Research Topics
| Logan VossSummaryCountry: New Zealand Publications
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Publications
Effects of prior hypoxia exposure, endotoxin and sleep state on arousal ability to airway obstruction in piglets: implications for sudden infant death syndromeL J Voss
Department of Physiology, University of Otago Medical School, Dunedin, New Zealand
Biol Neonate 88:145-55. 2005..Respiratory tract infections may be an important component in many deaths attributed to sudden infant death syndrome (SIDS), although the mechanism of involvement remains unclear...- Endotoxin effects on markers of autonomic nervous system function in the piglet: implications for SIDSL J Voss
Department of Physiology, University of Otago Medical School, Dunedin, New Zealand
Biol Neonate 86:39-47. 2004..These findings are consistent with known risk factors for sudden infant death syndrome... 
Stability of brain neocortical slice seizure-like activity during low-magnesium exposure: Measurement and effect of artificial cerebrospinal fluid temperatureLogan J Voss
Department of Anesthesiology, Waikato Clinical School, University of Auckland, New Zealand
J Neurosci Methods 192:214-8. 2010....- Role of Cx36 gap junction modulation in general anaesthetic anticonvulsant actionLogan J Voss
Department of Anesthesiology, Waikato Clinical School, University of Auckland, New Zealand
Eur J Pharmacol 643:58-62. 2010..The role of gap junction modulation by etomidate is more complicated and may be important in the mechanism of action of etomidate's proconvulsant effects... - Excitatory effects of gap junction blockers on cerebral cortex seizure-like activity in rats and miceLogan J Voss
Department of Anesthesiology, Waikato Clinical School, University of Auckland, Waikato Hospital, New Zealand
Epilepsia 50:1971-8. 2009..The cerebral cortex is underrepresented in this body of research. We have investigated the effect of gap junction blockade on seizure-like activity in rat and mouse cerebral cortex slices... - Aconitine induces prolonged seizure-like events in rat neocortical brain slicesLogan J Voss
Department of Anaesthesia, Waikato Hospital, Hamilton, New Zealand
Eur J Pharmacol 584:291-6. 2008..The latter is effected by calcium-dependent mechanisms, in keeping with known effects of aconitine on hippocampal slices. Both sodium and NMDA channels are involved in mediating the calcium-dependent aconitine effects... - Monitoring consciousness: the current status of EEG-based depth of anaesthesia monitorsLogan Voss
Department of Anaesthesia, Waikato Clinical School, University of Auckland, Hamilton, New Zealand
Best Pract Res Clin Anaesthesiol 21:313-25. 2007..g. an awake-looking EEG, but an unresponsive patient; or a slow-wave EEG in an awake patient). Fortunately, a slow-wave EEG (even in the presence of a responsive patient) usually indicates profound amnesia for explicit memory... - A comparison of pharmacokinetic/pharmacodynamic versus mass-balance measurement of brain concentrations of intravenous anesthetics in sheepLogan J Voss
Department of Anaesthesia and Intensive Care, University of Adelaide and Royal Adelaide Hospital, North Terrace, Adelaide University, Adelaide, South Australia, Australia
Anesth Analg 104:1440-6, table of contents. 2007.... - Cerebral cortical effects of desflurane in sheep: comparison with isoflurane, sevoflurane and enfluraneL J Voss
Waikato Clinical School, University of Auckland, Hamilton, New Zealand
Acta Anaesthesiol Scand 50:313-9. 2006..In this study, we investigated the propensity of desflurane to induce cortical spikes and made a direct objective comparison with enflurane, isoflurane, and sevoflurane. The ECoG effects of desflurane have not been previously reported... - Changes in frequency of seizure-like events in stimulated cortical slicesJonathan Mason
Waikato University, Hamilton, New Zealand
Conf Proc IEEE Eng Med Biol Soc 2010:2041-4. 2010..5 microA). Differently from previously thought, this change in frequency is however not accompanied by any alteration of the tissue permittivity or conductivity during the inter-seizure interval... 
