Impact of daily lifestyle on coronary heart disease

  • Authors:
    • Yan‑Fang Wan
    • Xiao‑Li Ma
    • Chen Yuan
    • Ling Fei
    • Jing Yang
    • Jun Zhang
  • View Affiliations

  • Published online on: July 17, 2015     https://doi.org/10.3892/etm.2015.2646
  • Pages: 1115-1120
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Abstract

Limited data are available with regard to the impact of daily lifestyle choices in patients with coronary heart disease (CHD) who have undergone stent placement. Thus, the aim of the present study was to investigate the impact of daily lifestyle factors in patients with CHD following stent implantation. Between March 2005 and March 2006, 129 consecutive patients with CHD were admitted to Cangzhou Central Hospital at Hebei Medical University (Cangzhou, China). The patients underwent coronary stenting and participated in a 7‑year clinical follow‑up that analyzed the impact of their daily lifestyle choices on CHD following the stent placement. Rates of dinner satiety [95% confidence interval (CI), 1.121‑10.97, P=0.005], smoking (95% CI, 4.05‑34.90, P=2.01x10‑7) and heavy alcohol use (95% CI, 1.32‑11.05, P=0.006) were significantly higher in the repeated (re)‑revascularization group when compared with the non‑revascularization group. In addition, the exercise rate was significantly lower in the re‑revascularization group when compared with the non‑revascularization group (95% CI, 0.02‑0.65, P=0.005). However, no statistically significant differences were observed between the groups with regard to sleeping patterns (95% CI, 0.03‑0.71, P=0.270) or anxiety rates (P=0.289). A coronary angiography performed during re‑revascularization revealed in‑stent restenosis in 26% of the patients, stenoses at the entrance to or exit from the stent in 29% of the patients and new lesions in 19% of the patients. Furthermore, original lesions exhibited deterioration in 26% of the patients. The clinical endpoint was reached in 55% of the patients between 3 and 5 years of the follow‑up period. In conclusion, poor daily lifestyle habits can increase the in‑stent restenosis rate, accelerate the progression of the original lesion and promote the emergence of new lesions in patients with CHD following stent placement.

Introduction

The incidence of coronary heart disease (CHD) is increasing in Chinese society. To date, CHD is among the main causes of mortality in Chinese adults (1). Since the introduction of coronary intervention technology, the technique has become one of the primary methods for the treatment of CHD. Coronary intervention has been used successfully to treat a large number of patients with acute myocardial infarction (MI), and the therapy substantially improves the quality of life of patients with unstable angina (2). Therefore, the number of patients undergoing coronary intervention is increasing (3,4). Concurrently, the prognosis of stenting has significantly improved as a result of the widespread use of drug-eluting stents and anticoagulation (24). In the Cangzhou region of China, the number of patients who underwent percutaneous coronary intervention (PCI) increased rapidly from 102 to 1,628 cases per year between 2000 and 2010 (unpublished data).

In recent decades, lifestyle factors have been recognized as important determinants of health status and have increasingly become a focus of research interest worldwide. Previous studies have demonstrated (57) that healthy lifestyle habits reduce disease and mortality rates, and that sociodemographic parameters, such as gender, age, marital status, economical level and paid employment, correlate with a healthy lifestyle (8,9). In China, the substantial societal changes brought on by modernization have altered lifestyle habits. Compared with 10 years ago, Chinese individuals of today eat more, drink more, smoke more, have increased anxiety and exercise less. Therefore, the aim of the present retrospective analysis was to investigate the impact of various daily lifestyle indicators, including the dinner satiety rate, tobacco use, heavy alcohol use, sleep pattern, anxiety and exercise, in patients with CHD who had undergone a stent implantation over a 7-year follow-up period.

Patients and methods

Patients and procedures

In total, 129 consecutive patients with CHD and indications for PCI and stent implantation, who were admitted to the Cangzhou Central Hospital at Hebei Medical University (Cangzhou, China) between March 2005 and March 2006, were recruited for the study. The patients received lifelong oral aspirin (100 mg daily) initiating subsequent to the procedure, and clopidogrel (75 mg daily) starting prior to the procedure and ending one year subsequent to the procedure. The study was conducted in accordance with the Declaration of Helsinki and with approval from the Ethics Committee of Hebei Medical University. Written informed consent was obtained from all the participants. Patients were eligible for inclusion if they met the following criteria: i) Angiographically confirmed stenosis of ≥75% in at least one proximal epicardial coronary artery; and ii) underwent stent implantation according to the American College of Cardiology/American Heart Association PCI guidelines (10). Patients were excluded from the study if they were aged <18 or >70 years, and had a history of other organic diseases, diabetes, heart failure or stage III hypertension. In addition, exclusion criteria included unsatisfactory stent placement, such as poor adherence, artery dissection and low flow, and mortality or MI within one month following stent placement. Patients were also excluded if coronary artery bypass grafting (CABG) was indicated initially, however, PCI was performed instead.

