Abstract: 〈 p 〉 〈 strong 〉 List of Abstract Titles and authors: 〈 br / 〉 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 1. Psychosis: A matter of mental effort? 〈 /strong 〉 〈 /p 〉 〈 p 〉 M Borg, Y Y van der Zee, J H Hsieh, H Temmingh, D J Stein, F M Howells 〈 /p 〉 〈 p 〉 〈 strong 〉 2.In search of an affordable, effective post-discharge intervention: A randomised control trial assessing the influence of a telephone-based intervention on readmissions for patients with severe mental illness in a developing country 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 U A Botha, L Koen, M Mazinu, E Jordaan, D J H Niehaus 〈 /p 〉 〈 p 〉 〈 strong 〉 3. The effect of early abstinence from long-term methamphetamine use on brain metabolism using 1H-magnetic resonance spectro-scopy (1H-MRS) 〈 /strong 〉 〈 /p 〉 〈 p 〉 A Burger, S Brooks, D J Stein, F M Howells 〈 /p 〉 〈 p 〉 〈 strong 〉 4. The effect of 〈 em 〉 in utero exposure  〈 /em 〉 to methamphetamine on brain metabolism in childhood using 1H-magnetic resonance spectroscopy (1H-MRS) 〈 /strong 〉 〈 /p 〉 〈 p 〉 A Burger, A Roos, M Kwiatkowski, D J Stein, K A Donald, F M Howells 〈 /p 〉 〈 p 〉 〈 strong 〉 5. A prospective study of clinical, biological and functional aspects of outcome in first-episode psychosis: The EONKCS Study 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 B Chiliza, L Asmal, R Emsley 〈 /p 〉 〈 p 〉 〈 strong 〉 6. Stimulants as cognitive enhancers - perceptions v. evidence in a very real world 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 H M Clark 〈 /p 〉 〈 p 〉 〈 strong 〉 7. Pharmacogenomics in antipsychotic drugs 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 Ilse du Plessis 〈 /p 〉 〈 p 〉 〈 strong 〉 8. Serotonin in anxiety disorders and beyond 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 Ilse du Plessis 〈 /p 〉 〈 p 〉 〈 strong 〉 9. HIV infection results in ventral-striatal reward system hypo-activation during cue processing 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S du Plessis, M Vink, J A Joska, E Koutsilieri, A Bagadia, D J Stein, R Emsley 〈 /p 〉 〈 p 〉 〈 strong 〉 10. Disease progression in schizophrenia: Is the illness or the treatment to blame? 〈 /strong 〉 〈 /p 〉 〈 p 〉 R Emsley, M J Sian 〈 /p 〉 〈 p 〉 〈 strong 〉 11. Serotonin transporter variants play a role in anxiety sensitivity in South African adolescents 〈 /strong 〉 〈 /p 〉 〈 p 〉  S M J Hemmings, L I Martin, L van der Merwe, R Benecke, K Domschke, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 12. Iron deficiency in two children diagnosed with multiple sclerosis: Report on whole exom sequencing 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S Janse van Rensburg, R van Toorn, J F Schoeman, A Peeters, L R Fisher, K Moremi, M J Kotze 〈 /p 〉 〈 p 〉 〈 strong 〉 13. Benzodiazepines: Practical pharmacokinetics 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 P Joubert 〈 /p 〉 〈 p 〉 〈 strong 〉 14. What to consider when prescribing psychotropic medications 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 G Lippi 〈 /p 〉 〈 p 〉 〈 strong 〉 15. Current prescribing practices for obsessive-compulsive disorder in South Africa: Controversies and consensus 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 C Lochner, L Taljaard, D J Stein 〈 /p 〉 〈 p 〉 〈 strong 〉 16. Correlates of emotional and behavioural problems in children with preinatally acquired HIV in Cape Town, South Africa 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 K-A Louw, N Phillips, JIpser, J Hoare 〈 /p 〉 〈 p 〉 〈 strong 〉 17. The role of non-coding RNAs in fear extinction 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S Malan-Muller, L Fairbairn, W M U Daniels, M J S Dashti, E J Oakleley, M Altorfer, J Harvey, S Seedat, J Gamieldien, S M J Hemmings 〈 /p 〉 〈 p 〉 〈 strong 〉 18. An analysis of the management og HIV-mental illness comorbidity at the psychiatric unit of the Dr George Mukhari Academic Hospital 