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1. Perioperative Hypothermia (33°C) Does Not Increase the Occurrence of Cardiovascular Events in Patients Undergoing Cerebral Aneurysm Surgery

Author

D. Chartrand, Michael Beven, C. Salem, W. Burnett, S. Jackson, G. Downey, Michael T. Lawton, S. Lownie, R. Tack, E. Dy, Tord D. Alden, David R. McIlroy, Lis Evered, K. Lukitto, L. Kirby, Thomas A. Moore, R. Popovic, N. Robertson, Patrick W. Hitchon, A. Ashtari, R. Elbe, N. F. Kassell, D. Dulli, A. Wyss, G. Ghazali, S. Rice, Gavin W. Britz, P. Bennett, Karen B. Domino, A. Shahen, D. Dehring, Robert Greif, Argye E. Hillis, L. Meng, D. Fishback, Fred Gentili, Mark Buckland, B. Schaefer, H. Madder, C. Weasler, Anish Bhardwaj, E. Thomson, Ramez W. Kirollos, Basil F. Matta, Kevin H. Siu, H. Machlin, W. Pfisterer, A. Freymuth, N. Badner, R. Wilson, R. Grauer, Zhiyi Zuo, A. McAllister, Z. Sha, A. Rushton, D. Hill, William T. Clarke, L. Jensen, G. Heard, L. Clark, D. Chatfield, J. Haartsen, Jing Wang, S. Nobles, Renee Testa, P. D'Urso, Hossam El-Beheiry, David J. Stone, James C. Torner, Michael J. Souter, A. Meyer, Marek A. Mirski, Marlan R. Hansen, W. Jenkins, L. Pobereskin, J. Walkes, M. Quigley, R. Struthers, James H McMahon, Howard A. Riina, Behnam Badie, P. Heppner, Simon Jones, R. Silbergleit, Thomas N. Pajewski, T. Broderick, Katherine Harris, P. Smythe, N. Duggal, J. Quaedackers, J. Mason, P. E. Bickler, P. McNeill, V. Roelfsema, I. Gibmeier, C. Chambers, H. Gramke, D. Campbell, T. Novick, O. Moise, J. Woletz, Lorri A. Lee, H. Van Aken, Adrian W. Gelb, A. Kane, B. Rapf, Martin S. Angst, S. Shaikh, D. Sirhan, C. Miller, B. Hodkinson, D. Leggett, F. Johnson, Harry J. M. Lemmens, M. Langley, Y. Young, Jeffrey V. Rosenfeld, C. Moy, W. Hamm, C. Hall, G. Henry, R. Burnstein, Lisa Hannegan, A. Buchmann, R. Schatzer, Bruce P. Hermann, John E. McGillicuddy, Bruno Giordani, John C. VanGilder, Keith H. Berge, D. Sage, L. Sternau, N. Page, Marc R. Mayberg, B Thompson, T. Hartman, Laurel E. Moore, S. Bhatia, Richard A. Jaffe, G. Seever, D. Cowie, Jonathan G. Zaroff, C. Duffy, Deborah A. Rusy, Elana Farace, H R Winn, Paul H. Ting, R. Spinka, J. Marler, Patricia H. Petrozza, S. Harding, Lauren C. Berkow, E. Cunningham, D. Bisnaire, D. Wilhite, P. Blanton, S. Laurent, O. Odukoya, Issam A. Awad, P. Chery, C. Lind, B. Bauer, D. Lindholm, K. Kieburtz, J. Ormrod, Michael P. Murphy, Timothy G. Short, Y. Painchaud, R. Peters, Peter C. Whitfield, D. Bain, B. Hindman, A. Shelton, A. Morris, D. Milovan, L. Salvia, William L. Young, S. Wallace, W. Lilley, H. Yi, R. Chelliah, David W. Newell, R. Deam, John Laidlaw, P. Mak, J. Woelfer, K. Graves, Peter M. C. Wright, D. Van Alstine, M. Hemstreet, Phillip A. Scott, Steven D. Chang, S. Poustie, M. Clausen, I. Herrick, Daniel H. Kim, Vladimir Zelman, John L.D. Atkinson, Marcel E. Durieux, Alessandro Olivi, G. Smith, James R. Munis, F. Vasarhelyi, S. Olson, C. Greiner, C. Hoenemann, G. Kleinpeter, J. Kish, Daniel K. Resnick, J. Lang, Dhanesh K. Gupta, E. Knosp, N. Monteiro de Oliveira, D. Moskopp, Carin A. Hagberg, J. Howell, Klaus Hahnenkamp, Gregory M. Davis, T. Phan, Paul S. Myles, C. Beven, F. Salevsky, Maria Matuszczak, E. Mee, David L. Bogdonoff, P. Berklayd, J. Freyhoff, P. Tanzi, A. Law, Barbara A. Dodson, Z. Thayer, R. Govindaraj, Alex Konstantatos, Ralph F. Frankowski, Pirjo H. Manninen, David G. Piepgras, K. Willmann, E. Babayan, Donald S. Prough, Leslie C. Jameson, John A. Wilson, Mary Pat McAndrews, M. Abou-Madi, Steven S. Glazier, Vincent C. Traynelis, Derek A. Taggard, Fredric B. Meyer, C. Bradfield, Hoang P. Nguyen, Mary L. Marcellus, J. Ogden, M. Maleki, M. Lotto, Michael A. Olympio, C. Merhaut, D. Nye, K. Webb, Richard Leblanc, Nichol McBee, William L. Lanier, A. Molnar, Peter J. Lennarson, S. Wadanamby, H. Hulbert, Christopher R. Turner, H. Fraley, Kevin K. Tremper, Sesto Cairo, J. Shafer, J. Krugh, D. Blair, L. Coghlan, P. Schmid, K. O'Brien, K. Littlewood, T. Anderson, R. Eliazo, S. Wirtz, Carol B. Applebury, Jennifer O. Hunt, S. Hickenbottom, Hendrik Freise, Gary D. Steinberg, M. Woodfield, Robert J. Dempsey, Kirk J. Hogan, M. Harrison, H. Stanko, Teresa Bell-Stephens, N. Merah, T. Blount, J. Sanders, J. Biddulph, Tsutomu Sasaki, F. Mensink, P. Balestrieri, Lisa D. Ravdin, H. Lohmann, M. Todd, James Gebel, Lawrence Litt, Christoph Schul, B. White, Bradley J. Hindman, S. Salerno, A. James, D. Manke, Mvon Lewinski, D. Luu, Michael M. Todd, A. Drnda, S. Salsbury, J. Palmisano, L. Connery, Michael Tymianski, E. Tuffiash, Cynthia A. Lien, R. Sawyer, A. Sills, D. Sinclair, J. Bramhall, Ira J. Rampil, David M. Colonna, M. Geraghty, Steven W. Anderson, V. Petty, S. Pai, J. Sheehan, S. Black, K. English, N. Scurrah, Diana G. McGregor, P. Davies, P. Doyle-Pettypiece, H. Bone, Neal J. Naff, M. Lenaerts, James Mitchell, K. Pedersen, Matthew A. Howard, M. Angliss, Daniel Tranel, Bongin Yoo, M. Irons, Emine O. Bayman, C. Skilbeck, Nicholas G. Bircher, Wendy C. Ziai, S. Micallef, Chuanyao Tong, Kathryn Chaloner, Mark T. Wallace, John Moloney, Gavin Fabinyi, P. Sutton, Edward C. Nemergut, Elizabeth Richardson, C. McCleary, M. Graf, Mrinalini Balki, P. Porter, James J. Evans, A. Prabhu, L. Kim, R. Hendrickson, A. Dashfield, V. Portman, Michel T. Torbey, J. Kruger, Donna L. Auer, J. Sorenson, Patricia H. Davis, John A. Walker, M. Mosier, H. Smith, J. Heidler, Andrew Silvers, P. Fogarty-Mack, William F. Chandler, F. Shutway, F. Rasulo, S. Alatakis, Stephen Samples, A. Wray, Henry H. Woo, John A. Ulatowski, Steven L. Giannotta, D. Chandrasekara, J. Sturm, S. Crump, Peter A. Rasmussen, Max R. Trenerry, D. Novy, Wink S. Fisher, N. Quinnine, F. Bardenhagen, M. Angle, W. Ng, G. Ferguson, A. Blackwell, Christopher M. Loftus, James H. Fitzpatrick, David S. Warner, E. Tuerkkan, W. Kutalek, Ferenc E. Gyulai, D. Daly, Helen Fletcher, J. Smith, Mazen A. Maktabi, Howard Yonas, J. Sneyd, M. Menhusen, Johnny E. Brian, K. Smith, R. Watson, T. Weber, D. Greene-Chandos, M. Wichman, Peter Szmuk, J. Birrell, Pekka Talke, J. Jane, L. Atkins, J. Smart, T. Han, B. O'Brien, R. Mattison, Bermans J. Iskandar, J. Ridgley, S. Dalrymple, L. Lindsey, D. Anderson, Julie B. Weeks, M. Felmlee-Devine, P. Deshmukh, D. Ellegala, L. Moss, A. Mathur, F. Lee, F. Sasse, H. Macgregor, R. Peterson, Margaret R. Weglinski, Karen Lane, Daniele Rigamonti, L. Carriere, Mark Wilson, R. Morgan, T. Costello, C. Thien, Arthur M. Lam, H. Bybee, C. Salmond, Robert E. Breeze, Peter Karzmark, Monica S. Vavilala, S. Yantha, Philip E. Stieg, Guy L. Clifton, Kenneth Manzel, D. Papworth, Rafael J. Tamargo, Rosemary A. Craen, Harold P. Adams, B. Radziszewska, Y. Kuo, Satwant K. Samra, B. Frankel, R. Fry, T. Cunningham, M. Mosa, M. McTaggart, F. Steinman, Alex Abou-Chebl, Michael J. Link, Rona G. Giffard, N. Lapointe, C. Meade, Robert F. Bedford, J. Cormack, Robert P. From, J. Reynolds, Paul A. Leonard, K. Quader, N. Subhas, C. Lothaller, S. Ryan, J. Winn, H. Brors, Amin B. Kassam, A. Gelb, J. Zaroff, Gregory M. Malham, A. Redmond, Gordon J. Chelune, J. Findlay, Zeyd Ebrahim, L. Forlano, Mark E. Shaffrey, C. Chase, Peter J. Kirkpatrick, Armin Schubert, L. Koller, Jana E. Jones, P. Li, and B. Chen