Data collection and follow-up

Data entered into the database were collected from patient charts or through bedside inquiry and physical examination. In-hospital outcome data were complete for all the patients. Following hospital discharge, the patients were monitored by telephone, clinic visits and calls to their primary care physicians; this information was corroborated with hospital records. The clinical endpoint was a composite of target lesion revascularization, defined as repeated PCI and CABG. The follow-up period continued for 7 years (2006–2013), and the success rate was 88.37% (114/129).

Dinner satiety was defined as eating ≥200 g for dinner almost daily, and tobacco use was defined as smoking ≥10 cigarettes a day. Heavy alcohol consumption was defined as consuming ≥20 units alcohol at least three times a week or >60 units weekly. Regular sleep was defined as ≥4 days of regular sleep each week. Anxiety was defined as a Hamilton Depression Rating Scale score of <17 and a Hamilton Anxiety Rating Scale score or >14 (11). Exercise was defined as physical activity ≥3 days a week for a minimum of 1 h.

Groups

Patients were grouped according to the occurrence of the clinical endpoint and to the association between daily lifestyle indicators and CHD prognosis following PCI.

Statistical analysis

Median (range), mean (forecast standard deviation) and percentage values were calculated for the overall sample. The χ2 test was used to assess differences in the categorical and continuous baseline variables between the subgroups.

Independent prognostic variables were assessed using multivariate logistic regression models that included dinner satiety, tobacco use, heavy alcohol use, sleep pattern, anxiety and exercise. P<0.05 was considered to indicate a statistically significant difference, and statistical analysis was performed using SPSS software (version 16.0; SPSS, Inc., Chicago, IL, USA).

Results

Baseline characteristics

During the enrollment period, 129 consecutive patients with PCI were surveyed. Patients were divided into two groups according to whether they reached the clinical endpoint. The repeat (re)-revascularization group included 38 patients who underwent re-revascularization. The non-revascularization group included 76 patients who did not reach the clinical endpoint. The mean age of the patients was 55.9±7.8 years, and 66.7% of the patients were male. No statistically significant differences were observed in baseline demographics and clinical characteristics between the two groups (P>0.05; Tables I and II).

Table I.

Baseline demographic and clinical characteristics of the study patients.

Table I.

Baseline demographic and clinical characteristics of the study patients.

CharacteristicRe-revascularization (n=38)Non-revascularization (n=76)P-value
Agea, years55.8±8.2156.4±7.560.176
Male gender, n (%)27 (71.05)49 (64.47)0.482
BMIa, kg/m224.97±4.4424.76±4.440.79
Family history of CAD, n (%)4 (10.53)9 (11.84)>0.05
Hyperlipidemia, n (%)25 (65.79)49 (64.47)>0.05
Previous stroke, n (%)4 (10.53)6 (7.89)>0.05
Stages I–II hypertension, n (%)26 (68.42)45 (59.21)0.98
Prior cardiovascular disease, n (%)
  Prior MI10 (26.32)14 (18.42)>0.05
  Prior PCI4 (10.53)7 (9.21)>0.05
Clinical presentation
  Acute MI, n (%)15 (39.47)29 (38.16)>0.05
  Unstable angina, n (%)14 (36.84)30 (39.47)>0.05
  Chronic stable angina, n (%)7 (18.42)12 (15.79)>0.05
  Silent ischemia, n (%)2 (5.26)5 (6.58)>0.05
  Left ventricular ejection fractiona50.3±7.951.4±6.6>0.05
Medication at discharge, n (%)
  β-blocker22 (57.89)39 (51.32)>0.05
  ACEI or ARB19 (50)34 (44.74)>0.05
  Statins32 (84.21)71 (93.42)>0.05
  Aspirin38 (100)76 (100)>0.05
  Clopidogrel36 (94.73)70 (92.11)>0.05
Dinner satiety, n (%)32 (84.21)44 (57.89)0.005
Tobacco use, n (%)25 (65.79)13 (17.11)2.01E-07
Heavy alcohol use, n (%)20 (52.63)20 (26.32)0.006
Regular sleep, n (%)27 (60.53)46 (71.05)0.270
Anxiety, n (%)22 (57.89)36 (47.37)0.289
Exercise, n (%)2 (5.26)21 (27.63)0.005
Type of stent, n (%)
  ZETA5 (13.16)11 (14.47)>0.05
  HEListent2 (5.26)4 (5.26)>0.05
  Driver5 (13.16)12 (18.42)>0.05
  Vision3 (7.89)5 (6.58)>0.05
  Cipher14 (36.84)24 (31.58)>0.05
  Firebird9 (23.68)20 (26.32)>0.05
Numbers of stents, n (%)
  121 (55.26)49 (64.47)>0.05
  213 (34.21)21 (27.63)>0.05
  34 (10.53)6 (7.89)>0.05
  400

a Data are presented as the mean ± standard deviation. Re-revascularization, repeat revascularization; BMI, body mass index; CAD, coronary artery disease; MI, myocardial infarction; PCI, percutaneous coronary intervention; ACEI, acetylcholinesterase inhibitor; ARB, angiotensin II receptor blockers.

