(Circulation. 1999;99:2334-2341.)
© 1999 American Heart Association, Inc.
Current Perspective |
From the Medical Research Council Clinical Research Initiative in Heart Failure, Wolfson Building, University of Glasgow, and Department of Cardiology, Western Infirmary, Glasgow, Scotland.
Correspondence to Prof John J.V. McMurray, Medical Research Council Clinical Research Initiative in Heart Failure, Wolfson Building, University of Glasgow, Glasgow G11 6 NT, Scotland. E-mail J.McMurray{at}bio.gla.ac.uk
Key Words: women heart failure sex epidemiology prognosis
| Introduction |
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| Epidemiology |
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Prevalence
With these caveats in mind, the major epidemiological surveys of
heart failure (see the
Figure
)2 3 4 5 show
that the overall prevalence rate of heart failure is similar in men and
women. This balance, however, reflects a much lower female prevalence
<70 to 75 years of age and a higher prevalence in older women than in
older men. Overall, within the population, there appear to be more
women than men with heart failure.6 7 8 Although
age-adjusted rates for both sexes have decreased from 19881995, rates
for women have fallen less than those for men.8B
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Incidence
Although the absolute incidence rate is lower than the prevalence
rate, the effect of age on sex incidence is
similar.3
| Etiology |
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Hypertension
The risk of heart failure imparted by hypertension is greater for
women than for men. In the Framingham study, the hazard in a
proportional hazards regression model (adjusting for age and other risk
factors) for developing heart failure in hypertensive compared with
normotensive subjects is about doubled in men and tripled in
women.9 In terms of population attributable risk,
the effect of hypertension is greater in women (59%) than men
(39%).9 These findings are supported by more
recent studies such as the SOLVD trials in which in the treatment trial
women were more likely to have concomitant hypertension (55% of women
versus 39% of men, P<0.001).10 The
higher prevalence of hypertension in women when compared with men with
heart failure is seen in both blacks (64.2% of women versus 60.2% of
men; P<0.05) and whites (42.9% of women versus 35.7% of
men; P<0.05).8B This difference between men and
women may reflect a sex difference in the cardiac response to an
increase in afterload.11
Coronary Artery Disease
The SOLVD trials10 reported that
coronary heart disease and, in particular, past myocardial
infarction are less frequently identified as an etiological factor in
women than in men with heart failure (Table 1
).
|
Furthermore, although white women admitted with heart failure have less coronary artery disease than their male counterparts, black women appear to have more coronary artery disease than black men.8B
Although the incidence of myocardial infarction is lower in women than in men, women who do sustain a myocardial infarction are more likely to develop heart failure.12 13 14 Interestingly, women are also more likely to develop heart failure after CABG than men (relative risk in CASS, 2.71; 95% CI, 1.86 to 3.93).15
Diabetes Mellitus
Diabetes seems to be a stronger risk factor for heart failure in
women than in men, especially in younger women. Several
studies,16 17 including
SOLVD,18 have reported that women with heart
failure are more likely to have diabetes than men
(SOLVD,19 49.3% women and 37.2% men,
P<0.02). In the Framingham study, although both young women
and young men with diabetes had a greater incidence of heart failure
than those without, the effect was greater in women (an 8-fold versus a
4-fold increase).3
A distinct diabetic cardiomyopathy has been proposed, and in the Framingham study, increased wall thickness and left ventricular mass were found in women but not in men with diabetes mellitus.20
Obesity, Cholesterol, and Smoking
Obesity (relative weight) is independently associated with
congestive heart failure in women and men.21 The
Framingham study identified a greater predictive value of obesity in
women.22 The ratio of total to HDL
cholesterol has also been identified as an independent risk
factor for heart failure.22 Total
cholesterol is significantly related to the incidence of
heart failure only in men <65 years of age. Smoking in the same study
was also found to increase the risk of heart failure in young men and
old women.22 Smoking is less common in female
than male heart failure patients.14
Valvular Heart Disease
The SOLVD,23 Framingham,24 and
hospital-based8B studies report a predominance of women
with valvular heart disease. However, data from the 30-year
follow-up of the Framingham study suggest a declining frequency of
heart failure secondary to valvular disease in both
sexes.24 Rheumatic heart disease declined from
22% to 15% in women and 15% to 3% in men over this time
period.24
Idiopathic Dilated Cardiomyopathy
Women are reported to have a markedly lower prevalence of
idiopathic dilated cardiomyopathy in many studies
(male-to-female ratio,
1.94.3:1),8B 25 26 27 28 perhaps because the
male population has a greater prevalence of covert alcohol abuse or
asymptomatic coronary artery disease. Women who do
develop idiopathic dilated cardiomyopathy, however,
have greater ventricular dimensions and shorter exercise
duration.29 It should be noted, however, that
more women than men had an "unknown" cause of left
ventricular systolic dysfunction in the SOLVD
trials (16% versus 9% in men in the prevention arm and 26% versus
16% in the treatment arm,
P<0.001).10
Alcoholic Cardiomyopathy
The evidence of a sex influence on susceptibility to
alcohol-induced heart failure is inconclusive. Despite a mean lifetime
alcohol dose of 60% of that of their male counterparts, women have
been found to suffer from alcoholic cardiomyopathy
at a similar rate.30 Another study has found a
positive association between alcoholic
cardiomyopathy and male
sex.31 Further studies are required to examine
this issue.
