Effect Of Different Conditions Of Holding The Breath On The Results Of Renal Duplex Sonography

Objective:We have found out that the results of renal duplex sonography(RDS)variate in different conditions of holding the breath.We hope to clarify the regular pattern of this phenomenon and to remind us to attach importance to the breath in RDS.Methods:From October 2017 to March 2018,we recruited 45 healthy volunteers and performed normalized RDS examinations on them.All of the examinations were executed at the condition of natural breath holding and deep breath holding and the trunks of renal arteries were evaluated with lateral positions.Then we compared and analyzed the two-dimensional echogram and pulsed-wave Doppler ultrasound at the different conditions of holding the breath.Results:Compared with the natural breath,when the volunteers held the deep breath,the peak systolic velocity(PSV)and the end diastolic velocity(EDV)of the right renal arteries increased 16.34±16.17cm/s(P<0.001)and 4.43±5.93 cm/s(P<0.001),and the angle between the initial segment of the right renal arteries and the distal end of the abdominal arteries decreased 10.11± 15.04°(P<0.001);the peak systolic velocity(PSV)and the end diastolic velocity(EDV)of the left renal arteries increased 12.21±22.24cm/s(P=0.001)and 2.73±7.15 cm/s(P=0.019),and the angle between the initial segment of the left renal arteries and the distal end of the abdominal arteries decreased 11.73±27.74°(P=0.011).There was no significant difference in the resistant index(RI)of the trunks of bilateral renal arteries between the natural breath and the deep breath.And the mean change of PSV,EDV of bilateral renal artery trunks was of no significant relevance to the change of the angle between the initial segment of the bilateral renal arteries and the distal end of the abdominal arteries.Conclusion:The RDS results regularly change with the conditions of holding the breath,as there is higher PSV and EDV at the deep breath,which has been demonstrated to be independent of the angle between the renal artery and the abdominal artery.It is concluded that breath can make a difference in RDS,which is of potential value in the standardization of the RDS examination.