Objectives: To evaluate the treatment results of severe traumatic brain injury without intracranial hematoma by decompressive craniectomy. Methods: An uncontrolled intervention study on 45 patients with severe traumatic brain injury, no intracranial hematoma, high intracranial pressure above 20 mmHg, unresponsive to medical therapy, and operated decompressive craniectomy at Viet Duc University Hospital from May 2017 to December 2022. Research variables: Age, gender, cause of the accident, preoperative GCS, pulse and blood pressure before surgery, and CT images before and 3 months after surgery. Comparing treatment results between groups. Results: 45 patients were studied, including 42 males and 3 females; the oldest age was 78, and the lowest was 6 years old; traffic accidents accounted for the majority of 86.7%; daily-life accidents was 8.9%; GCS before surgery: 3 - 5 points (55.6%), GCS: 6 - 8 points (44.4%); GCS = 8 points (8.9%). The mean ICP was: 40.09 ± 10.37 mmHg. Results when patients were discharged: 9 patients were dead and 36 patients were alive. Conclusion: In the treatment results of decompression craniectomy on patients with a severe traumatic brain injury without intracranial hematoma, the mortality rate, vegetative state, and severe sequelae are still high.
The geometric dimension and shape of microchannels that are formed during surface texturing are widely studied for applications in flow control, and drag and friction reduction. In this research, a new method for controlling the deformation of U channels during micro-rolling-based surface texturing was developed. Since the width of the U channels is almost constant, controlling the depth is essential. A calibration procedure of initial rolling gap, and proportional-integral PI controllers and a linear interpolation have been applied simultaneously to control the depth. The PI controllers drive the position of the pre-U grooved roll as well as the rolling gap. The relationship between the channel depth and rolling gap is linearized to create a feedback signal in the depth control system. The depth of micro channels is studied on A2021 aluminum lamina surfaces. Overall, the experimental results demonstrated the feasibility of the method for controlling the depth of microchannels.
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