Peripartum Cardiomyopathy
Peripartum cardiomyopathy is a rare but
important disorder that has been reviewed
elsewhere.32
X-Linked Cardiomyopathy
Families with patterns of inheritance suggesting an X-linked
cardiomyopathy have been
described.33 34 35 36 37 Clinical expression is that of
early onset and rapid progression in men and later onset and slower
progression in women. Work to further classify the genetic
abnormalities concerned is continuing.
| Diagnosis |
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| Patient Management |
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Patient Investigation
There are few data in the literature on the use of investigations
according to sex. In 1 report, however, women were less likely than men
to undergo measurement of left ventricular function (36%
of women versus 42% of men).44 A further large
study of patients admitted with heart failure found that women were
equally likely to have an echocardiogram but were less likely to
undergo cardiac catheterization. Both black and white women were less
likely than men to undergo ventriculography, Holter monitoring, and
exercise stress testing.8B
| Morbidity |
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Quality of Life
The limited data available on quality of life in heart failure
include an analysis by the SOLVD investigators that found that
women experience greater shortness of breath on exertion (58% versus
48% of men, P<0.001) and make up fewer of the NYHA class 1
subgroup (6% versus 12%, P<0.001) than
men.10 This trend toward greater functional
impairment was seen in both the treatment and prevention trials. In a
series of 45 894 patients admitted with heart failure, women had lower
baseline physical health status and experienced less improvement in the
year after admission than men.44A In contrast to these two
large studies, several small studies have failed to show differences in
quality of life.44B 44D Women with idiopathic dilated
cardiomyopathy have been found to have a shorter
exercise duration.29 Although far from
exhaustive, this evidence suggests that women with heart failure have a
poorer quality of life.
Symptoms and Signs
Women appear to experience more symptoms and present more
frequently with signs of heart failure. The SOLVD investigators found
that women had more edema than men (15% of men versus 22% of
women).10 More women than men had an audible
third heart sound (17% versus 11%, P<0.001) and elevated
jugular venous pressure (17% versus 5%,
P<0.001).10 Women with idiopathic
dilated cardiomyopathy report more symptoms and a
shorter exercise duration and present more frequently with heart
failure signs.29 Again, the data are limited but
are consistent with the findings on quality of life reported
earlier.
Hospitalizations for Heart Failure
In keeping with the population prevalence of heart failure,
published reports of hospitalization from the United
Kingdom,8 Sweden,31 New
Zealand,45 the United
States,6 7 16 46 and the
Netherlands47 all show higher hospital admission
and discharge rates for men than women in younger age groups with a
diminishing difference in older age categories. Because the highest
prevalence rate is found in older subjects and because there are more
older women than men in most first-world populations, the absolute
number of hospitalizations for women is greater than that for
men.7 8
Women in the SOLVD Registry had a higher annual admission rate than men (22% versus 17%, P=0.05).48 Women also have consistently longer stays in the hospital than men.8 8B 45 47 The reason for this is not clear. Women with congestive heart failure are older,47 48 49 and age influences length of stay.45 47 Women may also have more comorbidity and be more likely to live alone. Readmission rates, however, were independent of sex in 2 studies8 50 and lower for women in another.51
Thromboembolism
Left ventricular ejection fraction is inversely
associated with the risk of thromboembolism in women but not in
men.52 Women with heart failure are also at
greater risk of pulmonary embolism than men
(P=0.01).52
It is not clear whether or not the sex difference in morbidity in the above studies reflects later referral, more advanced ventricular dysfunction, or a biological difference between the sexes (or some combination of these factors).
