A Review of the Clinical Use of Ultrasound in Korean Traditional Medicine

Article information

J Acupunct Res. 2019;36(4):204-210

Publication date (electronic) : 2019 November 25

doi : https://doi.org/10.13045/jar.2019.00297

, Tae Han Yook ¹, Beom Yong Song ¹, Yoo Min Choi ¹, Jin Hyeon Shin ¹, Hye Jeong Shin ¹, Sanghun Lee ², Young Ju Jeon ², Jong Uk Kim ¹^,

¹Department of Acupuncture & Moxibustion Medicine, Korean Medicine Hospital of Woosuk University, Jeonju, Korea

²Future Medicine Division, Korea Institute of Oriental Medicine, Daejeon, Korea

^*Corresponding author. Department of Acupuncture & Moxibustion Medicine, Korean Medicine Hospital of Woosuk University, Jeonju, Korea E-mail: ju1110@hanmail.net

Received 2019 October 20; Revised 2019 October 29; Accepted 2019 November 1.

Abstract

This study was performed to evaluate research studies utilizing ultrasound diagnostic units, the practitioners who performed the ultrasound assessments, and how they had been used primarily in tandem with the Korean Medicine Advanced Searching Integrated System. This study identified 46 studies following a literature search, and discovered that a Korean medicine doctor led the ultrasonography in 13 studies, a medical technician was responsible in 6 studies, a roentgenologist carried it out in 5, and 19 of the studies did not specify who had conducted it. Ultrasonography had been actively used in the course of the clinical practice of Korean medicine, and it may serve as a useful and reliable diagnostic tool for evaluating the effectiveness of Korean medicine. The results of this study will help to promote more ultrasound studies in the future.

Keywords: Korean traditional Medicine; ultrasound

Introduction

An ultrasound wave is a high-frequency sound wave that cannot be heard by the unassisted human ear. Since ultrasound waves have high frequencies, they travel poorly through air and travel well through liquids and solids [1]. It is believed that most people can hear sounds at frequencies up to 20,000 Hz. An ultrasound wave is defined as a high-pitched sound, equal to or above 20,000 Hz [2].

An ultrasound wave contains significant force, so it can generate heat or cause cavitation, i.e. create a vacuole in the living body. However, the ultrasound waves which are used in diagnostic devices, do not cause these phenomena because the wavelengths used do not possess enough energy making these devices safe to use without causing exposure to radiation.

Medical ultrasonography is a diagnostic imaging technique that can enable visualization of muscles, tendons whose size, structures, and pathological degrees of damage can be determined in internal organs, in real-time tomography. Ultrasound waves between 3.5 and 5.0 MHz are mainly used for observing organs in the abdominal lumen, and those between 5 and 15 MHz are used for observing superficial organs or tissues [1,3].

Cutting-edge imaging equipment, such as ultrasound diagnostic units (CT, MRI, and PET), have been developed and advances based on human anatomy. Research into ultrasound diagnostic units have been actively studied because they are non-invasive, they do not pose any risk of radiation exposure, they can be performed directly in the clinical setting, and they allow realtime observation [4]. The Ministry of Health and Welfare recently expanded the coverage of the National Health Insurance system to cover upper abdomen ultrasound scans from April 1^st, 2018, as a follow-up measure to protect citizens more closely.

A number of case studies have reported that Korean medical clinics employ ultrasound diagnostic units in clinical treatments. Oh et al [5] analyzed the trends of ultrasound diagnostic units in Korean medical care. However, they only reported the number of publications, the number of publications issued by institutions, the number of publications by journals, and the types of diseases. It is not known how many ultrasound diagnostic medical units are used in the clinical setting. The objective of this study was to evaluate the status of studies using ultrasound diagnostic units, who used them, and how they had been used. This information was retrieved using the Korean Medicine Advanced Searching Integrated System (OASIS).

Materials and Methods

Search method

This study retrieved abstracts and full-text publications that were registered with OASIS, or published on or prior to October 8^th, 2019. Three researchers independently searched for electronic journals in the OASIS. The search keywords used were “ultrasound” and “ultrasound in Korean.” The literature lists of the 3 researchers were merged after completing the literature search.

Selection criteria and outcome assessment

This review selected clinical studies using ultrasound diagnostic units. Each researcher selected or excluded literature independently. Any discrepancy was resolved by discussion between the researchers to decide whether the literature should be included or not. The selected studies were categorized by ultrasound diagnostic unit use, year of publication and then analyzed. Moreover, those using ultrasound diagnostic units were also analyzed.

