An interventional study of CC-FT Guided Fluid Management Group and Conventional Fluid Management Group in Hypotension (MeSH: D007022) and Aged, sponsored by Zhihong LU. Not yet recruiting. Open to participants aged 65 Years and older. Per ClinicalTrials.gov, last updated 2026-11-09.
Sponsored by Zhihong LU · Not applicable, Interventional, and Prevention
This study aims to find out whether using a simple ultrasound measurement of blood flow in the neck artery can help doctors decide how much fluid to give older patients before general anesthesia, and thereby reduce the drop in blood pressure that commonly occurs after anesthesia induction. Older adults are more likely to experience low blood pressure during anesthesia, and such drops have been linked to kidney injury, heart injury, and even death after surgery. Giving too little fluid can worsen organ blood supply, while giving too much can cause fluid overload, lung swelling, and heart strain. Currently, doctors often rely on static measures such as central venous pressure, or on invasive dynamic measures such as pulse pressure variation, but these have limited accuracy or require expensive equipment and invasive procedures. Carotid corrected flow time (FTc), measured non-invasively with ultrasound, reflects left ventricular preload and has shown promise for predicting fluid responsiveness, including in spontaneously breathing patients. However, evidence in older adults undergoing abdominal surgery remains limited to observational studies, and higher-level evidence from randomized trials is needed. We therefore plan a single-center, prospective, randomized, parallel-controlled trial in 70 patients aged 65 years or older scheduled for elective abdominal surgery under general anesthesia. Participants will be randomly assigned 1:1 to an FTc-guided prehydration group or a conventional fluid group. In the intervention group, if FTc falls below 340.7 ms, 250 mL of lactated Ringer's solution will be infused over 15 minutes, and FTc will be re-measured until it reaches at least 340.7 ms, in addition to a background infusion of 6 mL/kg/h started 30 minutes before induction. The control group will receive the same background infusion without FTc-guided adjustment. The primary outcome is the incidence of post-induction hypotension, defined as mean arterial pressure below 65 mmHg or a decrease of more than 20% from baseline within 15 minutes after induction. Secondary outcomes include the area under the curve of mean arterial pressure change from baseline during induction, intraoperative use of vasoactive agents, actual pre-induction fluid volume, postoperative pulmonary complications (pulmonary edema), acute kidney injury, myocardial injury, adverse events in the post-anesthesia care unit, time to first flatus and defecation, and all-cause mortality within 30 days after surgery.
Primary Hypothesis
Compared with conventional fluid management, carotid FTc-guided prehydration before anesthesia induction will reduce the incidence of post-induction hypotension in older patients undergoing elective abdominal surgery under general anesthesia.
885 studies on the registry are indexed under Hypotension; 195 are open to participants now.
This study's planned enrollment of 70 is below the median of 87 across 590 interventional studies indexed under Hypotension.
Browse Hypotension studies →Zhihong LU is the lead sponsor of 17 studies on the registry; 7 are open to participants now.
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Age ≥ 65 years;
Scheduled for elective abdominal surgery under general anesthesia.
Exclusion Criteria:
> III;
> 30 kg/m² or \< 18.5 kg/m²;
History of neck surgery or neck trauma;
History of peripheral arterial disease or arteriosclerosis, carotid artery stenosis exceeding one-third of the lumen, or significant anatomical variation of the carotid artery;
functional class > III;
History of cardiomyopathy or valvular heart disease;
Non-sinus rhythm;
Concomitant hypotension due to conditions such as septic shock;
Refusal to participate in the study.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
ASA physical status
The anaesthetists’ scale of health before surgery: I is healthy, II has a mild illness that is under control, III a severe one, IV a severe illness that is a constant threat to life. V and VI are used for the critically ill and for organ donors.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
BMI (body mass index)
Weight in kilograms divided by height in metres squared. Example: 70 kg and 1.75 m gives 70 ÷ (1.75 × 1.75) ≈ 22.9.
What counts as overweight or obesity differs between countries (some use lower cut-offs), so go by the range the study states.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
atients will receive fluid management guided by the Carotid Corrected Flow Time (CC-FT) index during anesthesia induction.
Other: CC-FT Guided Fluid Management Group
Patients will receive routine fluid management based on standard clinical parameters during anesthesia induction.
Other: Conventional Fluid Management Group
Patients will receive fluid management guided by the Carotid Corrected Flow Time (CC-FT) index during anesthesia induction.
Patients will receive routine fluid management based on standard clinical parameters during anesthesia induction.
ncidence of post-induction hypotension
Incidence of MAP \< 65 mmHg or a decrease of more than 20% from baseline
Time frame: defined as within 15 minutes after induction
No study locations are listed for this record.
Plan to share: Undecided
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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Zhihong LU