Predictability of Preoperative Carotid Artery Corrected Flow Time for Hypotension After Spinal Anesthesia in Patients Undergoing Cesarean Section
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|ClinicalTrials.gov Identifier: NCT03631329|
Recruitment Status : Recruiting
First Posted : August 15, 2018
Last Update Posted : May 9, 2019
The purpose of this study was to investigate the incidence of hypotension after spinal anesthesia in patients undergoing cesarean section as predicted by preoperative carotid artery corrected flow time measured by Doppler ultrasound. Before entering the operation room, Two inspectors perform two measurements of carotid artery corrected blood flow time respectively, and an average of the four measurements is calculated and analyzed. At this time, the patient's posture is supine, and the head is turned about 30 degrees to the left. Corrected blood flow time (FTc) is measured using carotid ultrasound as previously described by Blehar and colleagues. Corrected blood flow time is calculated by Bazett's formular and Wodey's formular by evaluating a single cycle after several successive cycles have reached a stable and acceptable quality level.
The occurrence of hypotension is recorded from the spinal anesthetic injection until the fetus is delivered.
The definition of hypotension after spinal anesthesia is that the systolic blood pressure drops to 80 mmHg, less than 75% of the baseline value, or even if it does not meet the former criteria, symptoms that are consistent with hypotension (dizziness, dizziness, dyspnea, nausea or vomiting).
|Condition or disease||Intervention/treatment|
|Cesarean Section||Diagnostic Test: Doppler sonographic measurement|
|Study Type :||Observational|
|Estimated Enrollment :||38 participants|
|Official Title:||Predictability of Preoperative Carotid Artery Corrected Flow Time for Hypotension After Spinal Anesthesia in Patients Undergoing Cesarean Section|
|Actual Study Start Date :||September 4, 2018|
|Estimated Primary Completion Date :||August 2020|
|Estimated Study Completion Date :||August 2020|
Uncomplicated cesarean delivery
Uncomplicated singleton full-term parturients undergoing cesarean delivery
Diagnostic Test: Doppler sonographic measurement
First, place a 4.5-12.0 MHz linear array transducer vertically on the neck with the probe marker facing the patient's head. A long axis B-mode image of the right common carotid artery is obtained at the lower border of the thyroid cartilage. The sample volume is then placed in the center of the lumen located approximately 2 cm proximal to the carotid bifurcation. Next, pulsed wave Doppler tracing is performed in the arterial blood flow. The cycle time using the calliper function in an ultrasonic machine is obtained by measuring the interval between heartbeats at the beginning of the Doppler blood flow upstroke and the Flow time is measured as the time from the beginning of the systolic upstroke to the dicrotic notch.
- Occurrence of Hypotension [ Time Frame: from the spinal anesthetic injection until the fetus is delivered. ]The definition of hypotension after spinal anesthesia is that the systolic blood pressure drops to 80 mmHg, less than 75% of the baseline value , or even if it does not meet the former criteria, symptoms that are consistent with hypotension (dizziness, dizziness, dyspnea, nausea or vomiting) .
- The systolic blood pressure difference [ Time Frame: from the spinal anesthetic injection until the fetus is delivered. ]The most significant difference in systolic blood pressure dropped
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03631329
|Contact: Yong Seon Choi, MD, PhD||82-2-2228-2412||YSCHOI@yuhs.ac|
|Korea, Republic of|
|Department of Anesthesiology and Pain Medicine, Anesthesia and Pain Research Institue, Yonsei Universiy College of Medicine||Recruiting|
|Seoul, Korea, Republic of, 03722|
|Contact: Yong Seon Choi, MD, Ph.D 82-2-2228-2420 email@example.com|