International Journal of Current Research and Review
ISSN: 2231-2196 (Print)ISSN: 0975-5241 (Online)
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IJCRR - 4(20), October, 2012

Pages: 134-138

Date of Publication: 20-Oct-2012


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RATE PRESSURE PRODUCT - A DIAGNOSTIC TOOL IN DETERMINING THE CARDIOVASCULAR RISK IN POSTMENOPAUSAL WOMEN

Author: Sangeeta Nagpal, Kalpana Gupta, Jitendra Ahuja

Category: Healthcare

Abstract:Objective: Rate pressure product (RPP) is an indirect measure of Myocardial oxygen consumption (MVO2).It increases progressively with exercise and the RPP at peak of exercise is Peak rate pressure product (PRPP). The low value of PRPP suggests significant compromise of coronary perfusion. In the present study effect of exercise on RPP of Pre menopausal women and Post menopausal women were compared. Research Design and Methods: The study was conducted on a total of 50 healthy volunteer women. They were subjected to treadmill exercise test and baseline and maximum RPP was calculated. Results: The RPP in premenopausal women increased significantly from 10.83 \? 2.11 to 28.98 \? 2.93 mm of Hg beats / min x 10-3 during exercise and in postmenopausal from 12.52 \? 2.69 to 28.03 \? 4.14. The percentage increase in RPP was significantly more in Premenopausal women (63%) as compared to postmenopausal women (55%). Conclusions: It can be concluded that Rate pressure product reaches the critical value before the symptoms appear and the percentage increase in Rate pressure product was less in postmenopausal women. The results also suggest that the measurement of Peak rate pressure product in response to exercise can detect Coronary Artery Disease (CAD) even before the appearance of clinical signs and symptoms in postmenopausal women and thus can be used as a diagnostic tool.

Full Text:

INTRODUCTION
Menopause is a period used to express the permanent cessation of the prime function of the human ovaries, the ripening and release of ova and the release of hormones that cause both the creation of the uterine lining and the subsequent shedding of the uterine lining. Menopause signals the end of the fertile phase of a woman's life. Menopause has a wide starting range, but can usually be expected in the age range of 42–58(1). Menopause is associated with increased risk of Coronary Artery Disease (CAD) due to loss of cardio protective effect of estrogen. Estrogen deficient state affects myocardial efficiency by enhancing cardiovascular response to mental stress, by changing lipid profile, decreasing vascular reactivity (2) and by increasing homocysteine levels (3). Moreover there is accelerated cell death in the aging myocardium leading to depletion of functional myocytes that decreases the contractile performance (4) Myocardial oxygen consumption (MVO2) is a good indicator of the response of the coronary circulation to increased oxygen demand. Coronary blood flow (CBF) increases in direct proportion to the myocardial oxygen requirements. Thus the determinants of MVO2 are also the determinants of CBF (5). Direct measurement of MVO2 is difficult in routine clinical practice but it can be easily measured indirect methods like stroke work, Fick’s principle ,the tension time index and rate pressure product (RPP) (6) RPP is the product of heart rate and systolic blood pressure. It reflects the work of the heart and correlates well with MVO2 .It is calculated as [RPP = Heart rate (HR) x Systolic blood pressure (SBP) / 1000].The value is divided by 1000 to make the number more manageable. (7). It increases with the increase of stress or work load on the heart. It is a simple non invasive easily measurable index, which defines the response of coronary circulation to myocardial metabolic demand. It is a good index of MVO2in patients with ischemic heart disease (8). It has been shown that in any particular patient with CAD, the onset of angina appears at a constant RPP. Most patients would complaint of some pain at a constant RPP of 20,000. (9) Rate pressure product is also called as Robinson index (10). The internal myocardial work performed is represented by RPP and external myocardial work performed is generally expressed as stages of exercise. Many comparative studies have been done to know the influence of hormones on hemodynamic parameters in postmenopausal women but there are few reports on the effect of exercise on RPP in postmenopausal women. Hence this study was designed to evaluate the effect of exercise on RPP in postmenopausal women and determine the importance of RPP in the diagnosis and the prevention of CAD in postmenopausal women. MATERIAL AND METHODS The present study was done to access the cardiovascular performance in postmenopausal women by measuring various hemodynamic parameters like Heart rate, Systolic blood pressure and Rate pressure product. The study was conducted in 50 volunteer women. They were divided into two groups. The Group A consisted of 25 healthy postmenopausal women with no systemic disorder and Group B consisted of 25 postmenopausal women with and no systemic disorder .the study protocol was approved by the Institutional ethics committee. Written informed consent was taken from all the volunteers before enrollment. The study included recording of anthropometric parameters like age, height and weight. All the subjects were first thoroughly examined and those having systemic disease were excluded. The baseline heart rate, systolic blood pressure and ECG were recorded. SBP was recorded by auscultatory method. .Baseline RPP was calculated. RPP, which is the product of systolic blood pressure and heart rate, was computed as (7): RPP = SBP in mm Hg x HR beats /min x 10-3 Exercise stress test was performed on Treadmill, which is the most commonly used dynamic exercise device for this test. The subject was subjected to graded exercise. The treadmill is started at a relatively slow speed. The treadmill speed (km/hr) and its grade of slope (%) or inclination are increased every three minutes according to a preprogrammed protocol. Bruce protocol is the commonest protocol used. The protocol dictates the precise speed and slope of treadmill. According to this, each three minute interval is called as a stage. The treadmill is set with the stage I, speed (2.74km/hr) and grade of slope (10%) and subject commences the test. At the appropriate times during the test, the speed and slope of treadmill are adjusted. So after 3 minutes, the speed is adjusted to 4.02km/hr and slope to 12%. After 6 minutes, the speed is adjusted to 5.47km/hr and slope to 14%. The subject was made to run on a treadmill till exhaustion. Treadmill exercise variables of HR, SBP and ECG were determined. The ECG was constantly displayed on the monitor. It was also recorded on paper at one minute interval. The patient’s blood pressure was recorded during second minute of each stage. The maximum RPP was calculated. The maximum RPP at maximum exercise is called as Peak RPP (PRPP). The exercise test is said to be maximal when the subject appears to give true maximal effort i.e. Effort done to the point of body exhaustion or when other clinical end points are reached. The exercise stress test was terminated in the subjects if the target heart rate was achieved or they complained of fatigue. Exercise was also discontinued if there were abnormal changes like decrease in SBP of 10mm Hg along with evidence of ischemia, abnormal ECG pattern like ST segment displacement, appearance of arrhythmias, bundle branch block or if subject complains of chest pain.

