Acute myocardial infarction in women: contribution of treatment variables to adverse outcome

Gender Differences in Hospital Mortality and Use of Percutaneous Coronary Intervention in Acute Myocardial Infarction

BACKGROUND

Women with acute myocardial infarction have a higher hospital mortality rate than men. This difference has been ascribed to their older age, more frequent comorbidities, and less frequent use of revascularization. The aim of this study is to assess these factors in relation to excess mortality in women.

METHODS AND RESULTS

All hospital admissions in France with a discharge diagnosis of acute myocardial infarction were extracted from the national payment database. Logistic regression on mortality was performed for age, comorbidities, and coronary interventions. Nonparametric microsimulation models estimated the percutaneous coronary intervention and mortality rates that women would experience if they were "treated like men." Data were analyzed from 74,389 patients hospitalized with acute myocardial infarction, 30.0% of whom were women. Women were older (75 versus 63 years of age; P<0.001) and had a higher rate of hospital mortality (14.8% versus 6.1%; P<0.0001) than men. Percutaneous coronary interventions were more frequent in men (7.4% versus 4.8%; 24.4% versus 14.2% with stent; P<0.001). Mortality adjusted for age and comorbidities was higher in women (P<0.001), with an excess adjusted absolute mortality of 1.95%. Simulation models related 0.46% of this excess to reduced use of procedures. Survival benefit related to percutaneous coronary intervention was lower among women.

CONCLUSIONS

The difference in mortality rate between men and women with acute myocardial infarction is due largely to the different age structure of these populations. However, age-adjusted hospital mortality was higher for women and was associated with a lower rate of percutaneous coronary intervention. Simulations suggest that women would derive benefit from more frequent use of percutaneous coronary intervention, although these procedures appear less protective in women than in men.

Are There Gender Differences Related to Symptoms of Acute Myocardial Infarction? A Norwegian Perspective

The purpose of this study was to compare symptom presentation and illness behavior among women and men with acute myocardial infarction and assess various aspects that influence prehospital delay. This is a cross-sectional, retrospective study using self-reported questionnaires. The sample consisted of 82 women and men in Norway, up to 65 years of age, with first-time acute myocardial infarction between March and October 1999. The findings demonstrated that the most commonly reported symptom in both genders was chest pain. More than 90% of women and men experienced chest pain, with no difference between the genders. More women than men had nausea as well as pain located in their arms, back, jaw, and throat. More men than women attributed their symptoms to be cardiac in origin. Experiencing pain in the shoulders, attributing symptoms to be noncardiac, consulting a family member, and contacting several medical practitioners increased prehospital delay. During the year before the event, women were more likely to experience fatigue than men. The conclusion of this study is that women experienced a greater diversity of symptoms than men. Acute symptoms, interpretation of symptoms, and illness behavior may influence prehospital delay.

Gender differences in aspirin use among adults with coronary heart disease in the United States

BACKGROUND

Aspirin reduces mortality for men and women with coronary heart disease (CHD). Previous research suggests women with acute coronary syndromes receive less aggressive care, including less frequent early administration of aspirin. The presence of gender differences in aspirin use for secondary prevention is less clear.

OBJECTIVE

To determine if a gender difference exists in the use of aspirin for secondary prevention among individuals with CHD.

DESIGN

We analyzed data from the nationally representative 2000-2002 Medical Expenditure Panel Surveys to determine the prevalence of regular aspirin use among men and women with CHD.

PARTICIPANTS

Participants, 1,869, 40 years and older who reported CHD or prior myocardial infarction.

