Wireless Clinical Scale!
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1 Wireless Clinical Scale! Chenyang Lu! Cyber-Physical Systems Laboratory! Department of Computer Science and Engineering!
2 Motivation!! Clinical deterioration in hospitalized patients! " 4-17% suffer adverse events (e.g., cardiac or respiratory arrest).! " Up to 70% of such events could have been prevented.! " Clinical deterioration is often preceded by changes in vitals.!!! Goal: early warning of clinical deterioration # improved outcome!! Require real-time patient monitoring in general hospital wards! " Current practice: collect vital signs manually! " Approach: wireless monitoring system collects data in real-time!! Large-scale, interdisciplinary research! " Wireless sensor networks, data mining, medical informatics, clinical care! 1"
3 Two-Tier Clinical Warning! 1. Predict high-risk patients based on electronic medical records!! " Clinical data mining [Journal of Hospital Medicine 2013]! 2. Detect events using real-time vital signs! +" " Wireless monitoring [SenSys 2010, Wireless Health 2012]! " Event detection algorithms [KDD 2012]! 2
4 Two-Tier Clinical Warning! 1. Predict high-risk patients based on electronic medical records!! " Clinical data mining [Journal of Hospital Medicine 2013]! 2. Detect events using real-time vital signs! +" " Wireless monitoring [SenSys 2010, Wireless Health 2012]! " Event detection algorithms [KDD 2012]! 3
5 Wireless Clinical Monitoring! 1. Build a clinical monitoring system with sensor networks.! 2. Clinical trial 1: feasibility! " Deployed in a general hospital ward for 7 months.! " Enrolled 46 patients.! 3. Clinical trial 2: scaling up! " Deployed in 7 general hospital wards for 14 months! " Enrolled 97 patients! " Large wireless sensor networks spanning 4 floors! " Integrated with electronic medical records and hospital IT! 4
6 Wireless Clinical Monitoring! 1. Build a clinical monitoring system with sensor networks.! 2. Clinical trial 1: feasibility! " Deployed in a general hospital ward for 7 months.! " Enrolled 46 patients.! 3. Clinical trial 2: scaling up! " Deployed in 7 general hospital wards for 14 months! " Enrolled 97 patients! " Large wireless sensor networks spanning 4 floors! " Integrated with electronic medical records and hospital IT! 5
7 Wireless Sensor Networks vs. Wi-Fi!! More energy efficient than Wi-Fi at low data rate! " Common vital signs have low data rate.! " Nurses are too busy to change batteries!!!! Low deployment cost! " Mesh networks without wired infrastructure.! " Ease adoption.! " Even major hospitals may not guarantee full Wi-Fi coverage.!! Sufficient reliability! " >99% median network reliability in our clinical trial.! " Even a wired network can improve reliability only marginally.!! 6"
8 System Architecture!! Base station: laptop connected to Wi-Fi!! Relays: motes plugged into wall outlets! Redundant deployment # coverage, fault tolerance!! Patient node! Pulse oximeter + processor + radio! Battery operated! 7"
9 Reliable Network Architecture! Problem: Patients in general hospital units are ambulatory.! Approach: Two-tier architecture for end-to-end data delivery.! 1 Dynamic Relay Association Protocol (DRAP): Patient # 1 st relay! " Patient node dynamically discovers and associates with a relay.! " Single-hop protocol handles patient mobility.! " Simplifies power management in patient nodes (send only).! 2 Stationary relay network: 1 st relay # # base station! " Reuse well tested mesh routing protocol: CTP.! " Isolated from patient mobility.! " Wall-plugged => no need to worry about energy.!! 8"
10 Clinical Deployment!! Step-down cardiac care unit! 16 patient rooms, 1200 m 2!! Network! 18 relays: redundant network! Longest path: 3-4 hops! Channel 26 of IEEE ! 1-2 pulse and oxygenation values per minute.!! 46 patients enrolled! >41 days of monitoring! 2-68 hours per patient! Up to 3 patients at a time! 5 patients excluded from analysis! 9"
11 Potential for Detecting Clinical Events! #$%& #$%&!"!" Pulmonary"edema" Sleep"apnea" #$%&!" Bradycardia" 10
12 System Reliability!! Network reliability >95% for all patients.! " DRAP+CTP is effective!!! Median sensing reliability > 80%.! " But 29% of patients had sensing reliability < 50%.!! System reliability dominated by sensing reliability!! 11"
13 Surprises!! Sensing is the problem, not the network!! " System failures are dominated by the sensors.!! Must minimize manual intervention - nurses are busy!! " Change batteries! " Sensor disconnection alarms! " False alarms in event detection!! Wi-Fi is not dependable in hospitals!! " Value-added service with no guarantee of coverage or reliability! " Wi-Fi was the weakest link in our deployment!! 12
14 Summary: Trial 1!! Wireless clinical monitoring system for hospitalized patients.!! First deployment of wireless sensor networks in a hospital ward.!! Clinical trial with patients in a hospital ward.! Highly reliable network! System reliability dominated by pulse oximeter sensors! Potential for detecting clinical deterioration!! O."Chipara,"C."Lu,"T.C."Bailey"and"G.AC."Roman,"Reliable"Clinical"Monitoring"using"Wireless" Sensor"Networks:"Experience"in"a"StepAdown"Hospital"Unit,"ACM"Conference"on"Embedded" Networked"Sensor"Systems"(SenSys'10),"November"2010." 13"
