Serpil Şahin

Department of Cardiovascular Surgery, Çanakkale Onsekiz Mart University Faculty of Medicine, Çanakkale, Türkiye

Keywords: Cardiovascular surgery, peripheral, thesis.


Objectives: In this document analysis , medical specialty theses published in the field of cardiovascular surgery on peripheral vascular diseases in Türkiye were evaluated.

Materials and methods: The study group of the research consisted of theses made in Türkiye between 1981 and 2021 and indexed in the database of the Council of Higher Education National Thesis Center. The theses obtained in the category of specialization in medicine and in the Cardiovascular Surgery Department with the keyword "peripheral" were transferred to Excel forms created by the researcher. The name of the author of each thesis, the year of the thesis defense, the title of the thesis, the name of the thesis supervisor, the name and type of the institution where the thesis was conducted, the sample size of the thesis, the type of the study, and the data collection tools were evaluated.

Results: As a result of the research, 32 theses were reached. The first thesis was published in 1981. The highest number of these were published between 2010 and 2019. The authors of 25 (78.12%) of the theses were male researchers. 93.75% of them were carried out at state universities. Of the 21 thesis managers, 65.62% were professors. The highest number of theses were published by Dicle University (n=3) and Atatürk University (n=3). There was only one thesis, and that was animal experimentation. In one study, a questionnaire was used as a data collection tool. In 30 of them, patient registration information was data collection tools. Sample sizes ranged from 11 to 1,136. The mean sample size was 162. The control group had only two dissertations. An ankle-brachial index measurement was used in four theses. Clinical features were compared in seven, surgical techniques in four, radiological methods, and drug efficacy in three theses.

Conclusion: Prospective studies were included in 53.12% of these. This rate is below the expected level for thesis studies. It may be more beneficial to include more experimental studies, studies with a control group, and larger sample sizes in terms of understanding the pathophysiology and management of this disease.


There have been major advances in the management of the most common vascular diseases in recent years. Vascular surgeons have taken the lead in the development and implementation of innovative endovascular methods that have profoundly altered the therapy options for these patients. At the same time, the development of new screening and diagnostic test methods and strategies is encouraging improvements in this field.[1]

The term thesis is derived from the Ancient Greek tithenai (to place or to put forth). It was used to refer to projects developed in higher education institutions in the years that followed. Although the earliest thesis research was conducted in Germany in the 1800s, the first theses were published in Türkiye in 1937.[2-5] One of the indicators that makes it possible to evaluate a field of science, in general, is the evaluation of theses published in that discipline. Thus, it is possible to evaluate the reality, evolution, methodological positioning, and research trends of a scientific discipline.[6]

The purpose of this study was to evaluate the methods and research strategies employed in the theses on peripheral vascular diseases that were published in the field of cardiovascular surgery in Türkiye.

Patients and Methods

In this study, document analysis (bibliometric analysis), which is one of the qualitative research methodologies, was employed.

The study group consisted of theses from Türkiye that were indexed in the Council of Higher Education (CoHE) National Thesis Center database between January 1981 to December 2021.[7] The theses obtained in the area of specialization in medicine with the term 'peripheral' and in the Department of Cardiovascular Surgery were transferred to Excel forms created by the researcher. For each thesis, the following contextual variables are coded: the author's name, sex, the year of the thesis defense, the title of the thesis, the name of the thesis supervisor(s), the name and type of institution where the thesis is conducted, the sample size of the thesis, the type of thesis, the number of pages of the thesis, whether open access is possible, and data collection tools.

To assess the data, percentage, and frequency values were calculated. Content analysis of published theses was also carried out.


As an outcome of the research, 32 theses with page counts ranging from 20 to 127 (on average 79.6) were found. Twenty-seven of them had full-text access. The first thesis was published in 1981. Most theses were published between 2010 and 2019 as shown in Table 1. Male researchers were the authors of 25 (78.12%) of the theses. Thirty (93.75%) of them were conducted at public universities as shown in Figure 1. Twenty-one (65.62%) of the thesis supervisors were professors as shown in Figure 2.

The universities with the most published theses in peripheral vascular surgery are Dicle University (n=3) and Atatürk University (n=3) as shown in Table 2.

Seventeen (53.12%) of the theses were prospective studies as shown in Figure 3.

Only one thesis included an animal experiment. A questionnaire was employed as a data-gathering tool in one investigation. The data gathering tools in 30 of them were patient record information (automation system, epicrisis). The sample sizes ranged from 11 to 1,136. The average sample size was 162. Only two theses included a control group. Fifteen of them were compared to one another. Four theses made use of anklebrachial index measurements. Seven studies examined clinical features, four studies compared surgical techniques, three studies compared radiologic methods, and three studies evaluated pharmacological efficacy. Table 3 contains a brief summary of theses.


The theses in the Higher Education Information System (YÖKSİS) National Thesis Center database were thoroughly reviewed in our study. Although the local literature contains a wide range of research examining theses, no similar study on cardiovascular surgery was found.[8-13]

A total of 32 theses on peripheral vascular diseases in the subject of cardiovascular surgery were reached in this study. According to the same database, this rate represented only 18.07% of 177 theses. The evaluation of the theses based on the distribution of theses by years indicated that there was an increase in theses on peripheral vascular diseases, particularly between 2010 and 2019, with four theses published in the last two years. In earlier years, the distribution was erratic. This can be viewed as a step forward on this subject.

It was determined that the retrospective method was often utilized in the study area, and the data collection tools were patient data (patient documentation/automation system). Four theses contained the calculation of the anklebrachial index. Prospective studies were included in 17 (53.12%) of the theses. This rate is lower than what is expected for thesis studies. Fourteen studies were designed retrospectively. Only two theses included a control group.

Nonetheless, the current study has several limitations. First, only theses from the relevant database were analyzed. There is a possibility that some theses are not registered in the relevant database. Second, the entire texts of numerous theses were inaccessible.

In conclusion, more experimental investigations involving control groups (e.g., inflammatory/biochemical parameters, genetic-based studies, next-generation treatments, etc.) and larger sample sizes may be more valuable in understanding the pathogenesis and management of this disease. It was determined that none of the theses we evaluated within the scope of the research were financed by institutions such as the Scientific and Technological Research Council of Türkiye/ the Scientific Research Projects (TÜBİTAK/ BAP). It can be concluded that researchers should be more assertive in utilizing financial support.

Cite this article as: Şahin S. Examination of theses on peripheral vascular surgery. D J Med Sci 2022;8(3):97-101.

Ethics Committee Approval

This study, which used document analysis, does not require ethical approval since it is not a human or animal study. The study was conducted in accordance with the principles of the Declaration of Helsinki.

Data Sharing Statement:
The data that support the findings of this study are available from the corresponding author upon reasonable request.

Conflict of Interest

The authors declared no conflicts of interest with respect to the authorship and/ or publication of this article.

Financial Disclosure

The authors received no financial support for the research and/or authorship of this article.


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