Table II.

Angiographic characteristics.

Table II.

Angiographic characteristics.

Target lesion coronary artery Re-revascularization (n=38) Non-revascularization (n=76)
Left main  0  0
Left anterior descending1940
Left circumflex  815
Right1121

The study flow chart is shown in Fig. 1. At the end of the 7-year follow-up, six patients had missed their follow-up, two patients had succumbed to acute MI after three and five years, four patients had succumbed to a non-cardiac disease and three patients with angina had refused to undergo a repeat angiography.

Baseline data and procedure results

Incidence rates of dinner satiety (84.21%), tobacco use (65.79%) and heavy alcohol use (52.63%) were significantly higher in the re-revascularization group compared with the non-revascularization group (57.89, 17.11 and 26.32%, respectively). In addition, the exercise rate was significantly lower in the re-revascularization group (5.26%) compared with the non-revascularization group (27.63%; P<0.05) (Table I and Fig. 2).

Angiographic follow-up data

A repeat angiography revealed in-stent restenosis in 26% of the patients, stenoses at the entrance to or exit from a stent in 29% of the patients and new lesions in 19% of the patients. In 26% of the patients, the original lesions were found to have deteriorated (Table III and Fig. 3).

Table III.

Seven-year clinical follow-up.

Table III.

Seven-year clinical follow-up.

Follow-up dataCases, n (%)
Missed follow-up6 (4.65)
Mortality2 (1.55)
Cardiac mortality4 (3.10)
Refusal3 (2.33)
Re-revascularization (n=38)
  Lesions aggravated10 (26)
  In-stent restenosis10 (26)
  New lesions7 (19)
  Entrance and exit stenosis of stent11 (29)

[i] Re-revascularization, repeat revascularization.

Clinical outcome

A multivariate logistic regression analysis revealed that dinner satiety, tobacco use, heavy alcohol use and exercise significantly impacted CHD (P<0.05; Table IV). The clinical endpoint was reached in 55% of the cases between 3 and 5 years of the follow-up period (Fig. 4).

Table IV.

Multivariate logistic regression analysis of the prognostic factors for patients with PCI.

Table IV.

Multivariate logistic regression analysis of the prognostic factors for patients with PCI.

Prognostic factorOR95% CIP-value
Dinner satiety3.321.06–10.480.040
Tobacco use11.713.95–34.71<0.001
Heavy drinking3.741.27–10.980.017
Regular sleep1.500.51–4.390.461
Anxiety1.570.56–4.440.395
Exercise0.140.02–0.650.013

[i] PCI, percutaneous coronary intervention; CI, confidence interval; OR, odds ratio.

Discussion

Numerous aspects influence patient prognosis following coronary stent placement. A previous study (12) focused on a variety of causes for in-stent restenosis; however, the present study found that the in-stent restenosis rate (including stenosis at the entrance to and exit from the stent) was only 55%. In addition, new lesions were identified in 19% of the cases and deterioration of the original lesions accounted for 26% of the cases. Thus, patient prognosis following coronary stent placement was not only found to concern in-stent restenosis, but was also shown to depend on new lesions and the deterioration of original lesions. In the present study, poor daily lifestyle habits were demonstrated to increase the in-stent restenosis rate, accelerate the progression of the original lesion and promote the emergence of new lesions.

The evening is an important period for physical rest and self-healing, in which sympathetic nerve activity decreases and parasympathetic nerve activity increases, resulting in the normal secretion and regulation of a variety of circulatory endocrine factors and hormones (13,14). Anxiety and irregular sleep disrupt this balance to a certain extent, and eventually impair various balance and repair mechanisms. The results from the current study revealed that anxiety and irregular sleep did not significantly differ between the two groups (P>0.05); however, the incidence of anxiety and irregular sleep in the two groups was ~50% (Table I). This observation demonstrates that anxiety and irregular sleep are relatively common phenomena in patients with CHD, indicating that anxiety and irregular sleep may be precipitating factors for developing vascular lesions (1517).