15 Wireless Clinical Monitoring! 1. Build a clinical monitoring system with sensor networks.! 2. Clinical trial 1: feasibility! " Deployed in a general hospital ward for 7 months.! " Enrolled 46 patients.! 3. Clinical trial 2: scaling up! " Deployed in 7 general hospital wards for 14 months! " Enrolled 97 patients! " Large wireless sensor networks spanning 4 floors! " Integrated with electronic medical records and hospital IT! 14
16 Overview: Trial 2!! Large scale: multiple wireless sensor networks.! " Monitored patients in 4 hospital floors and 7 wards! " Can wireless clinical monitoring scale to a large hospital?!! End-to-end: integrate with hospital IT infrastructure.! " Can wireless sensor networks work with enterprise IT infrastructure?! 15
17 Relays Network Infrastructure! 16
18 Network Scale!! On April 11: BS 50 and 52 and 11 relays were deployed!! Bumped to 30 relays when the network did not perform! Too Base many station relays 22 turned disappeared relay disconnected OFF Unit added on the floor above! Integrating multiple networks + 3D topology saved the day!! 17
19 Wireless in a Hospital!! Wireless in large and busy buildings is complex and unpredictable.! " Base station in a same ward was hard to reach.! " Vertical links were highly effective and instrumental for reliability.!! Hence we need as much route diversity as possible!! 18"
20 Integrate or Isolate Networks?!! Integrating multiple wireless sensor networks saved the trial!! " Relay networks used an anycast protocol (CTP).! " Sensor data may be routed to any existing base station.! " Integration of multiple networks greatly improved route diversity.! %Conected Relay#! This would not have happened if we had! " isolated the networks in different wards (on different channels) or! " used a unicast routing protocol.! 19"
21 Impact of IT procedures!! It is not just a standalone sensor network!! " Data security and privacy is a chief concern! " User-grade equipment # almost daily OS and security patches! " Laptops # full disk encryption!! Recommendations! " Do not transport identifying information! " Use server-class hardware and software for continuous operation! 20
22 Human Factors!! Can sensor networks survive in a hospital?! " Mote disappearing! " Base stations disconnections! " Web surfing!! Recommendations! " Equipment should look medical grade! " Installed in appropriate places! " Label everything! " Disconnection alarm! 21"
23 Summary: Trial 2!! Wireless clinical monitoring can scale up and work with hospital IT infrastructure!!! Lessons learned! " Integrate, don t partition, your subnetworks! Use multiple base stations to enhance route diversity! Integrate networks across wards and floors # higher reliability! " It is not just a wireless sensor network alone!! Consider IT procedures in the hospital! " Deal with human factors! R."Dor,"G."Hackmann,"Z."Yang,"C."Lu,"Y."Chen,"M."Kollef"and"T.C."Bailey,"Experiences"with"an"EndA ToAEnd"Wireless"Clinical"Monitoring"System,"Conference"on"Wireless"Health"(WH'12),"2012."" 22
24 Looking ahead!! Close the loop! " End-to-end clinical warning! " Clinical decision support and intervention!! Go beyond hospitals! " Continuously health monitor in everyday life! " Integration with mobile phones and Cloud! " Scale to population across a city, a country, and the Globe! 23"
25 Acknowledgement!! Computer Science: Yixin Chen, Gruia-Catalin Roman!! PhD students: Octav Chipara, Rahav Dor, Greg Hackmann!! School of Medicine: Thomas Bailey, Marin Kollef!! Barnes and Jewish Hospital: Physicians, Nursing and IT staff!! NIH National Center For Research Resources!! Barnes-Jewish Hospital Foundation!! National Science Foundation!! 24
26 Readings!! Wireless clinical monitoring! " O. Chipara, C. Lu, T.C. Bailey and G.-C. Roman, Reliable Clinical Monitoring using Wireless Sensor Networks: Experience in a Step-down Hospital Unit, ACM Conference on Embedded Networked Sensor Systems (SenSys'10), November 2010.! " R. Dor, G. Hackmann, Z. Yang, C. Lu, Y. Chen, M. Kollef and T.C. Bailey, Experiences with an End-To-End Wireless Clinical Monitoring System, Conference on Wireless Health (WH'12), October 2012.!! Overview! " G. Hackmann, M. Chen, O. Chipara, C. Lu, Y. Chen, M. Kollef and T.C. Bailey, Toward a Two-Tier Clinical Warning System for Hospitalized Patients, American Medical Informatics Association Annual Symposium (AMIA'11), October 2011.!! Clinical Trial! " T. Bailey, Y. Chen, Y. Mao, C. Lu, G. Hackmann, S.T. Micek, K. Heard, K. Faulkner and M.H. Kollef, A Trial of a Real-Time Alert for Clinical Deterioration in Patients Hospitalized on General Medical Wards, Journal of Hospital Medicine, 8(5): , May 2013.!! Data Mining! " Y. Mao, W. Chen, Y. Chen, C. Lu, M. Kollef and T.C. Bailey, An Integrated Data Mining Approach to Real-time Clinical Monitoring and Deterioration Warning, ACM SIGKDD International Conference on Knowledge Discovery and Data Mining (KDD'12), August 2012.! " Y. Mao, Y. Chen, G. Hackmann, M. Chen, C. Lu, M. Kollef and T.C. Bailey, Early Deterioration Warning for Hospitalized Patients by Mining Clinical Data, International Journal of Knowledge Discovery in Bioinformatics, 2(3):1-20, 2012.!! Wireless Clinical Warning Project: Cyber-Physical Systems Laboratory: Chenyang Lu: 25"
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