P57 An innovative approach to workplace based didactic teaching in neurosurgery: initial experience

Objectives

To increase the amount and quality of didactic teaching by commissioning an in-house Diploma course using distance-learning methodologies to supplement regular departmental teaching sessions.

Design

Web-based course consisting of 9 modules covering the breadth of neurosurgical topics. A Diploma was conferred by the Head of Service upon successful completion of all modules.

Subjects

To date, eleven learners (junior doctors at F1/F2/SHO level) have started the Diploma, including doctors from outside our department.

Methods

Learners download a module, dedicate a period of self-study and then discuss the module with their Tutor. To complete a module, a learner would be expected to demonstrate to the Tutor that their knowledge was at ST2 standard as described in the neurosurgical curriculum. Assessment of modules was documented on learners’ existing portfolios.

Results

By way of feedback, all learners (100%) strongly agreed that the Diploma was useful for their day to day job, that it helped understand management of acute neurosurgical problems, that it was interesting, that they would recommend it to a friend/colleague and that support received from the Course Tutor was helpful.

Conclusions

Learners reportedly enjoyed the self-directed, flexible aspect of the Diploma and found that it promoted interactive discussions with registrars and consultants. Feedback obtained externally through HEE and GMC was highly praiseworthy of the Diploma. We intend to continue to offer this course.

Lawsonella clevelandensis causing spinal subdural empyema

Lawsonella clevelandensis is a recently described species and genus of bacterium in the Corynebacterineae suborder which is Gram-stain positive, partially acid-fast and anaerobic. Very few cases of human infection due to this organism are described and here we seek to add to the limited medical literature. We report the case of a 2-year-old girl who presented with an infected spinal dermoid cyst secondary to Lawsonella clevelandensis which required surgical drainage and a long course of antibiotics. We encountered diagnostic and therapeutic difficulties because this is a fastidious organism which was difficult to culture and ultimately required molecular detection and identification. To the best of our knowledge, this is only the seventh reported case of Lawsonella clevelandensis causing human infection worldwide and the first in the UK. This is the first reported case of Lawsonella clevelandensis infection in a child and the second reported case of this organism causing spinal infection.

Correlation of carotid atheromatous plaque inflammation with biomechanical stress: Utility of USPIO enhanced MR imaging and finite element analysis

OBJECTIVE

The aim of this study was to explore whether there is a relationship between the degree of MR-defined inflammation using ultra small super-paramagnetic iron oxide (USPIO) particles, and biomechanical stress using finite element analysis (FEA) techniques, in carotid atheromatous plaques.

METHODS AND RESULTS

18 patients with angiographically proven carotid stenoses underwent multi-sequence MR imaging before and 36 h after USPIO infusion. T(2)(*) weighted images were manually segmented into quadrants and the signal change in each quadrant normalised to adjacent muscle was calculated after USPIO administration. Plaque geometry was obtained from the rest of the multi-sequence dataset and used within a FEA model to predict maximal stress concentration within each slice. Subsequently, a new statistical model was developed to explicitly investigate the form of the relationship between biomechanical stress and signal change. The Spearman's rank correlation coefficient for USPIO enhanced signal change and maximal biomechanical stress was -0.60 (p=0.009).

CONCLUSIONS

There is an association between biomechanical stress and USPIO enhanced MR-defined inflammation within carotid atheroma, both known risk factors for plaque vulnerability. This underlines the complex interaction between physiological processes and biomechanical mechanisms in the development of carotid atheroma. However, this is preliminary data that will need validation in a larger cohort of patients.

Comparison of the inflammatory burden of truly asymptomatic carotid atheroma with atherosclerotic plaques in patients with asymptomatic carotid stenosis undergoing coronary artery bypass grafting: an ultrasmall superparamagnetic iron oxide enhanced magnetic resonance study

INTRODUCTION

Inflammation is a recognized risk factor for the vulnerable atherosclerotic plaque. The aim of this study was to explore whether there is a difference in the degree of Magnetic Resonance (MR) defined inflammation using Ultra Small Super-Paramagnetic Iron Oxide (USPIO) particles, within carotid atheroma in completely asymptomatic individuals and the asymptomatic carotid stenosis in a cohort of patients undergoing coronary artery bypass grafting (CABG).

METHODS

10 patients awaiting CABG with asymptomatic carotid disease and 10 completely asymptomatic individuals with no documented coronary artery disease underwent multi-sequence MR imaging before and 36 hours post USPIO infusion. Images were manually segmented into quadrants and signal change in each quadrant, normalised to adjacent muscle signal, was calculated following USPIO administration.

RESULTS

The mean percentage of quadrants showing signal loss was 94% in the CABG group, compared to 24% in the completely asymptomatic individuals (p<0.001). The carotid plaques from the CABG patients showed a significant mean signal intensity decrease of 16.4% after USPIO infusion (95% CI 10.6% to 22.2%; p<0.001). The truly asymptomatic plaques showed a mean signal intensity increase (i.e. enhancement) after USPIO infusion of 8.4% (95% CI 2.6% to 14.2%; p=0.007). The mean signal difference between the two groups was 24.9% (95% CI 16.7% to 33.0%; p<0.001).

CONCLUSIONS

These findings are consistent with the hypothesis that inflammatory atheroma is a systemic disease. The carotid territory is more likely to take up USPIO if another vascular territory is symptomatic.