Clinical trial NCT06814054: Carotid Artery Corrected Flow Time and Inferior Vena Cava Collapsibility Index for Prediction of Hypotension After Induction of General Anesthesia in Geriatric Patients Undergoing Elective Surgery
Official title: Carotid Artery Corrected Flow Time and Inferior Vena Cava Collapsibility Index for Prediction of Hypotension After Induction of General Anesthesia in Geriatric Patients Undergoing Elective Surgery
Study type: OBSERVATIONAL
Overall status: NOT_YET_RECRUITING
Conditions: Geriatrics
Hypotension on Induction
General Anesthetic Drug Adverse Reaction
Elective Surgery
Lead sponsor: Tanta University
Sponsor class: OTHER
First posted: 2025-02-07
Enrollment: 189
Sex: ALL
Minimum age (years): 65
Standard ages: OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: PROSPECTIVE
Sampling method: PROBABILITY_SAMPLE
Study population: geriatric patients (65 years and above) (10) of either sex and ASA PS I to Ⅱ receiving general anesthesia for elective surgery, who fasted for at least 6 to 8 hours were recruited in this study

Brief summary: In this observational study, we will assess cFT by Carotid ultrasound and IVC collapsibility index for prediction of hypotension after induction of general anesthesia in geriatric patients undergoing elective surgery.

Detailed description: Following the onset of general anesthesia, hypotension is frequently observed, and intraoperative hypotension is linked to end organ damage following surgery, including cardiac ischemia and severe renal injury. postoperative end-organ damage depends on the duration and magnitude.

The incidence of hypotension after induction of general anesthesia varies and is influenced by the induction agent, patient characteristics, and the definition of hypotension.

Hypotension was defined by a 30% reduction in the SBP or 20% reduction in the MAP from baseline or an absolute SBP of less than 90 mm Hg and MAP of less than 65 mm Hg within 3 minutes after induction of general anesthesia.

Elderly people are more likely to experience hemodynamic fluctuation and hypotension due to the high prevalence of left ventricular diastolic failure, lower vascular reactivity and higher sensitivity to anesthetics. More significantly, older patients can't tolerate hypotension for a long time.

A variety of hemodynamic monitoring techniques have been used to predict post- anesthetic hypotension. Non-invasive cardiometry, ultrasound evaluation of fluid status, and pulse oximetry variables, such as the perfusion index and pulse variability index, were utilized.

Zhang and Critchley demonstrated that preoperative hypovolemia predicted postinduction hypotension as determined by the inferior vena cava (IVC) diameter and IVC collapsibility index.

In many clinical situations, volume-responsive patients have been identified using Doppler-derived metrics such as the peak blood flow peak velocity variation (ðVpeak) and the common carotid artery corrected flow time (cFT).

The carotid artery Doppler measures provide several benefits, including being noninvasive and being technically simple to obtain due to the carotid artery's superficial nature. Since the common carotid artery cFT is unaffected by respiratory attempts, it can also be used to assess a patient's volume responsiveness when they are breathing on their own.

Eligibility criteria: Inclusion Criteria:

* American Society of Anaesthesiologists Physical Status I to Ⅱ
* receiving general anesthesia for elective surgery
* fasted for at least 6 to 8 hours were recruited in this study

Exclusion Criteria:

* • patients who refused to participate in the study

  * American Society of Anaesthesiologists Physical Status Ⅲ or Ⅳ
  * Patients with a history of peripheral arterial diseases or atherosclerosis
  * Patients with body mass index of greater than 30 kg/m2
  * Patients with arrhythmia or cardiomyopathy
  * Chronic obstructive pulmonary disease (COPD)
  * baseline systolic arterial pressure (SAP) ≥ 180 mmHg or \< 90mmHg
  * Any episode of desaturation or difficult intubation during general anasethia induction

Primary outcomes:
measure: the diagnostic efficacy of cFT by Carotid ultrasound and IVC collapsibility index in prediction of hypotension after induction of general anesthesia in geriatric patients
timeFrame: immediate preoperative peroid before the induction of general anesthesia
Secondary outcomes:
Other outcomes:
Locations:
Study officials:
affiliation: tanta university, faculty of medicine
name: tarek Mostafa
role: PRINCIPAL_INVESTIGATOR
References: