Usefulness of a Novel Ultrasound Transducer for Continuous Monitoring Treadmill Exercise Echocardiography to Assess Coronary Artery Disease

Nakashiki, Kenichi; Kisanuki, Akira; Yoshifuku, Shiro; Yuasa, Toshinori; Takasaki, Kunitsugu; Kuwahara, Eiji; Yu, Bin; Uemura, Takeshi; Mizukami, Naoko; Hamasaki, Shuichi; Minagoe, Shinichi

doi:10.1253/circj.70.1297

Cited by 5 publications

(6 citation statements)

References 40 publications

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“…It showed feasibility of the device for monitoring the patients for a longer period of time (up to 12 h), however only one cross-sectional view of LV could be obtained [ 18 ]. Therefore, this transducer could not provide sufficient visualization to perform SE [ 19 ].…”

Section: Discussionmentioning

confidence: 99%

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Continuous hands-free monitoring of echocardiographic exercise test using probe fixation device

et al. 2022

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Background Stress echocardiography has been widely used in clinical practice for decades and has recently gained even more importance in diagnostic approaches to ischemic heart disease. However, it still has numerous limitations. Despite advantages of physical exercise as most physiologic stressor, it is impossible to continuously monitor the cardiac function during treadmill test and difficult to maintain an optimal acoustic window during cycle ergometer exercise tests. The aim herein, is to assess the feasibility of probe fixation for use during exercise echocardiography. Methods Forty-eight subjects (47 men, mean age 42 ± 17 years, 25 healthy volunteers, 23 patients with suspected coronary artery disease) were included in this study. All subjects underwent exercise stress test on treadmill (32 cases) or cycle ergometer (16 cases). Both sector and matrix probes were used (in 17 and 31 tests, respectively). The semi-quantitative quality of acquired apical views were assessed at each stage using a four-point grading system. Results The mean time required for probe fixation was 9 ± 2 min. At baseline, 10 patients had at least one apical window of quality precluding reliable analysis. Twenty-five patients required probe repositioning during exercise (more often on a treadmill). During peak exercise quality of images in all views declined, but for diagnostic purposes it remained sufficient in 29 patients. Thus, 76% of performed tests (60% study population) had sufficient image quality. Conclusions Probe fixation offers the possibility of continuous acquisition of echocardiographic images during physical exercise. The device is suitable almost exclusively for male patients and in some patients requires repositioning.

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Section: Discussionmentioning

confidence: 99%

“…Nakashiki et al [ 19 ] tested another transducer for treadmill SE. Their transducer was attached to the chest with rubber belts and had a possibility of being moved in any direction.…”

Section: Discussionmentioning

confidence: 99%

Continuous hands-free monitoring of echocardiographic exercise test using probe fixation device

et al. 2022

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“…Image processing was performed using a Mac Pro (Apple, US, CPU 3.7 GHz, Quad-Core Intel Xeon, Memory 64 GB). All reconstructed 3D images had a voxel size of 0.29 × 0.29 × 0.29 mm 3 . Figure 4 shows three cross-sectional images and three time sequence images (M-mode images) of the ac-…”

Section: Equipment and Softwarementioning

confidence: 99%

“…Chandraratna et al [1,2] and Nakashiki et al [3] attempted hands-free monitoring of cardiac ultrasound images for approximately 10 min during a treadmill test. They rst developed an ultrasound transducer that acquired images while being attached to the chest, and used the transducer to monitor cardiac images during a treadmill test.…”

Section: Introductionmentioning

confidence: 99%

Monitoring of Portal Vein by Three-dimensional Ultrasound Image Tracking and Registration: Toward Hands-free Monitoring of Internal Organs

