Use of CRT in management of Heart Failure

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Communication Systems, Networks and Digital
Signal Processing University of Patras 19 July
2006
CLINICAL TRIALS OF A WLAN PATIENT LOCATION SYSTEM
PRESENTED BY Aoife Deery
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Background

• PRIMA
• Portable Remote Intelligent Monitoring Agent
• Collaborative effort involving
• Funded by Enterprise Ireland, Advanced
  Technologies Research Program.

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Introduction

• Overall aim of PRIMA
• Develop a device designed to monitor vital signs
  and locate patients using standard WLAN
  equipment.
• Software based solutions, fast implementation
  with affordable cost.
• Improves efficiencies in Health Care.

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Introduction

• Aim
• To run a series of clinical trials, wirelessly
  monitoring and actively locating patients and
  equipment in real time.
• Objective
• To access the reliability, repeatibility and
  relivant use of patient location monitoring in
  the clinical sector .

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System Architecture

• Interdependant components
• BAN Hub
• Capture and filter
• Used HTTP tunnelling techniques
• Server
• Linux based machine running on J2EE application
  server called JBOSS.
• Client Application Suite
• Facilitates the management of patients

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System Architecture (cont..)

• Location Awareness
• Supplied by Ekahau
• Works in conjunction with the BAN Hub hardware
• Integrated into a pre-installed WLAN network

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Trials - Overview

• Location software was deployed on a network
  primarily deployed for the wireless monitoring of
  vital signs.
• Some of the trials were preformed side by side
  with the vital signs monitoring of patients.
• BAN-Hub
• Tag 101

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Trials - Overview

• PRIMA was deployed over a 802.11g WLAN
• Network consisted of
• 4 Access Points (APs)
• 1 Server
• 2 Corridors
• 13 Adjoining rooms
• Wards, kitchen, offices, waiting rooms, washrooms
• Restrictions
• Stone walls over half metre thick
• Placement of APs

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Trial Set-Up

• Software integrated in Phase 3 of PRIMA trials.
• Set-Up procedure
• Install map of coverage area
• Scale map
• Calibrate map

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Trials-Methology

• Real-Time Trials
• Select Real Time setting from menu.
• Preformed Using both BAN-HUB and Tag 101
• Walking test, to evaluate if the software follows
  the movement of the device
• Motion sensors activated my walking

• Location Trials
• Select Accurate option from menu.
• Preformed using only Tag 101
• Designed to locate equipment on a random basis.
• Tag carried by doctors and location noted ever
  half hour.
• Send out location information every 2 minutes

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Combined Trials

• Combined both aspects of PRIMA
• Monitoring a patients ECG
• Locating a patient within the coverage area
• Methodology Hide and Seek.
• Evaluate two different things
• Response time of the entire system
• Accuracy of the location software

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Limitations

• Ekahau company recommendations
• Separate Server for positioning management
  software
• Network of APs that ensures the device being
  tracked can be seen by at LEAST 3-5 APs.
• Results in our case had to categorised by areas
  where 1,2,or 3 APs could be seen by the device.

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Analysis of Results

• Real-Time Trials
• On average very accurate
• One problem blind spot
• Location Trials
• On average very successful
• One problem after 1hr absence from coverage
  area, the Tag was not automatically identified
  when it returned to within the network range.

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Analysis of Results

• Patient F from PRIMA trials
• Exact location noted 13/16 times.
• Other 3 times, location is room specific.

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Analysis of Results

• PRIMA Combined Trials
• Time AB response time of system
• Average time 8.5 secs
• Yellow highlight areas that see 3APs.
• Blue highlight areas that see 2APs.

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Recommended Work

• Fit more Access Points so as to increase the
  number of points that the device sees, thus
  improving accuracy.
• Immediate and Inexpensive upgrade.

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Conclusions

• Standard WLAN infrastructure can be used
  effectively for both Real-Time patient monitoring
  and for the accurate location of ambulatory
  patients within a specific coverage area.
• Accuracy depends on the number of APs seen by
  the device being located.
• We would consider the results of your work logic
  area specific
• Healthcare staff welcome change and see benefit
  in computer aided assistance

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Questions