Study on Hemodynamic Changes of Venous Catheter before and after Birth
Objective To investigate the changes of venous catheter hemodynamics before and after birth of normal full-term gestational age neonates(37-41 weeks)in order to determine the time node of venous catheter closure.Methods A total of 100 newborns of normal full-term gestational age from March 2021 to August 2022 were selected as the study objects(3 cases were closed on the day of birth without venous catheter data).Within 7 days,66 cases of venous catheter closure were included in the closed group,and 31 cases of incomplete catheter closure were included in the open group.The closed group was followed up until the venous catheter closure,and the closing time was recorded.Color Doppler ultrasound was used in both groups to analyze the data of intravenous catheter,umbilical vein and inferior vena cava before birth,and intravenous catheter,portal vein and inferior vena cava for 7 days after birth.The peak blood flow velocity and average blood flow of the intravenous catheter before birth and the average peak blood flow velocity and average blood flow of the intravenous catheter af-ter birth were compared between the two groups.The difference of blood flow between umbilical vein and inferior vena cava be-fore birth and between inferior vena cava and portal vein after birth were compared between the two groups.The latest closing time of venous catheter in the unclosed group was observed.Results The peak blood flow velocity,blood flow and the differ-ence between umbilical vein and inferior venous flow in the closed group were lower than those in the closed group(P＜0.05).The mean peak blood flow velocity and mean blood flow in the closed group were lower than those in the unclosed group(P＜0.01).There was no significant difference between the closed group and the unclosed group in the blood flow of the inferior vena cava and portal vein after birth(P＞0.05).The latest closing time of venous catheter in the unclosed group was 39 days.Conclusion The greater the difference of blood flow between the umbilical vein and the inferior vena cava be-fore birth,the faster the blood flow rate and the greater the blood flow rate of the venous catheter,and the more difficult it is to close the venous catheter after birth.After birth,the peak blood flow velocity and blood flow in the venous catheter gradual-ly decreased,and the venous catheter pressure gradually decreased,which was one of the reasons for the closure of the venous catheter.The closing time node of venous catheter was 39 days in 100 cases.
NewbornFull-termDuctus venosusClosing time nodeBlood flowPeak blood flow velocityHemo-dynamics
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