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ORIGINAL RESEARCH article

Front. Cardiovasc. Med., 02 June 2023
Sec. Cardiovascular Pharmacology and Drug Discovery

Risk factors for heart, cerebrovascular, and kidney diseases: evaluation of potential side effects of medications to control hypertension, hyperglycemia, and hypercholesterolemia

  • Hitotsubashi Institute for Advanced Study (HISA), Hitotsubashi University, Kunitachi, Japan

Background: Heart disease (HD), cerebrovascular disease (CBD), and kidney disease (KD) are serious diseases worldwide. These diseases constitute the leading causes of death worldwide and are costly to treat. An analysis of risk factors is necessary to prevent these diseases.

Data and Methods: Risk factors were analyzed using data from 2,837,334, 2,864,874, and 2,870,262 medical checkups obtained from the JMDC Claims Database. The side effects of medications used to control hypertension (antihypertensive medications), hyperglycemia (antihyperglycemic medications), and hypercholesterolemia (cholesterol medications), including their interactions, were also evaluated. Logit models were used to calculate the odds ratios and confidence intervals. The sample period was from January 2005 to September 2019.

Results: Age and history of diseases were found to be very important factors, and the risk of having diseases could be almost doubled. Urine protein levels and recent large weight changes were also important factors for all three diseases and made the risks 10%–30% higher, except for KD. For KD, the risk was more than double for individuals with high urine protein levels. Negative side effects were observed with antihypertensive, antihyperglycemic, and cholesterol medications. In particular, when antihypertensive medications were used, the risks were almost doubled for HD and CBD. The risk would be triple for KD when individuals were taking antihypertensive medications. If they did not take antihypertensive medications and took other medications, these values were lower (20%–40% for HD, 50%–70% for CBD, and 60%–90% for KD). The interactions between the different types of medications were not very large. When antihypertensive and cholesterol medications were used simultaneously, the risk increased significantly in cases of HD and KD.

Conclusion: It is very important for individuals with risk factors to improve their physical condition for the prevention of these diseases. Taking antihypertensive, antihyperglycemic, and cholesterol medications, especially antihypertensive medications, may be serious risk factors. Special care and additional studies are necessary to prescribe these medications, particularly antihypertensive medications.

Limitations: No experimental interventions were performed. As the dataset was comprised of the results of health checkups of workers in Japan, individuals aged 76 and above were not included. Since the dataset only contained information obtained in Japan and the Japanese are ethnically homogeneous, potential ethnic effects on the diseases were not evaluated.

1. Introduction

Heart disease (HD), cerebrovascular disease (CBD), and kidney disease (KD) are serious diseases. Ischemic HD (IHD), stroke (a type of CBD), and KD were the leading, second-leading, and tenth-leading causes of deaths globally in 2019, respectively (1). The World Health Organization (WHO) estimated (1) that IHD caused 8.9 million or 16% of the world's total deaths, stroke caused 6.2 million deaths, approximately 11% of the total deaths, and the deaths caused by KD totaled 1.3 million in 2019.

In the United States, HD, CBD (stroke), and KD were the leading, fifth leading, and tenth-leading causes of death in 2020. They caused 696,962 (20.6%), 160,264 (4.7%), and 52,547 (1.6%) deaths, respectively (percentages of total deaths are listed in parentheses) (2).

In Japan, HD, CBD, and KD were the second-, fourth-, and eighth-leading causes of death in 2020 (3). They caused 205,596 (15.0%), 102,978 (7.5%), and 26,948 (2.0%) deaths in 2020, respectively (percentages of total deaths are listed in parentheses). The medical expenditures in fiscal year 2019 (4) were 2.09 trillion yen for HD, 1.83 trillion yen for CBD, and 1.66 trillion yen for KD, respectively. These medical expenditures accounted for 12.6% of the total Japanese national medical expenditure of 44.39 trillion yen.

The American Heart Association (AHA) (5) described the risk factors for coronary HD. The major risk factors are classified into three categories: (i) non-modifiable risk factors that cannot be changed; (ii) modifiable risk factors that can be modified, treated, or controlled; and (iii) other factors that contribute to HD risks. Non-modifiable risk factors include age, sex, and heredity (including race). Modifiable risk factors include tobacco smoking, high blood cholesterol, total cholesterol, triglycerides, high blood pressure or hypertension, physical inactivity, obesity, being overweight, and diabetes. Other factors included stress, alcohol consumption, diet, and nutrition. Centers for Disease Control and Prevention (CDC) (6) described that the risk factors for HD and stroke are high blood pressure, low-density lipoprotein (LDL) cholesterol, diabetes, smoking and secondhand smoke exposure, obesity, unhealthy diet, and physical inactivity.

