A non-invasive cardiac output measurement as an alternative to the test bolus technique during CT angiography

Aim To investigate the association between a non-invasive cardiac output (CO) measurement and the scan delay, as derived from a test bolus injection protocol. The secondary objective was to determine which factors affect the relationship between the CO and scan delay. Materials and methods Fifty-five patients referred for a contrast-enhanced (thorax-)abdomen CT examination were included in this feasibility study. A test bolus examination was performed prior to the abdominal CT. During the test bolus injection, the CO of the patient was measured using a non-invasive finger-cuff measurement. Associations were analysed using linear regression analyses. Age, gender, height, weight, and blood pressure were included as potential confounders. Results Linear regression analysis showed a negative and significant association between CO and delay. The regression formula was as follows: scan delay (seconds) = 26.8–1.6 CO (l/min), with a 95% CI between −2.3 and −1.0 (p<0.001). Weight appeared to be a confounder in this relation, and gender and blood pressure were effect modifiers. There was no interaction between scan delay and age, height and weight. Conclusions There is a negative and significant association between the non-invasive CO measurement and the CT scan delay; however, to validate these findings a larger cohort study is needed to investigate whether the non-invasively determined scan delay is as accurate as the use of a test bolus

Ultrasound of the shoulder. Efficacy studies

Contains fulltext : 77578.pdf (publisher's version ) (Open Access)RU Radboud Universiteit Nijmegen, 15 juni 2010Promotor : Kiemeney, L.A.L.M. Co-promotores : Jager, G.J., Waal Malefijt, M.C. de300 p

Epiploic appendicitis: ultrasound and CT characteristics

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Pseudoaneurysmus: US-Guided Compression Therapy with Color and Power Doppler

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Schouderechografie; methode en klinische significantie

Contains fulltext : 22955___.PDF (publisher's version ) (Open Access

Excisional biopsy of impalpable soft tissue tumors

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From the RSNA refresher courses: US of the rotator cuff: pitfalls, limitations, and artifacts.

Contains fulltext : 50296.pdf (publisher's version ) (Closed access)High-resolution ultrasonography (US) has gained increasing popularity as a diagnostic tool for assessment of the soft tissues in shoulder impingement syndrome. US is a powerful and accurate method for diagnosis of rotator cuff tears and other rotator cuff abnormalities, provided the examiner has a detailed knowledge of shoulder anatomy, uses a standardized examination technique, and has a thorough understanding of the potential pitfalls, limitations, and artifacts. False-positive sonographic findings of rotator cuff tears can be caused by the technique (anisotropy, transducer positioning, acoustic shadowing by the deltoid septum), by the anatomy (rotator cuff interval, supraspinatus-infraspinatus interface, musculotendinous junction, fibrocartilaginous insertion), or by disease (criteria for diagnosis of rotator cuff tears, tendon inhomogeneity, acoustic shadowing by scar tissue or calcification, rotator cuff thinning). False-negative sonographic findings of rotator cuff tears can be caused by the technique (transducer frequency, suboptimal focusing, imaging protocol, transducer handling), by the anatomy (nondiastasis of the ruptured tendon fibers, posttraumatic obscuration of landmarks), by disease (tendinosis, calcifications, synovial proliferation, granulation or scar tissue, bursal thickening, massive rotator cuff tears), or by patient factors (obesity, muscularity, limited shoulder motion)

Spinal arteriovenous malformation

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Posttraumatic pain and/or dysfunction of the shoulder. Value of sonography

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