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Ultrasound Device (ultrasound + device)

Distribution by Scientific Domains

Medical Sciences	100%

Kinds of Ultrasound Device

handheld ultrasound device

Selected Abstracts

Triage Patients with Suspected Pulmonary Embolism in the Emergency Department Using a Portable Ultrasound Device

ECHOCARDIOGRAPHY, Issue 5 2008
Nicolas Mansencal M.D.
The diagnosis of pulmonary embolism (PE) is difficult, despite validated diagnostic models. We sought to determine the value of a portable ultrasound device for triage of patients with suspected PE referred to the emergency department, using simplified echo criteria. We prospectively studied 103 consecutive patients with suspected PE, referred to our emergency department. After D-dimer screening, 76 patients were prospectively enrolled in this ultrasound study and underwent helical chest tomography, transthoracic echocardiography, and venous ultrasonography. Among patients with PE (n = 31), a right ventricular dilation was detected in 17 patients (55%), a direct visualization of clot in the lower limbs was present in 18 patients (58%), and 8 patients (26%) had both right ventricular dilation and deep venous thrombosis. The sensitivity and specificity of a combined ultrasound strategy using echocardiography and venous ultrasonography were respectively 87% (95% confidence interval 74% to 96%), and 69% (95% confidence interval 53% to 82%). The sensitivity of this combined strategy was significantly improved as compared to venous ultrasonography alone (P = 0.01) or echocardiography alone (P = 0.005). In patients with dyspnea or with high clinical probability of PE, this combined strategy was particularly relevant with high sensitivities (respectively 94% and 100%). Echocardiography combined with venous ultrasonography using a portable ultrasound device is a reliable method for screening patients with suspected PE referred to an emergency department, especially in patients with dyspnea or with high clinical probability. [source]

Evaluation of Peripheral Vascular Endothelial Function with a Portable Ultrasound Device

ECHOCARDIOGRAPHY, Issue 8 2006
Alawi A. Alsheikh-Ali M.D.
Endothelial function can be assessed noninvasively by imaging the brachial artery with ultrasound before and during reactive hyperemia. However, the standard ultrasound equipment typically used for this purpose is limited by size and expense of the machinery. In this study, we compared the ability of a portable ultrasound device to standard ultrasound equipment to visualize the brachial artery for purposes of assessing peripheral vascular endothelial function. The portable device provided comparable imaging of the brachial artery at rest and during hyperemia to that of standard ultrasound technology. These findings support the feasibility of noninvasive evaluation of peripheral endothelial function in the ambulatory setting. [source]

A Hand-Carried Personal Ultrasound Device for Rapid Evaluation of Left Ventricular Function: Use After Limited Echo Training

ECHOCARDIOGRAPHY, Issue 4 2003
Kristina Lemola
A hand-carried personal ultrasound device (HCPUD) may be used for rapid cardiac screening by physicians with limited echo training. Our objective was to determine the accuracy of rapid HCPUD evaluation of left ventricular (LV) size and function when used by a Cardiology Fellow. Forty-five patients underwent an HCPUD exam using a 2.4-kg device with a 2- to 4-MHz curved transducer and color power Doppler (SonoSite). The results were compared with sonographer-performed and echocardiographer-interpreted exams using conventional equipment. The HCPUD exam lasted 6 ± 2 minutes. There was 100% agreement between HCPUD and conventional echo on qualitative assessment of LV systolic function. Comparing the HCPUD and conventional linear measurements of left ventricular end-diastolic dimension (LVEDD) and of interventricular septal (IVS) thickness: LVEDD is HCPUD = 0.94 conventional ,0.2,r = 0.82, P < 0.0001; IVS is HCPUD= 0.59conventional+0.6, r = 0.69, P < 0.0001. Thus, an HCPUD can effectively be used after limited training to rapidly screen for qualitative abnormalities of LV systolic function. Quantitative measurements of smaller structures with the HCPUD are more challenging. (ECHOCARDIOGRAPHY, Volume 20, May 2003) [source]

