validation of heart failure events in allhat participants assigned to doxazosin and chlorthalidone
DESCRIPTION
ALLHAT. Validation of Heart Failure Events in ALLHAT Participants Assigned to Doxazosin and Chlorthalidone. L.B.Piller, B.R.Davis, J.A.Cutler, W.C.Cushman, J.T. Wright, J.D.Williamson, F.H.Leenen, O.Randall, J.S.Golden The University of Texas School of Public Health Houston, Texas. ALLHAT. - PowerPoint PPT PresentationTRANSCRIPT
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Validation of Heart Failure Events in ALLHAT
Participants Assigned to Doxazosin and Chlorthalidone
L.B.Piller, B.R.Davis, J.A.Cutler, W.C.Cushman, J.T. Wright,
J.D.Williamson, F.H.Leenen, O.Randall, J.S.Golden
The University of Texas School of Public Health Houston, Texas
ALLHAT
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At IssueALLHAT
The doxazosin group showed a doubling of risk of CHF compared to the chlorthalidone group (RR, 2.04; 95% CI, 1.79-2.32).
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Objectives
• To describe the process by which the clinical reports of heart failure events were validated
• To describe the statistical analyses which led to the cessation of the doxazosin arm
ALLHAT
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0.00
0.02
0.04
0.06
0.08
0.10
0 1 2 3 4
Cu
mu
lati
ve E
ven
t R
ate
Years of Follow-up
doxazosinchlorthalidone
Congestive Heart Failure
C: 15,256D: 9,061
13,644 7,845
9,541 5,457
5,5313,089
2,4271,351
9,541 5,457
9,541 5,457
Rel Risk 2.04
p < 0.001
95% CL1.79-2.32
0 1 2 3 4
0
0.02
0.04
0.06
0.08
0.10
ALLHAT
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Relative Risks and 95% CICongestive Heart Failure Doxazosin/Chlorthalidone
0.000.501.001.502.002.503.003.504.004.50
High 2.32 2.53 2.41 2.81 2.40 4.14 3.21 2.62 3.97 2.59 2.37
Low 1.79 1.51 1.78 1.47 1.58 1.11 1.67 1.49 0.85 1.76 1.67
RR 2.04 1.96 2.07 2.04 1.94 2.15 2.32 1.98 1.84 2.14 1.98
TotalAge <65
Age 65+
BNH Men
WNH Men
Hisp Men
BNH W
WNH W
Hisp W
DiabNondi
a
ALLHAT
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Methods• Comparison of baseline characteristics of CHF and non-
CHF participants • Comparison of pre and post-event medical management • Endpoints Subcommittee evaluation of a sample of
hospitalized and fatal heart failure cases using study criteria
• Determination and comparison of frequency and severity of systolic dysfunction through ascertainment of ejection fractions (EF)
• Comparison of case-fatality rates and causes of death• Evaluate more stringent CHF-defined outcome
ALLHAT
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Baseline Characteristics
• Do baseline characteristics differ in expected ways between participants with and without CHF, and are these differences generally similar in the doxazosin and chlorthalidone arms?
ALLHAT
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Baseline Characteristics:CHF vs. Non-CHF Participants
Without CHF With CHF
C D C D
No. randomized 14848 8576 420 491
Mean age, yrs. 67 67 71 71
White Non-Hispanic 47% 46% 62% 59%
Black Non-Hispanic 32% 33% 31% 34%
Hispanic 16% 17% 4% 5%
Women 47% 47% 41% 41%
ALLHAT
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Baseline Characteristics:CHF vs. Non-CHF Participants
ALLHAT
Without CHF Any CHF
C D C D
Current smoker, % 22 22 17 19
Antihypertensive RX
Treated >2 mos, % 87 87 90 92
Treated <2 mos, % 3 3 4 2
Untreated,% 10 10 7 6
BP, mm Hg, mean 146/84 146/84 148/81 149/82
LVH by ECG, % 16 16 20 20
LVH by Echo, % 4 4 5 3
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Eligibility Criteria: CHF vs. Non-CHF Participants
Without CHF With CHF
C D C D
Old MI or stroke, % 23 22 38 34
CABG/Angioplasty, % 13 12 24 21
Other ASCVD, % 23 25 33 29
Diabetes, % 36 35 46 46
Low HDL, % 12 12 13 14
LVH by ECG, % 16 16 20 22
LVH by echo, % 5 5 5 4
ST depression/T wave abn., % 10 10 13 12
Current smoker, % 22 22 18 18
ALLHAT
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Pre and Post-Event Treatment of Heart Failure Participants
• Was pre-heart failure event step 1 treatment compliance equivalent in the chlorthalidone and doxazosin groups?
• Were the heart failure participants in the chlorthalidone and doxazosin groups managed similarly following the heart failure events?
