Traditional Chinese Medicine Syndromes for Essential Hypertension: A Literature Analysis of 13,272 Patients

Wang, Jie; Xiong, Xingjiang; Liu, Wei

doi:https://doi.org/10.1155/2014/418206

Evidence-Based Complementary and Alternative Medicine

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Herbal Medicines for Cardiovascular Diseases

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Volume 2014 | Article ID 418206 | https://doi.org/10.1155/2014/418206

Traditional Chinese Medicine Syndromes for Essential Hypertension: A Literature Analysis of 13,272 Patients

Jie Wang,¹Xingjiang Xiong,¹and Wei Liu¹

Academic Editor: Bo Feng

Received29 Oct 2013

Accepted19 Dec 2013

Published10 Feb 2014

Abstract

Background. To simplify traditional Chinese medicine syndrome differentiation and allow researchers to master syndrome differentiation for hypertension, this paper retrospectively studied the literature and analyzed syndrome elements corresponding to hypertension syndromes. Methods. Six databases including PubMed, EMBASE, Chinese Bio-Medical Literature Database, Chinese National Knowledge Infrastructure, Chinese Scientific Journal Database, and Wan-fang Data were searched from 1/January/2003 to 30/October/2013. We included all clinical literature testing hypertension syndromes and retrospectively studied the hypertension literature published from 2003 to 2013. Descriptive statistics calculated frequencies and percentages. Results. 13,272 patients with essential hypertension were included. Clinical features of hypertension could be attributed to 11 kinds of syndrome factors. Among them, seven syndrome factors were excess, while four syndrome factors were deficient. Syndrome targets were mainly in the liver and related to the kidney and spleen. There were 33 combination syndromes. Frequency of single-factor syndromes was 31.77% and frequency of two-factor syndromes was 62.26%. Conclusions. Excess syndrome factors of hypertension patients include yang hyperactivity, blood stasis, phlegm turbidity, internal dampness, and internal fire. Deficient syndrome factors of hypertension patients are yin deficiency and yang deficiency. Yin deficiency with yang hyperactivity, phlegm-dampness retention, and deficiency of both yin and yang were the three most common syndromes in clinical combination.

1. Introduction

Hypertension is an important public health issue worldwide because of its high prevalence and concomitant increase in disease risk [1–3]. It has been estimated that 29% of the world’s adult population, or approximately 1.56 billion people, will have hypertension by 2025 [4, 5]. Complementary and alternative medicine (CAM) is becoming increasingly popular [6–13] and numerous interventions are regularly recommended to lower elevated blood pressure (BP) [14–17]. Traditional Chinese medicine (TCM), including herbal medicine and acupuncture, is an important component of CAM therapies [18–21]. Hypertension could be improved by insights from TCM and considerable progress has been made in lowering BP by TCM [22–26].

Syndrome differentiation is a diagnostic and treatment method used in TCM [27, 28]. It plays an important role in the therapeutic process and affects the therapeutic result of certain diseases [29–31]. The syndrome is not only the basic unit of TCM theory and syndrome differentiation, but also the bridge to associating disease and formula [32–35]. TCM syndrome, which is different from a disease or symptoms, is the abstraction of a major pathogenesis. Syndromes are identified from a comprehensive analysis of all symptoms and signs (including tongue appearance and pulse feeling) from the four main diagnostic TCM methods: observation, listening, questioning, and pulse analyses [36–40]. However, syndromes are the product of speculation in TCM. Therefore, they depend on medical experience, academic origins, and other factors. Therefore, the concept of syndromes is vague and broad, which makes clinical application difficult. Syndrome elements, which are the minimum units of syndromes, contribute to simplifying syndrome differentiation and understanding TCM syndromes. Each element has specific symptoms.

To simplify TCM syndrome differentiation and enable researchers not familiar with Chinese medicine to master the laws of hypertension syndrome differentiation, this paper retrospectively studied the literature for 13,272 patients with hypertension, published from 2003 to 2013. This study is beneficial to deepening of the understanding of hypertension and providing a basis and reference for clinical treatment using TCM syndrome differentiation.

