[Simulation of inferior turbinate reduction using computational fluid dynamics methods]

Objective:Two computational fluid dynamic (CFD) models of unilateral inferior turbinate reductions (ITR) were constructed and investigate the influences of aerodynamic consequences.Method:A unilateral hypertrophic inferior turbinate CFD model wasestablished. Two kinds of methods in removing of tissue bulk along the length of the hypertrophic inferior turbinate were used,and we got the model B and the model C. Nasal airflow distribution were computed before and after simulated unilateral inferior turbinate reduction in use of Fluent 6.3.26.Result:Simulated two kinds of ITR resulted in enlargement in the cross-section area of inferior nasal meatus, 0.36 cm² of the model B and 0.89 cm² of the model C in average. Model C produced a less reduction in intranasal pressures (approximately 3 Pa) than the model B and the original model which are the same as approximately 8 Pa. More air was predicted to flow in the affected nasal passage in the model C (approximately 80 ml/s) than the model B and the original model. Airspeed in the anterior valve region was improved significantly and more vortices happened in the model C.Conclusion:The model C is significantly better than the model B in restoring normal anatomy and ventilation physiological of the nasal cavity. So, in ITR recoverying normal anatomy structure of the nasal has decisive significance.

[Evaluation of the effect of Nasopore on nasal packing in functional endoscopic sinus surgery]

Objective:To investigate the effect of Nasopore on nasal packing in functional endoscopic sinus surgery.Method:A total of 117 chronic rhinosiunsitis with or without nasal polyps patients undergone bilateral functional endoscopic sinus surgery and finished follow up visit were recruited. In accordance with various nasal packing materials in operation, patients were divided into Nasopore group, Sorbalgon group, Merocel group and Sorbalgon combined Mercel group. The VAS score was measured and differences were observed in patients of four groups in terms of subjective symptoms,post-operation adverse reaction and recovery of mucosa of operative nasal cavity in 2,4,8 and 12 weeks.Result:①The postoperative VAS symptoms score regarding nasal obstruction, nasal pain, head pressure feeling and discomfort in removal of the nasal packing in Nasopore group were significantly better than those in the other groups(P<0.05).②In Nasopore group,incidences of adverse reactions in epiphora, dysphagia, bleeding after removal nasal packing,surrounding mucosa scratches, nasal packing incarceration were significantly lower than that in the other groups(P<0.05). The incidences of fever,sneezing,bleeding in operation day and faint when removing nasal packing in four groups had no statistical differences(P> 0.05).③The postoperative Lund-Kennedy endoscopic mucosa morphology score in 2,4,8 and 12 weeks in four groups had no statistical differences(P> 0.05), and in each group the score was significantly lower as time changes(P<0.05).Conclusion:The Nasopore packing has definite hemostatic efficacy,little postoperative discomfort and nice mucosal healing outcome as well in patients after functional endoscopic sinus surgery.It indicates that Nasopore is an effective and reliable packing material in FESS.

[The changes of GFAP, PCNA after brain contusion: an immunohistochemical study in forensic pathology]

After the model of experimental brain contusion was set up, the changes of GFAP, PCNA were studied by immunohistochemistry SP method combined with image quantity analysis. After contusion, the gray degrees and areas of GFAP-positive cells increased significantly at the 3rd hour, reached the highest level in the 4th day and kept until the 7th day. PCNA-positive cells appeared in the 12th hour, simultaneously, their gray degrees tended to increase and positive areas tended to decrease. It showed regular changes of GFAP, PCNA with various survival times, and these changes were useful in the diagnosis of brain contusion especially in the period from the second to 7th day after injury. The numbers of astrocytes increased and reached the highest level in the 3rd day after contusion while the reactive proliferation of astrocytes is only a minor phenomenon.