The electrocortical effects of enflurane: experiment and theoryJames W Sleigh
Department of Anaesthesiology, Waikato Clinical School, University of Auckland, Auckland, New Zealand
Anesth Analg 109:1253-62. 2009..In this study, we compared a theoretical computer model of this activity with real local field potential (LFP) data obtained from anesthetized rats...- The effect of skin incision on the electroencephalogram during general anesthesia maintained with propofol or desfluraneJames W Sleigh
Department of Anesthesia, Waikato Clinical School of the University of Auckland, Waikato Hospital, Hamilton, 3206, New Zealand
J Clin Monit Comput 24:307-18. 2010..What are the patterns commonly seen during routine clinical anesthesia?.. - ADHD-like hyperactivity, with no attention deficit, in adult rats after repeated hypoxia during the equivalent of extreme prematurityDorothy E Oorschot
Department of Anatomy and Structural Biology, University of Otago, P O Box 913, Dunedin, New Zealand
J Neurosci Methods 166:315-22. 2007..These findings provide a new animal model to investigate the biological mechanisms and treatment of ADHD-like hyperactivity due to repeated hypoxia during the equivalent of extreme prematurity... - Differential anaesthetic effects following microinjection of thiopentone and propofol into the pons of adult rats: a pilot studyL J Voss
Department of Anaesthesiology, University of Auckland, New Zealand
Anaesth Intensive Care 33:373-80. 2005..In summary, propofol and thiopentone have different effects when microinjected into the MPTA. While both agents reduced reflex withdrawal to a nociceptive stimulus, only thiopentone induced an "anaesthesia-like" state... - Episodic waveforms in the electroencephalogram during general anaesthesia: a study of patterns of response to noxious stimuliE C MacKay
Department of Anaesthesia, Waikato Hospital, Hamilton, New Zealand
Anaesth Intensive Care 38:102-12. 2010..002). It is possible to quantify such episodic EEG patterns during general anaesthesia and in this study noxious stimulation tended to reduce the prevalence of these patterns... - Can anaesthetists be taught to interpret the effects of general anaesthesia on the electroencephalogram? Comparison of performance with the BIS and spectral entropyJ P Barnard
Department of Anaesthesia, Waikato Hospital, Hamilton, New Zealand
Br J Anaesth 99:532-7. 2007..There are, however, clear changes in the EEG caused by GABA-ergic anaesthetic agents. The anaesthetized EEG still looks like a random waveform, but clearly a different random waveform from that seen when conscious... - The howling cortex: seizures and general anesthetic drugsLogan J Voss
Department of Anesthesia, Waikato Clinical School, Waikato Hospital, Pembroke St, Hamilton, New Zealand
Anesth Analg 107:1689-703. 2008..Seizures may falsely elevate electroencephalogram indices of depth of anesthesia... - Using permutation entropy to measure the electroencephalographic effects of sevofluraneXiaoli Li
Department of Automation, Institute of Electrical Engineering, Yanshan University, Qinhuangdao, Hebei 066004, China
Anesthesiology 109:448-56. 2008..In this study, the AE and PE were applied to electroencephalographic recordings for revealing the effect of sevoflurane on brain activity. The dose-response relation of PE during sevoflurane anesthesia was compared with that of AE... - Measure of the electroencephalographic effects of sevoflurane using recurrence dynamicsXiaoli Li
Cercia, School of Computer Science, The University of Birmingham, Birmingham B15 2TT, UK
Neurosci Lett 424:47-50. 2007..A test sample of nine patients shows the recurrence in EEG data may track the effect of the sevoflurane on the brain... - Pharmacokinetic-pharmacodynamic modeling the hypnotic effect of sevoflurane using the spectral entropy of the electroencephalogramIan D H McKay
Department of Anaesthesia, Waikato Hospital, New Zealand
Anesth Analg 102:91-7. 2006..Spectral entropy decreases with increasing sevoflurane concentrations up to 3%. The steepness of the dose-response curve varies between phases of increasing and decreasing anesthetic concentrations...