2. Materials and Methods

2.1. Database and Search Strategies

Six databases including PubMed, EMBASE, Chinese Bio-Medical Literature Database (CBM), Chinese National Knowledge Infrastructure (CNKI), Chinese Scientific Journal Database (VIP), and Wan-fang Data were searched from 1/January/2003 to 30/October/2013. Databases in Chinese were searched to retrieve the maximum possible number of trials of syndrome differentiation for essential hypertension (EH) because syndrome differentiation is mainly used in China. Ongoing registered clinical trials were searched at the International Clinical Trial Registry by the U.S. National Institutes of Health (http://clinicaltrials.gov/). The following search terms were used individually or combined: “hypertension,” “blood pressure,” “essential hypertension,” “syndrome differentiation,” “vertigo,” “headache,” “parting,” and “traditional Chinese medicine therapy.” The bibliographies of included studies were searched for additional references.

2.2. Inclusion and Exclusion Criteria

Systolic blood pressure (SBP) ≥140 mmHg (1 mmHg = 0.133 kPa) and diastolic blood pressure (DBP) ≥90 mmHg from the literature were based on 1999 WHO-ISH Guidelines for the Management of Hypertension (1999 WHO-ISH GMH), 1998 WHO-ISH Guidelines for the Management of Hypertension (1998 WHO-ISH GMH), 2000 WHO-ISH Guidelines for the Management of Hypertension (2000 WHO-ISH GMH), Chinese Guidelines for the Management of Hypertension-2005 (CGMH-2005), China Guidelines on Prevention and Management of High Blood Pressure-2006 (CGPMHBP-2006), and Seventh Report of the Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC 7). Syndrome differentiation of TCM diagnosis used the Standard of TCM Diagnosis and Curative Effect of Disease-Syndrome, published by the State Administration of Traditional Chinese Medicine in 1994. Standards of dialectical classification used Clinical Research Guiding Principles of New Medicine of Chinese Herbs revised by the State Food and Drug Administration in 2002. Exclusion criteria were secondary hypertension, gestational hypertension, repeated literature, reviews, and literature with no clear classification.

2.3. Classification Criteria of Syndrome Elements

According to the classification criteria of syndrome elements proposed by Wang, statistical analysis was conducted for syndromes included in the cases. The classification criteria of syndrome elements were (1) six-excess external contraction: wind, cold, dampness, dryness, and fire; (2) five endogenous qi: internal wind, internal cold, internal dampness, internal dryness, and internal fire; (3) factors related to gas: qi deficiency, qi stagnation, qi block, qi counterflow, qi fall, and qi collapse; (4) factors related to blood: blood deficiency, blood stasis, blood collapse, blood dryness, and bleeding; (5) factors related to yin and yang: yin deficiency, yang deficiency, yin exuberance, and yang hyperactivity; (6) others: poison, excessive fluid, and phlegm turbidity.

2.4. Statistical Methods

Two authors conducted the literature search, study selection, and data extraction independently. Disagreements were resolved by discussion and consensus was met through a third party. SPSS 11.5 statistical software was used for data analyses (Chicago, IL, USA). Descriptive statistics procedures calculated frequency and percentage.

3. Results

3.1. Description of Included Literature

After a primary search of the databases, 503 articles were screened. After reading the titles and abstracts, 398 articles were excluded the reasons included; retrospective study that did not match the included criteria of this review () and duplicated titles (). The full texts of 83 articles [41–123] were retrieved, and 22 articles were excluded for the following reasons: participants not meeting the inclusion criteria (), duplicated data (), patients having other diseases (), and no data for extraction (). In the end, 83 articles [41–123] were included, and all trials were conducted in China (Figure 1). The characteristics of included trials are listed in Table 1.

Overall, 13,272 patients with essential hypertension were included, with an average of 160 per trial, ranging from 23 to 703. Among them, 7075 were men, accounting for 53.3%, while 6197 were women, accounting for 46.7%. There was a wide range in patient age (18–92 years). Sources of cases included 24 provinces and the number of papers in each region is shown in Table 2.

3.2. Extraction of Syndrome Elements of EH

According to the definition of syndrome elements and classification criteria, syndrome elements were obtained and classified from the literature as follows: blood stasis (qi stagnation and blood stasis, qi deficiency with blood stasis, kidney deficiency and blood stasis, stasis blocking channels, phlegm and blood stasis resistance winding); qi stagnation (liver qi stagnation, qi stagnation and blood stasis); phlegm (phlegm turbidity resistance, phlegm-dampness retention); internal fire (intense liver fire, internal harassment of phlegm-heat); internal dampness (spleen deficiency with dampness encumbrance, phlegm-damp retention); internal wind (internal stirring of liver wind, wind-yang interference); qi deficiency (dual deficiency of qi and yin, dual deficiency of qi and blood, and qi deficiency with blood stasis); yang hyperactivity (ascendant hyperactivity of liver yang, yin deficiency with yang hyperactivity); yin deficiency (yin deficiency with yang hyperactivity, liver-kidney yin deficiency, dual deficiency of qi and yin, and deficiency of both yin and yang); yang deficiency (kidney yang deficiency, deficiency of both yin and yang); blood deficiency (dual deficiency of qi and blood). As a result, 13,272 cases of hypertension syndrome were classified as 11 syndrome element types, which cover all cases.

