Hemodynamic Changes and Trigeminocardiac Reflex During Bimaxillary Orthognathic Surgery
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- This is an observational study: the protocol does not assign a study treatment.
- Who it may be relevant to
- Registry conditions: Orthognathic Surgery, Trigeminocardiac Reflex, Hemodynamic. Basic parameters: 18 years — 40 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- Turkey (Türkiye)
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Observational Evaluation of Hemodynamic Parameters Using Routine Intraoperative Monitoring Data in Patients Undergoing Bimaxillary Orthognathic Surgery
Overview
This observational study aims to evaluate hemodynamic changes occurring during bimaxillary orthognathic surgery using routinely collected intraoperative monitoring data. Heart rate, systolic and diastolic blood pressure, mean arterial pressure, and oxygen saturation will be recorded during different stages of surgery as part of standard clinical care. The study will also evaluate the occurrence of the trigeminocardiac reflex (TCR) and its association with patient characteristics and surgical stages. No additional interventions, laboratory tests, or procedures will be performed beyond routine clinical practice. The findings may contribute to the early recognition and management of intraoperative hemodynamic changes during orthognathic surgery.
Detailed description
This study will use a prospective observational cohort design. Patients undergoing bimaxillary orthognathic surgery at the Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Kırıkkale University, will be included. Intraoperative hemodynamic data routinely collected as part of standard clinical monitoring will be recorded and analyzed. Hemodynamic parameters, including systolic blood pressure, diastolic blood pressure, heart rate, and peripheral oxygen saturation, will be recorded at 5-minute intervals throughout the surgical procedure.Hemodynamic parameters will be evaluated according to the different stages of surgery. The maxillary surgical stages will include anesthesia induction, incision, bone cutting, pterygoid intraoral incision, right and left lateral wall osteotomies, medial and lateral nasal wall osteotomies, maxillary down-fracture, maxillary mobilization, plate fixation, and suturing. The mandibular surgical stages will include anesthesia induction, incision, lingula incision, external oblique incision, osteotomy, mandibular separation, mandibular mobilization, plate fixation, and suturing.The occurrence of trigeminocardiac reflex (TCR) will be assessed simultaneously with the hemodynamic parameters recorded at each surgical stage. TCR will be classified as mild when heart rate and/or blood pressure decreases by 10-20% from baseline values and as severe when the decrease exceeds 20% and/or is accompanied by cardiac rhythm disturbances. Patients with and without TCR will be compared with respect to demographic characteristics and intraoperative hemodynamic changes observed during different surgical stages. No additional interventions, laboratory tests, or invasive procedures will be performed beyond routine clinical care. The findings of this study are expected to improve the understanding of intraoperative hemodynamic responses and contribute to the early recognition and management of TCR during bimaxillary orthognathic surgery.
Primary outcome measures
- Number of Participants With Trigeminocardiac Reflex (TCR) [Time frame: During surgery]
Secondary outcome measures (4)
- Systolic Blood Pressure [Time frame: During surgery]
- Diastolic Blood Pressure [Time frame: During surgery]
- Heart Rate [Time frame: During surgery]
- Peripheral Oxygen Saturation [Time frame: During surgery]
Eligibility criteria
Inclusion criteria
- Adults aged 18-40 years.
- Patients with an indication for bimaxillary orthognathic surgery.
- Patients with complete routine intraoperative hemodynamic monitoring data.
- Patients who provide written informed consent to participate in the study.
Exclusion criteria
- Patients without an indication for bimaxillary orthognathic surgery.
- Individuals younger than 18 years or older than 40 years.
- Patients with known cardiovascular disease, including arrhythmia, heart failure, coronary artery disease, or other significant cardiovascular disorders.
- Patients with systemic diseases, including diabetes mellitus, hypertension, thyroid disorders, or other significant systemic conditions.
- Patients with diagnosed psychiatric disorders.
- Patients with incomplete or irregularly recorded intraoperative hemodynamic monitoring data.
- Individuals who refuse to participate or do not provide written informed consent.
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Cohort
Study locations
Turkey (Türkiye) · 1 center
- Kırıkkale Univesity Faculty of Dentistry — Kirikkale
Identifiers
NCT: NCT07726251 · Decision No: 2026.04.66