|Year : 2016 | Volume
| Issue : 3 | Page : 78-83
Risk factor profile and disease pattern in premenopausal and postmenopausal Indian women presenting with acute coronary syndrome
Biji Soman MBBS, MRCP (UK), D.Card 1, Muneer A Rahaman MD, D.Card, FESC 2, Rajesh Rajan MD, PhD, D.Card, FESC, FACC, FAHA 3, Govindan Vijayaraghavan MD, DM, FRCP (Lond), FRCP (Edin), FACC, FAHA 2
1 Department of Cardiology, Sree Uthram Thirunal Royal Hospital, Kochulloor, Kerala, India
2 Department of Cardiology, Kerala Institute of Medical Sciences, Thiruvananthapuram, Kerala, India
3 Department of Cardiology, Amiri Hospital, Kuwait City, Kuwait
|Date of Web Publication||26-Sep-2016|
Meditrina Hospital, Pallikkal (PO), Kottarakara - 691 566, Kerala
Source of Support: None, Conflict of Interest: None
Introduction: More women die of cardiovascular diseases than from any other illness. Evaluation of coronary artery disease (CAD) among premenopausal women has been neglected, since it is been considered to be rare. The purpose of this study was to compare the risk factor profile for CAD in premenopausal and postmenopausal Indian women presenting with acute coronary syndrome.
Materials and Methods: This retrospective study was carried out at the Department of Cardiology, in a tertiary care cardiac center in Trivandrum, Kerala, India. Clinical and risk factor data were collected by reviewing hospital records. Coronary angiograms were assessed by two independent cardiologists.
Results: A total of 232 patients were included in the study, of which 66 were in the premenopausal group with mean age of (45.85 ± 4.25) years, and 166 in the postmenopausal group with mean age of (67.40 ± 6.40) years. The incidence of hypertension (31 [46.96%] vs. 133 [80.12%], P < 0.001) and diabetes mellitus (28 [42.42%] vs. 104 [62.65%], P < 0.005) was higher among the postmenopausal women. ST elevation myocardial infarction was significantly higher (5 [7.57%] vs. 31 [18.67%], P = 0.035) among postmenopausal women. Coronary angiography showed that the premenopausal women had higher incidence of angiographically normal coronaries (27 [40.90%] vs. 37 [22.29%], P = 0.004), whereas postmenopausal women had more atherosclerotic triple vessel disease (7 [10.60%] vs. 46 [27.71%], P = 0.005).
Conclusions: The CAD in premenopausal women is mostly nonatherosclerotic and nonobstructive. The conventional risk factors do not play a significant role among this subset of population.
Keywords: Acute coronary syndrome, coronary artery disease, premenopausal women, risk factors
|How to cite this article:|
Soman B, Rahaman MA, Rajan R, Vijayaraghavan G. Risk factor profile and disease pattern in premenopausal and postmenopausal Indian women presenting with acute coronary syndrome. J Clin Prev Cardiol 2016;5:78-83
|How to cite this URL:|
Soman B, Rahaman MA, Rajan R, Vijayaraghavan G. Risk factor profile and disease pattern in premenopausal and postmenopausal Indian women presenting with acute coronary syndrome. J Clin Prev Cardiol [serial online] 2016 [cited 2019 Dec 16];5:78-83. Available from: http://www.jcpconline.org/text.asp?2016/5/3/78/191098
| Introduction|| |
Unlike the rest of the world, the incidence of coronary artery disease (CAD) is on the rise in India, and the disturbing factor is that it is becoming more common among younger age groups.  Even though the men are more often affected, the women are not far behind. Evaluation of acute coronary syndrome (ACS) in premenopausal women has been overlooked, despite it being the leading killer of women in this age group, outpacing even breast cancer. 
The purpose of this study was to compare the risk factor profile for CAD in premenopausal and postmenopausal Indian women presenting with ACS.
| Materials and Methods|| |
This retrospective study was carried out at the Department of Cardiology, in a Tertiary Care Centre in Trivandrum, Kerala, India.