High blood pressure (BP) or hypertension is considered a major risk factor for HD or cardiovascular disease (CVD). Fuchs and Whelton (7) noted that hypertension had the strongest evidence of causation among the risk factors for CVD. The American College of Cardiology (ACC), AHA, and other organizations (8) presented a new guideline (the 2017ACC/AHA guideline) for hypertension in 2017. Under the new guideline, the criteria for hypertension lowered to 130/80 mmHg (SBP ≥ 130 or DBP ≥ 80 mmHg) from 140/90 mmHg (SBP 140 or DBP  90 mmHg) of the JNC7 guideline settled in 2003 (9). Nawata (10) reported that 14.0% and 38.0% were classified as having hypertension according to the 140/90 and 130/90 mmHg criteria, respectively. Muntner et al. (11) mentioned that the 2017 ACC/AHA guideline would increase medication use and reduce the prevalence of CVD.

Many studies have analyzed the relationship between high BP or hypertension [especially high systolic BP (SBP)] and HD or CVD (1223). Although most of these studies indicated that hypertension is a risk factor for HD and CVD, some questioned the relationship between them (13, 1820, 22, 23).

Risk factors for CBD (stroke) are classified as non-modifiable and modifiable factors. The American Stroke Association (ASA) (24) stated that nonmodifiable risk factors include age, family history, race, gender, prior stroke history, transient ischemic attack (TIA), and heart attack. Modifiable risk factors include high BP, smoking, diabetes, diet, physical inactivity, obesity, high blood cholesterol, artery disease, peripheral artery disease, atrial fibrillation, and sickle cell disease. Various studies have been conducted on CBD (2531). In case of CBD, long-term rehabilitation frequently becomes a serious problem in addition to prevention, detections, and treatment (25, 26, 30).

Furthermore, CDC (32) described diabetes and high BP as two important risk factors for chronic KD (CKD). HD, obesity, family history of CKD, inherited kidney disorders, past kidney damage, and older age were other risk factors. The American Kidney Fund (33) mentioned that diabetes is a leading risk factor, and high BP and race or ethnicity are other important risk factors. The Kidney Foundation of Canada (34) also mentioned that diabetes, high BP, and a family history of KD are risk factors. Since KD, especially CKD, is a serious global burden (35), many studies on its risk factors (3640) and treatment procedures have been conducted (4146). CKD is a costly disease to treat. Liyanage et al. (42) reported that “renal replacement therapy (RRT), through either dialysis or renal transplantation, is a lifesaving yet high-cost treatment for people with end-stage kidney disease.” Although the results of cost-effectiveness analyses (4751) suggest that renal transplantation is more efficient than dialysis, few renal transplantations have been performed in Japan. The number of kidney transplantations in the United States (52) was 23,642 in 2020. In contrast, the numbers in Japan (53) were 216 and 127 in the fiscal years 2019 and 2020, respectively, and the number of dialysis patients (54) was 347,641 at the end of 2020. Nawata and Kimura (55) reported that the medical cost of an individual with KD was 14.5 times higher than that of an individual without KD.

In the present study, the risk factors for HD, CBD, and KD were analyzed using the JMDC Claims Database (56), which includes 13,157,681 medical checkups performed on 3,233,271 individuals in Japan. The side effects of medications to control hypertension (antihypertensive medications), hyperglycemia (antihyperglycemic medications), and hypercholesterolemia (cholesterol medications) on these diseases were also evaluated.

2. Data, design of the study and models

2.1. Data

In Japan, most employees aged 40 years or older undergo mandatory medical check-ups at least once a year under the Industrial Safety and Health Act. Younger employees and their family members may voluntarily undergo medical checkups. The JMDC Claims Database is a nationwide health information database that collects data from various health insurance societies and includes 13,157,681 medical check-ups obtained from 3,233,271 individuals from January 2005 to September 2019. The database contains various health information, including HD, CBD, and KD histories.

2.2. Design of the study and models

In this study, not only conventional risk factors but also the effects of antihypertensive, antihyperglycemic, and cholesterol medications were analyzed using logit (logistic regression) models.