RESULTS

Women were less likely than men to use aspirin regularly (62.4% vs 75.6%, p < .001) even after adjusting for demographic, socioeconomic and clinical characteristics (adjusted OR = 0.62, 95% CI, 0.48-0.79). This difference narrowed but remained significant when the analysis was limited to those without self-reported contraindications to aspirin (79.8% vs 86.4%, P = .002, adjusted OR = 0.68, 95% CI, 0.48-0.97). Women were more likely than men to report contraindications (20.5% vs 12.5%, P < .001). Differences in aspirin use were greater between women and men with private health insurance (61.8% vs 79.0%, P < .001, adjusted OR = 0.48, 95% CI, 0.35-0.67) than among those with public coverage (62.5% vs 70.7%, P = .04, adjusted OR = 0.74, 95% CI, 0.50-1.11) (P < .001 for gender-insurance interaction).

CONCLUSION

We found a gender difference in aspirin use among patients with CHD not fully explained by differences in patient characteristics or reported contraindications. These findings suggest a need for improved secondary prevention of cardiovascular events for women with CHD.

Gender differences in in-hospital mortality and mechanisms of death after the first acute myocardial infarction

BACKGROUND

There are conflicting data about gender differences in short-term mortality after acute myocardial infarction (AMI) after adjusting for age and other prognostic factors. Therefore, we investigated the risk profile, clinical presentation, in-hospital mortality and mechanisms of death in women and men after the first AMI.

METHODS

The data were obtained from a chart review of 3382 consecutive patients, 1184 (35%) women (69.7+/-10.9 years) and 2198 (65%) men (63.5+/-11.8 years) with a first AMI. The effect of gender and its interaction with age, risk factors and thrombolytic therapy on overall mortality and mechanisms of death were examined using logistic regression.

RESULTS

Unadjusted in-hospital mortality was higher in women (OR 1.77, 95% CI 1.47-2.15). Adjustment that included both age only and age and other baseline differences (hypertension, diabetes mellitus, hypercholesterolemia, smoking, AMI type, AMI site, mean peak CK value, thrombolytic therapy) decreased the magnitude of the relative risk of women to men but did not eliminate it (OR 1.26, 95% CI 1.03-1.54 and OR 1.31 95% CI 1.03-1.66, respectively). Multivariate analysis revealed that female gender was an independent predictor of in-hospital mortality after the first AMI. Women were dying more often because of mechanical complications - refractory pulmonary edema and cardiogenic shock (P=0.02) or electromechanical dissociation (P=0.03), and men were dying mostly by arrhythmic death, primary ventricular tachycardia/fibrillation (P=0.002). Female gender was independently associated with mechanical death (OR 1.56, 95% CI 1.35-2.58; P=0.01) and anterior AMI was independently associated with arrhythmic death (OR 0.54, 95% CI 0.34-0.86; P=0.01).

CONCLUSION

Our results demonstrate significant differences in mechanisms of in-hospital death after the first AMI in women and men, suggesting the possibility that higher in-hospital mortality in women exists primarily because of the postponing AMI death due to the gender-related differences in susceptibility to cardiac arrhythmias following acute coronary events.

The influence of race and gender on time to initial electrocardiogram for patients with chest pain

OBJECTIVES

To determine whether race or gender affected time to initial electrocardiogram (ECG) for patients who presented to an emergency department with chest pain.

METHODS

This was a prospective cohort study of patients with chest pain. Patients were divided into three groups based on final diagnosis of acute myocardial infarction or unstable angina and all others with noncardiac chest pain. Data were analyzed using ranks in a two-way analysis of covariance adjusted for age.

RESULTS

A total of 4,358 patients were studied; 58.6% were women and 41.4% men, and 70.3% were African American, 26.0% white, and 3.6% other. Overall, nonwhite patients had longer times to initial ECG compared with white patients. These effects were consistent regardless of ultimate diagnosis. Overall, women had longer times to initial ECG than men. However, ECG time differed by final diagnosis. There were no differences in time to ECG for women compared with men with acute myocardial infarction or unstable angina, but women received an ECG significantly slower than men for noncardiac chest pain.

CONCLUSIONS

The first screening test for acute coronary syndrome, the ECG, took longer to obtain for nonwhite patients, regardless of final diagnosis. This was unfortunately consistent with the literature that shows racial disparities in all aspects of emergent cardiac care. For women, the overall delay in ECG time can be explained by delays for those women with noncardiac chest pain.

