|Year : 2019 | Volume
| Issue : 3 | Page : 166-170
Evaluation of Serum Vitamin D Level as a Prognostic Marker in the Clinical Manifestation of Acute Coronary Syndrome Patients
Hiren Anghan1, Jayesh Prajapati1, Iva Vipul Patel2, Senthilraj Thangasami1, Nikunj Patel1
1 Department of Cardiology, U. N. Mehta Institute of Cardiology and Research Center, Civil Hospital Campus, Ahmedabad, Gujarat, India
2 Department of Research, U. N. Mehta Institute of Cardiology and Research Center, Civil Hospital Campus, Ahmedabad, Gujarat, India
|Date of Submission||18-Jun-2019|
|Date of Decision||28-Jul-2019|
|Date of Acceptance||01-Sep-2019|
|Date of Web Publication||20-Dec-2019|
Dr. Jayesh Prajapati
Department of Cardiology, U. N. Mehta Institute of Cardiology and Research Center, Civil Hospital Campus, Asarwa, Ahmedabad - 380 016, Gujarat
Source of Support: None, Conflict of Interest: None
Introduction: Epidemiologic studies have shown a strong association between Vitamin D deficiency and cardiovascular risk factors, myocardial infarction, and all-cause cardiovascular mortality. The purpose of this study was to determine the clinical implications of serum Vitamin D levels in an unselected cohort of acute coronary syndrome (ACS) patients at the time of hospital admission. Methods: This was a prospective observational study which enrolled a total of 310 patients from December 2015 to March 2018. The consecutive in-hospital patients with ACS diagnosed by the typical history of angina, electrocardiography changes, with or without cardiac enzymes were included in the study. The primary endpoint of the study was all-cause death during hospitalization. The secondary endpoint was the in-hospital incidence of major adverse cardiac events (MACEs). Results: The number of patients with diabetes and dyslipidemia was significantly higher in the Vitamin D-deficient group (46.7%, P = 0.04 and 45.4%, P = <0.001, respectively). The blood glucose, hemoglobin A1C, low-density lipoprotein, and total cholesterol were significantly higher in Vitamin D-deficient group (P = 0.045, 0.048, 0.013, and 0.024, respectively). There was no any relation of mortality and MACE between normal Vitamin D and Vitamin D deficiency patients. Conclusion: Vitamin D deficiency and insufficiency were common in patients with the ACS. In the current study, ACS patients with diabetes and dyslipidemia were strongly associated with Vitamin D deficiency, but there was no correlation between Vitamin D deficiency and ACS outcomes.
Keywords: Acute coronary syndrome, diabetes, dyslipidemia, Vitamin D deficiency
|How to cite this article:|
Anghan H, Prajapati J, Patel IV, Thangasami S, Patel N. Evaluation of Serum Vitamin D Level as a Prognostic Marker in the Clinical Manifestation of Acute Coronary Syndrome Patients. J Pract Cardiovasc Sci 2019;5:166-70
|How to cite this URL:|
Anghan H, Prajapati J, Patel IV, Thangasami S, Patel N. Evaluation of Serum Vitamin D Level as a Prognostic Marker in the Clinical Manifestation of Acute Coronary Syndrome Patients. J Pract Cardiovasc Sci [serial online] 2019 [cited 2020 Jan 25];5:166-70. Available from: http://www.j-pcs.org/text.asp?2019/5/3/166/273736
| Introduction|| |
Cardiovascular diseases (CVDs) are the most prevalent health problems that lead to extended mortality and morbidity worldwide. Many traditional risk factors for the prognosis of coronary artery disease (CAD) exist; however, multiple novel risk factors have been assessed by previous studies and remain to be a subject of controversy for their interaction and relation involved in the pathophysiology of CVD. Recently, Vitamin D deficiency was found to be the potential risk factor for underlying CVD. Around one billion people have been found to suffer from Vitamin D deficiency. Hence, the research has shifted over the role of Vitamin D level in the pathophysiology of CVD. The prevalence of Vitamin D deficiency in India has been estimated to be 50%–90% according to earlier studies.
Vitamin D has a fundamental role in bone metabolism, and calcium homeostasis may also influence several other conditions including CVD. Moreover, Vitamin D deficiency has been linked to conditions such as hypertension, diabetes mellitus, metabolic syndrome, cardiac hypertrophy, and chronic kidney disease, which are also risk factors for CVDs.,,,,, Epidemiologic studies have shown a strong association between Vitamin D deficiency and not only CVD risk factors but also myocardial infarction and all cause including cardiovascular mortality.,,, Shanker et al. showed that patients in the lower Vitamin D quartile had a higher risk for CAD; they did not find an association with the severity of CAD. Levels of 25(OH) D in healthy volunteers are independently associated with various measures of endothelial function, arterial stiffness, and coronary flow reserve. In a subgroup of participants with Vitamin D deficiency, normalization of 25(OH) D levels at 6 months was associated with a significant increase in reactive hyperemia indices (monitoring endothelium-dependent relaxation). Similarly, in other studies, treatment with Vitamin D improved arterial stiffness (pulse wave velocity).
