Relationship between compression time and long-term hypoesthesia in primary trigeminal neuralgia treated with percutaneous balloon compression

Percutaneous balloon compression is a surgical method for the treatment of trigeminal neuralgia, but one of the surgical parameters, compression time, is inconclusive. To investigate the effect of compression time during balloon compression on long-term postoperative hypoesthesia in patients with primary trigeminal neuralgia and to provide guidance on relevant parameters for balloon compression in the treatment of primary trigeminal neuralgia, we conducted a nested case-control study. Patients with primary trigeminal neuralgia treated by balloon compression from March 2013 to September 2013 were divided into case group and control group according to whether there were still symptoms of hypoesthesia at present. The relationship between the compression time of balloon compression and long-term hypoesthesia was analyzed. A total of 289 trigeminal neuralgia patients treated with percutaneous balloon compression were included in this study. Multivariate logistic regression showed that compression time was significantly correlated with long-term hypoesthesia (OR = 1.91, 95% CI = 1.13-3.23, P = 0.02), and compression time was greater than one. The risk of hypoesthesia in the long-term when the compression time is longer than 1 min is 1.93 times that of 1 min. PBC is a safe and effective surgical method, and the long-term hypoesthesia is related to the compression time during operation. The longer the compression time during operation, the greater the risk of long-term hypoesthesia.

The effect of resting and compression time post-centrifugation on the characteristics of platelet rich fibrin (PRF) membranes

OBJECTIVE

To evaluate the effect of resting and compression time after centrifugation on the physical properties of platelet rich fibrin (PRF) membranes, and to provide optimal guidance regarding the clinical preparation of PRF.

MATERIALS AND METHODS

A total of 12 volunteers enrolled in this study divided into 2 groups equally. For each volunteer, 6 tubes of 10 mL venous whole blood was drawn. To evaluate the influence of resting time after centrifugation, PRF clots were taken out 0, 1, 3, 5, 7, and 10 min from tubes following centrifugation, and then the weight, size, maximum stress, and maximum strain of each group were measured. To evaluate the influence of compression time on the preparation of PRF membranes, the weight ratio of PRF membranes to PRF clots was calculated by compression for 10 s, 30 s, 60 s, 90 s, 120 s, and 180 s, respectively. Scanning electron microscopy was performed to observe the cross-linking of the fibers within membranes, and the maximum stress and strain of PRF membranes were tested followed by stress-strain curve analysis.

RESULTS

The weight and volume of PRF clots and PRF membranes increased in size and weight reached the top at 3 min, followed by a decrease after 7-min resting. The maximum strain of the PRF membranes after 10 min decreased significantly compared to the 3-min and 5-min groups. The maximum stress was found at 3 min followed by a statistical decrease when resting time went on. Scanning electron microscopy demonstrated that the internal fibrous structure of the PRF membranes was looser when the compression time was less than 60 s when comparing the 90-s group. The maximum stress of PRF membranes was shown using a wait period of 3 min post-centrifugation followed by compression for 120 s.

CONCLUSION

The findings from the present study demonstrate that the time post-centrifugation of PRF membranes showed a maximum weight, volume, and mechanical properties after resting for 3-5 min in the tube post-centrifugation followed by a compression time of 120 s.

CLINICAL RELEVANCE

Although research to date has focused primarily on centrifugation protocols, this study revealed for the first time that the resting time post-centrifugation greatly affected the mechanical properties of PRF. This study demonstrated that the resting and compression time after centrifugation influences the mechanical strength of PRF membranes, which might explain differences in PRF characteristics prepared by different clinicians that may provide a standard guide for preparation of PRF membranes.