All female patients admitted over a 2-year period from 2012 January with chest pain and electrocardiography changes consistent with ischemic changes, and those who consented for undergoing coronary angiography (CAG) for diagnostic and/or revascularization purposes were included in the study. Cardiac troponin I was the biomarker used for the diagnosis of ACS. ACS was classified as myocardial infarction with either STEMI or non-STEMI (NSTEMI) based on the universal definition of myocardial infarction,  and unstable angina if there was evidence of ischemic chest pain occurring at rest or recent onset severe angina or had a crescendo pattern with no rise in cardiac biomarkers.
As the incidence of ACS was nonexistent in the female population under 30 years of age, patients under the age of 30 years, or with renal failure, postcoronary artery bypass graft status, and with any other contraindication for CAG, were excluded from the study. Also excluded were women between 50 and 60 years of age to allow for the weaning off of residual beneficial effect of circulating endogenous estrogen postmenopausal.
Collection of baseline risk factor data, including menstrual status, was done from the hospital records and also by obtaining relevant and detailed medical history from the patients. Since none of the patients from either group had smoking history, other conventional risk factors including diabetes mellitus (DM), hypertension, dyslipidemia, thyroid illness, and family history for premature CAD as per the American College of Cardiology/American Heart Association guidelines definitions were assessed in this study. Because of insufficient data nutritional status and obesity could not be assessed. The clinical presentations of patient were categorized as unstable angina and myocardial infarction as explained above.
Elective CAG was performed through standard femoral or radial artery approach. Angiographic data were collected by analyzing the angiograms by two interventional cardiologists. CAD was defined as >1 epicardial coronary segment with stenosis >50% and was diagnosed visually. All analyses were performed using Statistical Package for Social Sciences (SPSS) Version 16.0 (IBM) and Statistica software, version 12 (Statsoft, DELL). Results were expressed as mean ± standard deviation (SD) for numerical variables and frequencies and percentages for categorical variables in the forms of tables. Chi-squared P values below 0.05 were considered statistically significant.
| Results|| |
Of the 232 patients who were evaluated 66 were in the premenopausal group with age (range: 35-50 years) and mean of 45.85 ± 4.25 years (mean ± SD) and 166 were in the postmenopausal group with age (range: 60-94 years) mean age of 67.40 ± 6.40 years (mean ± SD), those in between 50 and 60 were excluded to allow for the weaning off of residual beneficial effect of endogenous estrogen postmenopausal. Upon comparing the risk factor profile [Table 1], it showed that 31 (46.96%) patients suffered from hypertension in the premenopausal age group, whereas the number was 133 (80.12%) in the postmenopausal age group; similarly, 28 (42.42%) and 104 (62.65%) women, respectively, had DM, 19 (28.78%) and 56 (33.73%) had dyslipidemia, 17 (25.75%) and 34 (20.48%) had history of thyroid illness, and 11 (16.66%) and 21 (12.65%) had family history for premature CAD. There was statistically significant association between age and history of hypertension (P < 0.001) and DM (P < 0.005), with greater incidence of heart transplant (HT) (31 [46.96%] vs. 133 [80.12%], P < 0.001) and DM (28 [42.42%] vs. 104 [62.65%], P < 0.005) in the postmenopausal group. Postmenopausal women have 0.367 and 0.558 times greater risk of CAD when compared to premenopausal women with hypertension and DM, respectively. There was statistically significant association between CAD and history of hypertension (95% confidence interval [CI] 0.248-0.544, P < 0.001) and DM (95% CI 0.369-0.844, P < 0.005) in the postmenopausal group.
We further subdivided the premenopausal subset to have a closer look at the risk factor profile in the premenopausal age group [Table 2], we found that there was statistically significant association between the age and prevalence of systemic hypertension (2 [20%] vs. 29 [51.78%] P = 0.063) and DM (1 [10%] vs. 27 [48.21%] P = 0.024), with the association between the increasing age and DM being statistically significant. Interestingly, when we analyzed the pattern of the risk factor profile in the latter decade more closely [Table 3], we found that there was not much statistical significance in the incidence of DM (4 [40%] vs. 23 [50%], P = 0.566), whereas hypertension had significantly higher incidence in the above 45 age group (2 [20%] vs. 27 [58.69%], P = 0.026), inferring that diabetes occurs earlier than hypertension among premenopausal women. Occurrences of other risk factors were similar in both age groups. It was also observed that the conventional risk factors occurred with greater frequency as the age increased.
