Automated Use of Clinical Laboratory Results
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Transcript of Automated Use of Clinical Laboratory Results
Automated Use of Clinical Laboratory Results in Adults
Benjamin Littenberg, MDUniversity of Vermont
andVermont Clinical Decision Support, LLC
Disclosure
I have an equity position in Vermont Clinical Decision Support, LLC, (Vermedx) along with The University of Vermont and other
faculty inventors.
www.Vermedx.com
Agenda
• Two problems in diabetes– Quality of individual care– Public health impact
• A novel strategy for using information
• Clinical and public health impacts
• Economic impact
Problem Characteristics
• Lab results are central to diabetes management– Good consensus on at least some aspects of care
• Keeping track of results is difficult– Doctors love flow sheets – but hate to keep them up!– Patients use many different laboratories
• Interpreting results is difficult– Diabetes is among the most complex problems a primary care
provider faces• Patients get “lost to follow-up”
– No reminder systems• Doctors and nurses care for individual patients
– Nobody has a “population view”
Guidelines• Hemoglobin A1C measures average blood sugar over last 6-8 weeks
– Low: <7.0%; Medium 7-9%; High: >9%– Frequency: 3 months if high or medium; 6 months if low
• LDL-Cholesterol measures “bad cholesterol” and vascular disease risk– Low: <100 mg/dl; Medium: 100-130; High >130– Frequency: 3 months if high; 6 months if medium; 12 months if low
• Creatinine measures current kidney function– High depends on age and sex (and race and size and....)– Frequency: annual
• Urine protein ratio measures risk for future kidney failure– Low: <30; Medium: 30-300; High: >300– Frequency: 12 months if low; never again if high or 2 mediums or if on
certain medications
And that’s just (some) of the lab tests!
Registry Approach
• Integrate data from multiple sources– Multiple laboratories
• Feedback to providers about individual patients with “value-added reports”
• Feedback to patients• Aggregate to population level
It works for infections. Why not diabetes?
Design Criteria
• Low cost per case• Low technology investment at the practice
– With or without electronic medical record
• Little change in practice flow• Little disruption of patient-provider
relationship• Accommodate multiple data sources• High face validity (accuracy)
Vermedx Diabetes Information System (VDIS)
• Automatic reports to providers and patients
• Based on clinical laboratory results
• Daily feeds from clinical labs
• Electronic messages or faxes to providers (doctors, nurses, physician assistants)
• Letters to patients
VDIS Architecture
VDIS Computer
Primary Care
Provider
Patient
ClinicalLab
ClinicalLab
Electronic medical record
or fax
MailSecure Network
Public HealthSurveillance
VDIS Clinical Outreach
• Flow sheet updates after every lab result
• Reminders to providers
• Reminder letters to patients
• Clinical alert letters to patients
• Quarterly population reports to providers
All products based on national guidelines
Flow sheet
• A flow sheet of pertinent labs, with decision support recommendations
– sent to provider whenever a pertinent test is done
– use in the visit to decide what to do
– follow trends– decide when to re-test– remember odd testing
intervals– possible handout for the
patient
Patient Reminder
• Letter from provider with practice address and telephone
– Explains which tests are due and when
– Asks patient to call office to set up testing
– Motivates patients to stay involved
– Reminds them that the practice cares about their long-term health
– Sent 30 days after the test is overdue (grace period)
Provider Reminder
• A reminder to the practice when patient is overdue
– Use this to keep patients from getting lost to follow up
– Sent 30 days after the test is overdue (grace period)
Patient Alert
• Letter from provider alerting patient to abnormal results
– Sent only for high results (A1C>8 or LDL>130)
– Asks patient to call provider’s office to set up further care (if they haven’t already)
Population Report
– Lists provider’s roster of diabetes patients, their most recent result and overdue status
• Makes it easy to find lost or out-of-control patients for quality improvement
– Provides “report card” for the practice, compared to all other providers and the top 10% performance
– Delivered every 3 months by mail
– Confidential – not shared with anyone else!
• VDIS is not recommended as a “Pay for Performance” system
Clinical Impact: The VDIS Trial
• Randomized by practice• Active practices get all 5 products• Control practices get none• 32 months• Outcomes:
– On-time testing– Blood sugar (A1C), Cholesterol– Costs
• Supported by NIH (R01 DK61167)
Participants
• 64 General Internal Medicine or Family Practices
• 128 Primary Care Providers– MD, DO, NP, PA
• 7,412 adults with diabetes confirmed by provider
• 1,006 randomly selected for home survey
1.17
1.39 1.40
1.74
11.