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 M L Maodi, S T Rataemane, T Kyaw 〈 /p 〉 〈 p 〉 〈 strong 〉 19. The identification of novel genes in anxiety disorders: A gene X environment correlation and interaction study 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 N W McGregor, J Dimatelis, S M J Hemmings, C J Kinnear, D J Stein, V Russel, C Lochner 〈 /p 〉 〈 p 〉 〈 strong 〉 20. Collaborations between conventional medicine and traditional healers: Obstacles and possibilities 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 G Nortje, S Seedat, O Gureje 〈 /p 〉 〈 p 〉 〈 strong 〉 21. Thought disorder and form perception: Relationships with symptoms and cognitive function in first-episode schizophrenia 〈 /strong 〉 〈 /p 〉 〈 p 〉 M R Olivier, R Emsley 〈 /p 〉 〈 p 〉 〈 strong 〉 22. Investigating the functional significance of genome-wide variants associated with antipsychotic treatment response 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 E Ovenden, B Drogemoller, L van der Merwe, R Emsley, L Warnich 〈 /p 〉 〈 p 〉 〈 strong 〉 23. The moral and bioethical determinants of "futility" in psychiatry 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 W P Pienaar 〈 /p 〉 〈 p 〉 〈 strong 〉 24. Single voxel proton magnetic resonance spectroscopy (1H-MRS) and volumetry of the amylgdala in social anxiety disorder in the context of early developmental trauma 〈 /strong 〉 〈 /p 〉 〈 p 〉 D Rosenstein, A T Hess, J Zwart, F Ahmed-Leitao, E Meintjies, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 25. Schizoaffective disorder in an acute psychiatric unit: Profile of users and agreement with Operational Criteria (OPCRIT) 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 R R Singh, U Subramaney 〈 /p 〉 〈 p 〉 〈 strong 〉 26. The right to privacy and confidentiality: The ethics of expert diagnosis in the public media and the Oscar Pistorius trial 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 C Smith 〈 /p 〉 〈 p 〉 〈 strong 〉 27. A birth cohort study in South Africa: A psychiatric perspective 〈 /strong 〉 〈 /p 〉 〈 p 〉 D J Stein 〈 /p 〉 〈 p 〉 〈 strong 〉 28. 'Womb Raiders': Women referred for observation in terms of the Criminal Procedures Act (CPA) charged with fetal abduction and murder 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 U Subramaney 〈 /p 〉 〈 p 〉 〈 strong 〉 29. Psycho-pharmacology of sleep wake disorders: An update 〈 /strong 〉 〈 /p 〉 〈 p 〉 R Sykes 〈 /p 〉 〈 p 〉 〈 strong 〉 30. Refugee post-settlement in South Africa: Role of adjustment challenges and family in mental health outcomes 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 L Thela, A Tomita, V Maharaj, M Mhlongo, K Jonathan 〈 /p 〉 〈 p 〉 〈 strong 〉 31. Dstinguishing ADHD symptoms in psychotic disorders: A new insight in the adult ADHD questionnaire 〈 /strong 〉 〈 /p 〉 〈 p 〉 Y van der Zee, M Borg, J H Hsieh, H Temmingh, D J Stein, F M Howells 〈 /p 〉 〈 p 〉 〈 strong 〉 32. Oscar Pistorius ethical dilemmas in a trial by media: Does this include psychiatric evaluation by media? 〈 /strong 〉 〈 /p 〉 〈 p 〉 M Vorster 〈 /p 〉 〈 p 〉 〈 strong 〉 33. Genetic investigation of apetite aggression in South African former young offenders: The involvement of serotonin transporter gene 〈 /strong 〉 〈 /p 〉 〈 p 〉 K Xulu, J Somer, M Hinsberger, R Weierstall, T Elbert, S Seedat, S Hemmings 〈 /p 〉 〈 p 〉 〈 strong 〉 34. Effects of HIV and childhood trauma on brain morphemtry and neurocognitive function 〈 /strong 〉 〈 /p 〉 〈 p 〉 G Spies, F Ahmed-Leitao, C Fennema-Notestine, M Cherner, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 35. Measuring intentional behaviour normative data of a newly developed motor task battery 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S Bakelaar, J Blampain, S Seedat, J van Hoof, Y Delevoye-Turrel 〈 /p 〉 〈 p 〉 〈 strong 〉 36. Resilience in social anxiety disorder and post-traumatic stress disorder in the context of childhood trauma 〈 /strong 〉 〈 /p 