Younger age potentiates post myocardial infarction survival disadvantage of women

BACKGROUND

Female patients with acute myocardial infarction (MI) exhibit higher unadjusted in-hospital mortality rates compared to male patients. However, contradictory evidence exists on whether this survival disadvantage disappears after adjustment for age and other prognostic factors. This study, based on a countrywide survey of consecutive unselected patients with acute MI, examined whether female gender is an independent predictor of poor short-term outcome and less intensive in-hospital treatment.

METHODS

Data on a total of 7433 patients were analyzed.

RESULTS

The mean age was 64+/-13 years and the proportion of females in this population was 23%. Univariate and multivariate predictors of in-hospital mortality in female patients were estimated. Unadjusted in-hospital mortality rates of women were significantly higher compared to men (17.7 vs. 8.6, p<0.001). In multivariate analysis, female gender was an independent predictor of in-hospital mortality in the total population [relative risk (RR)=1.29, 95% confidence interval (CI)=1.02-1.64, p=0.036]. The RR of women for in-hospital death was exaggerated among younger patients, aged <55 years (RR=3.84, 95% CI=1.07-13.74, p=0.039). Female gender was also independently and inversely associated with administration of thrombolytic treatment (RR=0.724, 95% CI=0.630-0.831, p=<0.001).

CONCLUSION

Although female gender is an independent predictor of higher post-MI in-hospital mortality with a pronounced effect among younger patients, women are less likely to receive thrombolysis than men. Based on the results from this countrywide study, we should consider women, especially of younger age, as patients at particular high risk, who contrary to common practice, deserve more intensive and aggressive in-hospital treatment.

Combined Anticoagulant–Antiplatelet Use and Major Bleeding Events in Elderly Atrial Fibrillation Patients

Background and Purpose— Bleeding risks from combined antiplatelet-warfarin therapy have not been well-described in clinical practice. We examined antiplatelet therapy among warfarin users and the impact on major bleeding rates.

Methods— Retrospective cohort analysis of persons discharged on warfarin after an atrial fibrillation admission using data from Medicare’s National Stroke Project. Data included Medicare claims, enrollment information, and medical record abstracted data. Logistic regression and Cox proportional hazards models were used to predict concurrent antiplatelet use and hospitalization with a major acute bleed within 90 days after discharge from the index AF admission.

Results— 10 093 warfarin patients met inclusion criteria with a mean age of 77 years; 19.4% received antiplatelet therapy. Antiplatelet use was less common among women, older persons, and persons with cancer, terminal diagnoses, dementia, and bleeding history. Persons with coronary disease were more likely to receive an antiplatelet agent. Antiplatelets increased major bleeding rates from 1.3% to 1.9% ( P =0.052). In the multivariate analysis, factors associated with bleeding events included age (OR, 1.03; 95% CI, 1.002 to 1.05), anemia (OR, 2.52; 95% CI, 1.64 to 3.88), a history of bleeding (OR, 2.40; 95% CI, 1.71 to 3.38), and concurrent antiplatelet therapy (OR, 1.53; 95% CI, 1.05 to 2.22).

Conclusions— Although concerns about increased bleeding risk with combined warfarin-antiplatelet therapy are not unfounded, the risk of bleeding is moderately increased. The decision to use concurrent antiplatelet therapy appears to be tempered by cardiac and bleeding risk factors.

Risk factors and in-hospital outcomes in stroke and myocardial infarction patients

BACKGROUND

Acute stroke (AS) and acute myocardial infarction (AMI) share major risk factors such as age, gender, and high blood pressure. The main objective of this study was to compare vascular risk factor profiles with in-hospital outcomes in AS and AMI patients.

METHODS

We evaluated 486 consecutive patients who were admitted to Bjelovar General Hospital with diagnoses of AS (ischaemic stroke or intracerebral haemorrhage; N = 380) or AMI (N = 106) during a one year period. The frequency of risk factors and in-patient mortality rates were assessed in both groups. For statistical analysis we used t-tests and chi2 tests.