The Pocket Echocardiograph: Validation and Feasibility

ECHOCARDIOGRAPHY, Issue 7 2010
Benjamin C. Culp M.D.
Background: A new, miniaturized ultrasound device, the pocket echocardiograph (PE), is highly portable and can be carried inside a lab-coat pocket. Studies of this device are limited and have not examined the use by novice echocardiographers. We hypothesize that a novice echocardiographer can use PE to produce interpretable cardiac images, and that both novice and expert echocardiographers can use PE to accurately quantify ejection fraction. Methods: Unselected subjects (n = 40) in an echocardiography laboratory underwent blinded formal transthoracic echocardiography (TTE) and PE (Acuson P10, Siemens, Mountain View, CA, USA). A cardiology fellow with 2 months of echocardiography training acquired PE images. The fellow and an experienced echocardiographer interpreted the PE studies offline in a blinded fashion. To assess adequacy, studies were graded as technically adequate, limited, or inadequate. A visual estimation of ejection fraction was made. Comparisons were made to the formal reported TTE. Results: Subjects were heterogeneous, 43% male; age 64 ± 17 years, and ejection fraction 52.4%± 12.3%. All PE studies were interpretable, and the vast majority of PE and TTE images were considered technically adequate (77.5% and 85% respectively; P = 0.32). Ejection fraction showed a good correlation, bias, and limits of agreement for the fellow's interpretation (r = 0.78, ,5.9%, ±16.6%) with stronger association for the experienced echocardiographer (r = 0.88, ,0.8%, ±11.4%). Conclusion: Novice echocardiographers using the PE can produce adequate quality images. Both expert and novice echocardiographers can use PE to quantify ejection fraction over a broad range of patients. The device's low cost and portability may greatly expand the availability of bedside echocardiography for routine or urgent cardiovascular assessment. (Echocardiography 2010;27:759-764) [source]

Diagnostic Accuracy of Handheld Echocardiography for Evaluation of Aortic Stenosis

ECHOCARDIOGRAPHY, Issue 5 2010
Arnd Schaefer M.D.
Background: Symptomatic severe aortic stenosis is associated with increased mortality and morbidity. Early identification of these patients by echocardiography is crucial. We conducted this study to evaluate a handheld ultrasound device (HCU) in patients with suspected severe aortic stenosis (AS) in comparison to a standard echocardiography device (SE). Methods: A HCU (Vivid I; GE Healthcare) and a SE device (Philips iE 33) were used to evaluate 50 consecutive patients with suspected severe AS. Two consecutive echocardiographic studies were performed by two experienced and blinded examiners using HCU and SE device. AS was graded by mean transaortic pressure, aortic valve area (AVA), and indexed AVA (AVA adjusted for body surface area). Results: Mean difference for mean transaortic gradient, AVA and indexed AVA for the SE and HCU device were 1.28 mmHg (,0.70 to 3.26 mmHg), ,0.02 cm2 (,0.06 to 0.01 cm2), and ,0.01 cm2/m2 (,0.03 to 0.01 cm2/m2), respectively. Discrepancies between both devices were not associated with misinterpretation of the degree of AS. Conclusion: Our study demonstrates that HCU can be used to evaluate patients with suspected AS. (ECHOCARDIOGRAPHY 2010;27:481-486) [source]

Triage Patients with Suspected Pulmonary Embolism in the Emergency Department Using a Portable Ultrasound Device

Evaluation of Peripheral Vascular Endothelial Function with a Portable Ultrasound Device

A Hand-Carried Personal Ultrasound Device for Rapid Evaluation of Left Ventricular Function: Use After Limited Echo Training