| Mortality |
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In contrast, the SOLVD investigators reported quite the opposite finding; they described a worse outlook for women who had a 1- year mortality rate of 22% compared with 17% for men (P=0.05).48 This survival differential was apparent for total mortality, cardiac mortality, death from progressive pump failure, and presumed arrhythmic death.
These contrasting findings are interesting and important. As alluded to earlier, fewer women with the symptoms and signs of heart failure have left ventricular systolic dysfunction, ie, the form of heart failure with the gravest prognosis.
Interestingly, even in the CONSENSUS-1 study, in which patients were not recruited on the basis of left ventricular function, women were much more likely to have echocardiographic fractional shortening above the median than men (48% of women versus 15% of men, P<0.05).54 Framingham49 and NHANES-12 did not assess left ventricular function, whereas all patients in SOLVD48 had reduced left ventricular ejection fractions. SOLVD, therefore, represents a more homogeneous group of patients with a particular type of heart failure. Etiology may also explain in part the differences between SOLVD and Framingham and NHANES-1. As with men, women with heart failure that is not caused by coronary heart disease fare better than those with coronary heart failure. SOVLD contained more women with coronary heart failure than Framingham or NHANES-1. Whatever the explanation, the worse prognosis of women in SOLVD is unsurprising given their greater symptom burden and poorer quality of life (see above). Women in the SOLVD trials also had more cardiomegaly (cardiothoracic ratio >0.5) than men: 51% versus 37% in men in the prevention arm (P<0.001) and 65% versus 53% in the treatment arm (P<0.001).10 Once again, it is unclear whether these sex differences reflect later referral, more advanced disease, or a biological difference between the sexes.
| Women in Clinical Trials in Heart Failure |
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Trials of Digoxin, ß-Blockers, and Hydralazine Plus
Isosorbide Dinitrate
Trials of digoxin in heart failure have not reported subgroup
analyses by sex.66 67 68 Although reporting
a total of only 14 deaths in women, the US Carvedilol Group found a
statistically significant reduction in the number of deaths in women
and men.65 The other large ß-blocker trials
have not reported sex-specific mortality.66 67 68
The V-HeFT Trial, which showed a mortality benefit with the
vasodilating combination of isosorbide dinitrate and
hydralazine, recruited only men.56
Trials With ACE Inhibitors in Heart Failure
ACE inhibitors are widely used in the management of
heart failure in both men and women. The large multicenter trials that
have reported mortality and morbidity benefit, however, have contained
only a small proportion of women. Subgroup analysis of the
CONSENSUS-1 study showed a statistically significant reduction in
mortality with enalapril in men but not in
women.69 Whereas men achieved a 51% reduction in
6-month mortality (P<0.001), women achieved only a 6%
reduction (P=NS). The SOLVD investigators found that men and
women treated with enalapril experienced a reduction in mortality and
hospitalizations, although this effect was less for
women.1 These trials, however, contained small
numbers of women and were not designed to examine mortality benefit in
women and men separately. In a meta-analysis of the ACE
inhibitor trials, the survival benefit with active therapy
appeared to be similar in both sexes: 0.76 for men and 0.79 for
women.70 Active therapy had a similar effect on
the combined end point of total mortality and hospitalizations: 0.63
for men and 0.78 for women. However, the odds ratios (ACE
inhibitor versus placebo) for women, unlike those for men,
crossed 1.00 for the end point of total mortality and the combined end
point of total mortality and hospitalization for heart
failure.