RESULTS

AS patients were significantly older than AMI patients: the mean age for AS patients was 68.9 +/- 9.1 years, and for AMI patients was 62.8 +/- 11.7 years (p < 0.001). AMI was significantly more common than AS in patients younger than 65 years; 51% of this group had AMI and 26% had AS (p < 0.001). Hypertension was a more common risk factor in AS patients (69% AS patients vs. 58% AMI patients; p = 0.042). Patients who died did not differ significantly in age between the groups. In-patient mortality rates were significantly higher in AS than AMI cases (31% vs. 12%, p < 0.001 for all patients; 37% vs.5%, p < 0.001 for men). Women hospitalized for AMI were more likely to die in hospital than men (28% vs. 5%; p = 0.002).

CONCLUSIONS

We found that age at the time of presentation was a significant differentiating factor between patients with AS and AMI. The only exceptions were women, whose ages at the onset of AS and AMI were similar. In contrast, patients who died did not differ significantly in age. We observed significantly higher inpatient mortality for men (when adjusted for age) than for women with AS. The five-fold higher in-patient mortality rate in women than in men with AMI is most likely to have resulted from other factors related to treatment.

Ethnic variations in female vulnerability after an acute coronary event

OBJECTIVE

To determine the ethnic variation of short and long term female vulnerability after an acute coronary event in a population of Chinese, Indians, and Malays.

DESIGN

Population based registry.

PATIENTS

Residents of Singapore between the ages of 20-64 years with coronary events. Case identification and classification procedures were modified from the MONICA (monitoring trends and determinants in cardiovascular disease) project.

MAIN OUTCOME MEASURES

Adjusted 28 day case fatality and long term mortality.

RESULTS

From 1991 to 1999, there were 16 320 acute coronary events, including 3497 women. Age adjusted 28 day case fatality was greater in women (51.5% v 38.6%, p < 0.001), with a larger sex difference evident among younger Malay patients. This inequality between the sexes was observed in both the pre-hospitalisation and post-admission periods. Among hospitalised patients, women were older, were less likely to have suffered from a previous Q wave or anterior wall myocardial infarction, and had lower peak creatine kinase concentrations. Case fatality was higher among women, with adjusted hazard ratios of 1.64 (95% confidence interval (CI) 1.43 to 1.88) and 1.50 (95% CI 1.37 to 1.64) for 28 day and mean four year follow up periods. There were significant interactions of sex and age with ethnic group (p = 0.017). The adjusted hazards for mortality among Chinese, Indian, and Malay women versus men were 1.30, 1.71, and 1.96, respectively. The excess mortality among women diminished with age.

CONCLUSION

In this multiethnic population, both pre-hospitalisation and post-admission case fatality rates were substantially higher among women. The sex discrepancy in long term mortality was greatest among Malays and in the younger age groups.

Coronary heart disease: the female heart is vulnerable

During the past decade, an overall theme has emerged, validating the exploration of gender-based differences in coronary heart disease (CHD) as a basis for clinical strategies to improve outcomes for women. Underrepresentation of women in most of CHD and lack of gender-specific reporting in many clinical trials continue to limit the available knowledge and evidence-based medicine needed to devise optimal managements for women with CHD. Control of conventional coronary risk factors provides comparable cardioprotection for men and women. Current evidence fails to show cardiac protection from menopausal hormone therapy. Clinical presentations of coronary heart disease (CHD) and management strategies differ between the sexes. Underutilization of proven beneficial therapies is a contributor to less-favorable outcomes in women. The contemporary increased application of appropriate diagnostic, therapeutic, and interventional managements has favorably altered the prognosis for women, particularly when the data are adjusted for baseline characteristics. Better education of women during office visits, earlier and more aggressive control of coronary risk factors, and a greater index of suspicion regarding chest pain and its appropriate evaluation may help to reverse the trend of late referral and late intervention. Research indicates that behavioral changes on the part of women and reshaping of practice patterns by their health care providers may dramatically reduce the number of women disabled and killed by CHD each year.

