Not Yet RecruitingNot Applicable

The Role of Left Ventricular Outflow Tract (LVOT) Velocity-time Integral (VTI) and Respiratory Variability at Peak Rate (Vpeak) in Predicting Hypotension After General Anesthesia Induction

100 participantsStarted 2025-08-20

Plain-language summary

Preoperatively, patients will undergo transthoracic echocardiography measurements approximately 15-30 minutes before induction. TTE will be performed on all patients by an experienced observer; the echocardiography device will be equipped with an S4-2 transducer (4-2 MHz frequency range) in the left lateral decubitus position. VTI and Vpeak values of the LVOT were measured from manually drawn contours using pulsatile wave Doppler technique in the apical five-chamber view. The Doppler beam was aligned with the aortic blood flow, and the signal was captured at an appropriate angle (\<20°). The maximum (VTImax) and minimum (VTImin) VTI, as well as the maximum (Vpeakmax) and minimum (Vpeakmin) Vpeak values, were determined over three respiratory cycles. ΔVTI was calculated with the following formula: ΔVTI = \[2 × (VTImax - VTImin) / (VTImax + VTImin)\] × 100%. ΔVpeak was calculated with the following formula: ΔVpeak = \[2 × (Vpeakmax - Vpeakmin) / (Vpeakmax + Vpeakmin)\] × 100%. These parameters were analyzed to evaluate the hemodynamic status of patients and estimate fluid responsiveness. Patients with a 30% decrease from baseline in SBP and a decrease in MAP below 60 mmHg in the first 10 minutes after anesthesia induction were considered to have hypotension. Patients were divided into two groups: "with" and "without" hypotension.

Who can participate

Age range

18 Years – 75 Years

Sex

ALL

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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

Exclusion criteria

. Patient is pregnant
. Post-cardiac surgery
. Severe pulmonary hypertension
. Severe valvular disease
. Hypertrophic or dilated cardiomyopathy
. Presence of acute myocardial infarction
. Patients with severe visual or hearing impairment/impairment
. ASA physical status IV or V

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

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Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

lvot-vtı

Timeframe: 1 hour

Trial details

NCT IDNCT07121699

SponsorAydin Adnan Menderes University

Sponsor typeOTHER

Study typeOBSERVATIONAL

Primary completion2025-08-20

View on ClinicalTrials.gov More Hypotension on Induction trials