We also looked at the clinical presentation and initial diagnosis at presentation [Table 4] and found that more than three-fourth of the patients with ACS in the premenopausal age group presented with unstable angina 51 (77.27%) as against 112 (67.46%) in the postmenopausal group. There was statistically significant difference in the presentation with STEMI between the two groups (5 [7.57%] vs. 31 [18.67%], P = 0.035).
|Table 4: Clinical presentation and initial diagnosis of the study population |
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Comparing the CAG [Table 5] revealed that 3% of the postmenopausal patients had left main stem (LMS) stenosis and nobody in the premenopausal group had LMS disease. The premenopausal women tended to have statistically significant percentage of angiographically normal coronaries (27 [40.90%] vs. 37 [22.29%], P = 0.004) and that postmenopausal women had more number of multi vessel disease, with statistically significant difference in the occurrence of triple vessel disease (TVD) (7 [10.60%] vs. 46 [27.71%], P = 0.005). Significantly higher incidence of nonatherosclerotic coronary lesions (muscle bridge) (7 [10.60%] vs. 5 [3.01%], P = 0.018) were seen among premenopausal women.
| Discussion|| |
In 2011, CVD caused one death per minute among women.  That represents about the same number of female deaths from cancer, chronic lower respiratory disease, and DM combined. 
Risk factors for ACS and CAD vary among men and women. Atypical presentation in women with vague and more generalized complaints makes it more difficult to diagnose CAD. ,, Incidence of CAD in the young is much higher among Indians as compared to the Westerns, (12-16% vs. 5%). ,
There is increasing evidence of age and gender disparity and also a lack of effective communication about heart disease risk factors and risk factor modification, even among patients with documented risk factors, particularly young women. ,
Hypertension and DM are the two major risk factors for CAD in women. 
In our study also, HT and DM along with dyslipidemia were the major risk factors to cause CAD; however, they were more prevalent among the postmenopausal women, also the percentage of women having HT and DM in the premenopausal group was significantly higher after 45 years of age. The proportion of patients with none of the above conventional risk factors and still having CAD was significantly higher in the premenopausal group signifying that there are factors other than the conventional risk factors contributing to the CAD of the young women.
Hypertension (71%) was the most common risk factor in our study as was observed in other studies. , Hypertension is associated with 4-fold increased risk of ischemic heart disease (IHD) in females. ,
In our study, 57% females were diabetic, similar association of diabetes with IHD was observed in various other studies. ,, Diabetes carries a greater risk in females, as it is associated with platelet abnormalities, endothelial dysfunction in addition to negating the protective effects of estrogen. 
The coronary angiographic profile revealed a distinct difference in the pattern of CAD between the premenopausal and postmenopausal women, with greater incidence of angiographically normal epicardial coronaries in the premenopausal women, suggesting nonatherosclerotic pathology. Even in those with significant coronary lesions, single vessel disease was more common among premenopausal women, while among the postmenopausal women, multi-vessel disease was the norm, with majority of them having TVD.
Atherosclerotic burden is greater in postmenopausal women than premenopausal women as understood from the higher prevalence of obstructive CAD, especially multivessel disease in postmenopausal group  and that of normal epicardial coronaries in premenopausal group. In our study, the prevalence of multivessel disease (DVD and TVD) was 47.6% among postmenopausal women and 19.7% of premenopausal women had nonobstructive CAD and 41% had angiographically normal epicardial coronaries. Premenopausal women have lower incidence of IHD due to the protective effect of endogenous estrogen on the vascular endothelium,  whereas in the postmenopausal women, the risk of IHD doubles. ,
Many studies have found that the presence of obstructive CAD is less likely among women, when compared with men who undergo CAG. , Normal or nonobstructive CAD is more commonly seen in younger premenopausal women, who may not have the conventional cardiac risk factors. , More than 50% of these women with normal or nonobstructive CAD on CAG continue to have signs and symptoms of ischemia and do undergo repeat hospitalization and end up having repeat CAG at a later stage. ,
The National Heart, Lung, and Blood Institute-sponsored Women's Ischemia Syndrome Evaluation study revealed that women with nonobstructive coronary disease and evidence of myocardial ischemia have a relatively poor prognosis compared with women with nonobstructive coronary disease and no myocardial ischemia.  In spite of this, majority of the patients with normal or nonobstructive CAD are offered only reassurance. 