ALLHAT
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Pre-Event Treatment ofHospitalized CHF Participants
Pre-Event Medication
Chlorthalidone Group (n=283)
Doxazosin Group (n=311)
Step 1 67% 86%
Open-label diuretic 26% 23%
Open-label Ace-I 16% 10%
Beta-blocker 19% 15%
ALLHAT
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Pre-Event Treatment of Non-Hospitalized but Treated
CHF ParticipantsPre-Event Medication
Chlorthalidone Group (n=93)
Doxazosin Group
(n=145)
Step 1 78% 88%
Open-label diuretic 28% 15%
Open-label Ace-I 15% 8%
Beta-blocker 19% 15%
ALLHAT
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Post-Event Treatment ofHospitalized CHF Participants
Post-Event Medication
Chlorthalidone Group (n=283)
Doxazosin Group (n=311)
Step 1 36% 45%
Open-label diuretic 58% 64%
Open-label Ace-I 39% 41%
Beta-blocker 14% 14%
ALLHAT
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Post-Event Treatment of Non-Hospitalized but Treated
CHF ParticipantsPost-Event Medication
Chlorthalidone Group (n=93)
Doxazosin Group (n=145)
Step 1 58% 64%
Open-label diuretic 61% 68%
Open-label Ace-I 33% 30%
Beta-blocker 19% 22%
ALLHAT
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Heart Failure Event Reporting
• Did the reports of hospitalized or fatal heart failure adhere to the study criteria?
ALLHAT
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ALLHAT Study Events
• Documentation required:– Discharge summaries for
all hospitalizations– Death certificates for all
deaths
• Additional QC documentation for random 10% sample of MI’s, strokes and fatal CHD
• Routinely reviewed for accuracy and appropriateness
• Queries sent to the sites for clarification of discrepancies
• A random 10% of MI’s, strokes and fatal CHD reports reevaluated by the Endpoints Subcommittee for quality control
ManagementDocumentation
ALLHAT
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Endpoint SubcommitteeEvaluation of CHF Events
• 50 cases of reported hospitalized and/or fatal CHF
• Each case reviewed by two Subcommittee members
• Criteria for confirmation of CHF as described in the Manual of Operations
ALLHAT
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Criteria for CHFEvaluation*
Must have one from each category:
Category “A” Category “B”Paroxysmal nocturnal dyspnea
Rales
Dyspnea at rest Ankle edema
NYHA Classification III Tachycardia
Orthopnea Cardiomegaly by CXR
CXR characteristic of CHF
S3 gallop
Jugular venous distention
*ALLHAT Manual of Operations, 5.3.4
ALLHAT
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New York Heart Association Functional Classification of Congestive Heart Failure*
I No limitations of activity; ordinary activity does not cause undue fatigue, palpitations, dyspnea or anginal pain
II Slight limitations of activity; asymptomatic at rest; ordinary activity results in fatigue, palpitations, dyspnea or anginal pain
III Marked limitations of activity; usually asymptomatic at rest; less than ordinary activity causes fatigue, palpitations, dyspnea or anginal pain
IV Inability to carry on any physical activity without discomfort; symptoms at rest; increased discomfort with any physical activity* Criteria Committee, New York Heart Association. Diseases of the heart and blood vessels. Nomenclature and criteria for diagnosis. 6th ed. 1964:114.
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Framingham Criteria for the Diagnosis of Congestive Heart Failure*
Major Criteria
Paroxysmal nocturnal dyspnea (A)
Neck vein distention (B)
Rales (B)
Cardiomegaly (B)
Acute pulmonary edema (B)
S3 gallop (B)
venous pressure (B)
+ hepatojugular reflux
Minor Criteria
Extremity edema (B)
Night cough (A)
Dyspnea on exertion (A)
Hepatomegaly
Pleural effusion (B)
Vital capacity by 1/3 of nml
Tachycardia >120 bpm (B)
Major or Minor
Weight loss >4.5 kg over 5 days’ treatment
At least two major or one major and two minor criteria are required for the diagnosis of CHF.
*KKL Ho et al, Circulation 88:107, 1993.
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Endpoints Subcommittee Evaluation of CHF Sample (n=50)
Drug group CHF per 1 or both
reviewers
Not CHF per 1 or
both reviewers
Insufficient data to call CHF
Total
Chlorthalidone
9 1 2 12
Doxazosin 9 1 2 12
Amlodipine 6 2 4 12
Lisinopril 9 2 3 14
Total 33 6 11 50Cases with insufficient data: 11/50
Remaining cases with CHF: 33/39 (85%)
Remaining chlorthalidone cases with CHF: 9/10 (90%)
Remaining doxazosin cases with CHF: 9/10 (90%)
ALLHAT
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Severity of Heart Failure
• What is the frequency of systolic dysfunction in doxazosin and chlorthalidone participants with heart failure?
• Is the systolic dysfunction equally severe in the chlorthalidone and doxazosin participants with heart failure?
ALLHAT
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Assessment of the Severityof Hospitalized and Fatal Heart Failure
• Half of hospitalized or fatal heart failure events reviewed for ejection fractions (EF)
• If EF documented, further information sought– How was it obtained?– Was the EF equally severe across drug groups?– Given possible differences between VA and non-
VA sites in levels of diagnostic testing, was there a difference between the two groups in EF data?
