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AIRLIE Hypertension Study. A utomated I ntervention to R educe L ifestyle I mpact on E merging Hypertension . Principal Investigator Judith McCalla, PhD Co-Investigators Ali Ahmed, MD Shawna Ehlers, PhD Kevin Everett, PhD Paula Rhode, PhD Tracy Riley, PhD, RN. Consultants

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airlie hypertension study

AIRLIEHypertension Study

Automated Intervention to Reduce Lifestyle Impact on Emerging Hypertension

investigative team
Principal Investigator

Judith McCalla, PhD


Ali Ahmed, MD

Shawna Ehlers, PhD

Kevin Everett, PhD

Paula Rhode, PhD

Tracy Riley, PhD, RN


Karina Davidson, PhD

Judy Ockene, PhD

Walter Ambrosius, PhD

Francois Lesperance, MD

Investigative Team
background hypertension htn and pre htn
Background: Hypertension (HTN) and Pre-HTN
  • HTN/high BP: >140/90 mm Hg or current Tx with anti-hypertensives
  • Affects ~50M or 1/4th of all US adults
  • HTN: Independent risk factor for multiple CVD
  • High normal BP: Also independent risk factor
  • Pre-HTN: SBP 120-139/ DBP 80-89 mmHg
  • Significance: Healthy lifestyles could lower progression of pre-HTN to HTN
significance of pre htn
Significance of Pre-HTN
  • Incidence of HTN increases with age
  • New JNC-VII guidelines identify pre-hypertensive category
  • Adoption and maintenance of healthier lifestyle may reduce BP in pre-hypertensive persons and reduce incidence of HTN
modifiable risk factors for htn
Modifiable Risk Factors for HTN
  • Excess body weight
  • Reduced physical activity
  • Excess dietary sodium intake
  • Inadequate intake of fruits, vegetables, and potassium
  • Excess alcohol intake
prevalence of risk factors for htn
Prevalence of Risk Factors for HTN
  • Overweight or obesity alone affects 122 million Americans
  • 80% of Americans live sedentary lives w/o any regular physical activity
  • Over 75% do not consume > 5 servings of fruits and vegetables/day
background literature
Background Literature
  • Lifestyle Modification: Lower BP
    • Weight loss
    • Increased physical activity
    • Decreased alcohol consumption
    • Adherence to DASH (Dietary Approaches to Stop Hypertension
    • E.g., 1600 mg sodium DASH eating plan might be as effective as single drug therapy in lowering BP in some individuals
multiple risk factors
Multiple Risk Factors
  • Risk factors for HTN are often intertwined
  • Combination of multiple lifestyle modifications might be more effective than single lifestyle modification
  • However, multi-factor interventions may be complicated by low adherence
  • Primary Aim
    • Test the efficacy of a patient-centered lifestyle intervention in reducing systolic BP in a sample of pre-hypertensive, overweight adults compared to usual care control at 6-months
  • Secondary Aims
    • Test the efficacy of a lifestyle intervention in reducing the onset of HTN in pre-hypertensive, overweight adults over an 18 month period
    • Reduce weight in lifestyle intervention group compared to usual care control
  • Design – multi-site, parallel 2-arm RCT
  • Population
    • Overweight and slightly obese adults who meet JNC-VII guidelines for pre-hypertension
  • Innovation
    • Multi-factor behavioral intervention
    • Telephone expert system
    • Patient-centered
inclusion criteria
Inclusion Criteria
  • BMI: 25-35 Kg/m2
  • BP: 120-139/80-89 mmHg
  • 18-70 years of age
  • English/Spanish Speaking
exclusion criteria
Exclusion Criteria
  • Hx of HTN
  • CV diagnosis/event
  • severe psychiatric illness including MDD
  • Neuro-cognitive impairment
  • Pregnant/potential pregnancy
  • Alcohol/Drug dependency
  • Concurrent medications significantly impacting BP or experimental meds
study protocol
Study Protocol
  • Recruitment
    • mass mailing
    • media announcements
    • community-based events
  • Prescreening
    • Prescreened for BP and BMI
    • Fact sheet provided
    • Scheduled for clinic screening
study protocol14