3.3. Analysis of Syndrome Elements of EH

Syndrome elements of 13,272 patients with hypertension were divided into excessive syndrome elements and deficient syndrome elements (Table 3, Figure 2). The proportions of excessive syndrome elements are yang hyperactivity (19.08%), phlegm turbidity (13.68%), internal fire (13.21%), internal dampness (11.04%), blood stasis (4.86%), internal wind (1.21%), and qi stagnation (0.78%). The proportion of deficient syndrome elements are yin deficiency (26.27%), yang deficiency (7.89%), qi deficiency (1.80%), and blood deficiency (0.18%). Excessive syndrome elements greater than 10% included yang hyperactivity, phlegm turbidity, internal fire, and internal dampness. Deficient syndrome elements greater than 10% included yin deficiency. Yang hyperactivity and yin deficiency were the most common syndrome elements of hypertension.

3.4. Targets of Syndrome Elements of EH

The targets of syndrome elements are the disease locations of individual syndrome elements. Disease location of syndrome elements was confirmed according to the five zang-organs and six fu-organs, chi heng fu, and meridians.

As a result, 9091 cases (68.50%) had clear targets of syndrome elements related to liver, kidney, and spleen (Table 4). There were 7789 cases of liver syndromes (85.68%). Among them, there were 2793 cases of internal fire of liver (35.86%), 4033 cases of ascendant hyperactivity of liver yang (51.78%), 543 cases of liver yin deficiency (6.97%), 164 cases of liver qi stagnation (2.11%), and 256 cases of internal stirring of liver wind (3.29%). There were 903 cases of kidney syndromes (9.93%). Among them, there were 879 cases of kidney yin deficiency (97.34%) and 24 cases of kidney yang deficiency (2.66%). There were 399 cases of spleen syndromes (4.39%), all of which were spleen qi deficiency.

3.5. Combining Forms of Syndrome Elements of EH

We found that 13,272 cases of hypertension contained 33 syndrome types. According to the definition of syndrome elements, all syndromes were divided into four types: single factor, two-factor, three-factor, and four-factor syndromes. The statistics of the combined forms of syndrome and their frequency (proportion more than 1%) are shown in Table 5. Internal fire is the most common in the single factor group, while yin deficiency with yang hyperactivity is the most common in the two-factor group. From highest to lowest frequency in the two-factor group are phlegm-damp retention, deficiency of both yin and yang, Liver-kidney yin deficiency, dual deficiency of qi and yin, qi stagnation and blood stasis, and qi deficiency with blood stasis. The syndrome, yin deficiency and wind-phlegm, is the most common in the three-factor category. There were no four-factor combinations that reached a frequency of greater than 1%.

4. Discussion and Perspectives

4.1. Pathogenesis of Hypertension

Syndrome elements are the expression of pathogenesis of a disease [36]. According to the statistical results of syndrome elements, pathogenesis of EH can be summarized as simultaneous insufficiency and excess. Deficiency syndrome included yin deficiency, yang deficiency, qi deficiency, and blood deficiency. Excess syndrome included blood stasis, phlegm turbidity, qi stagnation, yang hyperactivity, internal fire, internal dampness, and internal wind. Among them, yin deficiency was the most common, followed by yang hyperactivity. Other elements, included in descending order, were phlegm turbidity, internal fire, internal dampness, yang deficiency, blood stasis, qi deficiency, and internal wind. The main disease location is the liver, which is closely related to the kidney and spleen.

4.2. Characteristics of Combined Syndrome Elements of EH

The combined forms of syndrome elements of hypertension have certain characteristics according to the literature, summarized as follows. (1) The combined forms of syndrome elements of hypertension have three forms, single-factor, two-factor, and three-factor forms. (2) Excess syndromes are more common than deficiency syndromes for single-factor syndromes, with internal fire, yang hyperactivity, blood stasis, and phlegm turbidity as the main syndrome factors. (3) Deficiency syndrome and excess syndrome was the most common two-factor syndrome, followed by excess syndrome and excess syndrome and deficiency syndrome and deficiency syndrome, respectively. (4) Syndrome of yin deficiency and wind-phlegm was the most common three-factor syndrome.