Women's health after a first myocardial infarction: a comprehensive perspective on recovery over a 4-year period

BACKGROUND

Little attention has so far been focused on follow ups of women's long-term recovery after a myocardial infarction (MI), especially from a comprehensive perspective.

AIM

The aim of this study was to prospectively determine women's self-rated health after a first MI from a comprehensive perspective on recovery over a 4-year period.

METHODS

Consecutively chosen women (n=240) who had suffered a first MI were asked to complete a self-rated questionnaire regarding health (including not only biophysical, but also behavioral, emotional, social and working conditions) before being discharged from hospital as well as 1 and 4 years later. The results were analyzed by descriptive and inferential statistics.

RESULTS

Health improvements, especially during the first year, could be observed in the women's behavioral condition regarding their attitude to diet consciousness, exercise, simultaneous capability and smoking behavior as well as in the emotional condition regarding their stressful life events, depressed mood and loss of control. In the social condition, the women considered that the healthcare professionals had improved their support over time as well as treating the women's complaints more seriously. Regarding the working condition, the women felt that they were being controlled at work, especially during the first year after the MI.

CONCLUSIONS

Based on a comprehensive perspective on women's recovery after a first MI, a favorable development of the women's health was observed in the behavioral and emotional conditions while deterioration in the social and working conditions was observed over time. Thus, further efforts are needed in the two latter conditions by means of further studies in combination with greater support from healthcare professionals.

Presentation, delay, and contraindication to thrombolytic treatment in females and males with myocardial infarction

BACKGROUND

This study seeks to explore gender-relevant factors of medical history, sociodemographics, symptom presentation, and delay on thrombolysis administration (or recorded contraindication) in a sample of men and women with confirmed myocardial infarction (MI).

METHODS

Cross-sectional examination of self and nurse-report data collected in the coronary care unit (CCU) from 12 hospitals across south-central Ontario, Canada. A total of 482 MI patients (347 males, 135 females; 63% response rate) were recruited.

MAIN FINDINGS

There was no gender difference in the report of chest pain (chi(2)(1) = 3.78, p =.052), or in prehospital delay time (median = 96.5 minutes). Thrombolysis was administered in 158 males (68.4%) and 50 females (50.0%) without reported contraindication. Females (median = 27 minutes) had a significantly longer interval between diagnostic electrocardiogram (ECG) and administration of a thrombolytic than males (median = 22, U = 3,056). No contraindication was indicated for not administering a thrombolytic (i.e., too late, risk of bleed) in approximately 40% of females. In accordance with clinical practice guidelines, thrombolysis was more often administered in participants with a shorter time interval between symptom onset and hospital arrival. For females, thrombolysis was more often administered in younger participants (Kruskal Wallis = 5.88).

CONCLUSIONS

Reducing gender, age, and socioeconomic disparities in access to thrombolysis treatment is imperative. Hospital delays with female cardiac patients may be precluding thrombolysis administration.

Sex differences in infection and sepsis

Sex and gender-based differences in responses to infection and sepsis are evident. Estrogens increase immune function, sometimes to the point of inducing autoimmune disease. Testosterone suppresses immune function, sometimes leading to a worsened outcome following traumatic injury. Therapies using sex hormones to improve outcomes after sepsis and hemorrhagic shock and to reduce exacerbations of autoimmune diseases are being studied. Differences in sex hormone levels may not tell the whole story. Studies of immune function in girls and boys before puberty may be helpful. Differences found early might indicate that factors other than estrogen and androgen levels are contributing. Variations in societal role acculturation and exposures that are gender based also may be involved. Clinicians must consider sex and gender when attempting to determine the risk of infection, sepsis, and immune dysfunction in populations. Clinical applications of sex and gender differences are just beginning to occur with the genesis of sex hormone-based treatments. The large-scale efficacy of such treatments has yet to be reported. Innovative strategies based on sex or gender differences in immune responses may soon be available and may lead to essential data for clinical decision making. The impact of sex and gender differences on long-term health outcomes remains to be seen.