Subjects
medicine.medical_specialty, Subarachnoid hemorrhage, Interventional cardiology, business.industry, Vascular disease, Perioperative, Hypothermia, medicine.disease, Preoperative care, Anesthesiology and Pain Medicine, Aneurysm, Anesthesia, Anesthesiology, Medicine, medicine.symptom, business
Abstract

Background Perioperative hypothermia has been reported to increase the occurrence of cardiovascular complications. By increasing the activity of sympathetic nervous system, perioperative hypothermia also has the potential to increase cardiac injury and dysfunction associated with subarachnoid hemorrhage. Methods The Intraoperative Hypothermia for Aneurysm Surgery Trial randomized patients undergoing cerebral aneurysm surgery to intraoperative hypothermia (n = 499, 33.3 degrees +/- 0.8 degrees C) or normothermia (n = 501, 36.7 degrees +/- 0.5 degrees C). Cardiovascular events (hypotension, arrhythmias, vasopressor use, myocardial infarction, and others) were prospectively followed until 3-month follow-up and were compared in hypothermic and normothermic patients. A subset of 62 patients (hypothermia, n = 33; normothermia, n = 29) also had preoperative and postoperative (within 24 h) measurement of cardiac troponin-I and echocardiography to explore the association between perioperative hypothermia and subarachnoid hemorrhage-associated myocardial injury and left ventricular function. Results There was no difference between hypothermic and normothermic patients in the occurrence of any single cardiovascular event or in composite cardiovascular events. There was no difference in mortality (6%) between groups, and there was only a single primary cardiovascular death (normothermia). There was no difference between hypothermic and normothermic patients in postoperative versus preoperative left ventricular regional wall motion or ejection fraction. Compared with preoperative values, hypothermic patients had no postoperative increase in cardiac troponin-I (median change 0.00 microg/l), whereas normothermic patients had a small postoperative increase (median change + 0.01 microg/l, P = 0.038). Conclusion In patients undergoing cerebral aneurysm surgery, perioperative hypothermia was not associated with an increased occurrence of cardiovascular events.