4.3. Implications for Instructing Clinical Application

The discovery of distributing characteristics of syndrome elements is conducive to instructing clinical application. Several Chinese herbs and classical formulas can lower BP and improve symptoms according to syndrome differentiation (Table 6). First, when aiming to cure internal fire syndrome, use Huanglian Jie Du Tang (detoxicant decoction of Coptis) to clear heat and toxins of the liver [35]. Chinese herbs such as Xiakucao (Prunella vulgaris L.) [123], Huanglian (Coptis chinensis) [124], Huangqin (Scutellaria baicalensis Georgi), Huang-bai (Phellodendron bark), and Zhizi (Gardenia) [125] can lower BP. Second, when aiming to cure yin deficiency with yang hyperactivity, use Tianma Gouteng Yin (decoction of Gastrodia and Uncaria), a famous prescription noted in Za Bing Zheng Zhi Xin Yi (New Meanings in Syndrome and Therapy of Miscellaneous Diseases). Chinese herbs such as Tianma (Gastrodia) [126] and Gouteng (Uncaria) [127] could suppress liver yang hyperactivity. Niuxi (Achyranthes root) [128] and Duzhong (Eucommia ulmoides) [129–131] had antihypertensive effects by nourishing the kidney. Third, when aiming to cure phlegm-damp retention, use Wuling powder [132], Zexie Tang (decoction of Alisma) [133], and Wendantang jiawei decoction (modified decoction for clearing away gallbladder heat). In addition, when aiming at wind-phlegm syndrome, use Banxia Baizhu Tianma Tang (decoction of Pinellia ternata, Atractylodes macrocephala, and Gastrodia elata) to calm the liver, strengthen the spleen, remove dampness, and reduce phlegm [35]. Chinese herbs such as Zexie (Alisma), Fuling (Poria cocos) [134], Zhuling (Polyporus) [135], and Banxia (The tuber of pinellia) [136] could effectively reduce BP as well. Fourthly, to remove blood stasis, use Xuefu Zhuyu Tang, a famous classical prescription recorded in Yi Lin Gai Cuo (Correction of the Errors of Medical Works) by Wang Qingren in the Qing Dynasty. It is effective in removing blood stasis and promoting Qi. Herbs such as Chishao (red peony root) [137], Danshen (Salvia miltiorrhiza) [138], Yimucao (Leonurus japonicus), and Chuanxiong (Ligusticum chuanxiong Hort) [139] could also lower BP. When aiming to remove qi stagnation and blood stasis, use herbs to promote qi circulation by taking herbs to remove blood stasis. Herbs that promote qi circulation include Chaihu (Chinese thorowax root) [137], Cangzhu (Rhizoma Atractylodis), and Zhiqiao (Fructus Aurantii). Finally, deficiency syndromes including liver-kidney yin deficiency, yang deficiency, qi deficiency, and blood deficiency are common in hypertension. When curing liver-kidney yin deficiency, use Liu Wei Dihuang Wan (pill of Rehmannia) [23]. Liu Wei Dihuang Wan was recorded in Xiaoer Yaozheng Zhijue (Pediatric Medicine Card Straight) by Qianyi in the Song Dynasty, and it can replenish liver and kidney yin. When treating yang deficiency, use Shen qi Wan (kidney qi pill) to recuperate kidney yang. When aiming to treat qi deficiency, use Huangqi (Astragalus membranaceus) [140–142] and Baizhu (Rhizoma Atractylodis Macrocephalae). When aiming to treat blood deficiency, use Danggui (Angelica sinensis) [143], Shengdihuang (Radix Rehmanniae), Chuanxiong (Ligusticum chuanxiong Hort) [144], and Baishao (Radix Paeoniae Rubra).

In summary, the syndrome elements of hypertension are limited and are combined into syndromes. Single and the combined syndrome elements of hypertension are the basis of syndrome differentiation for EH and the key to the standardization of this syndrome. In this paper, we retrospectively confirmed the validity and reliability of the theory of syndrome elements and the combined forms of syndrome elements of hypertension. This study can provide new ideas and methods for the treatment of hypertension by syndrome differentiation, and has laid a foundation for researching syndrome standardization of hypertension.

Conflict of Interests

The authors declare that there is no conflict of interests regarding the publication of this paper.

Authors’ Contribution

Jie Wang and Xingjiang Xiong contributed equally in this paper.

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