A Study of Doppler Waveform Using Pulsatile Flow Model.
10.3348/jkrs.1997.37.2.225
- Author:
Hye Won CHUNG
1
;
Myung Jin CHUNG
;
Jae Hyung PARK
;
Jin Wook CHUNG
;
Dong Hyuk LEE
;
Byoung Goo MIN
Author Information
1. Department of Radiology, Seoul National University College of Medicine.
- Publication Type:Original Article
- Keywords:
Ultrasound(US), Doppler studies;
Ultrasound(US), experimental
- MeSH:
Acceleration;
Compliance;
Constriction, Pathologic;
Flowmeters;
Glass;
Heart, Artificial;
Pulsatile Flow*;
Rubber
- From:Journal of the Korean Radiological Society
1997;37(2):225-232
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
PURPOSE: Through the construction of a pulsatile flow model using an artificial heart pump and stenosis to demonstrate triphasic Doppler waveform, which simulates in vivo conditions, and to evaluate the relationship between Doppler waveform and vascular compliance. MATERIALS AND METHODS: The flow model was constructed using a flowmeter, rubber tube, glass tube with stenosis, and artificial heart pump. Doppler study was carried out at the prestenotic, poststenotic, and distal segments; compliance was changed by changing the length of the rubber tube. RESULTS: With increasing proximal compliance, Doppler waveforms show decreasing peak velocity of the first phase and slightly delayed acceleration time, but the waveform itself did not change significantly. Distal compliance influenced the second phase, and was important for the formation of pulsus tardus and parvus, which without poststenotic vascular compliance, did not develop. The peak velocity of the first phase was inversely proportional to proximal compliance, and those of the second and third phases were directly proportional to distal compliance. CONCLUSION: After constructing this pulsatile flow model, we were able to explain the relationship between vascular compliance and Doppler waveform, and also better understand the formation of pulsus tardus and parvus.