Statistical analysis
Data was represented as mean and standard deviation (SD).Analysis was done using Student’s paired t-test and Wilcoxon Signed Ranks Test. Pvalue<0.05 was considered as statistically significant.

OBSERVATIONS AND RESULTS
The subjects of group A and Group B were comparable for demographic characteristics (Table I). The mean age of Group A was 40 years and Group B was also 57 years.

 

All the baseline hemodynamic parameters were significantly more in healthy postmenopausal women as compared to healthy Premeopausal women. There was significant increase in SBP, HR and RPP during exercise in both the groups. The RPP in Group A increased significantly from 10.83 ± 2.11 to 28.98 ± 2.93 mm of Hg beats / min x 10-3 during exercise. Group B also showed a significant increase in RPP from 12.52 ± 2.69 to 28.03 ± 4.14. The percentage increase in RPP was significantly more in Premeopausal women (63%) as compared to postmenopausal women (55%). Maximum HR was significantly less in group B as compared to group A. The percentage increase in HR was significantly more in Premeopausal women (59%) as compared to Premeopausal women (43%). There was no statistically significant difference in percentage change in SBP between the groups. DISCUSSION Abnormal hemodynamic response to exercise may indicate an increased risk of CAD, even if signs and symptoms of ischemia are absent. Both HR and SBP are important variables determining changes in myocardial oxygen consumption between rest and exercise (9).During exercise HR, SBP and RPP increases with increase work load on the heart to provide adequate blood supply to the active myocardium. All the hemodynamic parameters increase significantly with exercise in both the groups. This is due to increase in sympathetic discharge during exercise(11,12) .RPP increases progressively with exercise and attained the peak value of 28.98 ± 2.93 mm Hg x beats per minute x 10-3 in premenopausal women and 28.03± 4.14 in postmenopausal women. The percentage increase in RPP was significantly less in postmenopausal women (55%) as compared to premenopausal women (63%). The less percentage increase in postmenopausal women is due to age related depletion of functional myocytes, cardiac receptors and increased myocardial stiffness that decreases the ventricular pumping and cardiovascular response of the heart to exercise. (13) Angina results from imbalance between oxygen supply and demand and is precipitated due to increase in work of myocardium to a critical level which is fixed in each patient. The work of the myocardium is measured by RPP. Most normal individuals develop a RPP of 20 to 35 mm Hg x beats / min x 10-3 . In many patients with significant Ischemic Heart Disease, RPP value exceeding 25 mm Hg x beats / min x 10-3 are unusual (14). Studies reported the rate pressure product exceeding 22,000 is commonly associated with myocardial ischemia and angina (9). In the present study the PRPP was 28.98 and 28.03 mm Hg x Beats / min x 10-3 in pre menopausal women and post menopausal women respectively. The percentage increase in RPP was 63% in premenopausal women and 55% in postmenopausal women. The peak RPP is an accurate reflection of the myocardial oxygen demand and myocardial work load. The higher the RPP, the higher will be the MVO2. The ability to reach high RPP is associated with more adequate coronary perfusion. Reaching the high RPP without symptoms or evidence of severe ischemia suggests adequate left ventricular functions and the low value of PRPP suggests significant limitation of coronary perfusion and decreased LV function leads to angina. . Maximum RPP is reported to range from 10th percentile value of 25,000 to a 90th percentile of 40,000(15). RPP exceeding 22 is commonly associated with myocardial ischemia and angina (8). Both HR and SBP are also useful in the diagnosis of ischemic heart disease in postmenopausal women. In our study there was a significant increase in HR and SBP in both the groups during exercise. The percentage increase in SBP was comparable in both the groups. On the other hand the percentage increase in HR was significantly less in postmenopausal women as compared to premenopausal women. The less increase in HR is due to age related depletion of cardiac myocytes which has been proposed as a mechanism for decreased contractile performance and decrease hemodynamic responses (3). The baseline HR, SBP and RPP were more in postmenopausal women than premenopausal women. It may be attributed due to marked sympathetic activation and decrease parasympathetic activity due to low estrogen. The increased sympathetic activation in postmenopausal women is due to endothelial dysfunction Also with menopause, there is increased level of vasoconstriction and oxidative stress. All these factors contribute to hyperkinetic circulation characterized by elevated HR and SBP. Menopause also increases aortic stiffness.