〉 〈 p 〉 M Bship, S Bakelaar, D Rosenstein, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 37. The ethical dilemma of seclusion practices in psychiatry 〈 /strong 〉 〈 /p 〉 〈 p 〉 G Chiba, U Subramaney 〈 /p 〉 〈 p 〉 〈 strong 〉 38. Physical activity and neurological soft signs in patients with schizophrenia 〈 /strong 〉 〈 /p 〉 〈 p 〉 O Esan, C Osunbote, I Oladele, S Fakunle, C Ehindero 〈 /p 〉 〈 p 〉 〈 strong 〉 39. A retrospective study of completed suicides in the Nelson Mandela Bay Metropolitan Area from 2008 to 2013 - preliminary results 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 C Grobler, J Strumpher, R Jacobs 〈 /p 〉 〈 p 〉 〈 strong 〉 40. Serotonin transporter variants play a role in anxiety sensitivity in South African adolescents 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S M J Hemmings, L I Martin, L van der Merwe, R Benecke, K Domschke, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 41. Investigation of variants within antipsychotic candidate pharmacogenes associated with treatment outcome 〈 /strong 〉 〈 /p 〉 〈 p 〉 F Higgins, B Drogmoller, G Wright, L van der Merwe, N McGregor, B Chiliza, L Asmal, L Koen, D Niehaus, R Emsley, L Warnich 〈 /p 〉 〈 p 〉 〈 strong 〉 42. Effects of diet, smoking and alcohol consumption on disability (EDSS) in people diagnosed with multiple sclerosis 〈 /strong 〉 〈 /p 〉 〈 p 〉 S Janse van Rensburg, W Davis, D Geiger, F J Cronje, L Whati, M Kidd, M J Kotze 〈 /p 〉 〈 p 〉 〈 strong 〉 43. The clinical utility of neuroimaging in an acute adolescnet psychiatric inpatient population 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 Z Khan, A Lachman, J Harvey 〈 /p 〉 〈 p 〉 〈 strong 〉 44. Relationships between childhood trauma (CT) and premorbid adjustment (PA) in a highly traumatised sample of patients with first-episode schizophrenia (FES 〈 /strong 〉 ) 〈 /p 〉 〈 p 〉 S Kilian, J Burns, S Seedat, L Asmal, B Chiliza, S du Plessis, R Olivier, R Emsley 〈 /p 〉 〈 p 〉 〈 strong 〉 45. Functional and cognitive outcomes using an mTOR inhibitor in an adolescent with TSC 〈 /strong 〉 〈 /p 〉 〈 p 〉 A Lachman, C van der Merwe, P Boyes, P de Vries 〈 /p 〉 〈 p 〉 〈 strong 〉 46. Perceptions about adolescent body image and eating behaviour 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 K Laxton, A B R Janse van Rensburg 〈 /p 〉 〈 p 〉 〈 strong 〉 47. Clinical relevance of FTO rs9939609 as a determinant of cardio-metabolic risk in South African patients with major depressive disorder 〈 /strong 〉 〈 /p 〉 〈 p 〉 H K Luckhoff, M J Kotze 〈 /p 〉 〈 p 〉 〈 strong 〉 48. Childhood abuse and neglect as predictors of deficits in verbal auditory memory in non-clinical adolescents with low anxiety proneness 〈 /strong 〉 〈 /p 〉 〈 p 〉 L Martin, K Martin, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 49. The changes of pro-inflammatory cytokines in a prenatally stressed febrile seizure animal model and whether 〈 em 〉 Rhus chirindensis 〈 /em 〉 may attenuate these changes 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 A Mohamed, M V Mabandla, L Qulu 〈 /p 〉 〈 p 〉 〈 strong 〉 50. Influence of TMPRSS6 A736v and HFE C282y on serum iron parameters and age of onset in patients with multiple sclerosis 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 K E Moremi, M J Kotze, H K Luckhoff, L R Fisher, M Kidd, R van Toorn, S Janse van Rensburg 〈 /p 〉 〈 p 〉 〈 strong 〉 51. Polypharmacy in pregnant women with serious mental illness 〈 /strong 〉 〈 /p 〉 〈 p 〉 E Thomas, E du Toit, L Koen, D Niehaus 〈 /p 〉 〈 p 〉 〈 strong 〉 52. Infant attachment and maternal depression as predictors of neurodevelopmental and behavioural outcomes at follow-up 〈 /strong 〉 〈 /p 〉 〈 p 〉 J Nothling, B Laughton, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 53. Differences in abuse, neglect and exposure to community violence in adolescents with and without PTSD 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 J Nothling, S Suliman, L Martin, C