Published
2010
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2. No Association between Intraoperative Hypothermia or Supplemental Protective Drug and Neurologic Outcomes in Patients Undergoing Temporary Clipping during Cerebral Aneurysm Surgery

Author

John A. Ulatowski, Steven L. Giannotta, J. Sturm, D. Cowie, D. Novy, N. Quinnine, James H. Fitzpatrick, David S. Warner, Ferenc E. Gyulai, D. Daly, S. Rice, H. Machlin, William T. Clarke, Philip E. Bickler, H. Van Aken, M. Langley, M. von Lewinski, G. Kleinpeter, J. Freyhoff, A. Morris, L. Salvia, Peter M. C. Wright, Wolfgang K. Pfisterer, K. English, M. Lenaerts, Nicholas G. Bircher, Simon Jones, L. Jensen, Issam A. Awad, P. Chery, B. Schaefer, S. Wallace, F. Johnson, H. Smith, J. Biddulph, T. Cunningham, N. Monteirode Oliveira, R. Watson, A. McAllister, D. Moskopp, Patricia H. Petrozza, B. Hindman, A. Shelton, D. Manke, F. Steinman, D. Luu, Alex Abou-Chebl, J. Birrell, M. Irons, J. Ridgley, Gavin Fabinyi, S. Alatakis, Basil F. Matta, James J. Evans, A. Prabhu, Rona G. Giffard, H. Gramke, Hendrik Freise, K. Graves, P. Fogarty-Mack, L. Clark, Wink S. Fisher, K. Smith, Renee Testa, P. D'Urso, A. Freymuth, James C. Torner, M. Wallace, R. Struthers, Howard A. Riina, Z. Thayer, Daniel Tranel, E. Knosp, E. Dy, Tord D. Alden, Henry H. Woo, Bruce P. Hermann, John C. VanGilder, Douglas Campbell, N. Lapointe, Gavin W. Britz, J. Sheehan, C. Meade, M. Balki, C. Bradfield, Alessandro Olivi, P. Doyle-Pettypiece, Robert F. Bedford, F. Bardenhagen, M. Angle, Donald S. Prough, John E. McGillicuddy, A. Drnda, M. Abou-Madi, S. Black, David R. McIlroy, Lis Evered, S. Poustie, J. Cormack, J. Sneyd, M. Menhusen, William L. Lanier, M. Maleki, T. Phan, D. Nye, M. Graf, Michael A. Olympio, N. Robertson, Teresa Bell-Stephens, E. Tuerkkan, N. Merah, S. Olson, L. Kirby, L. Moss, Peter Heppner, Thomas A. Moore, J. Bramhall, H. Madder, Christopher R. Turner, H. Fraley, James Mitchell, K. Pedersen, M. Angliss, Robert P. From, Y. Painchaud, Gary D. Steinberg, J. Woelfer, K. Littlewood, T. Anderson, J. Palmisano, M. Clausen, Paul H. Ting, Lisa D. Ravdin, H. Lohmann, R. Burnstein, R. Popovic, T. Hartman, D. Anderson, Julie B. Weeks, H. Macgregor, Kirk J. Hogan, D. Chatfield, Daniel H. Kim, James R. Munis, J. Lang, J. Reynolds, Michael M. Todd, F. Mensink, L. Pobereskin, J. Walkes, Mary Pat McAndrews, A. Sills, Bongin Yoo, P. Balestrieri, S. Micallef, Mary L. Marcellus, J. Wang, Kathryn Chaloner, Patrick W. Hitchon, Paul A. Leonard, C. McCleary, Lawrence Litt, N. Subhas, Wendy C. Ziai, James H McMahon, V. Petty, P. Smythe, G. Heard, Michael J. Souter, R. Hendrickson, A. Dashfield, V. Portman, Edward C. Nemergut, Patricia H. Davis, W. Burnett, M. Lotto, Y. Young, S. Jackson, J. Quaedackers, S. Ryan, Helen Fletcher, A. Ashtari, N. F. Kassell, Anish Bhardwaj, E. Thomson, Ramez W. Kirollos, Margaret R. Weglinski, Karen Lane, Daniele Rigamonti, J. Winn, Bradley J. Hindman, S. Salerno, L. Kim, R. Sawyer, Peter J. Lennarson, S. Wadanamby, Zhiyi Zuo, William F. Chandler, F. Shutway, P. Bennett, C. Merhaut, D. Hill, J. Haartsen, N. Badner, T. Weber, Rafael J. Tamargo, D. Fishback, Rosemary A. Craen, Michel T. Torbey, O. Odukoya, D. Chartrand, J. Jane, Michael T. Lawton, A. Buchmann, Richard A. Jaffe, P. Berklayd, T. Blount, J. Sanders, J. Marler, L. Meng, R. Grauer, Y. Kuo, O. Moise, P. Tanzi, R. Govindaraj, Alex Konstantatos, D. Greene-Chandos, G. Downey, M. Wichman, D. Chandrasekara, Amin B. Kassam, Max R. Trenerry, R. Elbe, A. Wyss, R. Peterson, D. Sirhan, C. Miller, Marek A. Mirski, Stephen Samples, H. Brors, Michael Beven, M. Woodfield, William L. Young, D. Leggett, A. Wray, Karen B. Domino, Robert Greif, Argye E. Hillis, Gary G. Ferguson, Steven