Basics of Doppler Ultrasound: Understanding Arterial and Venous Flow
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Basics of Doppler Ultrasound
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Basics of Doppler Ultrasound: Understanding Arterial and Venous Flow
- 1. Basics of Doppler Ultrasound Dr.Akshai George Paul
- 6. Normal Flow in Arteries and Veins
- 7. Arteries
- 8. • Doppler spectrum is a time velocity wave form that rapresents variation in intravascular blood flow in cardiac cycle. • Time is in horizontal axis and in vertical axis is frequency shift(velocity)
- 15. Hyperemic monophasic flow is seen in • Fever • Exercise • Temporary arterial occlusion by BP Cuff
- 17. Veins
- 19. 1.Spontaneity • Spontaneous flow with out augmentation
- 20. 2.Phasicity • Flow changes with respiration
- 22. 3.Compression • Normal vein is able to collapse showing its patency • Non Compressible-Thrombosis
- 23. 4.Augmentation • Applying compression distal to the site of examination • If there is increase venous flow transmitted to the area of evaluation- suggests no occlusive thrombus exists.
- 24. 5.Valsalva • It increases intraabdominal and intrathoracic pressure • It causes decreased venous return • Highlighting any connection between source of reflux and refluxing vessel
- 25. THANK YOU