Simmons, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 54. Assessment of oxidative stress markers in children with autistic spectrum disorders in Lagos, Nigeria 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 Y Oshodi, O Ojewunmi, T A Oshodi, T Ijarogbe, O F Aina, J Okpuzor, O C F E A Lesi 〈 /p 〉 〈 p 〉 〈 strong 〉 55. Change in diagnosis and management of 'gender identity disorder' in pre-adolescent children 〈 /strong 〉 〈 /p 〉 〈 p 〉 S Pickstone-Taylor 〈 /p 〉 〈 p 〉 〈 strong 〉 56. Brain network connectivity in women exposed to intimate partner violence 〈 /strong 〉 〈 /p 〉 〈 p 〉 A Roos, J-P Fouche, B Vythilingum, D J Stein 〈 /p 〉 〈 p 〉 〈 strong 〉 57. Prolonged exposure treatment for PTSD in a Third-World, task-shifting, community-based environment 〈 /strong 〉 〈 /p 〉 〈 p 〉 J Rossouw, E Yadin, I Mbanga, T Jacobs, W Rossouw, D Alexander, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 58. Contrasting effects of early0life stress on mitochondrial energy-related proteins in striatum and hippocampus of a rat model of attention-deficit/ hyperactivity disorder 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 V Russell, J Dimatelis, J Womersley, T-L Sterley 〈 /p 〉 〈 p 〉 〈 strong 〉 59. Attention-deficit hyperactivity disorder in adults: A South African perspective 〈 /strong 〉 〈 /p 〉 〈 p 〉 R Schoeman, M de Klerk, M Kidd 〈 /p 〉 〈 p 〉 〈 strong 〉 60. Cognitive function in women with HIV infection and early-life stress 〈 /strong 〉 〈 /p 〉 〈 p 〉 G Spies, C Fennema-Notestine, M Cherner, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 61. Changes in functional connectivity networks in bipolar disorder patients after mindfulness-based cognitic therapy 〈 /strong 〉 〈 /p 〉 〈 p 〉 J A Starke, C F Beckmann, N Horn 〈 /p 〉 〈 p 〉 〈 strong 〉 62. Post-traumatic stress disorder, overweight and obesity: A systematic review and meta-analysis 〈 /strong 〉 〈 /p 〉 〈 p 〉 〈 strong 〉 〈 /strong 〉 S Suliman, L Anthonissen, J Carr, S du Plessis, R Emsley, S M J Hemmings, C Lochner, N McGregor L van den Heuvel, S Seedat 〈 /p 〉 〈 p 〉 〈 strong 〉 63. The brain and behaviour in a third-trimester equivalent animal model of fetal alcohol spectrum disorders 〈 /strong 〉 〈 /p 〉 〈 p 〉 P C Swart, C B Currin, J J Dimatelis, V A Russell 〈 /p 〉 〈 p 〉 〈 strong 〉 64. Irritability Assessment Model (IAM) to monitor irritability in child and adolescent psychiatric disorders. 〈 /strong 〉 〈 /p 〉 〈 p 〉 D van der Westhuizen 〈 /p 〉 〈 p 〉 〈 strong 〉 65. Outcome of parent-adolescent training in chilhood victimisation: Adaptive functioning, psychosocial and physiological variables 〈 /strong 〉 〈 /p 〉 〈 p 〉 D van der Westhuizen 〈 /p 〉 〈 p 〉 〈 strong 〉 66. The effect of ketamine in the Wistar-Kyoto and Sprague Dawley rat models of depression 〈 /strong 〉 〈 /p 〉 〈 p 〉 P J van Zyl, J J Dimatelis, V A Russell 〈 /p 〉 〈 p 〉 〈 strong 〉 67. Investigating COMT variants in anxiety sensitivity in South African adolescents 〈 /strong 〉 〈 /p 〉 〈 p 〉 L J Zass, L Martin, S Seedat, S M J Hemmings 〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉 〈 strong 〉 〈 br / 〉 〈 /strong 〉 〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉 〈 p 〉   〈 /p 〉

Abstract: Effects of annealing ZnO in hydrogen, oxygen, and argon have been investigated using deep level transient spectroscopy (DLTS) and Laplace-DLTS (LDLTS) measurements. Current-voltage (IV) measurements indicate a decrease in zero–bias barrier height for all the annealed samples. Conventional DLTS measurements reveal the presence of three prominent peaks in the un-annealed and annealed samples. A new peak with an activation enthalpy of 0.60 eV has been observed in the H2 annealed samples, while an estimated energy level of 0.67 eV has been observed in Ar annealed samples. O2 annealing does not introduce new peaks but causes a decrease in the concentration of the E3 peak and an increase in concentration of the E1 peak. The concentrations of all