S. Glazier, J. Shafer, J. Krugh, I. Gibmeier, G. Ghazali, W. Ng, R. Tack, R. Schatzer, B. O'Brien, Bermans J. Iskandar, B. Bauer, C. Lind, C. Weasler, Michael Tymianski, E. Tuffiash, W. Hamm, C. Hall, L. Sternau, N. Page, Marc R. Mayberg, B Thompson, Richard Leblanc, A. Shahen, Laurel E. Moore, S. Bhatia, Nichol McBee, P. Davies, James Gebel, Cynthia A. Lien, J. Ormrod, David M. Colonna, D. Dehring, A. Rushton, P. Blanton, C. Lothaller, Diana G. McGregor, S. Harding, Lauren C. Berkow, D. Van Alstine, M. Hemstreet, A. Blackwell, Christopher M. Loftus, Klaus Hahnenkamp, J. Woletz, D. Lindholm, K. Kieburtz, M. Geraghty, Steven W. Anderson, D. Dulli, M. McTaggart, Fred Gentili, Johnny E. Brian, R. Peters, C. Greiner, Marlan R. Hansen, W. Jenkins, T. Broderick, Katherine Harris, B. Radziszewska, Maria Matuszczak, David L. Bogdonoff, K. Quader, Pekka Talke, B. Hodkinson, C. Hoenemann, C. Duffy, Deborah A. Rusy, R. Silbergleit, J. Findlay, Gregory M. Davis, J. Ogden, Adrian W. Gelb, A. Kane, Satwant K. Samra, E. Babayan, S. Dalrymple, Harry J. M. Lemmens, Tsutomu Sasaki, Lisa Hannegan, R. Eliazo, B. Frankel, D. Bisnaire, F. Salevsky, Michael J. Link, Jeffrey V. Rosenfeld, D. Sage, D. Sinclair, Keith H. Berge, D. Wilhite, Steven D. Chang, J. Kish, Carin A. Hagberg, Matthew A. Howard, Elizabeth Richardson, Peter C. Whitfield, D. Bain, Barbara A. Dodson, S. Crump, David G. Piepgras, John A. Wilson, David W. Newell, R. Deam, John Laidlaw, K. Willmann, J. Heidler, Vincent C. Traynelis, K. Webb, P. Li, A. Mathur, S. Hickenbottom, S. Wirtz, L. Lindsey, H. Stanko, Mark Wilson, S. Salsbury, L. Connery, Robert J. Dempsey, Edward W. Mee, R. Morgan, Ira J. Rampil, V. Roelfsema, Christoph Schul, B. White, A. James, N. Scurrah, C. Thien, Arthur M. Lam, P. Mak, Behnam Badie, Guy L. Clifton, R. Wilson, J. Kruger, Donna L. Auer, M. Mosier, S. Nobles, David J. Stone, A. Law, Timothy G. Short, W. Lilley, H. Yi, Marcel E. Durieux, Daniel K. Resnick, Dhanesh K. Gupta, Paul S. Myles, C. Beven, Thomas N. Pajewski, J. Mason, P. McNeill, F. Lee, Bruno Giordani, Leslie C. Jameson, G. Seever, Stephen P. Lownie, Fredric B. Meyer, P. Porter, K. O'Brien, Vladimir Zelman, John L.D. Atkinson, A. Molnar, H. Hulbert, S. Pai, Neal J. Naff, S. Shaikh, M. Mosa, Pirjo H. Manninen, Derek A. Taggard, Ian A. Herrick, Mark E. Shaffrey, Carol B. Applebury, C. Chase, Neil Duggal, Mark Buckland, M. Quigley, D. Milovan, Michael J. Harrison, Peter J. Kirkpatrick, Armin Schubert, R. Mattison, Ralph F. Frankowski, R. Chelliah, Jana E. Jones, J. Howell, H. Bone, Emine O. Bayman, P. Deshmukh, C. Skilbeck, P. Sutton, B. Chen, L. Carriere, J. Sorenson, Andrew Silvers, F. Sasse, F. Rasulo, Gordon J. Chelune, Zeyd Ebrahim, L. Forlano, Chuanyao Tong, John Moloney, Michael P. Murphy, S. Yantha, W. Kutalek, Kevin K. Tremper, C. Chambers, Sesto Cairo, Robert E. Breeze, A. Meyer, Monica S. Vavilala, C. Salem, H. El-Beheiry, Gregory M. Malham, A. Redmond, L. Koller, Kenneth Manzel, D. Papworth, C. Moy, G. Henry, Elana Farace, H R Winn, E. Cunningham, B. Rapf, J. Smith, Mazen A. Maktabi, Howard Yonas, D. Ellegala, Kevin H. Siu, Lorri A. Lee, Phillip A. Scott, K. Lukitto, Jennifer O. Hunt, D. Blair, P. Schmid, M. Felmlee-Devine, Peter A. Rasmussen, Peter Szmuk, L. Atkins, J. Smart, T. Han, T. Costello, H. Bybee, C. Salmond, Peter Karzmark, Philip E. Stieg, Harold P. Adams, T. Novick, Z. Sha, Martin S. Angst, S. Laurent, G. Smith, F. Vasarhelyi, R. A. Fry, and John A. Walker

Subjects
medicine.medical_specialty, business.industry, Vascular disease, Glasgow Outcome Scale, Odds ratio, Hypothermia, medicine.disease, law.invention, Surgery, Anesthesiology and Pain Medicine, Aneurysm, Randomized controlled trial, law, Anesthesia, Anesthesiology, Medicine, medicine.symptom, business, Prospective cohort study
Abstract