In the rest of the paper, taking antihypertensive medications is referred to as “with antihypertensive medications” and not taking medications is referred to as “without antihypertensive medications.” This phrasing is similarly used for the other medications. Table 1 shows the percentages of observations with histories of HD, CBD, and KD classified as with and without medications. The percentages having disease histories of individuals with medications are several times larger than those without medications, as shown in “Ratio (a/b)” and “95% CI” [95% confidence intervals (CIs) are calculated using the formula given in Appendix A]. For HD history, the ratio of the percentages is 6.88 with a 95% CI of 6.82–6.94 between individuals with and without BP medications.

TABLE 1
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Table 1. Percentages of observations having HD, CBD, and HD histories by taking medications or not.

However, we cannot say that taking medications increases the probability of developing diseases from these facts. If an individual once had these diseases, the medications would be continuously prescribed for treatment and recurrence prevention purposes afterward. Therefore, causality problems (i.e., diseases are causes, and prescriptions of medications are results) must be considered in the analysis. The following methods were used to avoid causality problems.

For the analysis of HD, individuals who had HD history data at both years t and t + 1, no HD history at year t (“without HD history” hereafter), and had data (either positive or negative) concerning HD at year t + 1 (i.e., the following year) were selected, and the same selection methods were used for CBD and KD. Logit (logistic regression) models were used for the analysis.

Define:

HDt (dummy variable) is 1 if an individual has a HD history at year t and 0 otherwise,

CBDt (dummy variable) is 1 if an individual has a CBD history at year t and 0 otherwise, and

KDt (dummy variable) is 1 if an individual has a KD history at year t and 0 otherwise.

We use the following three models in which HDit+1, CDit+1 and KDit+1 are the dependent variables.

The basic design of the model is the models given by

P[yt+1|yt=0]=Λ(xtβ)(1)

where yt is a variable representing a disease history, Λ is the distribution function of the logistic distribution given by Λ(ω)=exp(ω)1+exp(ω), and xt is a vector of covariates at t. It may be possible to extend the model to Λ(s=0kxitsβs). However, this model is not practical. As k increases, (i) the number of observations decreases, (ii) the number of parameters increases, (iii) since most covariates take the same or similar values at t-1, t-2,…t-k, multicollinearity becomes a serious problem, and (iv) the portion of individuals stayed in the same company for long years increases; that may cause a sample selection bias.

Nawata (23, 57) evaluated the risk factors of HD and CBD; however, the histories of other diseases and interactions of medications were not considered. Since some individuals simultaneously take two or more different types of medications, interactions between medications are very important issues to consider. Their effects were also evaluated in these models. The following models (Models A, B and C) were considered in the analysis.

Basic model:

P[yt+1=1|yt=0]=Λ(β1+β2Age+β3Female+β4t1+β5BMI+β6SBP+β7DBP+β8B_Sugar+β9HbA1c+β10HDL+β11LDL+β12Triglyceride+β13ALT+β14AST+β15GGP+β16U_Sugar+β17U_Protein+β18Smoke+β19Alcohol_Freq+β20Alcohol_Amount+β21Weight_1+β22Weight_20+β23Eat_Fast+β24Late_Supper+β25No_Breakfast+β26Exercise+β27Activity+β28Speed+β29Sleep+β30M_BP+β31M_Glucose+β32M_Cholestrol+β33M_BP&GL+β34M_BP&CH+β35M_GL&CH+β36M_BP&GL&CH+β37z1t+β38z2t)(2)

Model A (HD model):

yt+1=HDt+1,yt=HDt,z1t=CBDtandz2t=KDt.(3)

Model B (CBD model):

yt+1=CBDt+1,yt=CBDt,z1t=HDtandz2t=KDt.(4)

Model C (KD model):

yt+1=KDt+1,yt=KDDt,z1t=HDtandz2t=CBDt(5)

All covariates are values at t, and the subscript t is omitted in the covariates except HDt, CBDt, and HDt. The definitions of variables other than disease history are as follows:

Age (age of an individual),

Female (dummy variable) is 1 if female and 0 if male,

Family (dummy variable) is 1 if a family member and 0 otherwise,

t1 (time trend) year – 2004,

BMI (body mass index) weight (kg)/[height (m)]2,

SBP (systolic blood pressure) mmHg,

DBP (diastolic blood pressure) mmHg,

B_Sugar (blood sugar) mg/dl,

HbA1c (hemoglobin A1c) %,

HDL (high-density lipoprotein cholesterol) mg/dl,

LDL (low-density lipoprotein cholesterol) mg/dl,

Triglyceride (serum triglyceride level) mg/dl,

ALT (alanine aminotransferase) units per liter (U/L),

AST (aspartate aminotransferase) U/L,

GGP (γ-glutamyl transferase) U/L,

U_Sugar (urine sugar; integers of 1–5) is 1 if undetected, 2 if around 50 mg/dl, 3 if around 100 mg/dl, 4 if around 250 mg/dl, and 5 if around 500 mg/dl or over,

U_Protein (urine protein; integers of 1–5) is 1 if undetected, 2 if around 15 mg/dl, 3 if around 30 mg/dl, 4 if around 100 mg/dl, and 5 if 250 mg/dl or over,

Smoke (dummy variable) is 1 if with smoking habit and 0 otherwise,

Alcohol_Freq (frequency of alcohol intake; integer 0–2) is 0 if never, 1 if sometimes, and 2 if every day,

Alcohol_Amount (amount of alcohol intake; integer 0–3) is 0 if none, 1 if drinking less than 180 ml of Japanese sake wine (with an alcohol percentage of about 15%) or equivalent alcohol per day when drinking, 2 if drinking 180–360 ml, 3 if drinking 360–540 ml, and 4 if drinking 540 ml or more,

Weight_1 (dummy variable) is 1 if weight changed by 3 kg or more in a year and 0 otherwise

Weight_20 (dummy variable) is 1 if weight increased by 10 kg or more from age 20 and 0 otherwise,

Eat_Fast (dummy variable) is 1 if eating faster than other people and 0 otherwise,

Late_Supper (dummy variable) is 1 if eating supper within two hours of bedtime three times or more in a week and 0 otherwise,

No_Breakfast (dummy variable) is 1 if not eating breakfast three times or more in a week and 0 otherwise,

Exercise (dummy variable) is 1 if exercising for 30 min or more twice or more in a week for more than a year and 0 otherwise,

Activity (dummy variable) is 1 if performing physical activities (walking or equivalent) for one hour or more daily and 0 otherwise,

Speed (dummy variable) is 1 if walking faster than other people of a similar age and the same gender and 0 otherwise, and

Sleep (dummy variable) is 1 if sleeping well and 0 otherwise.

In addition to these variables, the following dummy variables representing medication use were used to evaluate the side effects of medications.

M_BP (dummy variable) is 1 if taking antihypertensive medications to control BP only (not taking other types of medications) and 0 otherwise,

M_Glucose (dummy variable) is 1 if taking antihyperglycemic medications to control glucose (including insulin injections) only and 0 otherwise,

M_Cholestrol (dummy variable) is 1 if taking cholesterol medications to control cholesterol (including triglycerides) only and 0 otherwise,

M_ BP & GL (dummy variable) is 1 if taking two types of medications (antihypertensive and antihyperglycemic medications) and 0 otherwise,

M_ BP & CH (dummy variable) is 1 if taking two types of medications (antihypertensive and cholesterol medications) and 0 otherwise,

M_ GL & CH (dummy variable) is 1 if taking two types of medications (antihyperglycemic and medications) and 0 otherwise, and

M_ BP & GL & CH (dummy variable) is 1 if taking three types of medications (antihypertensive, antihyperglycemic, and cholesterol medications) and 0 otherwise.

The estimation is done by the following steps. First, observations with yt=0 and yt+1=0or1 are selected where yt is a variable representing a disease history. Then the observations with missing values of covariates are excluded. 2,837,334 (0:99.452%; 1:0.558%), 2,864,874 (0:99.771%; 1:0.299%) and 2,870,262 (0:99.876%; 1:0.120%) observations satisfy these criteria for Models A, B and C, respectively. The logit models are estimated using these observations. The design of the study is summarized in Figure 1. The summary of the covariates of 2,795,932 observations used in all models is given in Table 2. Table 7 in Appendix B is the list of abbreviations used in the study.

FIGURE 1
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Figure 1. Flow chart of the study. NA, not available.

TABLE 2
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Table 2. Summary of covariates.