A lot of fallacies remain in treatment and prevention of IHD in women. Both the CRUSADE registry in UA/NSTEMI  and NRMI-1 investigators  in STEMI showed that compared to men, lesser number of women with CAD received the standard protocol medications for ACS and there was also delay in the use of fibrinolytic therapy. On their part, women defaulted from continuing the secondary prevention drugs for long-term, particularly aspirin, statins, and angiotensin-converting enzyme inhibitors. Women present more often with atypical symptoms, this coupled with their lack of awareness of the disease and the physicians' low awareness about the CAD in women often leads to misdiagnosis of CAD. 
In spite of a difference in risk factor profile and disease presentation, women in India continue to be treated based on the treatment guidelines and protocols based on trials which had predominantly males. ,
As reported in the VIRGO study, the importance of improved risk identification, clinical management, and patient education for adult women age ≤55 years, should be emphasized at all levels of healthcare interventions. 
Since the risk factor profile, pathology as well as the pattern of CAD is different in the premenopausal women, the treatment plan need to be different for this subset of the population and the management strategy needs to be tailor made for this population. It clearly shows that the preventive measures to reduce the CAD burden needs to be started at an earlier age and needs to be multipronged.
Ours is a single center retrospective study and we included only those patients who came to the department with ACS, there was disparity in the baseline characteristics of the two groups studied, this is no way represents the true burden of the disease in the population and hence, our results may not be interpreted as the true reflection of the CAD in the population. Majority of our patients were the local population and as such they would not be representing the diverse disease pattern of the Indian population. Intravascular ultrasound (IVUS), optical coherence tomography or fractional flow reserve was not used in this study.
| Conclusion|| |
Our study revealed that the incidence of ACS among premenopausal Indian women is not as rare as has been perceived thus far. The risk factor profile may be same but there was a distinct difference in their prevalence in the two groups, the positive association of hypertension, DM, dyslipidemia, and CAD with increasing age was quite apparent. The study highlighted DM, hypertension, and dyslipidemia as major risk factors and also as potential targets for prevention. Majority of the premenopausal women presented with unstable angina and the incidence of MI (STEMI and NSTEMI) was much less. Even though the risk factors were the same, premenopausal women have a lower prevalence of obstructive CAD compared with postmenopausal women with similar symptoms and they had high incidence of angiographically normal epicardial coronaries, favoring vascular dysfunction, micro vascular coronary lesions, and more cases of nonatherosclerotic coronary lesions. Even among those with obstructive CAD, premenopausal women had fewer multi-vessel diseases, probably because of the protective effect of the endogenous circulating estrogen.
Women above the age of 30 years have CAD producing symptoms; however, these symptoms are often mistaken for noncardiac chest symptoms. The threshold for investigating young and middle aged women for CAD have to be brought down, so that the precise diagnosis is made possible. Identification of co-morbidities and risk factors of CAD in women will lead us to the correct diagnosis and early appropriate management. Noninvasive tests such as stress echocardiography and perfusion testing with cardiac magnetic resonance or single-photon emission computed tomography imaging should be used in identifying patients at risk, followed by further risk stratification by appropriate invasive testing such as CAG.
Better understanding of the risk factor profile, clinical presentation, and response to treatment is needed before devising an effective management plan for CAD in premenopausal women.
We would like to thank and acknowledge the contribution of Ms. Greeshma C Raveendran, biostatistician, in helping us with the advanced statistical analysis.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]