Chest pain in hospitalized patients: cause-specific and gender-specific differences

OBJECTIVES

The aim of this prospective cardiological-linguistic study was to assess cause-specific and gender-specific differences in the reported symptoms and description of chest pain.

METHODS

In patients hospitalized because of chest pain, location, radiation, quality of chest pain, pain precipitating and relieving factors, and additional symptoms were assessed. The cause of chest pain was assessed as either coronary or noncoronary. Patients' pain descriptions were taped for linguistic narrative analysis and transcribed according to ethnomethodological standards.

RESULTS

The cause of chest pain was assessed as coronary in 43 (18 females, 25 males, mean age 63 years) and noncoronary in 49 (30 females, 19 males, mean age 62 years) patients. Only few cause-related differences in the symptoms were found. In patients with a coronary cause, the location of chest pain was more often retrosternal (93% vs. 71%, p = 0.0078), in the right arm (23% vs. 6%, p = 0.0186), and less often in the back (28% vs. 51%, p = 0.0241) than in patients with a noncoronary cause of chest pain. Coronary patients more often had a pressing pain quality (81% vs. 61%, p = 0.034), less often pain precipitated by respiration (16% vs. 45%, p = 0.0032), and vertigo (21% vs. 43%, p = 0.0252) than noncoronary patients. The women were older than the men (mean age 65.6 vs. 59.0 years, p = 0.01). Women with a coronary cause more often had a gradual pain onset (78% vs. 48%, p = 0.0488) and relief by rest (78% vs. 40%, p = 0.0139) than men with a coronary cause. Linguistic analysis revealed that men presented themselves as interested in the cause of the chest pain, observing and describing pain concretely, whereas women presented themselves as prevailingly pain enduring, describing their pain diffusely.

CONCLUSIONS

Cause-related and gender-related differences in symptoms are too unspecific to distinguish between coronary and noncoronary causes. The strong gender differences in self-presentation and description of chest pain might be an explanation for underdiagnosis and undertreatment of women with coronary heart disease and should be considered when taking the clinical history of a female patient.

Percutaneous coronary intervention vs. medical therapy: what are the implications for women?

There have been eight major studies assessing percutaneous coronary intervention (PCI) vs. medical therapy in the past 10 years. Women were inadequately represented in many of these studies, but because of similar long-term survival curves in women and men, most of the PCI data can be applied to women until more trials are published. According to currently available data, PCI offers greater angina relief and improvement in exercise tolerance than medicine alone, but has a greater risk of procedure-related complications in women. As a result of the rapid advancement of cardiovascular therapy, many of these studies did not incorporate optimal medical therapy or current PCI therapies. It is likely that for most patients (including women) with moderate angina, the best management may be a combination of PCI, medical therapy, and lifestyle changes.

Getting more for their dollar: a comparison of the NHS with California's Kaiser Permanente

OBJECTIVE

To compare the costs and performance of the NHS with those of an integrated system for financing and delivery health services (Kaiser Permanente) in California.

METHODS

The adjusted costs of the two systems and their performance were compared with respect to inputs, use, access to services, responsiveness, and limited quality indicators.

RESULTS

The per capita costs of the two systems, adjusted for differences in benefits, special activities, population characteristics, and the cost environment, were similar to within 10%. Some aspects of performance differed. In particular, Kaiser members experience more comprehensive and convenient primary care services and much more rapid access to specialist services and hospital admissions. Age adjusted rates of use of acute hospital services in Kaiser were one third of those in the NHS.

CONCLUSIONS

The widely held beliefs that the NHS is efficient and that poor performance in certain areas is largely explained by under investment are not supported by this analysis. Kaiser achieved better performance at roughly the same cost as the NHS because of integration throughout the system, efficient management of hospital use, the benefits of competition, and greater investment in information technology.