3. Results of estimation

The estimation results of Model A (HD model) are presented in Table 3. The gross percentage of HD patients in the following year was 0.55% among individuals without HD history. The estimate of Age was positive, and its t-value was quite large and significant at any reasonable significance level. The estimates for Female, Family, and t1 were negative and significant at the 1% level. The estimates for HbA1c, AST, U_Protein, and Weight_1 were positive and significant at the 1% level. The estimates of HDL, LDL, ALT, and Sleep were negative and significant at the 1% level. The estimates of CBDt and KDt were positive and significant at any reasonable level. The estimates of all dummy variables that represent medication use were positive, and their t-values were quite large and significant at any reasonable significance level. In particular, when antihypertensive medications were included, the estimated values were 0.657, 0.595, 0.793, and 0.784 for M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH, respectively. These values were much larger than those obtained without antihypertensive medications.

TABLE 3
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Table 3. Results of estimation: model A (HD model).

Table 4 shows the results of the estimation of Model B (CBD model). The gross percentage of those with CBD in the following year was 0.23%. The estimate of Age was positive, and its t-value was quite large and significant at any reasonable significance level. The estimates for DBP, GGP, U_Protein, and Weight_1 were positive and significant at the 1% level. In contrast, the estimates of Speed and Sleep were negative and significant at the 1% level and that of LDL was significant at the 5% level. The estimates of HDt and KDt were positive and significant at any reasonable level. The estimates of all dummy variables that represent medication use were positive, and their t-values were quite large and significant at any reasonable significance level. In particular, when antihypertensive medications were used, the estimated values were much higher than those without antihypertensive medications.

TABLE 4
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Table 4. Results of estimation: model B (CBD model).

The estimated results for Model C (KD model) are listed in Table 5. The percentage of patients with KD in the following year was 0.12%. Again, the estimate of Age was positive and its t-value was quite large and significant at any reasonable significance level. The estimate of t1 was positive and significant at the 1% level, while that of Female was negative and significant at the 5% level. The estimates of U_Protein and Weight_1 were positive and significant at the 1% level, and those of U_Sugar and Late_Supper were significant at the 5% level. The estimates of BMI, HbA1c, ALT, Smoke, Drink_Freq, and Activity were negative and significant at the 1% level. The estimates of HDt and CBDt were positive and significant at any reasonable significance level. As in the previous two models, the estimates of all dummy variables that represent medication use were positive and significant at any reasonable significance level. Especially, for the variables with antihypertensive medications, the estimates of M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH were 1.01, 1.17, 1.30, and 1.27, respectively. These estimates were almost twice as large as those obtained without antihypertensive medications.

TABLE 5
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Table 5. Results of estimation: model C (KD model).

4. Discussion

Table 6 summarizes the significant covariates other than disease histories and variables that represent taking medications in Models A (HD model), B (CBD model), and C (KD model). As expected, Age is a very important variable affecting these diseases. As shown in Figure 2, the odds ratios (ORs) comparing individuals aged 50–70 years were 2.09 with a 95% confidence interval (CI) of 2.01–2.18 for HD, 2.27 with a 95% CI of 2.12–2.41 for CBD, and 1.34 with a 95% CI of 1.22–1.45 for KD. Although Nawata (23) evaluated the risk factors for HD, the ORs and CIs were not evaluated. Since the probabilities of having these diseases in the next year are small, OR and CI are approximately equal to the probability ratio (PR) and its CI (57). The risk of HD and CBD in individuals aged 70 years is more than twice as large as those of individuals aged 50 years. The increase in risk was relatively small for KD. Female is significant at the 1% level in Model A but not significant at the 5% level in other models.

FIGURE 2
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Figure 2. Odds ratios and 95% confidence intervals of Age (Age 50 vs. Age 70) in three models.

TABLE 6
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Table 6. Significant variables and the signs of estimates in three models.

Weight_1 (recent weight change) and U_Protein (urine protein level) were significant at the 1% level in all models and were considered important variables. Figure 3 shows the ORs and 95% CIs of these variables for the models. For the dummy variable, the OR was calculated by comparing 0 and 1. For U_Protein, the majority of the values were 1 or 2, so the OR was calculated by comparing U_Protein = 1 and 2. For HD, the ORs of U_Protein and Weight_1 (95% CI) were 1.10 (1.0–1.13) and 1.20 (1.15–1.24.) For CBD, the ORs were1.13 (1.08–1.17) and 1.24 (1.17–1.31). For KD, the ORs were 2.23 (2.20–2.31) and 1.21 (1.11–1.30). Weight_1 increased the risk by approximately 20% for all diseases. U_Protein increased the risk by about 10% for HD and CD; however, it doubled the risk for KD. U_Protein is a risk factor with obvious mechanisms assumed (58) and people with high urine protein levels should recognize this fact, and special attention is necessary.