Asymptomatic leukocyturia and the autonomic nervous system in women

GERIATRICS & GERONTOLOGY INTERNATIONAL, Issue 2 2009
Yoshimasa Igari
Background: The present study sought to investigate the relationship between asymptomatic leukocyturia (ASL) and autonomic nervous function by power spectral analysis of the R-R intervals in women. Methods: One hundred and forty-two female outpatients aged 23,91 years were studied. We regarded ASL to be present if two consecutive samples were found to have 10 or more leukocytes/high-power field at ×400 magnification in a centrifuged midstream urine sample. The R-R intervals of all subjects were measured by the wavelet transform analysis system. This system detected R-R variation data distributed in two bands: low-frequency power (LF) (0.04,0.15 Hz) and high-frequency power (HF) (0.15,0.40 Hz). The ratio of LF to HF (LF/HF) was also determined. Post-void residual urine volume was measured using an automated, compact 3-D ultrasound device. Results: The patients with ASL had diabetes mellitus more frequently than those without ASL. Residual urine volume was significantly higher in the former than in the latter, while the HF values in both a recumbent position and a standing position were significantly lower in the former than in the latter (P = 0.003, P = 0.001, respectively). However, there were no significant differences in LF or LF/HF values in either a recumbent or a standing position between the two groups. The HF values in both a recumbent position and in a standing position were independent indicators of ASL, even after adjustment for age, diabetes mellitus and residual urine volume. Conclusion: The present study reveals the relationship between ASL and impairment of the parasympathetic nervous system in women. [source]

Handheld ultrasound device for detection of non-opaque and semi-opaque foreign bodies in soft tissues,

JOURNAL OF CLINICAL ULTRASOUND, Issue 4 2003
Angela D. Levy MD
Abstract Purpose The aim of this study was to determine whether a portable handheld ultrasound device can be used to visualize non-opaque and semi-opaque foreign bodies in soft tissues and to characterize their sonographic appearance. Methods Twenty-two fragments composed of various natural and man-made materials and ranging from 4 to 20 mm in the maximum longitudinal dimension were embedded into 2 thawed turkey breasts. Two sonographers who were unaware of the number, dimensions, and locations of the fragments used a handheld ultrasound device to detect and characterize the fragments on the basis of their surface echogenicity and acoustic shadowing. The sonographic appearance of each fragment was compared with its actual characteristics. Results All 22 embedded fragments were successfully identified and localized on sonography. Surface echogenicity and acoustic shadowing varied among the fragments. For some fragments, the sonographically measured maximum longitudinal dimension differed substantially from the actual dimension. Conclusions Use of a portable handheld ultrasound device is effective for the detection of foreign bodies with a diameter greater than 4 mm in soft tissues. The sonographic appearances of non-opaque and semi-opaque foreign bodies vary in their patterns of surface echogenicity and acoustic shadowing. © 2003 Wiley Periodicals, Inc. J Clin Ultrasound 31:183,188, 2003 [source]

Quantitative gray-scale analysis in skeletal muscle ultrasound: A comparison study of two ultrasound devices

MUSCLE AND NERVE, Issue 6 2009
Sigrid Pillen MD
Abstract Muscle ultrasound is a useful technique to detect neuromuscular disorders. Quantification of muscle echo intensity (EI) using gray-scale analysis is more reliable and more sensitive compared with visual evaluation of the images. We devised a method to reliably use EI normal values established with one ultrasound device for use with another device. Based on measurements in a dedicated phantom and in 7 healthy subjects, a conversion equation was calculated to convert the mean EI. The reliability of this equation was next evaluated in a follow-up study of 22 healthy children. Mean muscle EI could be reliably converted from one ultrasound device to another. This allows for normal values obtained with one device to be used with other devices, which is an important step forward toward the use of quantitative muscle ultrasound in daily clinical care. Muscle Nerve, 2009 [source]

Anton Banko, the Slovenian inventor behind the success of Charles Kelman

ACTA OPHTHALMOLOGICA, Issue 2008
M HAWLINA
Behind the success story of phacoemulsification that started with Charles Kelman, there was an ingenious engineer that helped him to create the first clinically useful apparatus. Anton Banko was born in a Slovenian family in Istria, very close to actual venue of EVER meeting. He studied engineering and electrics in Ljubljana and later moved to United Sates where he worked in the field of ultrasound instruments for dental use Cavitron company as the director of research and development. Charles Kelman turned to him with a request to construct an ultrasound device for cataract removal and their first joint US patent No. 3589363 was filed on 25th July 1967. A year later, Anton Banko established his own company in New York, named Surgical Design, and the company produced a series of very reliable and successful phaco machines that are still used worldwide. Anton Banko continued to develop many other patents used in ocular surgery including instrument for vitrectomy that he patented in 1969 after which a combined Mackool/Heslin Ocusystem machine was designed. Sadly , he died of incurable disease soon after the success of his company which since then is led by his son William. Anton Banko's wish to donate one of the machines to the University Eye Hospital in Ljubljana was conweyed by his family. Due to his legacy, surgeons from Slovenia started to use phacoemulsification as early as in 1989 after training in the wetlab of Surgical Design company. Anton Banko remains one of the giants of instrumentation in ocular surgery with Slovenian origins. [source]