Gender- and age-related prescription drug use patterns

OBJECTIVE

To report the top 15 prescription drug categories used by males and females of all ages and to compare this information with national prevalence data.

METHODS

Data used were pharmacy claim and eligibility information over the period January 1, 1999, through December 31, 1999, for 1,294,295 members of a large pharmacy benefit manager. Participant ages ranged from 1 to more than 100 years. Each participant was assigned to 1 of 9 age categories. Use of a drug category was defined as filling at least 1 prescription for a medication in that category during the study year. The percentage of males and females that used each drug group was established, and the 15 drug groups used most frequently were reported for each age category.

RESULTS

Most gender differences in medication use appear after or around the puberty years. Women are more likely to use several classes of medications, including antidepressants and antianxiety and pain medications. Except for diuretics, men use cardiovascular medications at an earlier age than do women. The use of medications for chronic conditions increases with older age categories for both genders. The use of female hormones represents only a small proportion of the difference in medication use between genders.

CONCLUSIONS

Analysis of data from the epidemiologic literature suggests that the gender differences in medication use shown in this study generally are to be expected.

Pre-hospital aspirin for suspected myocardial infarction and acute coronary syndromes: a headache for paramedics?

OBJECTIVE

To ascertain the frequency with which paramedics follow protocols for the administration of aspirin to patients to whom an ambulance is called for chest pain associated with suspected ischaemic heart disease.

METHODS

Ambulance services in England and Wales who had conducted a recent aspirin administration audit were identified through the National Clinical Effectiveness Programme for the Ambulance Service Association. Data were requested from each of these services with a 100% return rate.

RESULTS

Nine services out of a total of 35 had collected appropriate data. The proportion of patients who were given aspirin by a paramedic varied from 11% to 74%. The range of proportions of patients receiving pre-hospital aspirin increased after adding those patients who had already received aspirin from an alternative health provider, to 19% to 78%. It is estimated that at least 15% to 74% of patients who should have been given aspirin by the various ambulance services did not receive it. The proportion of patients for whom aspirin was judged to be inappropriate ranged from 4% to 35%. The reason for these widely varying and generally poor levels of compliance is not known. However, the range of indications and contraindications to the administration of aspirin varied considerably by ambulance service. This also made the comparison of data from different sources difficult.

CONCLUSIONS

Aspirin has been shown to be beneficial after a myocardial infarction and for other acute coronary syndromes. However, variances in the proportion of patients with suspected ischaemic heart disease given aspirin in different ambulance services indicates the need for a re-emphasis on the importance of this treatment. A standard protocol for all UK ambulance services should be devised that minimises the number of contraindications to aspirin and otherwise requires its administration to all patients with acute coronary syndromes or suspected myocardial infarction. Regular, standardised audits of compliance should also be conducted and their results widely disseminated.

Coronary Artery Disease in Postmenopausal Women

Many important developments recently have been made in the treatment and prevention of coronary artery disease (CAD) in postmenopausal women. Substantial evidence supports focusing on comprehensive risk factor modification based on the "ABCs" of CAD management from the American College of Cardiology, the American Heart Association, and the American College of Physicians-American Society of Internal Medicine guidelines on chronic stable angina. This approach emphasizes cardiovascular risk factor interventions that include antiplatelet agents, angiotensin-converting enzyme (ACE) inhibitors, beta-blockers, cholesterol-lowering medications, diabetes control, and counseling on diet and exercise. Despite the expanding available literature, many questions on CAD in postmenopausal women remain unanswered and await the publication of ongoing and future research. The unexpected findings from the HERS (Heart and Estrogen/progestin Replacement Study) failed to show a benefit of hormone replacement therapy (HRT) in reducing the risk of subsequent events in postmenopausal women with CAD, and instead reported an early increase in CAD events. Based on the data available so far, we advise against starting HRT in postmenopausal women with a recent coronary event for the sole purpose of CAD prevention. For women with acute coronary syndromes, prompt angiography and revascularization should be considered.