FIGURE 3
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Figure 3. Odds ratios and 95% confidence intervals of U_Protein and Weight_1 in three models.

Another interesting finding is that among BP levels (SBP and DBP), only DBP in the CBD model was significant, and the estimates were not significant in the other models. This may raise questions regarding the 2017ACC/AHA guideline, which lowered the hypertensive criterion.

Figure 4 shows the ORs and 95% CIs for the variables of a history of other diseases. In the HD model, the ORs were 1.72 (1.54–1.89) and 1.71 (1.35–2.06) for CBDt and KDt. In the CBD model, the ORs were 2.15 (1.93–2.36) and 2.17 (1.61–2.74) for HDt and KDt. In the KD model, the ORs were 1.57 (1.34–1.81) and 1.58 (1.27–1.89) for HDt and CBDt. The risk of having CBD for individuals with HD and KD histories was especially high, more than double of those without disease histories, and special care is necessary for them (57).

FIGURE 4
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Figure 4. Odds ratios and 95% confidence intervals of disease histories (HDt, CBDt and KDt) in three models.

All medications (antihypertensive, antihyperglycemic, and cholesterol-lowering) increased the risk of all three diseases. Figures 57 show ORs and 95% CIs, respectively. People often take two or three types of medications, and seven different variables are separately shown in the figures. These variables were divided into two groups. One group was treated with antihypertensive medications (i.e., M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH), and the other was without antihypertensive medications (i.e., M_GL, M_CH, and M_GL&CH). In the HD model, the ORs (95% CI) were 1.93 (1.83–2.02), 1.81 (1.59–2.04), 2.21 (2.06–2.36), and 2.19 (1.93–2.45) for M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH, respectively. In contrast, the ORs were 1.26 (1.10–1.43), 1.41 (1.31–1.52), and 1.29 (1.07–1.51) for M_GL, M_CH, and M_GL&CH. In the former group, the risks associated with antihypertensive medications were almost double compared with those without medications. In the latter group, the increments were much smaller, approximately 25%–40%.

FIGURE 5
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Figure 5. Odds ratios and 95% confidence intervals of medications in the HD model.

FIGURE 6
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Figure 6. Odds ration and 95% confidence interval of medications in the CBD model.

FIGURE 7
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Figure 7. Odds ratios and 95% confidence intervals of medications in the KD model.

In the CBD model, the ORs (95% CI) were 1.89 (1.75–2.04), 2.15 (1.77–2.53), 2.20 (1.98–2.43), and 2.17 (1.79–2.55) for M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH, respectively. In contrast, the ORs were 1.47 (1.18–1.86), 1.66 (1.49–1.84), and 1.62 (1.22–2.02) for M_GL, M_CH, and M_GL&CH. In the former group, the risks associated with medications were almost double compared to those without medication, as in the case of heart disease. In the latter group, the increments were about 50%–65%. The results of this study suggest that antihypertensive medications increase the risks of HD and CBD, and the statement of Muntner et al. (11) is not supported.

Concerning the KD model, the ORs (95% CI) were 2.75 (2.46–3.93), 3.22 (2.44–4.01), 3.69 (3.20–4.18), and 3.59 (2.77–4.41) for M_BP, M_BP&GL, M_BP&CH, and M_BP&GL&CH, respectively. In contrast, the ORs were 1.76 (1.22–2.31), 1.61 (1.35–1.88), and 1.93 (1.17–2.68) for M_GL, M_CH, and M_GL&CH. In the KD mode1, although the CIs were larger, the increments in the risks seem much higher than those of the previous two diseases. The risks triple (or increase more) in the first group. The increments were about 60%–70% in the second group. Especially in the first group, even the lower bounds of the 95% CIs, the risks become 2.4–3.2 times larger than those without medications. This may imply that the negative effects of antihypertensive medications are much more serious in patients with KD.