CONCLUSION
Results from this study indicate that HR x SBP, easily measurable hemodynamic parameters are valid predictors of MVO2 during exercise in a population of postmenopausal women. It can be concluded that RPP reaches the critical value before the symptoms appear and the percentage increase in RPP was less in postmenopausal women. The results also suggest that the measurement of PRPP in response to exercise can detect CAD even before the appearance of clinical signs and symptoms in postmenopausal women and thus can be used as a diagnostic tool.

ACKNOWLEDGEMENT
We acknowledge the immense help received from the scholars whose articles are cited and included in references of this manuscript. We are also grateful to authors / editors / publishers of all those articles, journals and books from where the literature for this article has been reviewed and discussed.

References:

1. Sekarbabu Hariram, Sowmya S, Hamsalatha P, Gayathri G, Priyadarsini C, Thiripurasundari M, Saranya, Vivekanand P .Screening the Clinical Parameters in Menopause Women. Research Journal of Pharmaceutical, Biological and Chemical Sciences. July – September 2011; 2:1065.

2. Ariyo AA, Villablanca AC. Can HRT, designerestrogens and phytoestrogens reduce cardiovascular risk markers after menopause? Postgraduate Medicine: Estrogens and Lipids2002; 111: 23–30.

3. Kamellian R.Dimitrova, Kerry DeGroot, Adam K. Myers, Young D. Kim Estrogen and homocysteine. Cardiovascular research 2002; 53: 577-588

4. Torella D, Rota M, Nurzynska D et al. Cardiac stem cell and myocyte aging, heart failure, and insulin-like growth factor-1 overexpression CircRes 2004; 94: 514–524.

5. John Ross, Jr. Cardiovascular system. In: Best and Taylor’s physiological basis of medical practice. West JB(Ed).12th edition. New Delhi: B.I .Waverly Pvt. Ltd; 1990 p. 265.

6. Sarnoff SJ, Braunwald E. Hemodynamic determinants of oxygen consumption of heart with special reference to the tension-time index .Am J Physiol 1958; 192: 148-156.

7. Navalta JW, Sedlock DA, Park K-S. Physiological responses to downhill walking in older and younger individuals. Journal of exercise physiology 2004;7(6):45-51

8. Zargar JA, Naqash IA, Gurcoo SA, Mehraj-UdDin. Comparative evaluation of the effect of metoprolol and esmolol on rate pressure product and ECG changes during laryngoscope and endotracheal intubation in controlled hypertensive patients. Indian J Anaesth 2002; 46: 365-368.

9. Robinson B F. Relation of heart rate and systolic blood pressure at the onset of pain in angina pectoris. Circulation 1967; 35:1073- 1083

10. Siegelova J, Fier B, Duek J, Placheta Z, Cornelissen G, Halberg F.Circadian variability of rate pressure product in essential hypertension with enalpril therapy. Scripta Medica (Brno) 2000; 72:67-75.