The purpose of this study was to determine the clinical implications of 25-hydroxy (OH) D levels in an unselected cohort of acute coronary syndrome (ACS) patients at the time of hospital admission and its possible association with in-hospital complications including morbidity and mortality. To do so, we have evaluated the plasma Vitamin D level and the correlation of plasma Vitamin D level as a prognostic marker with the clinical outcomes in patients with ACS.
| Methods|| |
This was a prospective observational study enrolled a total of 310 patients from December 2015 to March 2018. The consecutive in-hospital patients with ACS diagnosed by the typical history of angina, electrocardiography changes, with or without cardiac enzymes were included in the study. ACS patients who had acute ST-segment elevation myocardial infarction (STEMI) were diagnosed according to third universal definition of myocardial infarction. We have also enrolled patients with a history of ischemic heart diseases. ACS patients with chronic kidney disease, valvular heart disease, chronic heart disease, liver cirrhosis, alcoholic liver disease, use of corticosteroids and rifampicin, and patients who failed to give written consent were excluded from the study. The study was approved by the institutional ethics committee UNMICRC/CARDIO/2015/81.
Procedure and data collection
The detailed history, previous medications, another baseline, and demographic data have been collected from patients at the time of enrollment. Patients were followed up at the scheduled and unscheduled visits at the department of cardiology.
For all the enrolled patients, a venous blood sample was collected at the time of hospital admission for biological measurement of 25(OH) D level. Architect 25-OH Vitamin D assay (Abbott Diagnostics, Wiesbaden, Germany), with a limit of detection of 7 ng/ml, was used for serum 25(OH) D measurement. The cutoff values for classifying Vitamin D status were >30 ng/mL were considered normal Vitamin D level; between 29 and 21 ng/mL were classified as Vitamin D insufficiency, and <20 ng/mL as Vitamin D deficiency.,,, All patients received standard medical treatment and coronary revascularization on the basis of the current standards of care recommended by published guidelines.
The primary endpoint of the study was all-cause death during hospitalization. The secondary endpoint was the in-hospital incidence of major adverse clinical events (MACEs). The MACE included major bleeding requiring a blood transfusion, acute pulmonary edema (with or without the need for mechanical ventilation), cardiogenic shock, clinically significant tachyarrhythmias (ventricular fibrillation, sustained ventricular tachycardia, and atrial fibrillation), and bradyarrhythmias (requiring pacemaker implantation and acute kidney injury).
The data analysis was done with “IBM SPSS version 20” (IBM Corp., New York, USA).
Quantitative variables are expressed as the mean ± standard deviation, and qualitative variables were expressed as a percentage (%). A comparison of parametric values between groups was performed using the independent sample t-test. Categorical variables were compared using the Chi-square test. A nominal significance was taken as a two-tailed P < 0.05.
| Results|| |
The baseline characteristics of the study population were stratified according to normal, insufficient, and deficient Vitamin D level as shown in [Table 1]. The baseline characteristics did not differ statistically between the three groups. There was no gender difference in Vitamin D deficiency in our study population.
[Table 2] shows the relation of different cardiac risk factors with Vitamin D value. The number of patients with diabetes and dyslipidemia was significantly (P = 0.04; P ≤ 0.001) higher in the Vitamin D-deficient group.
[Table 3] presents the laboratory profile of patients according to Vitamin D levels. The blood glucose, hemoglobin A1C (HbA1C), low-density lipoprotein (LDL), and total cholesterol (T. CHL.) increased consecutively within the three groups and were significantly (P = 0.045, 0.048, 0.013, and 0.024) higher in Vitamin D-deficient group, as represented in [Table 3].
The relations of the severity of left ventricular ejection fraction (LVEF) and vessel involvement with the level of Vitamin D are shown in [Figure 1]. The severity of LVEF was higher in patients with Vitamin D deficiency. [Figure 2] presents the number of blocked vessels involved with Vitamin D deficiency was higher compared to the normal Vitamin D value patients, but there was no significant correlation between the degree of vessel involvement in ACS and the level of Vitamin D.
|Figure 2: Vessels involved. SVD: Single vessel disease, DVD: Double vessel disease, TVD: Triple vessel disease.|
Click here to view
Furthermore, the relation between the incidence of a major adverse cardiac event (MACE) and the level of Vitamin D is represented in [Table 4]. There was no significant difference in the incidences of MACE and the level of Vitamin D.
| Discussion|| |
The present study reported that the majority (82.9%) of the enrolled patients with ACS were Vitamin D deficient, which confirms that ACS patients constitute Vitamin D deficiency. Moreover, our study found that patients with cardiovascular risk factors such as diabetes and dyslipidemia were Vitamin D deficient. It was further supported by the significantly higher blood levels of glucose, Hba1c, LDL, and T. CHOL. in Vitamin D-deficient patients. However, we found no significant correlation between in-hospital complications, death, and MACE in ACS patients with Vitamin D level.
