Why the study?
Does Doppler ultrasonography accurately detect complete central occlusion in patients with suspected upper limb venous thrombosis when gray-scale US is non-diagnostic?
Does Doppler ultrasonography accurately detect complete central occlusion in patients with suspected upper limb venous thrombosis when gray-scale US is non-diagnostic?
Doppler US waveform analysis of cardiac pulsatility and respiratory phasicity is useful for detecting central venous occlusion when direct visualization is not possible.
May aid detection of central venous occlusion when direct imaging fails; hypothesis-generating pending prospective validation.
In 21 consecutive patients, the authors analyzed changes in venous Doppler waveforms of damped or diminished cardiac pulsatility and respiratory phasicity. Each patient was suspected of having upper limb venous thrombosis, but thrombus was not visible at gray-scale ultrasonography (US) in the subclavian and brachiocephalic veins. US findings were compared with phlebographic findings. The results show that US can be used to establish the presence or absence of thrombosis in the distal portion of the brachiocephalic or subclavian veins, which are inaccessible to direct insonation.
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Berman et al. (1999) studied this question.
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