The interactions between medications are important issues when individuals use two or more different types of medications. In the models without antihypertensive medications, the 95% CIs of M_GL and M_CH overlapped with the CI of M_GL&CH, and no significant interaction effect was observed. However, when antihypertensive and cholesterol medications were used simultaneously (M_ BP & CH), the risks were significantly higher (i.e., the 95% CIs did not overlap) than those using only antihypertensive medications (M_BP) in the HD and KD models.

Not only are the values of estimates of antihypertensive medications much higher than those of the other medications but the use of antihypertensive medications is also higher than that of other medications (antihypertensive medications: 11.18%, antihyperglycemic medications: 3.21%, and cholesterol medications: 7.46%). Here, we mainly discuss antihypertensive medications. For possible interpretations of the positive estimates, see Nawata (23).

Although there are some alternative therapies such as renal denervation (59), prescribing antihypertensive medications is a major therapy for hypertension. Over 200 drugs are available globally (60). Jackson and Bellamy (61) classified these medications into two group. One group is being those which directly or indirectly block the renin–angiotensin system (RAS) and the other group works through non-RAS pathways. The first group includes angiotensin-converting enzyme inhibitors (ACEIs), angiotensin-converting enzyme inhibitors, angiotensin receptor antagonists and direct renin inhibitors. The second group consists of adrenoceptor antagonists (β-blockers, α-blockers), calcium channel blockers, diuretics (thiazides, loop, potassium sparing/aldosterone antagonist), vasodilators, centrally acting agents, and ganglion block.

Laurent (62) also classified the medications into β-blockers, diuretics, ACEIs, angiotensin II receptor blockers (ARBs), calcium-channel blockers, and other classes. Although the information of individual prescription records is not available, ACIs and ARAs are most widely used antihypertensive medications in Japan (63). RAS is a regulator of blood volume, electrolyte balance, and systemic vascular resistance. For summaries of RAS in the management of hypertension, see Fountain et al. (64) and Lange-Jacobs et al. (65). RAS is an extreme complex system in playing hypertension, and the understanding of RAS has expanded tremendously over the last few decades (65). Crifciler and Haznedarouglu (66) outlined intersections of circulating and local angiotensin systems in the vascular pathobiological microenvironment of central nervous system.

Since antihypertensive medications are widely used, their mechanisms of action, effectiveness, proper usage methods, and side effects have been widely studied (6776). Lithell (67) reported that “both β-blockers and thiazide diuretics worsened insulin resistance and deteriorated lipoprotein metabolism. …These data may explain the unexpectedly high incidence of diabetes among hypertensive patients and the poor effect on risk for coronary heart disease in intervention trials.” Santos et al. (68) did systematic reviews to identify the possible pharmacogenetic implications for RAS-blocker medications in the hypertension-CKD scenario. They described that studies focusing on CKD were scarce. The CDC (77) and International Diabetes Foundation (78) described KD as a serious diabetes complication.

Marcum and Fried (79) mentioned that antihypertensive medications are frequently used in older adults with CKD, and the most common adverse drug events (ADEs) with antihypertensive use include acute kidney injury and antihypertensives, which may lead to medication errors and ADEs. Even in the Systolic Blood Pressure Intervention Trial (SPRINT) (16), which was heavily weighted in the 2017ACC/AHA guideline, it was admitted that “Rates of serious adverse events of hypotension, syncope, electrolyte abnormalities, and acute kidney injury or failure, …, were higher in the intensive-treatment group than in the standard-treatment group.” They also reported the percentages of the serious adverse events in both groups. These findings are consistent with the results of the present study. Although Ptinopoulou et al. (80) wrote that “it is now common knowledge that adequate blood pressure control is the most important factor for the preservation of renal function, so every drug that effectively lowers hypertension is believed to be renoprotective,” the findings of the paper do not support this statement. The risks of hypertensive medications were three times or more higher than those without medications for KD. Any medication may have negative side effects. In particular, the risk of KD is much higher for individuals taking antihypertensive medications. These medications must be prescribed with caution to minimize any negative side effect, and further studies are needed on the risks of antihypertensive medications.

We obtained slightly different results from those of previous studies. One possible reason might be a sample selection bias. In this study, we analyzed the general population. In other studies, special individuals with a high risk of diseases were analyzed. The rate of having heart diseases in the next year is about 0.5%. If the sample size is 10 thousand, the expected number of new patients is just 50 per year and it is sometimes difficult to get statistically significant results. In the SPRINT (16), they selected 9,361patients (4,678: intensive treatment; 4,683: standard treatment) at high risk for cardiovascular events. They admitted that “The lack of generalizability to populations … is a limitation.” Over 2.8 million observations were used in the study and the generalizability problem might be improved. For the theoretical details, see Nawata and Kimura (19).