In the current study of 310 patients, 62% had STEMI, 16.7% had non-STEMI (NSTEMI), and 21.3% had unstable angina. This was supported by Indian study which evaluated the clinical profile of ACS patients in the tertiary care center and reported 76% of STEMI, 18.2% of NSTEMI, and 5% of unstable angina patients.
Dziedzic et al. reported that in a group of ACS patients with diabetes, the lowest Vitamin D level was exhibited. In the present study, 46.7% and 35.1% diabetic ACS patients were diagnosed with Vitamin D deficiency and insufficiency, respectively, and the difference was clinically significant (P = 0.047). Moreover, the level of blood glucose (P = 0.045) and HbA1c (P = 0.048) was significantly higher in Vitamin D insufficient and deficient groups.
Gagnon et al. found that the mean serum concentration of Vitamin D in diabetic patients was lower than the nondiabetic individuals.
In our study, 63.4% of patients with Vitamin D deficiency had severe left ventricular dysfunction (LVD) compared to 31.5% of patients with normal Vitamin D level who had severe LVD. The difference was statistically significant (P = 0.04). The results were supported by Khademvatani et al. published in 2017.
The higher T. CHL. and LDL levels are a high-risk factor for CVDs. In the present study, we found that the level of Total Cholesterol and LDL were significantly (P = 0.024 & P = 0.013 respectively) higher in patients with Vitamin D deficiency group and increased gradually from normal to Vitamin D deficient group. The study conducted by Wang et al. found that Vitamin D deficiency is positively associated with T. CHL.(β coefficient = 0.35, P < 0.002) and inversely associated with triglyceride (β coefficient = −0.24, P < 0.001) and LDL (β coefficient = −0.34, P < 0.001). The fact is further supported by the study done by Dziedzic et al. studying the effects of Vitamin D on the severity of coronary artery atherosclerosis and lipid profile of cardiac patients. They found significant (β = −0.13, P ≤ 0.05) inverse relation between 25(OH) D level and hyperlipidemia (hyperlipidaemia was defined as T. CHL. >200 mg/dl or triglyceride >150 mg/dl).,
The previous review suggested that deficient Vitamin D level potentiates atherosclerosis by increasing vascular inflammation, endothelial dysfunction, and proliferation of smooth muscle cells. The multivariate analysis study conducted by Wang et al. reported that Vitamin D deficiency is a potential and a graded risk factor for CVD. These findings may potentially broaden the public health, given the high prevalence of Vitamin D-deficient population.
Vitamin D deficiency is associated with the risk of mortality.,, In our study, among 257 Vitamin D-deficient patients, 20 (7.7%) died. The rate of mortality was not statistically significant between the groups. It was probably due to the small sample size enrolled in our study. In addition, in our study, no correlation was evident between Vitamin D level and age as well as gender. A similar observation was reported by Karur et al. who stated that no significant heterogeneity was observed between Vitamin D deficiency and age or gender, but it was more commonly seen in those with lower socioeconomic status, higher cholesterol level, in dyslipidemias and diabetic patients.
Limitation of the study
While interpreting the results, limitations of the study should be considered. First, the small sample size included in the study was underpowered to detect in-hospital mortality. Second, the study was conducted in a single large high volume tertiary care center; hence, the results might not be applicable to the general population. Third, we studied only in-hospital outcomes, and no follow-up was done. Fourth, factors such as latitude, season, sunlight exposure, skin color, and serum albumin affect Vitamin D status, which was not taken into account in the study.
| Conclusion|| |
Vitamin D deficiency and insufficiency were common in patients with the ACS. In the current study, diabetic and dyslipidemic ACS patients were strongly associated with Vitamin D deficiency; however, there was no correlation between Vitamin D deficiency and MACE. Further, large, multicenter, studies are needed to assess the relationship between Vitamin D level and ACS and its long-term prognosis. Such confirmation is required in interventional trials with Vitamin D supplementation.
The study is approved by the institutional ethics committee.
Financial support and sponsorship
This study was financially supported by U. N. Mehta Institute of Cardiology and Research Centre, Ahmedabad, Gujarat, India.
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2]
[Table 1], [Table 2], [Table 3], [Table 4]