ALLHAT
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CHF Ejection Fraction Data
Chlorthalidone Group
Doxazosin
Group
Hospitalized or fatal events reviewed
170 191
Ejection fraction performed 79 (47%) 99 (52%)
By catheterization 17 33
By echocardiogram 60 64
By unknown means 2 2
ALLHAT
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CHF Ejection Fraction Data:Hospitalized or Fatal CHF
Ejection Fraction
%
Chlorthalidone Group
Doxazosin Group
1-30 35% 51%
31-40 31% 21%
41-50 18% 12%
51-70 16% 16%
ALLHAT
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CHF Ejection Fraction Data: Hospitalized or Fatal CHF (VA
Clinics)Ejection Fraction
%
Chlorthalidone Group
Doxazosin Group
1-30 38% 58%
31-40 42% 20%
41-50 8% 8%
51-70 13% 15%
ALLHAT
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CHF Ejection Fraction Data: Hospitalized or Fatal CHF (Non-VA
Clinics)
Ejection Fraction
%
Chlorthalidone Group
Doxazosin Group
1-30 32% 41%
31-40 20% 22%
41-50 28% 19%
51-70 20% 19%
ALLHAT
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Fatality Rates and Cause of Death
• Is all-cause mortality similar for the chlorthalidone and doxazosin participants?
• Are case-fatality rates similar and as high as expected for chlorthalidone and doxazosin participants hospitalized for heart failure?
• Are causes of deaths for chlorthalidone and doxazosin participants previously hospitalized for heart failure similarly distributed?
ALLHAT
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0.00
0.02
0.04
0.06
0.08
0.10
0 1 2 3 4
Cu
mu
lati
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Years of Follow-up
doxazosinchlorthalidone
All-Cause Mortality
C: 15,268D: 9,067
13,739 8,054
10,513 6,118
5,7023,287
2,5301,481
Rel Risk 1.03
p = 0.56
95% CL0.90-1.15
ALLHAT
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Cumulative Mortality forHospitalized CHF Cases
Cu
mu
lati
ve M
ort
alit
y R
ate
Years Hospitalized CHF to Death
0 1 2 3 4
0
.1
.2
.3
.4
.5
chlorthalidone
doxazosin
ALLHAT
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Causes of Death of Participants Hospitalized for CHF
Cause of DeathChlorthalidone
Group(ppts=280, deaths=52)
Doxazosin Group (ppts=317, deaths=70)
MI/CHD 25% 30%
Stroke 2% 4%
CHF 21% 17%
Other CVD 8% 10%
Total CVD deaths 56% 61%
Cancer 15% 9%
Kidney disease 2% 1%
Accident/suicide/homicide
0 1%
Other non-CVD 15% 16%
Unknown 12% 11%
ALLHAT
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Fatal and Hospitalized CHF: Increased Risk?
ALLHAT
Does the more stringent CHF outcome, fatal and hospitalized CHF, show a similarly increased CHF risk in the doxazosin group compared to the chlorthalidone group?
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Hospitalized or Fatal CHF
Rel Risk 95% CI
1.83 1.58-2.13
p < 0.001doxazosin
chlorthalidone
Years of Follow-up
Cu
mu
lative Even
t R
ate
0 0
0 1 2 3 4
0
.02
.04
.06
ALLHAT
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Relative Risks and 95% CIHospitalized or Fatal Congestive Heart
Failure Doxazosin/Chlorthalidone
0.000.501.001.502.002.503.003.504.004.50
High 2.13 2.43 2.20 2.83 2.38 4.38 3.19 1.98 4.08 2.46 2.15
Low 1.58 1.32 1.56 1.35 1.45 1.01 1.49 1.02 0.82 1.58 1.41
RR 1.83 1.79 1.85 1.95 1.86 2.10 2.18 1.42 1.83 1.97 1.74
TotalAge <65
Age 65+
BNH Men
WNH Men
Hisp Men
BNH Wome
WNH Wome
Hisp Wome
Diabetic
Nondia
ALLHAT
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Conclusions (1)
• The risk for the more stringent outcome of hospitalized or fatal heart failure was significantly higher in the doxazosin treatment group compared to the chlorthalidone treatment group (RR, 1.83; 95% CI, 1.58-2.13).
• Case-fatality rates for participants with heart failure were high (20% in 2 years) and similar in both groups.
• Hospital discharge data for heart failure was largely consistent with the ALLHAT definition of heart failure.
• In both groups, two thirds of the hospitalized or fatal heart failure events with ejection fraction measurements had ejection fractions of 40% or less.
ALLHAT
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Conclusions (2)
• The treatment following the heart failure events in both groups was consistent with recommended treatment of heart failure in the community.
• Similar percentages of participants in both treatment groups were on step 1 medication prior to the heart failure event.
• Participants who developed heart failure had a greater history of coronary heart disease than participants who did not develop heart failure.
ALLHAT