Study Protocol
  • Screening
    • Informed consent
    • Baseline Measures
      • Clinic BP
      • BMI/Body Fat Index
      • Waist Circumference
      • Co-morbidity Index
study protocol15
Study Protocol
  • Baseline Measures, continued
    • Lifestyle Inventory
      • Block Food Frequency Questionnaire
      • International Physical Activity Questionnaire
      • Alcohol Consumption (> 14 drinks per week)
      • Smoking Status (salivary cotinine)
    • Psychosocial Measures
      • Prime MD
      • SF-36
      • BDI
  • Enrollment and Randomization
    • One week post screen
    • Off-site blocked randomization
    • Computer stratified randomization
      • Clinic
      • Race
follow up assessment
Follow-up Assessment
  • Follow up
    • 3 months abbreviated assessment
      • Only BP, weight, body fat analysis
    • 6, 12, 18 month repeated assessment of baseline measures
experimental and control groups
Experimental and Control Groups
  • Usual Care Group Overview
    • One time meeting with behavioral coach
    • Review pamphlet regarding risk factors and encourage participant to follow it
    • Give refrigerator magnet as a reminder of the study
    • Tell participant of upcoming assessments
experimental and control groups19
Experimental and Control Groups
  • Lifestyle Intervention Group Overview
    • Interactive Telephone Expert System
    • Patient-centered
    • Multi-factor behavioral
experimental and control groups20
Experimental and Control Groups
  • Lifestyle Intervention Group Overview
    • Initial meeting with behavioral coach
      • Discuss health assessment results
      • Assist in selecting 3 components to work on either simultaneously or sequentially for next 6 months
      • Introduce Interactive Telephone Expert System
      • Remind participant of upcoming assessments
      • Give refrigerator magnet as a reminder of the study
design patient centered lifestyle intervention
Design – Patient-CenteredLifestyle Intervention
  • Health Risk Assessment
  • Recommended Components
    • Physical Activity
    • Low Sodium Diet
    • DASH Diet (↑ fruits & veggies; ↓ fat & calories)
    • Stop Smoking
    • Reduce Alcohol Consumption
    • Stress Management
  • Participant Selection of 3 Components
staff training
Staff Training
  • Training
    • Expert Consultation Workshop at Airlie for all study related staff/investigators/site coordinators
    • Recruitment, consent, enrollment protocol
    • Data Collection
      • Blood pressure, waist circumference: Inter-rater reliability > .80
      • Database management
staff training24
Staff Training
  • Manuals
    • Behavioral Coach
    • Participants
    • Data Collectors
    • Site Coordinators/Staff
    • Procedure
design data collection and quality control
Design – Data Collection and Quality Control
  • Subject casebooks
  • Random checks of procedure completeness
    • Forms
    • Depression symptom monitoring
    • Follow-up of patients who haven’t accessed system > 1 week
  • Monthly site meetings
  • Quarterly inter-rater reliability site checks
  • Quarterly PI meetings
  • Annual and study end reports
data analysis
Data Analysis
  • Power Analysis
    • N= 852/ group
    • 90% Power
    • Assumptions
      • 2-sided test at the 5% level
      • Difference of 1.7mmHg (PREMIER, 2003)
      • SD of 9.7mmHg (PREMIER, 2003)
      • 20% attrition
data analysis27
Data Analysis
  • Primary Analysis
    • Mixed Model, adjust for baseline, unstructured covariance
  • Secondary Analysis 1
    • Generalized Estimating Equation, unstructured correlation
  • Secondary Analysis 2
    • Mixed Model, adjust for baseline, unstructured, time X treatment interaction
  • Clinical sites
  • Data Coordinating Center
    • University of Miami
  • DSMB Criteria and Development
    • Adverse event reporting guidelines
    • Termination policies
airlie hypertension study30

AIRLIEHypertension Study

Automated Intervention to Reduce Lifestyle Impact on Emerging Hypertension