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Carotid Artery Corrected Flow Time Measured by Ultrasonography as a Predictor of Hypotension After Induction of General Anesthesia

NCT02891772 · Status: WITHDRAWN · Type: OBSERVATIONAL

Last updated 2019-01-16

No results posted yet for this study

Summary

Hypotension often happens immediately after anesthetic induction. Particularly in 5-10 minutes after anesthetic induction it is reported to happen more frequently. Patients may have preexisting hypovolemia resulting from dehydration and impaired compensatory responses, which increase the risk. However, it is still challenging to assess intravascular volume status in spontaneously breathing patients before anesthetic induction. Recently, the measurement of corrected flow time in carotid artery was introduced as quite useful, simple and noninvasive for the evaluation of circulating blood volume. The aim of this study is to evaluate whether corrected carotid artery flow time as determined by ultrasonography in spontaneously breathing patients before general anesthesia can predict hypotension after induction.

Conditions

  • General Anesthesia Induction for Elective Surgery

Interventions

PROCEDURE

ultrasonographic measurement of corrected flow time(FTc) in carotid artery

Corrected carotid artery flow time is measured using 10-5 MHz linear probe on a portable ultrasound machine. On the two-dimensional image, the optimal image of the long-axis view is obtained at the left common carotid artery. The sample volume is placed on the center of the lumen, 2 cm proximal to the bulb, and a pulsed wave Doppler examination was performed. Then, cardiac cycle time and carotid flow time is measured. Carotid flow time is measured between the upstroke of the flow tracing and the dicrotic notch, and it is corrected for pulse rate by dividing flow time by the square root of the cardiac cycle time to calculate corrected carotid artery flow time (flow time/√cycle time). The blood pressure was taken before anesthetic induction and every two minutes after anesthetic induction till ten minutes after endotracheal intubation.

Sponsors & Collaborators

  • Yonsei University

    lead OTHER

Eligibility

Min Age
19 Years
Max Age
80 Years
Sex
ALL
Healthy Volunteers
No

Timeline & Regulatory

Start
2016-08-31
Primary Completion
2017-08-31
Completion
2017-08-31

Countries

  • South Korea

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02891772 on ClinicalTrials.gov