11. Ellestad MH. Stress testing.4th edition. New Delhi: Jaypee Bothers; 1996 p. 17.

12. Ellestad MH. Stress testing.4th edition. New Delhi: Jaypee Bothers; 1996 p. 379.

13. Sussman MS, Anversa P.Myocardial aging and senescence. Ann Rev Physiol 2004; 66:29-47

14. Chaitman BR .Exercise stress testing. In: Heart disease: A Textbook of Cardiovascular Medicine. Braunwald E, Zipes DP, Libby P (eds).6th ed.Philadelphia: WB Saunders; 1997 p.153-157.

15. Fletcher GF, Cantwell JD, Watt EW. Oxygen consumption and hemodynamic response pf exercises used in training of patients with recent myocardial infarction. Circulation 1979; 60:140-144.

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Dr. Pramod Kumar Manjhi joined Editor-in-Chief since July 2021 onwards

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Awards, Research and Publication incentive Schemes by IJCRR

Best Article Award: 

One article from every issue is selected for the ‘Best Article Award’. Authors of selected ‘Best Article’ are rewarded with a certificate. IJCRR Editorial Board members select one ‘Best Article’ from the published issue based on originality, novelty, social usefulness of the work. The corresponding author of selected ‘Best Article Award’ is communicated and information of award is displayed on IJCRR’s website. Drop a mail to editor@ijcrr.com for more details.

Women Researcher Award:

This award is instituted to encourage women researchers to publish her work in IJCRR. Women researcher, who intends to publish her research work in IJCRR as the first author is eligible to apply for this award. Editorial Board members decide on the selection of women researchers based on the originality, novelty, and social contribution of the research work. The corresponding author of the selected manuscript is communicated and information is displayed on IJCRR’s website. Under this award selected women, the author is eligible for publication incentives. Drop a mail to editor@ijcrr.com for more details.

Emerging Researcher Award:

‘Emerging Researcher Award’ is instituted to encourage student researchers to publish their work in IJCRR. Student researchers, who intend to publish their research or review work in IJCRR as the first author are eligible to apply for this award. Editorial Board members decide on the selection of student researchers for the said award based on originality, novelty, and social applicability of the research work. Under this award selected student researcher is eligible for publication incentives. Drop a mail to editor@ijcrr.com for more details.


Best Article Award

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A Study by Varsha M. Shindhe et al. entitled "A Study on Effect of Smokeless Tobacco on Pulmonary Function Tests in Class IV Workers of USM-KLE (Universiti Sains Malaysia-Karnataka Lingayat Education Society) International Medical Programme, Belagavi" is awarded Best article of Vol 12 issue 14, July 2020
A study by Amruta Choudhary et al. entitled "Family Planning Knowledge, Attitude and Practice Among Women of Reproductive Age from Rural Area of Central India" is awarded Best Article for special issue "Modern Therapeutics Applications"
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A Study by Kannamani Ramasamy et al. entitled "COVID-19 Situation at Chennai City – Forecasting for the Better Pandemic Management" is awarded best article for  Vol 12 issue 12
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A study by Mithun K.P. et al "Larvicidal Activity of Crude Solanum Nigrum Leaf and Berries Extract Against Dengue Vector-Aedesaegypti" is awarded Best Article for Vol 10 issue 14 of IJCRR
A study by Asha Menon "Women in Child Care and Early Education: Truly Nontraditional Work" is awarded Best Article for Vol 10 issue 13
A study by Deep J. M. "Prevalence of Molar-Incisor Hypomineralization in 7-13 Years Old Children of Biratnagar, Nepal: A Cross Sectional Study" is awarded Best Article for Vol 10 issue 11 of IJCRR
A review by Chitra et al to analyse relation between Obesity and Type 2 diabetes is awarded 'Best Article' for Vol 10 issue 10 by IJCRR. 
A study by Karanpreet et al "Pregnancy Induced Hypertension: A Study on Its Multisystem Involvement" is given Best Paper Award for Vol 10 issue 09

List of Awardees

A Study by Ese Anibor et al. "Evaluation of Temporomandibular Joint Disorders Among Delta State University Students in Abraka, Nigeria" from Vol 13 issue 16 received Emerging Researcher Award


A Study by Alkhansa Mahmoud et al. entitled "mRNA Expression of Somatostatin Receptors (1-5) in MCF7 and MDA-MB231 Breast Cancer Cells" from Vol 13 issue 06 received Emerging Researcher Award


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Disclaimer: International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal.



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International Journal of Current Research and Review (IJCRR) provides platform for researchers to publish and discuss their original research and review work. IJCRR can not be held responsible for views, opinions and written statements of researchers published in this journal

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