A Pilot Study of the Clinical Impact of Hand-Carried Cardiac Ultrasound in the Medical Clinic

ECHOCARDIOGRAPHY, Issue 6 2006
Lori B. Croft M.D.
Background: Small, hand-carried ultrasound devices have become widely available, making point-of-care echocardiograms (echos) accessible to all medical personnel as a means to augment and improve the increasingly inefficient physical examination. This study was designed to determine the clinical utility of hand-carried echo by medical residents in clinical decision making. Methods: Nine residents underwent brief, practical echo training to perform and interpret a limited hand-carried echo as an integral component of their office examination. The residents' hand-carried echo consisting of four basic views to define left ventricular (LV) function and wall thickness, valvular disease, and any pericardial effusions was compared to one performed by a level III echocardiographer. Results: Seventy-two consecutive medical clinic patients were enrolled with an average image acquisition time of 4.45 minutes. Residents obtained diagnostic images in 94% of the cases and interpreted them correctly 93% of the time. They correctly identified 92% of the major echo findings and 78% of the minor findings. Their diagnosis of LV dysfunction, valvular disease, and LV hypertrophy improved by 19%, 39%, and 14% with hand-carried echo compared to history and physical alone. Management decisions were reinforced in 76% and changed in 40% of patients with the use of hand-carried echo. Conclusion: This study demonstrates that it is possible to train medical residents to perform an effective and reasonably accurate hand-carried echo during their physical examination, which can impact clinical management. [source]

Meta-analysis of the diagnostic accuracy of transesophageal echocardiography for assessment of atherosclerosis in the ascending aorta in patients undergoing cardiac surgery

ACTA ANAESTHESIOLOGICA SCANDINAVICA, Issue 9 2008
B. VAN ZAANE
Background: Stroke after cardiac surgery may be caused by emboli emerging from an atherosclerotic ascending aorta (AA). Epiaortic ultrasound scanning (EUS), the current ,gold' standard for detecting AA atherosclerosis, has not gained widespread use because there is a lack of optimized ultrasound devices, it lengthens the procedure, it endangers sterility, and there is a false belief by many surgeons that palpation is as sensitive as EUS. Furthermore there is no clear evidence proving that the use of epiaortic scanning changes outcome in cardiac surgery. Various researchers investigated the ability of transesophageal echocardiography (TEE) to discriminate between the presence and absence of AA atherosclerosis. It is acknowledged that TEE has limited value in this, but it has never been supported by a meta-analysis estimating the true diagnostic accuracy of TEE based on all quantitative evidence. We aimed to do this using state-of-the-art methodology of diagnostic meta-analyses. Methods: We searched multiple databases for studies comparing TEE vs. EUS for detection of atherosclerosis. A random-effects bivariate meta-regression model was used to obtain summary estimates of sensitivity and specificity, incorporating the correlation between sensitivity and specificity as well as covariates to explore heterogeneity across studies. Results: We extracted six studies with a total of 346 patients, of whom 419 aortic segments were analyzed, including 100 segments with atherosclerosis [median prevalence 25% (range 17,62%)]. Summary estimates of sensitivity and specificity were 21% (95% CI 13,32%) and 99% (96,99%), respectively. Conclusions: Because of the low sensitivity of TEE for the detection of AA atherosclerosis, a negative test result requires verification by additional testing using epiaortic scanning. In case of a positive test result, AA atherosclerosis can be considered as present, and less manipulative strategies might be indicated. [source]