, USA
Resuscitation 75:515-24. 2007.... - Methods for calculating coronary perfusion pressure during CPRMichael 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... - Criteria for the selection of materials for implanted electrodesL 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... - Existence of a strength-duration curve for spinal cord motor evoked potentials in catsP 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... - Electrocardiograms from the turtle to the elephant that illustrate interesting physiological phenomenaL 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... - Mechanical remodeling of small-intestine submucosa small-diameter vascular grafts--a preliminary reportR 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... - Rhythmic abdominal compression CPR ventilates without supplemental breaths and provides effective blood circulationMichael 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... - The paradox in using electrically stimulated skeletal muscle to pump bloodL 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... - Electroventilation with monopolar and bipolar intratracheal electrodesZachary 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..Two different methods of intratracheal electroventilation can be used: monopolar, in which the return electrode is on the body surface; and bipolar, in which the return electrode is in the trachea... - An optical oscillometric method for neonatal and premature infant blood pressure monitoringRebecca A Roeder
Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Adv Neonatal Care 9:77-81. 2009.... - Biaxial strength of multilaminated extracellular matrix scaffoldsDonald 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... - Personal recollections of Otto Schmitt. Otto knew how to get people's attentionLeslie A Geddes
Biomedical Engineering Department, Purdue University, W. Lafayette, IN 47907-2022, USA
IEEE Eng Med Biol Mag 23:60-1. 2004 - Loose cuff hypertensionPervin 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 Grants
- Transducer for indirect blood pressure& O2 saturationLeslie 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. ..