Results

Description of the included studies

Sixty-nine studies were identified using the keyword “ultrasound,” and 34 studies were found using the term “ultrasound in Korean.” Twenty-nine duplicated studies were excluded which left 74 articles to be included in the review. Publications and case studies not using an ultrasound diagnostic unit were excluded. Following the first screening, 46 studies were identified, including studies evaluating related research trends. Upon examination of the full text 46 studies [5-50] that satisfied the selection criteria of this study were included in this review (Fig. 1).

Fig. 1.

Flowchart of trial selection process.

These 46 studies were categorized into changes in blood flow (Table 1), joints and muscles (Table 2), abdomen (Table 3), and other clinical applications and discussions (Table 4). Furthermore, the percentage of publications by year (Fig. 2) and the user (Fig. 3) are presented.

Table 1.

Measuring the Changes in Blood Flow by Ultrasonography.

Table 2.

Measuring Joints and Muscles by Ultrasonography.

Table 3.

Measuring Abdomen by Ultrasonography.

Table 4.

Other Clinical Application and Review by Ultrasonography.

Fig. 2.

The percentage of included studies by year.

Fig. 3.

The number and percentage of included studies by ultrasound user.

KMD, Korean medicine doctor; MT, medical technician; NA, not applicable; R, Roentgenologist; U, unknown.

Measuring changes in blood flow

Fifteen out of the 46 studies examined changes in blood flow. Among these 15 studies, 9 measured cerebral blood flow and evaluated treatment effects. Moreover, 5 studies measured the changes in blood flow observed during Korean medicine treatments. One study examined the changes in blood flow at the acupoints on the face of patients with facial paralysis.

Six of the 9 studies were conducted by medical technicians which measured cerebral blood flow and evaluated treatment effects, while 1 of the studies was performed by a roentgenologist. Two studies did not mention who conducted the examination.

Five studies measured the changes in blood flow during Korean medicine treatments. All of them confirmed the effects of the Korean medicine treatments on blood flow, using ultrasound, but no study mentioned who operated the ultrasound device.

The study that observed the changes in blood flow at the acupoints on the face of patients with facial paralysis, measured the observed changes using Doppler ultrasonography. It was measured by a Korean medicine doctor, who was trained by a specialist for 3 weeks (Table 1).

Joints and muscles

Twelve of the 46 studies examined joints and muscles in patients. Among these 12 studies, 8 studies were conducted to evaluate how to use ultrasonography efficiently for the treatment of joints and muscles. In 7 of the 8 studies, Korean medicine doctors conducted ultrasonography as the main medical practitioner, while 1 study did not mention who carried out the procedure. These 8 studies used ultrasonography while conducting acupuncture therapy and herbal acupuncture therapy. Four studies used ultrasonography to evaluate the condition of joints and muscles. These 4 studies used ultrasonography for examining joints, though they did not mention who conducted the examination (Table 2).

Abdomen

Fifteen of the 46 studies evaluated the abdomen of patients using abdominal ultrasonography (3.5 and 5.0 MHz). Three studies were conducted to ensure treatment accuracy by identifying the location and distance, during Korean medicine treatments. Six studies compared pre- and post-treatment ultrasonography for diagnosis and treatment. Two studies used ultrasound for the abdomen to determine treatment effects. Four studies evaluated gastric emptying measurements. Among the 3 studies for discerning location and distance, 2 studies were conducted by a Korean medicine doctor, and 1 study did not specify who conducted the procedure. Among the 6 studies comparing Korean medicine diagnosis and treatment, ultrasonography was conducted by a roentgenologist in 3 studies, and by a Korean medicine doctor in 2 studies, while 1 study did not specify the acting practitioner. The 2 studies which evaluated treatment effects, examined the treatment effects of Korean medicine treatments on patients with non-alcoholic fatty livers. A Korean medicine doctor examined the ultrasonography images directly in 1 study, while a roentgenologist examined them in the other study. All 4 studies on gastric emptying capability assessed the relationship between the Korean medicine diagnosis and gastric emptying capability, and none of these studies mentioned who conducted ultrasonography (Table 3).