Background Although hypothermia and barbiturates improve neurologic outcomes in animal temporary focal ischemia models, the clinical efficacy of these interventions during temporary occlusion of the cerebral vasculature during intracranial aneurysm surgery (temporary clipping) is not established. Methods A post hoc analysis of patients from the Intraoperative Hypothermia for Aneurysm Surgery Trial who underwent temporary clipping was performed. Univariate and multivariate logistic regression methods were used to test for associations between hypothermia, supplemental protective drug, and short- (24-h) and long-term (3-month) neurologic outcomes. An odds ratio more than 1 denotes better outcome. Results Patients undergoing temporary clipping (n = 441) were assigned to intraoperative hypothermia (33.3 degrees +/- 0.8 degrees C, n = 208) or normothermia (36.7 degrees +/- 0.5 degrees C, n = 233), with 178 patients also receiving supplemental protective drug (thiopental or etomidate) during temporary clipping. Three months after surgery, 278 patients (63%) had good outcome (Glasgow Outcome Score = 1). Neither hypothermia (P = 0.847; odds ratio = 1.043, 95% CI = 0.678-1.606) nor supplemental protective drug (P = 0.835; odds ratio = 1.048, 95% CI = 0.674-1.631) were associated with 3-month Glasgow Outcome Score. The effect of supplemental protective drug did not significantly vary with temperature. The effects of hypothermia and protective drug did not significantly vary with temporary clip duration. Similar findings were made for 24-h neurologic status and 3-month Neuropsychological Composite Score. Conclusion In the Intraoperative Hypothermia for Aneurysm Surgery Trial, neither systemic hypothermia nor supplemental protective drug affected short- or long-term neurologic outcomes of patients undergoing temporary clipping.

Published
2010
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3. Safety Studies for a 44-Channel Suprachoroidal Retinal Prosthesis: A Chronic Passive Study

Author

Robert K. Shepherd, Ceara McGowan, Alice Brandli, Stephanie B. Epp, Owen Burns, Jonathan Yeoh, Carla J Abbott, Mohit N. Shivdasani, Penelope J Allen, David A X Nayagam, Jenny Zhou, Richard A. Williams, Patrick C. Thien, Joel Villalobos, Helen Feng, Cesar M. Salinas-LaRosa, Chi D Luu, Jason Leavens, and Chris E. Williams

Subjects
medicine.medical_specialty, Intraocular pressure, Prosthesis Implantation, Fundus (eye), Retina, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Ophthalmology, medicine, Electrode array, Animals, Choroid, business.industry, Retinal, Electrodes, Implanted, Visual Prosthesis, Sclera, Disease Models, Animal, medicine.anatomical_structure, chemistry, Visual prosthesis, Cats, 030221 ophthalmology & optometry, business, Microelectrodes, 030217 neurology & neurosurgery
Abstract

Purpose: Following successful clinical outcomes of the prototype suprachoroidal retinal prosthesis, Bionic Vision Australia has developed an upgraded 44-channel suprachoroidal retinal prosthesis to provide a wider field of view and more phosphenes. The aim was to evaluate the preclinical passive safety characteristics of the upgraded electrode array. Methods: Ten normal-sighted felines were unilaterally implanted with an array containing platinum electrodes (44 stimulating and 2 returns) on a silicone carrier near the area centralis. Clinical assessments (color fundus photos, optical coherence tomography, full-field electroretinography, intraocular pressure) were performed under anesthesia prior to surgery, and longitudinally for up to 20 weeks. Histopathology grading of fibrosis and inflammation was performed in two animals at 13 to 15 weeks. Results: Eight animals showed safe electrode array insertion (good retinal health) and good conformability of the array to the retinal curvature. Eight animals demonstrated good mechanical stability of the array with only minor (

Published
2018
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4. A Flexible Wireless System for Preclinical Evaluation of Retinal Prosthesis

Author

Stephanie B. Epp, David A X Nayagam, Patrick C. Thien, and Rodney E. Millard

Subjects
National health, Engineering, Government, Bionics, business.industry, Research initiative, Medical research, Vision science, Research council, Retinal Prosthesis, General Materials Science, Engineering ethics, business, Instrumentation
Abstract

This research was supported by the Australian Research Council (ARC) through its Special Research Initiative (SRI) in Bionic Vision Science and Technology grant to Bionic Vision Australia (BVA). Further support was provided by a National Health and Medical Research Council Development Grant (APP1120664). The Bionics Institute receives Operational Infrastructure Support from the Victorian Government. The Bionics Institute would also like to acknowledge support from the Bertalli Family Trust and the J T Reid Charitable Trust.

Published
2018
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5. AKT activation by uni-axial mechanical stimulation is essential for repair of micro damages in tendon during daily activities

Author

C. Thien, Allan Wang, J. Gao, Minghao Zheng, Jay R. Ebert, T. Wang, and Q. Zheng

Subjects
medicine.medical_specialty, Activities of daily living, medicine.anatomical_structure, business.industry, medicine, Damages, Physical Therapy, Sports Therapy and Rehabilitation, Orthopedics and Sports Medicine, Stimulation, business, Protein kinase B, Surgery, Tendon
Published
2017
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6. Chronic electrical stimulation with a suprachoroidal retinal prosthesis: a preclinical safety and efficacy study

Author

Chris E. Williams, Michelle McPhedran, Jin Xu, Penelope J Allen, Jonathan Yeoh, Mohit N. Shivdasani, Lauren N Ayton, Richard A. Williams, Sue Finch, Robert K. Shepherd, Patrick C. Thien, Alexia L. Saunders, Ceara McGowan, David A X Nayagam, Andrew K. Wise, James B Fallon, Cesar M. Salinas-LaRosa, Helen Feng, Melanie A. McWade, Rodney E. Millard, Chi D Luu, and Joel Villalobos

Subjects
Bionics, Pathology, genetic structures, Visual System, lcsh:Medicine, Stimulation, Electric Impedance, Medicine and Health Sciences, Medicine, lcsh:Science, Visual Cortex, Multidisciplinary, medicine.diagnostic_test, Animal Models, Immunohistochemistry, Sensory Systems, Electrodes, Implanted, Visual Prosthesis, medicine.anatomical_structure, Engineering and Technology, Retinal Disorders, Anatomy, Tomography, Optical Coherence, Research Article, Biotechnology, medicine.medical_specialty, Histology, Biomedical Engineering, Bioengineering, Surgical and Invasive Medical Procedures, Research and Analysis Methods, Retina, Model Organisms, Ophthalmology, Electrode array, Electroretinography, Functional electrical stimulation, Animals, business.industry, lcsh:R, Biology and Life Sciences, eye diseases, Electric Stimulation, Visual cortex, Visual prosthesis, Cats, Linear Models, lcsh:Q, Medical Devices and Equipment, Implant, business, Neuroscience
Abstract

Purpose To assess the safety and efficacy of chronic electrical stimulation of the retina with a suprachoroidal visual prosthesis. Methods Seven normally-sighted feline subjects were implanted for 96–143 days with a suprachoroidal electrode array and six were chronically stimulated for 70–105 days at levels that activated the visual cortex. Charge balanced, biphasic, current pulses were delivered to platinum electrodes in a monopolar stimulation mode. Retinal integrity/function and the mechanical stability of the implant were assessed monthly using electroretinography (ERG), optical coherence tomography (OCT) and fundus photography. Electrode impedances were measured weekly and electrically-evoked visual cortex potentials (eEVCPs) were measured monthly to verify that chronic stimuli were suprathreshold. At the end of the chronic stimulation period, thresholds were confirmed with multi-unit recordings from the visual cortex. Randomized, blinded histological assessments were performed by two pathologists to compare the stimulated and non-stimulated retina and adjacent tissue. Results All subjects tolerated the surgical and stimulation procedure with no evidence of discomfort or unexpected adverse outcomes. After an initial post-operative settling period, electrode arrays were mechanically stable. Mean electrode impedances were stable between 11–15 kΩ during the implantation period. Visually-evoked ERGs & OCT were normal, and mean eEVCP thresholds did not substantially differ over time. In 81 of 84 electrode-adjacent tissue samples examined, there were no discernible histopathological differences between stimulated and unstimulated tissue. In the remaining three tissue samples there were minor focal fibroblastic and acute inflammatory responses. Conclusions Chronic suprathreshold electrical stimulation of the retina using a suprachoroidal electrode array evoked a minimal tissue response and no adverse clinical or histological findings. Moreover, thresholds and electrode impedance remained stable for stimulation durations of up to 15 weeks. This study has demonstrated the safety and efficacy of suprachoroidal stimulation with charge balanced stimulus currents.

