Related Experiment Video
Updated: Jan 30, 2026

Electromagnetic Navigation Transthoracic Nodule Localization for Minimally Invasive Thoracic Surgery
Published on: May 4, 2022
Blood loss and operative time associated with orthognathic surgery utilizing a novel navigation system in cleft lip
Chi-Yu Tsai1, Yu-Jen Chang1, Te-Ju Wu1
1Department of Craniofacial Orthodontics, Department of Dentistry, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan.
Purpose:
This retrospective study evaluated the volume of blood loss and operative time associated with management of nongrowing patients with cleft lip and palate (CLP) using bimaxillary orthognathic surgery (OGS) designed by a three-dimensional (3D) computer-assisted simulation and navigation for orthognathic surgery (CASNOS) system.
Methods:
This study included 53 skeletal Class III nongrowing patients with unilateral CLP who underwent bimaxillary OGS using either the CASNOS protocol (n = 30) or the traditional two-dimensional (2D) method (n = 23). The skeletal parameters of jaw-bone components, the levels of hemoglobin (Hb) and hematocrit (Hct) were measured before and after surgery. The estimated blood loss and actual blood loss (ABL) were also calculated.
Results:
The two groups did not differ significantly with regard to the demographic parameters (age, gender, and body mass index), the preoperative skeletal parameters and surgical changes of jaw-bone components. The mean ABL of the CASNOS group was significantly lower than that of the control group (915.6 ± 280.5 vs. 1204.9 ± 201.0 ml, p < 0.001), and the changes in Hb and Hct level also followed a similar pattern in both groups. The mean operative time was significantly shorter in the CASNOS group compared with the control group (384.2 ± 48.5 vs. 469.0 ± 94.9 min, p < 0.001).
Conclusion:
This study demonstrated that the application of the 3D CASNOS approach in OGS for the management of complicated Class III nongrowing patients with CLP significantly shortened the operative time and reduced ABL in comparison with the traditional 2D methods.
Related Concept Videos
Line Loss
Line loss impacts power delivery efficiency in a balanced three-phase circuit. The symmetry in such a circuit simplifies the...
Reducing Line Loss
With a step-up transformer at the source, the voltage is increased, thereby reducing the current in the transmission lines since power loss in...
Energy Losses in Transformers
There are four main reasons for energy losses in transformers.
The first cause can be the high resistance of the...
Major Losses in Pipes
Fluid flow can be classified as laminar or turbulent, primarily based on the Reynolds number. This dimensionless number reflects the relative influence of inertial to viscous...
Minor Losses in Pipes
Valves play a significant role in generating minor losses by obstructing or redirecting the fluid flow. When a valve is closed or partially closed, it restricts the flow...
Operational Amplifiers