Other clinical applications and review

One study out of the 46, covered other clinical applications, while 3 studies were literature reviews. The former presented the basis for the diagnosis of sinusitis using ultrasound, by comparing the X-ray of sinus and the ultrasonograph of the sinus, but it did not mention who conducted the procedure. The 3 literature review studies presented the status of ultrasound diagnostic device use in Korean medicine clinical treatments, provided a basis for utilizing ultrasound diagnostic devices for observing internal organs, and included a study on ultrasound-guided acupuncture (Table 4).

Discussion

As science and technology have developed, ultrasound waves have become useful in various fields such as construction [51], robotics [52], and beauty [53]. Ultrasound waves pose no harm to the human body and are also actively used in modern medicine. Although its history as a diagnostic imaging tool is shorter than that of other methods, it has made remarkable progress in a very short time, and has already been established as a diagnostic method. It has become one of the most important imaging modalities in modern medicine. In line with these advancements, ultrasound findings corresponding to various physiological and pathological conditions have become more accurately diagnosed. Accordingly, Korean medicine practitioners also actively employ ultrasonography in the diagnosis and clinical treatment of patients due to the legal restrictions on the use of ultrasonography in Korean medicine by Korean medicine doctors. The grounds for Korean medicine doctors to use ultrasonography is still weak. The objective of this study was to discuss and evaluate the studies utilizing ultrasound diagnostic units, who was the user of these units, as well how they have been used. This information was retrieved using OASIS. This study identified 46 studies [5-50] after conducting a literature search and report that 38 of the 46 studies were published in the last 10 years. It was also confirmed that ultrasonography related studies was an increasing trend. Among the 46 studies, a Korean medicine doctor led ultrasonography in 13 studies, a medical technician conducted the procedure in 6 studies, a roentgenologist carried it out in the course of 5 studies, and 19 of the studies did not specify who conducted the procedure. In other words, ultrasonography was chiefly conducted by Korean medicine doctors (28%), a more frequent occurrence than was found in studies conducted by medical technicians or roentgenologists. Considering that these studies were conducted mainly by Korean medicine doctors, those studies not specifying who carried out ultrasonography may have been performed by Korean medicine doctors, suggesting that ultrasonography was conducted by Korean medicine doctors in a greater total than 13 studies. The results implied that ultrasonography was actively used by Korean medicine doctors for clinical treatments.

Yin et al [20] showed blood flow at the acupoints on the face of the patients with facial paralysis after receiving 3 weeks of training, which suggested that Korean medicine doctors could use ultrasonography for their clinical treatment after receiving professional training of similar duration.

The 46 studies were composed of 15 studies on the changes in blood flow, 12 studies on joints and muscles, 15 studies on the abdomen, 1 study on other clinical applications, and 3 literature review studies. The studies related to the changes in blood flow measurement of cerebral blood flow, examining the treatment effects, and evaluating the effects of Korean medicine treatments by measuring changes in blood flow during the treatments. Studies related to joints and muscles consisted of studies that used ultrasound waves to increase the safety and reproducibility when applying acupuncture or herbal acupuncture to joints and muscles, as well as those for evaluating treatment effects following treatments. The studies related to abdominal ultrasound were primarily for identifying the distances between the needles and the abdominal organs in order to evaluate the safety of abdominal acupuncture, for the sake of understanding the correlation between Korean medicine treatments and the results of ultrasonography, and for determining treatment effects. Moreover, there were studies comparing X-ray and ultrasonography in diagnosing sinusitis and literature review studies. Overall, the results indicated that ultrasound waves were useful for evaluating the effectiveness of Korean medicine treatments and enhancing rigor and reproducibility during treatments.

Consequently, ultrasonography has been actively used in the clinical practice of Korean medicine, and it is a useful diagnostic tool for evaluating the effects of Korean medicine, and increasing reliability and reproducibility. However, special attention should be given to interpreting the results of this review because only publications retrieved from OASIS were included. Publications from international journals using international databases were not included. The aim of this review of ultrasonography use in Korean medicine treatments, was to encourage more diverse ultrasound studies in the future.

Conclusion

Ultrasonography has been actively used in clinical practice settings of Korean medicine, and it is a useful diagnostic tool for evaluating the effects of Korean medicine, as well as increasing the robustness and reproducibility of results. This review has provided the scope for broadening the use of ultrasound studies in the future.

Notes

The authors have no conflicts of interest to declare.

Acknowledgements

This study was supported by the Korea Institute of Korean Oriental Medicine (K18503).

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