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| The value of color Doppler ultrasonography in the diagnosis and assessment of#br#
congenital hypertrophic pyloric stenosis |
| MA Sui-hong, LIU Jian-hua, YANG Yu-wen, WEI Hong-qin, XIAO Shu-yi, HU Zhi-wen |
| Department of Ultrasound, Guangzhou First People’s Hospital, Guangzhou 510180, China |
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Abstract Objective: This paper aims at using color Doppler flow imaging(CDFI) and pulse wave(PW) spectrum analysis technology to observe the blood flow of canals pyloricus and the blood flow rate and so on in congenital hypertrophic pyloric stenosis(CHPS), objective to investigate the clinical significance and value of Doppler ultrasonography in the diagnosis and assessment of CHPS. Method: The study enrolled 65 cases of CHPS infants and 50 infants without CHPS served as control group. CDFI was done to reveal the distribution feature of blood flow in each layer of the pyloric mucosal canals and the blood flow grade of muscular layer and mucosal layer. PW was done to measure the blood flow rate and frequency analysis. In addition, the muscle layer of CHPS group was divided into 3 groups according to the thickness, and the relationship between the thickness of the muscle layer and the parameters mentioned above was compared. Results: The distribution feature of blood flow in each layer of pyloric canal mucosa was observed clearly by CDFI examination in the CHPS group. The mean grade of flow in the muscular layer was 2.83±0.38. The blood flow maximal velocity(Vmax) of muscular layer was (16.96±0.91) cm/s, and the resistance index(RI) was 0.68±0.33. The thickness of muscle layer in 65 CHPS was positively related to age, weight, diameter of pyloric canal, Vmax and RI, there was no correlation with pyloric tube length. There was no significant difference between the first groups and the second groups in blood flow classification, Vmax and RI, and the blood flow was more abundant. The blood flow of the third groups was lower, and the rate of Vmax and RI increased. Conclusion: CDFI combined with color Doppler artifacts technique is proved to be effective to observe the distribution feature and blood flow grade in each layer of pyloric canal in CHPS patients. Vmax and RI are used to estimate the severity of pyloric stenosis. This method provides the evidence for judging the degree of pyloric stenosis clinically, and furnishes the basis of therapy along with its clinical significance and good application value.
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Received: 25 August 2017
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