5. Conclusion

In this study, the risk factors for heart, cerebrovascular, and kidney diseases (HD, CBD, and KD) were analyzed using data from 2,837,334, 2,864,874, and 2,870,262 medical checkups obtained from the JMDC claims database. The data of individuals who had no history of each disease at year t and had information in the following year were analyzed using the logit models. Among the health-related information, age was a very important risk factor. The histories of other types of diseases were also very important factors, and the risks of HD, CBD, and KD would increase when individuals had histories of other diseases.

Among other factors, urine protein levels and recent large weight changes were very important for all three diseases. For KD, the risk would be more than double for individuals with high urine protein levels, and these individuals should be aware of this fact to prevent KD.

The side effects of the medications, including interactions, were also evaluated. Taking antihypertensive medications increased the risk of disease. The negative side effects were especially severe when individuals were taking antihypertensive drugs. Antihypertensive medications are widely used. Although the 2017ACC/AHA guideline lowered the hypertensive criterion, special care and additional studies are necessary to prescribe these medications, particularly antihypertensive medications so as to minimize the negative side effects of medications.

As the dataset comprises the health checkups of workers in Japan, it does not include individuals aged 76 and above. Age is a very important factor in these diseases, and the risk of these diseases increases with age. Although no precise data are not available, it is indicated that adequate care and consideration should be given to antihypertensive medications for the elderly. It is also necessary to collect data on older adults. The dataset only contained information obtained in Japan. The Japanese are ethnically homogeneous, and potential ethnic effects on the diseases are not evaluated. This might be an advantage to examine factors such as effects of medications because underlying genetic influences might be small. However, we may get different results in other countries, and that is a limitation of this study. Further studies are needed for generalization of this study. These will be the subjects of future studies.

Data availability statement

Publicly available datasets were analyzed in this study. This data can be found here: JMDC Claims Database https://www.jmdc.co.jp/en/jmdc-claims-database/.

Ethics statement

This study was approved by the Institutional Review Board of Hitotsubashi University.

Author contributions

The author confirms being the sole contributor of this work and has approved it for publication.

Acknowledgments

This study is part of the research project “Basic research for exploring the ideal medical intervention after the advent of the new coronavirus” at the Research Institute of Economy, Trade and Industry (RIETI). The JMDC Claims Database was purchased by RIETI from the JMDC Cooperation for the project. The author would like to thank project leader Yoichi Sekizawa for his helpful cooperation. The author would also like to thank reviewers for thier helpful comments and suggestions.

Conflict of interest

The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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APPENDIX

Appendix A. Confidence intervalsThe confidence interval of the ratio of the two estimators is calculated using the following formula:
a^b^=a^b^a^b+a^bab=a^(1b^1b)+1b(a^a)(A.1)
a^(1b^1b)=a^bb^bb^=ab2(bb^)+op(n12).(A.2)

From (A.1) and (A.2), we get

a^b^ab=1b(a^a)+ab2(bb^)+op(n12)AN(0,ω)(A.3)
ω=(1b)2V(a^)+(ab2)2V(b^).

Appendix B. AbbreviationsThe following table is the list of abbreviations used in this paper.

TABLE 7
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Table 7. List of abbreviations (symbols and their meaning).

Keywords: heart disease, cerebrovascular disease, kidney disease, side effects of medications, antihypertensive medications

Citation: Nawata K (2023) Risk factors for heart, cerebrovascular, and kidney diseases: evaluation of potential side effects of medications to control hypertension, hyperglycemia, and hypercholesterolemia. Front. Cardiovasc. Med. 10:1103250. doi: 10.3389/fcvm.2023.1103250

Received: 18 January 2023; Accepted: 22 May 2023;
Published: 2 June 2023.

Edited by:

Xiao Huang, Second Affiliated Hospital of Nanchang University, China

Reviewed by:

Takahiko Nagamine, Sunlight Brain Research Center, Japan
Nagwa Ali Sabri, Ain Shams University, Egypt
Ibrahim C. Haznedaroglu, Hacettepe University Hospital, Türkiye

© 2023 Nawata. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Kazumitsu Nawata kn1016abc@gmail.com

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