The present study found that the dinner satiety rate in the re-revascularization group (84.21%) was significantly higher compared with that in the non-revascularization group (57.89%). A previous study (18) demonstrated that dinner satiety can affect sleep, and that high food consumption during dinner is followed by a series of adverse consequences. A high fat intake can elevate serum leptin levels and decrease leptin receptor levels, leading to the leptin resistance phenomenon (19). Leptin resistance not only affects the transfer of satiation signals, but also activates the sympathetic nervous system and affects the stability of vascular endothelial cells through the endothelin (ET-1) receptor, a downstream effector of nicotinamide adenine dinucleotide phosphate oxidase (20,21). Leptin resistance also promotes endothelial inflammatory factor activity, which may lead to the development of atherosclerosis and promote adenosine diphosphate-induced platelet aggregation to form thromboses, thereby causing acute coronary events (22). Impaired dinner satiety is also one of the main causes of excess weight and obesity, which are major risk factors for CHD in the Chinese population (23,24). In addition, smoking is a well-known independent risk factor for CHD. The current study demonstrated that tobacco use in the re-revascularization group (65.79%) was significantly higher when compared with the non-revascularization group (17.11%). Smoking can damage vascular endothelial function and stability, promote myocardial hypoxia and cause coronary artery spasm (25). Furthermore, smoking can induce a variety of factors, such as thromboxane A2, CD40 and prostacyclin, that cause angiosclerosis-accelerated plaque formation, which subsequently induces plaque rupture and thrombosis (26,27). In a previous study, heavy drinking was found to be a risk factor for cardiovascular disease (28); the study found that alcohol consumption had a U-shaped curve association with cardiovascular disease, particularly the incidence of MI and CHD (29,30). Heavy drinking affects the normal function of the body's clotting system and the vascular endothelium. In addition, increased alcohol consumption can activate oxidative stress and alter the activities of several inflammatory cytokines, including ET-1, tumor necrosis factor-α, interleukin-6 and nitric oxide, subsequently leading to plaque formation and blood clots in the blood vessels (3133). Patients with CHD require exercise; however, the present study found that just 5.26% of patients in the re-revascularization group and 27.63% of patients in the non-revascularization group exercised regularly. Previous studies have shown that adequate exercise improves blood circulation, prevents thrombosis and embolism, improves the internal functioning of the body, improves sleep, relieves anxiety and restores normal nerve and humoral regulation (3436).

In the current study, 55% of patients exhibited revascularization and showed poor daily lifestyle habits during the 3–5 years of the 7-year follow-up. The highest frequency of events occurred in the fifth year of follow-up. Based on the analysis of these results, the following hypothesis can be concluded: Among patients with CHD who undergo stent implantation and do not improve on their lifestyle choices, 55% of individuals are likely to require revascularization in the subsequent 3–5-year period.

The present study had several important limitations. The major limitation was the relatively small number of patients. The study was a retrospective, randomized, single-blind study, rather than a double-blind study. In addition, the type of stent implanted was left to the discretion of the surgeon; thus, different types of stents were used in different clinical circumstances and the procedure was not standardized. Finally, few of the patients who did not require revascularization received angiographic follow-up.

In conclusion, despite major breakthroughs in the prevention and treatment of CHD, this disease remains the most common cause of mortality in the Asian Pacific region (37). PCI with stent placement is the gold standard for treating patients with CHD; however, re-revascularization is a recurring problem following PCI. Currently, there is a large amount of data with regard to in-stent restenosis; however, in numerous stent patients, deterioration of the original lesions and new lesion sites have been found to occur subsequent to the administration of sufficient treatment. In the present study, daily lifestyle factors were demonstrated to significantly affect the prognosis of patients with stents. Therefore, future large-scale clinical trials are required with the aim of offering more specific treatment guidance.

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Wan YF, Ma XL, Yuan C, Fei L, Yang J and Zhang J: Impact of daily lifestyle on coronary heart disease. Exp Ther Med 10: 1115-1120, 2015
APA
Wan, Y., Ma, X., Yuan, C., Fei, L., Yang, J., & Zhang, J. (2015). Impact of daily lifestyle on coronary heart disease. Experimental and Therapeutic Medicine, 10, 1115-1120. https://doi.org/10.3892/etm.2015.2646
MLA
Wan, Y., Ma, X., Yuan, C., Fei, L., Yang, J., Zhang, J."Impact of daily lifestyle on coronary heart disease". Experimental and Therapeutic Medicine 10.3 (2015): 1115-1120.
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Wan, Y., Ma, X., Yuan, C., Fei, L., Yang, J., Zhang, J."Impact of daily lifestyle on coronary heart disease". Experimental and Therapeutic Medicine 10, no. 3 (2015): 1115-1120. https://doi.org/10.3892/etm.2015.2646