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Objective: Chinese herbal medicine formula and calcium antagonist are commonly used medicines for hypertension in China. This study aims to examine the efficacy and safety of for the treatment of Chinese herbal medicine formula combined calcium antagonist hypertension. Methods: PubMed, the Cochrane library, CNKI, VIP, Sinomed, and Wanfang Database were searched up to January 31, 2021. Data analysis was performed using the Recman 5.3. The source of clinical heterogeneity used stata16.0 for sensitivity analysis. Results: 17 RCTs and 1587 cases were finally included. The results shows that the traditional Chinese medicine decoction combined with calcium antagonists is better than calcium antagonists alone in the treatment of hypertension. In addition, it can effectively alleviate the adverse reactions caused by calcium antagonists. However, due to the low quality of methodology and the small-scale research, more high-quality clinical trials are still needed for verification.

Background. Chronic heart failure is the main critical illness and cause of death in the later stages of cardiovascular disease, and it is one of the two major challenges in the field of cardiovascular research. The clinical application of traditional Chinese medicine in the prevention and treatment of chronic heart failure has been relatively common in China, and the “Expert Consensus on the Diagnosis and Treatment of Chronic Heart Failure with Integrated Traditional Chinese and Western Medicine” has been published in China. Combining the literature in this field, the authors found that Zhigancao Decoction has been used in the treatment of chronic heart failure with more clinical research reports and higher frequency (this article refers to it as a high-frequency prescription for short). However, Zhigancao Decoction was not included in the recommended prescriptions in the “Expert Consensus on the Diagnosis and Treatment of Chronic Heart Failure with Integrated Traditional Chinese and Western Medicine,” and there was no relevant systematic review and meta-analysis. For this reason, this article has carried out two parts of work, including systematically organizing the literature in this research field and carrying out systematic review and meta-analysis. This can provide stronger evidence support for Zhigancao Decoction combined with conventional Western medicine in the treatment of chronic heart failure and provide a new option for the improvement and update of the “Expert Consensus on the Diagnosis and Treatment of Chronic Heart Failure with Integrated Traditional Chinese and Western Medicine.” Methods. This article used the bibliometric method to investigate the research articles on the treatment of chronic heart failure with integrated traditional Chinese and Western medicine and analyzed the high-frequency prescriptions which are used and reported frequently. In addition, we also used manual and computer-aided search methods, the search scope includes CNKI, WANFANG, VIP, SinoMed, Web of Science, PubMed, and Cochrane Library, and the search content is the clinical randomized control of Zhigancao Decoction combined with conventional Western medicine in the treatment of chronic heart failure trials (RCTs). The search period is from the establishment of the database to January 29, 2021. The literature was managed and screened by EndNote software; the quality of the included literature was evaluated according to the modified Jadad scale, and the risk bias was assessed using the Cochrane tool; the results of the included studies were analyzed using the Review Manager 5.3 software; the sources of heterogeneity between the studies were analyzed using Stata16.0 software for sensitivity analysis. Results. According to the bibliometric analysis, the maximum number of research reports is 553, which are arranged in descending order of 21 prescriptions, including Zhenwu Decoction, Zhigancao, and powder of five drugs containing poria. The second most frequently used prescription is Zhigancao Decoction combined with conventional Western medicine in the treatment of chronic heart failure, but its systematic review and meta-analysis still need further research. A total of 17 clinical randomized controlled trials of Zhigancao Decoction combined with conventional Western medicine in the treatment of chronic heart failure were included in the search, with a total of 1752 subjects. Meta-analysis results show that Zhigancao combined with conventional Western medicine is more effective than conventional Western medicine in the treatment of chronic heart failure. The advantages are the following 5 outcome indicators: total clinical effective rate, left ventricular ejection fraction, left ventricular end-diastolic diameter, B-type natriuretic peptide, and 6-minute walk test. Conclusions. There are many prescriptions combined with Western medicine to treat chronic heart failure, among which Zhigancao Decoction is the second most frequently used prescription. There are many original studies on Zhigancao Decoction combined with conventional Western medicine in the treatment of chronic heart failure. The quality of the evaluation research shows that the overall standard is scientific, and a few experimental designs are slightly irregular. Meta-analysis shows that Zhigancao Decoction combined with conventional Western medicine has better therapeutic effects and safety than conventional Western medicine. This shows the characteristics and advantages of integrated Chinese and Western medicine in the treatment of cardiovascular diseases and is worth recommending.

Karst springs are scenic natural resources in karst areas of Florida, currently under threat from increasing groundwater withdrawal from the Floridan Aquifer and pollution resulting from a variety of sources. This paper estimates the current recreation benefits from visiting springs using the travel cost method and elicits residents&rsquo, willingness to contribute for springs restoration using the contingent valuation method. It further compares the performance of count data models correcting for endogenous stratification and truncation, and finds that the annual consumer surplus per person per trip is between $20 and $43, and the annual total recreational value for the four springs studied is about $25 million. Furthermore, visitors are willing to contribute $12 to $14 per person per trip for springs restoration without reducing trip demand.

Fresh water springs are unique natural resources in Florida, currently under threat from increasing groundwater pumping and pollution resulting from a variety of sources. This paper estimates current recreation benefits from visiting springs using the travel cost method and elicits residents’ willingness to contribute for springs restoration using the contingent valuation method. It further compares the performance of count data models correcting for endogenous stratification and truncation, and finds that the annual consumer surplus per person per trip is between $20 and $43. Furthermore, visitors are willing to contribute $12 to $14 per person per trip for springs restoration without reducing trip demand.