52
2.5
3O
dds
Ra
tio a
nd
95%
CI
A1C Cholesterol Creatinine Urine Protein
Adjusted for baseline testing and clustering n = 7,412On time testing
Other patient outcomes
• No change in– A1C levels– Cholesterol levels– Renal function– Blood pressure– Functional status– Body mass index
• Improvement in self-care (exercise)
Health Care UtilizationOutcome Control Intervention
AdjustedEffect* P
Hospital days/y 1.89 1.18 -1.01 0.047
Emergency room visits/y
0.72 0.55 -0.23 0.020
Primary care visits/y 2.86 2.04 -0.81 0.010
Specialty visits/y 0.23 0.15 -0.08 0.044
Costs $/y $4937 $3202 -$2426 0.033
*Linear regression adjusted for age, sex, marital status, education, health literacy, race, insulin use, comorbidity, hospital, and clustering within practices.
Health Care UtilizationOutcome Control Intervention
AdjustedEffect* P
Hospital days/y 1.89 1.18 -1.01 0.047
Emergency room visits/y
0.72 0.55 -0.23 0.020
Primary care visits/y 2.86 2.04 -0.81 0.010
Specialty visits/y 0.23 0.15 -0.08 0.044
Costs $/y $4937 $3202 -$2426 0.033
*Linear regression adjusted for age, sex, marital status, education, health literacy, race, insulin use, comorbidity, hospital, and clustering within practices.
The VDIS registry with patient outreach saves over $2,400 per patient per year.
Study Conclusions
• A registry-based clinical outreach program in primary care:– is feasible– improves diabetes care– saves money
What about using it for Public Health?
Registries in Public Health
• Inexpensive surveillance data
• Population view
• Analytic uses
• Clinical outreach (sometimes)
Laboratory results fit the bill.
What can a registry do for public health surveillance?
• Current overall status • Outcomes in subgroups
– Age, sex, geography, provider
• Trends over time• Maps• Combination with other data sources
– Census, surveys, hospital discharges, claims
Data for policy, persuasion and programs
80
10
01
20
14
0M
ea
n L
DL
-Ch
ole
ste
rol (
mg
/dl)
0 20 40 60 80 100Percent of Practices
71 practices 7,512 patients 105.8 patients/practice
Cholesterol by Practice
46
81
0A
1C (
%)
A B C D E F G H I J K LHospital Service Area
Blood Sugar Control by Hospital Service Area
6.50
6.75
7.00
7.25
7.50
7.75
Mea
n A
1C
2001 2002 2003 2004 2005 2006 2007
Monthly Averages
Linear Fit
A1C is falling by 0.036% per year (P<0.001)A1C over Time
6.50
6.75
7.00
7.25
7.50
7.75
Mea
n A
1C (
%)
2001 2002 2003 2004 2005 2006 2007
Vermont
New York
VT: -0.068 per year NY: +0.003 per year (P<0.05)Population Trend: A1C over Time
Clinton, NY
Franklin, NYSt. Lawrence, NY
Grafton, NH
CaledoniaChittenden
EssexFranklin
Gra
nd I
sle
Lamoille
Orange
Orleans
Rutland
Washington
Windham
Addison
Ben
ning
ton
Windsor
Red = High (P<0.05)
Blue = Low (P<0.05)
Grey = Non-outlier
White = No data
Glycemic Control by County
Clinton, NY
Franklin, NYSt. Lawrence, NY
Grafton, NH
CaledoniaChittenden
EssexFranklin
Gra
nd I
sle
Lamoille
Orange
Orleans
Rutland
Washington
Windham
Addison
Ben
ning
ton
Windsor
Red = High (P<0.05)
Blue = Low (P<0.05)
Grey = Non-outlier
White = No data
Glycemic Control by County
Current Vermedx RegistriesVermont New York City San Antonio
Started 2002 2006 May 2008
Sponsor Integrated provider group, insurer
Health Department
Health Department
Patients ~3,000 ~600,000 ~210,000?
Scope A1C, lipids, renal A1C only A1C only
Outreach Yes Pilot phase No
Surveillance No Yes Yes
Patient consent Opt-out None None
Benefits of Population-Based Decision Support
• Improved clinical outcomes for patients
• Help with management of chronic illness for physicians
• Cost savings for the health care system
• Improvement in Public Health