the intrinsic defects have decreased after H2 and Ar annealing; with Ar annealing giving peaks with the lowest concentrations. The E2 peak anneals out after annealing ZnO in Ar and H2 at 300 °C. From the annealing behaviour of E3, we have attributed to transition metal ion related defects, while E4 has been explained as a defect, whose formation favours oxygen deficient conditions. Laplace DLTS has successfully been employed to resolve the closely spaced energy levels in the E4 peak, splitting it into three peaks with energy levels, 0.68 eV, 0.58 eV, and 0.50 eV below the minimum of the conduction band for the Ar annealed sample.

Abstract: The purpose of this study was to assess the value of body surface mapping and the standard 12-lead ECG in localizing the site of origin of postinfarction ventricular tachycardia (VT) during endocardial pace mapping of the left ventricle. METHODS AND RESULTS Simultaneous recordings of 62-lead body surface QRS integral maps and scalar 12-lead ECG tracings were obtained in 16 patients with prior myocardial infarction during a total of 26 distinct VT configurations and during subsequent left ventricular catheter pace mapping at 9 to 24 different endocardial sites. Anatomic pacing site locations were computed by means of a biplane cineradiographic method and plotted on a polar projection of the left ventricle. The QRS integral map and the QRS complexes of the 12 standard leads of each VT morphology obtained in a particular patient were compared independently with the different paced QRS integral maps and paced QRS complexes of the 12-lead ECG generated in that same patient. The stimulus site locations of the best matching paced QRS integral map and paced QRS complexes of the 12-lead ECG were indicated on the polar projection and subsequently compared with the endocardial location of the corresponding site of VT origin identified during intraoperative (surgical ablation) or catheter activation sequence mapping (catheter ablation). The localization resolution of pace mapping was established separately for each electrocardiographic technique by computing the size of endocardial areas with similar morphological features of the QRS complex. Pace mapping advocated with body surface mapping or the 12-lead ECG enabled adequate reproduction of the VT QRS morphology in 24 of 26 VTs (92%) and 25 of 26 VTs (96%), respectively. Activation sequence mapping identified the site of origin in 12 of 26 previously observed VT configurations (46%). Ten and 11 VTs were localized by activation sequence mapping and pace mapping combined with body surface mapping or the 12-lead ECG, respectively. Pace mapping applied with body surface mapping identified the site of origin correctly (distance 〈 or = 2 cm) in 8 of 10 compared VTs (80%); an adjacent site (distance between 2 and 4 cm) or a disparate site (distance 〉 or = 4 cm) was identified in the remaining 2 of 10 VTs (20%). Pace mapping used with the 12-lead ECG localized the site of origin correctly in 2 of 11 VTs (18%); the site of origin was identified correctly next to an additional adjacent site in 5 of 11 VTs (55%); and an adjacent site or a disparate site was found in 1 of 11 VTs (9%) and 2 of 11 VTs (18%), respectively. The difference in localization accuracy of both electrocardiographic techniques was statistically significant (P = .02). The mean size of endocardial areas where a comparable QRS morphology was obtained during pace mapping was 6.0 +/- 4.5 cm2 with the application of body surface mapping and 15.1 +/- 12.0 cm2 with the use of the 12-lead ECG. CONCLUSIONS These results demonstrate that application of the 62-lead instead of the 12-lead ECG during endocardial pace mapping enhances the localization resolution of this mapping technique and enables more precise identification of the site of arrhythmogenesis in the majority of compared postinfarction VT episodes.