Trials With ACE Inhibitors in Patients With
PostMyocardial Infarction Left Ventricular
Systolic Dysfunction and Heart Failure
In the AIRE study, treatment with ramipril in patients with signs
of heart failure after myocardial infarction led to a significant
reduction in mortality in both sexes.71 The other
3 studies of ACE inhibitors in patients with left
ventricular dysfunction after myocardial infarction did not
report a significant mortality benefit for women. TRACE included 28%
women, and the relative risks with trandolapril were 0.75 (95% CI,
0.62 to 0.89) for men and 0.90 (95% CI, 0.69 to 1.18) for
women.72 In the SMILE trial, the relative risks
with zofenopril were 0.59 (95% CI, 0.36 to 0.95) for men and 0.70
(95% CI, 0.40 to 1.21) for women.73 In SAVE, the
results for women were again disappointing.74
There was only a 2% mortality risk reduction in women versus a 22%
risk reduction in men. For the combined end point of
cardiovascular death and morbidity, there was only a
4% risk reduction in women but a 28% risk reduction in men. After
adjustment for other variables (such as age), however, the relative
risks of an end point for women and men were 19% and 21% in the ACE
inhibitor group.
Although these results with ACE inhibitors in heart failure and after myocardial infarction reflect, at least in part, the small numbers of women included in the trials, they do leave open the possibility that ACE inhibitors are less effective in women. This, in turn, could reflect a higher rate of treatment withdrawal in women (see the "Adverse Effects" section).
Angiotensin II Receptor Antagonists
The ELITE study recently compared the effects of the
angiotensin II type 1 receptor antagonist
losartan and the ACE inhibitor captopril,
suggesting that the former treatment may be more
effective.61 Again, the numbers of women were
small (ratio of men to women: losartan, 234:118; captopril,
248:122). The distribution of deaths in women (9 of 118 and 8 of 122
deaths in the losartan and captopril groups, respectively) does
not support the extrapolation of any trend in mortality benefit to
women.
Sex Differences in the Adverse Effect Rate in ACE Inhibitor
Trials
There was a higher rate of adverse effects reported by women than
by men in the SOLVD trials. This sex difference was seen during both
the medication challenge phase of SOLVD75 and
long-term treatment.76 The sex difference in
coughing is perhaps best recognized and may reflect the greater
average milligram-per-kilogram dose of drug received by women in trials
using a fixed absolute-dosing regimen. Women, however, are also more
likely to experience other side effects, including a greater rise in
creatinine, taste disturbance, skin rash, and
gastrointestinal upset.
Other Sex Influences on Response to Pharmacological
Treatment
Female sex is a risk factor for torsade de pointes with
D-sotalol, an agent shown to increase mortality in patients
with left ventricular systolic
dysfunction.77
Underprescription of ACE Inhibitors in Women With Heart
Failure and Left Ventricular Dysfunction
Women receive ACE inhibitors less often than men as
treatment for heart failure,78 79 even in the
absence of contraindications.80 The cause of ACE
inhibitor underprescription for both sexes, and
particularly the sex disparity, is unclear. Oversight and ignorance of
prognostic benefit would seem likely candidates for suboptimal use in
both sexes. Perhaps physicians recognize women to be at greater risk of
adverse effects than men, although this should not necessarily preclude
treatment.
Adherence to Prescribed Therapy
In 1 study, women were significantly more adherent to prescribed
digoxin treatment than men.81
| Heart Transplantation |
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Is There a Pathophysiological Basis for the Sex
Differences in Heart Failure?
Although many of the sex differences in heart failure highlighted
in this review may be explained by differences in referral and
treatment patterns, there is also evidence that some of these
differences could have a pathophysiological basis.
The myocardial response to injury may vary between sexes.
Sex differences in left ventricular responses to hypertension11 and aortic stenosis87 88 89 have been found. Premenopausal women with mild hypertension have smaller ventricular dimensions and enhanced ventricular performance compared with men.11 Olivetti et al90 found that aging female hearts do not suffer from the annual 1-g myocyte loss seen in male hearts. Data from SOLVD found male but not female sex to be a predictor of left ventricular dilatation (P<0.04).91
Women admitted with heart failure have less frequent serious ventricular arrhythmias than men.8B
Investigation of possible sex differences in the neuroendocrine response to heart failure is awaited. Variation in vascular responsiveness according to sex has not been described in heart failure.
Any pathophysiological basis of sex differences in heart failure is likely to reflect a complex interaction of hormonal, vascular, and ventricular factors.
| Conclusions |
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| Acknowledgments |
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| References |
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