Blood Vessel Perforation
Conditions
Keywords
anterolateral thigh flap, Finder, Virtual Augmented Reality, computerized tomography, color doppler ultrasound
Brief summary
Oral and maxillofacial region is an important anatomical part of human body, responsible for chewing, swallowing, language, expression, breathing and other physiological functions. The tissue defects in this area not only seriously affect the physiological function, but also lead to facial deformity and aesthetic damage, affecting the quality of life of patients. The anterolateral thigh flap has become one of the main methods for defect repair due to its large tissue volume and high survival rate, and one of the key steps to ensure a high survival rate is the location of the perforator. How to find the perforator more accurately by improving the detection scheme or locating the perforator according to the anatomical structure, and guide the preparation and cutting of the flap, is the main direction of current research. This study intends to conduct a exploratory study on perforator localization of flap , and explore its effectiveness and accuracy through sensitivity and specificity. In this study, a total of 24 patients with maxillofacial defects caused by tumors, trauma and other reasons requiring anterolateral femoral flap repair were included, and the perforator branch of femoral anterolateral flap was positioned preoperatively by Virtual augmented reality combined with perforator positioning device and color Doppler ultrasound. After the anterolateral thigh flap was prepared, the incision was closed in the donor area of the leg, and the flap was transplanted free to the maxillofacial defect area for repair. The sensitivity, specificity, positive predictive value, negative predictive value, distance difference and odds ratio of the two methods were calculated respectively, and the differences of each evaluation index between the two groups were compared, mainly to evaluate the sensitivity and specificity between the two groups.
Interventions
DIAGNOSTIC_TESTVirtual Augmented Reality Combined With Finder
After CT examination, the computer carried out three-dimensional reconstruction of blood vessels, and input the CTA data into Cinematic Anatomy reconstruction software to analyze blood vessels, Muscles and other tissues are reconstructed in three dimensions. Before the operation, the Finder is used to restore the position of the thigh during CTA examination. The Hololens is used to match the reconstructed three-dimensional image with the perforator locator and the thigh. Before the operation, the pedicles of the descending branches of the lateral arteries and the perforating vessels are marked on the skin of the thigh to achieve the positioning and marking of the perforating branches.
Sponsors
Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University
Study design
Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
DIAGNOSTIC
Masking
NONE
Intervention model description
After performing CTA examination, input the CTA data into Cinematic Anatomy reconstruction software to analyze blood vessels, muscles and other tissues are reconstructed in three dimensions. Before the operation, the Finder is used to restore the position of the thigh during CTA examination. The Hololens is used to match the reconstructed three-dimensional image with the Finder and the thigh. Before the operation, the pedicles of the descending branches of the lateral arteries and the perforating vessels are marked on the skin of the thigh to achieve the positioning and marking of the perforating branches.
Eligibility
Sex/Gender
ALL
Age
18 Years to 80 Years
Healthy volunteers
No
Inclusion criteria
1. All patients with oral and maxillofacial defects caused by malignant tumors or trauma require anterior lateral femoral skin flap repair after surgery 2. There is no history of leg trauma and surgery is feasible 3. No clinically significant positive signs were found in physical examination 4. No chronic or current illnesses such as heart, liver, pancreas, spleen, kidney, digestive tract, respiratory, blood, nervous system, etc 5. No abnormalities found in electrocardiogram (ECG) and X-ray film 6. Hepatitis B surface antigen (HBSAg), anti hepatitis C antibody (anti HCV), anti human immunodeficiency virus antibody (anti HIV), and negative Treponema pallidum (TP) 7. No clinically significant abnormalities were found in vital signs, blood routine, urine routine, blood biochemistry, and blood pregnancy tests 8. The patient voluntarily participated in this study and signed an informed consent form
Exclusion criteria
1. Have a history of leg injury or surgery 2. Significant abnormalities in blood routine, heart, lung, liver, and kidney functions, insufficient compensatory function, or severe systemic diseases 3. Pregnant or lactating women, or those planning to conceive within six months 4. Individuals with a history of mental illness who cannot cooperate with the examination 5. Individuals with allergic constitution or known allergies to contrast agent ingredients 6. The patient or guardian refuses to sign a written consent form
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Sensitivity | during the operation | The percentage of actual perforating branches that are correctly determined as the perforating branches according to this research method (true positive rate) is calculated as follows: number of true positive perforations /(number of true positive perforations + number of false negative perforations) =TP/(TP+FN) |
| Specificity | during the operation | The percentage of actual no perforations correctly judged as no perforations according to this research method (true negative rate) is calculated as follows: true negative number /(true negative perforations + false positive perforations) =TN/(TN+FP) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| negative predictive value | during the operation | The proportion of true negative in the number of negative non-penetrating counts determined by the research method; If the diagnostic method to be evaluated is judged negative, the probability that the subject has no negative is calculated as follows: PV- = number of true negative penetrations/total number of controls =TN/(FN+TN) |
| Youden Index | during the operation | Defined as the total ability to find the correct perforating branches and to judge the absence of perforating branches, is the sum of sensitivity and specificity minus 1 |
| positive predictive value | during the operation | The proportion of true positivity in the number of positive perforations determined by this research method reflects the probability that the subject does have perforations when the diagnostic method to be evaluated is determined to be positive. The calculation formula is as follows: PV+ = number of true positive perforations/total number of perforations =TP/(TP+FP) |
Countries
China
Outcome results
None listed