Published
2013

7. Perioperative fever and outcome in surgical patients with aneurysmal subarachnoid hemorrhage

Author

David G. Piepgras, David R. McIlroy, John A. Wilson, H. Yi, Lis Evered, J. Sheehan, Marcel E. Durieux, Daniel K. Resnick, L. Kirby, M. Abou-Madi, Michael A. Olympio, Dhanesh K. Gupta, Peter Heppner, Thomas A. Moore, Paul S. Myles, S. Wirtz, Richard Leblanc, C. Beven, Robert J. Dempsey, Edward W. Mee, Nichol McBee, P. Davies, V. Roelfsema, Christoph Schul, B. White, Leslie C. Jameson, A. James, R. Popovic, Kirk J. Hogan, Fredric B. Meyer, Klaus Hahnenkamp, Patrick W. Hitchon, L. Clark, M. Geraghty, Qian Shi, R. Struthers, Howard A. Riina, A. Drnda, D. Chartrand, Bradley J. Hindman, S. Salerno, E. Knosp, J. Bramhall, Bruce P. Hermann, A. Ashtari, N. F. Kassell, Steven W. Anderson, Maria Matuszczak, David L. Bogdonoff, B. Schaefer, John C. VanGilder, K. O'Brien, A. McAllister, D. Luu, L. Jensen, Issam A. Awad, P. Chery, S. Wallace, H. Smith, N. Monteirode Oliveira, G. Downey, R. Elbe, A. Wyss, E. Babayan, J. Woletz, H. Gramke, M. Irons, Gavin Fabinyi, O. Odukoya, R. Hendrickson, Vincent C. Traynelis, A. Dashfield, V. Portman, Alessandro Olivi, James J. Evans, A. Prabhu, Peter C. Whitfield, Gary D. Steinberg, S. Rice, H. Machlin, D. Bisnaire, P. Berklayd, G. Kleinpeter, Patricia H. Davis, D. Bain, William F. Chandler, R. Wilson, W. Ng, K. Webb, F. Shutway, D. Manke, W. Pfisterer, K. Smith, M. Mosa, Michael M. Todd, R. Tack, Philip E. Bickler, S. Alatakis, A. Shahen, D. Dehring, David W. Newell, A. Sills, K. Lukitto, Wink S. Fisher, R. Watson, Teresa Bell-Stephens, Donald S. Prough, M. Maleki, D. Nye, M. Graf, S. Nobles, David J. Stone, Hendrik Freise, R. Deam, John Laidlaw, K. Quader, Douglas Campbell, Fred Gentili, S. Hickenbottom, Marlan R. Hansen, W. Jenkins, T. Broderick, Katherine Harris, Gavin W. Britz, M. Langley, Mary Pat McAndrews, Wendy C. Ziai, Behnam Badie, C. Duffy, Deborah A. Rusy, K. Littlewood, T. Anderson, J. Palmisano, H. Stanko, Henry H. Woo, Edward C. Nemergut, C. Bradfield, A. Molnar, John A. Walker, Christina M. Spofford, D. Dulli, A. Kane, J. Birrell, Harry J. M. Lemmens, M. Lotto, Y. Young, J. Biddulph, T. Cunningham, L. Kim, K. Graves, B. Radziszewska, S. Salsbury, Lawrence Litt, S. Black, F. Bardenhagen, M. Angle, L. Connery, Lisa Hannegan, Helen Fletcher, John A. Ulatowski, Steven L. Giannotta, J. Sturm, R. Sawyer, H. Hulbert, A. Morris, James Mitchell, M. von Lewinski, C. Merhaut, L. Salvia, A. Freymuth, James C. Torner, D. Cowie, Bongin Yoo, Y. Kuo, S. Micallef, Kathryn Chaloner, Neil Duggal, J. Ogden, Peter M. C. Wright, K. Pedersen, C. McCleary, P. Mak, Paul H. Ting, S. Shaikh, B. Hodkinson, J. Sneyd, D. Novy, M. Menhusen, N. Quinnine, James H. Fitzpatrick, Timothy G. Short, M. Angliss, R. Burnstein, D. Moskopp, N. Robertson, Mark Buckland, Jeffrey V. Rosenfeld, W. Lilley, T. Phan, D. Greene-Chandos, M. Wichman, David S. Warner, M. Quigley, P. Tanzi, Ferenc E. Gyulai, D. Daly, Satwant K. Samra, B. Frankel, D. Wilhite, L. Lindsey, K. English, M. Lenaerts, Michel T. Torbey, T. Hartman, John E. McGillicuddy, R. Govindaraj, Alex Konstantatos, M. Woodfield, Steven S. Glazier, Steven D. Chang, C. Greiner, F. Steinman, Alex Abou-Chebl, G. Heard, S. Yantha, Michael J. Souter, C. Hoenemann, Nicholas G. Bircher, H. Van Aken, S. Poustie, D. Hill, J. Kish, Carin A. Hagberg, A. Buchmann, B. O'Brien, J. Shafer, J. Krugh, D. Chandrasekara, R. Eliazo, Mary L. Marcellus, Anish Bhardwaj, E. Thomson, H. El-Beheiry, Bermans J. Iskandar, J. Ormrod, D. Milovan, Michael J. Link, Barbara A. Dodson, S. Crump, K. Willmann, H. Madder, William R. Clarke, Max R. Trenerry, Ramez W. Kirollos, James Gebel, Lisa D. Ravdin, D. Sirhan, C. Miller, R. Grauer, Ira J. Rampil, W. Burnett, Marek A. Mirski, D. Chatfield, J. Haartsen, Jing Wang, H. Lohmann, T. Weber, S. Jackson, J. Quaedackers, Michael Beven, N. Scurrah, L. Pobereskin, J. Walkes, Zhiyi Zuo, Rona G. Giffard, J. Ridgley, James H McMahon, P. Bennett, J. Freyhoff, J. Reynolds, R. Chelliah, J. Jane, Basil F. Matta, P. Smythe, I. Gibmeier, A. Mathur, Karen B. Domino, Robert Greif, A. Wray, W. Hamm, C. Hall, Ralph F. Frankowski, H. Brors, Renee Testa, D. Fishback, Laurel E. Moore, Richard A. Jaffe, O. Moise, P. D'Urso, Argye E. Hillis, C. Weasler, Michael Tymianski, E. Tuffiash, Cynthia A. Lien, David M. Colonna, C. Lothaller, S. Bhatia, H. Bone, S. Harding, Diana G. McGregor, Lauren C. Berkow, A. Gelb, Paul A. Leonard, N. Subhas, Emine O. Bayman, William L. Young, A. Rushton, J. Marler, J. Kruger, Donna L. Auer, D. Lindholm, K. Kieburtz, R. Schatzer, D. Leggett, M. Mosier, D. Anderson, Julie B. Weeks, B. Bauer, F. Saleversusky, Mark Wilson, C. Skilbeck, R. Morgan, D. Van Alstine, S. Olson, M. Hemstreet, Y. Painchaud, P. Sutton, A. Blackwell, Christopher M. Loftus, S. Ryan, J. Winn, R. Silbergleit, R. Peters, J. Woelfer, M. Clausen, Daniel H. Kim, James R. Munis, J. Lang, A. Law, N. Badner, Keith H. Berge, D. Ellegala, Kevin H. Siu, Gordon J. Chelune, Rafael J. Tamargo, Rosemary A. Craen, C. Thien, Peter J. Lennarson, S. Wadanamby, R. Peterson, T. Blount, J. Sanders, Amin B. Kassam, Arthur M. Lam, Z. Thayer, N. Lapointe, C. Meade, Robert F. Bedford, Lorri A. Lee, J. Cormack, E. Tuerkkan, L. Carriere, N. Merah, Robert P. From, J. Sorenson, Phillip A. Scott, S. Pai, Neal J. Naff, Andrew Silvers, P. Fogarty-Mack, Jennifer O. Hunt, P. Porter, Guy L. Clifton, Zeyd Ebrahim, F. Rasulo, Pirjo H. Manninen, Derek A. Taggard, Michael J. Harrison, Ian A. Herrick, R. Mattison, Tsutomu Sasaki, P. Deshmukh, L. Forlano, Vladimir Zelman, Carol B. Applebury, John L.D. Atkinson, D. Sage, D. Sinclair, Matthew A. Howard, Elizabeth Richardson, F. Sasse, J. Heidler, Thomas N. Pajewski, J. Mason, P. McNeill, F. Lee, Bruno Giordani, G. Seever, Stephen P. Lownie, M. Wallace, Mark E. Shaffrey, C. Chase, Robert E. Breeze, Monica S. Vavilala, Kenneth Manzel, D. Papworth, Peter J. Kirkpatrick, Jana E. Jones, J. Howell, P. Li, B. Chen, A. Meyer, C. Salem, W. Kutalek, L. Koller, B. Rapf, J. Smith, Mazen A. Maktabi, Howard Yonas, Gregory M. Malham, A. Redmond, C. Moy, G. Henry, Elana Farace, H R Winn, E. Cunningham, Michael P. Murphy, Kevin K. Tremper, C. Chambers, Sesto Cairo, Chuanyao Tong, John Moloney, T. Novick, Z. Sha, Martin S. Angst, S. Laurent, G. Smith, F. Vasarhelyi, R. A. Fry, D. Blair, P. Schmid, Peter A. Rasmussen, Stephen Samples, Peter Szmuk, L. Atkins, J. Smart, T. Han, T. Costello, M. Balki, H. Bybee, C. Salmond, Peter Karzmark, Philip E. Stieg, Harold P. Adams, C. Lind, M. McTaggart, Johnny E. Brian, Pekka Talke, S. Dalrymple, M. Felmlee-Devine, Simon Jones, G. Ghazali, F. Johnson, Patricia H. Petrozza, B. Hindman, A. Shelton, Daniel Tranel, P. Blanton, L. Moss, H. Macgregor, J. Findlay, J. Weeks, Margaret R. Weglinski, Karen Lane, Daniele Rigamonti, Gregory M. Davis, William L. Lanier, Christopher R. Turner, H. Fraley, F. Mensink, P. Balestrieri, V. Petty, Michael T. Lawton, L. Meng, Gary G. Ferguson, L. Sternau, N. Page, Marc R. Mayberg, B Thompson, E. Dy, Tord D. Alden, and P. Doyle-Pettypiece

Subjects
Perioperative fever, Adult, Male, medicine.medical_specialty, Subarachnoid hemorrhage, Neuropsychological Tests, Severity of Illness Index, Neurosurgical Procedures, Statistics, Nonparametric, Hypothermia, Induced, Severity of illness, Medicine, Humans, Aged, Retrospective Studies, Neurologic Examination, Intraoperative Care, business.industry, Glasgow Outcome Scale, Incidence, Retrospective cohort study, Perioperative, Middle Aged, Subarachnoid Hemorrhage, outcome, aneurysmal subarachnoid hemorrhage, medicine.disease, Hydrocephalus, Surgery, Clinical trial, Logistic Models, Anesthesia, Female, Neurology (clinical), Intraoperative Period, business
Abstract

OBJECTIVE: We examined the incidence of perioperative fever and its relationship to outcome among patients enrolled in the Intraoperative Hypothermia for Aneurysm Surgery Trial. METHODS: One thousand patients with initial World Federation of Neurological Surgeons grades of I to III undergoing clipping of intracranial aneurysms after subarachnoid hemorrhage were randomized to intraoperative normothermia (36 degrees C-37 degrees C) or hypothermia (32.5 degrees C-33.5 degrees C). Fever (> or =38.5 degrees C) and other complications (including infections) occurring between admission and discharge (or death) were recorded. Functional and neuropsychologic outcomes were assessed 3 months postoperatively. The primary outcome variable for the trial was dichotomized Glasgow Outcome Scale (good outcome versus all others). RESULTS: Fever was reported in 41% of patients. In 97% of these, fever occurred in the postoperative period. The median time from surgery to first fever was 3 days. All measures of outcome were worse in patients who developed fever, even in those without infections or who were World Federation of Neurological Surgeons grade I. Logistic regression analyses were performed to adjust for differences in preoperative factors (e.g., age, Fisher grade, initial neurological status). This demonstrated that fever continued to be significantly associated with most outcome measures, even when infection was added to the model. An alternative stepwise model selection process including all fever-related measures from the preoperative and intraoperative period (e.g., hydrocephalus, duration of surgery, intraoperative blood loss) resulted in the loss of significance for dichotomized Glasgow Outcome Scale, but significant associations between fever and several other outcome measures remained. After adding postoperative delayed ischemic neurological deficits to the model, only worsened National Institutes of Health Stroke Scale score, Barthel Activities of Daily Living index, and discharge destination (home versus other) remained independently associated with fever. CONCLUSION: These findings suggest that fever is associated with worsened outcome in surgical subarachnoid hemorrhage patients, although, because the association between fever and the primary outcome measure for the trial is dependent on the covariates used in the analysis (particularly operative events and delayed ischemic neurological deficits), we cannot rule out the possibility that fever is a marker for other events. Only a formal trial of fever treatment or prevention can address this issue.

Published
2009

8. Colour Doppler imaging as an aid to excision of an arteriovenous malformation

Author

Jeffrey V. Rosenfeld, Ethna Phelan, and C Thien

Subjects
medicine.medical_specialty, genetic structures, business.industry, Successful ligation, Arteriovenous malformation, General Medicine, medicine.disease, Neurology, Physiology (medical), cardiovascular system, Colour doppler, medicine, Colour doppler ultrasound, Surgery, Neurology (clinical), Radiology, business
Abstract

Colour Doppler ultrasound was used to localise an arteriovenous malformation (AVM) and its major feeding vessel intraoperatively. The successful ligation and division of this vessel could be confirmed with confidence on colour Doppler ultrasound. The malformation immediately became less turgid and was completely excised. Colour Doppler ultrasound was a valuable adjunct in the localisation and excision of this AVM and has application to AVM surgery in general.

Published
1994

9. Nutritional status in hospital inpatients: implications for nutritional support services

Author

C Thien, E. Burns, D. B. Wood, D. Kelleher, L. Lo, J. Bontoft, and C J. Cleary

Subjects
Adult, Male, Pediatrics, medicine.medical_specialty, Patients, Population, Overweight, Protein-Energy Malnutrition, Internal Medicine, medicine, Humans, education, Support services, Aged, education.field_of_study, Inpatients, Anthropometry, business.industry, Body Weight, Australia, Nutritional status, Middle Aged, medicine.disease, Nutrition Surveys, Obesity, Nutrition Disorders, Malnutrition, Normal weight, Kwashiorkor, Marasmus, Female, medicine.symptom, business
Abstract

In a population of 473 inpatients, a profile of nutritional status from obesity to marasmickwashiokor was observed. Thirty–two per cent of the population were overweight or obese (n = 153), forty–five per cent were of normal weight (n = 211), 8% were at risk of protein–energy malnutrition (n = 39), and 15% (n = 70) had grades of protein–energy malnutrition from marasmus to marasmic–kwashiokor. The implications for improved nutritional support services for hospitalised patients are discussed.

Published
1985

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