Iori

Tobisawa

Toshiki

et al. 2020

ABE

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Ultrasound is a convenient non-invasive imaging modality used for the diagnosis or detection of various diseases and assessment of therapeutic effects. However, when imaging internal organs, the ultrasound probe must be handled by an operator. The ability to perform hands-free ultrasound imaging of internal organs is likely to offer an unprecedented advantage in various situations such as internal organ monitoring during exercise tests and prolonged monitoring. Toward this end, we have developed a new method of hands-free monitoring using three-dimensional (3D) ultrasound and used this method in portal vein monitoring, which is important for functional evaluation of hepatic and gastrointestinal systems. In previous studies, we developed a handmade probe holder and used it to capture images of the portal vein, using image tracking and registration to compare the same position of the portal vein. In this study, we rst used an abdomen phantom to assess image tracking qualitatively and quantitatively. After validating the method on the phantom, we monitored the portal vein in three healthy subjects using our 3D ultrasound method. Image tracking and registration of the portal veins in three subjects were successfully performed of ine. Finally, respiratory analysis and vein diameter measurement were performed based on the image tracking results. The respiratory analysis quanti ed the respiration-induced portal vein movements. The vein diameter showed changes that might be induced by respiration and heartbeat. These results indicate that our 3D ultrasound method is a potentially useful tool for handsfree monitoring of internal organs.

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“…Ultrasound transducer fixation could resolve these exercise stress echocardiography issues. In existing hands-free echocardiography studies, novel probes were developed that were fixated into an external housing with screws, which employed rubber belts or adhesive patches for skin attachment [21,22]. However, for clinical applications, an easily and quickly applicable fixation apparatus is required.…”

Section: Introductionmentioning

confidence: 99%

A demonstration of high field-of-view stability in hands-free echocardiography

Sjoerdsma

Fixsen

Schoots

et al. 2020

Cardiovasc Ultrasound

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Background: Exercise stress echocardiography is clinically used to assess cardiovascular diseases. For accurate cardiac evaluation, a stable field-of-view is required. However, transducer orientation and position are difficult to preserve. Hands-free acquisitions might provide more consistent and reproducible results. In this study, the field-of-view stability and variability of hands-free acquisitions are objectively quantified in a comparison with manually obtained images, based on image structural and feature similarities. In addition, the feasibility and consistency of hands-free strain imaging is assessed. Methods: In twelve healthy males, apical and parasternal images were acquired hands-free, using a fixation device, and manually, during semi-supine exercise sessions. In the final ten seconds of every exercise period, the image structural similarity and cardiac feature consistency were computed using a steerable pyramid employing complex, oriented wavelets. An algorithm discarding images displaying lung artifacts was created. Hands-free strain consistency was analyzed. Results: Hands-free acquisitions were possible in 9 of the 12 subjects, whereas manually 10 out of 12 could be imaged. The image structural similarity was significantly improved in the hands-free apical window acquisitions (0.91 versus 0.82), and at least equally good in the parasternal window (0.90 versus 0.82). The change in curvature and orientation of the interventricular septum also appeared to be lower in the hands-free acquisitions. The variability in field-of-view was similar in both acquisitions. Longitudinal, septal strain was shown to be at least as consistent when obtained hands-free compared to manual acquisitions. Conclusions: The field-of-view was shown to be more or equally stable and consistent in the hands-free data in comparison to manually obtained images. The variability was similar, thus respiration-and exercise-induced motions were comparable for manual and hands-free acquisitions. Additionally, the feasibility of hands-free strain has been demonstrated. Furthermore, the results suggest the hands-free measurements to be more reproducible, though further analysis is required.

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Usefulness of a Novel Ultrasound Transducer for Continuous Monitoring Treadmill Exercise Echocardiography to Assess Coronary Artery Disease

Cited by 5 publications

References 40 publications

Continuous hands-free monitoring of echocardiographic exercise test using probe fixation device

Continuous hands-free monitoring of echocardiographic exercise test using probe fixation device

Monitoring of Portal Vein by Three-dimensional Ultrasound Image Tracking and Registration: Toward Hands-free Monitoring of Internal Organs

A demonstration of high field-of-view stability in hands-free echocardiography

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