Due to the characteristics and environmental factors, electrocardiogram (ECG) signals are usually interfered by noises in the course of signal acquisition, so it is crucial for ECG intelligent analysis to eliminate noises in ECG signals. On the basis of wavelet transform, threshold parameters were improved and a more appropriate threshold expression was proposed. The discrete wavelet coefficients were processed using the improved threshold parameters, the accurate wavelet coefficients without noises were gained through inverse discrete wavelet transform, and then more original signal coefficients could be preserved. MIT-BIH arrythmia database was used to validate the method. Simulation results showed that the improved method could achieve better denoising effect than the traditional ones.
ObjectiveTo explore the effectiveness of the usage of artificial bone of tricalcium phophate in sellar floor reconstruction after transsphenoidal microsurgery for pituitary adeoma. MethodsBetween January and December 2014, 85 patients with pituitary adema underwent transsphenoidal microsurgery, and the clinical data were retrospectively analyzed. "Sandiwich" was used for sellar floor reconstruction in 46 cases (control group), and "sandiwich" combined with the artificial bone of tricalcium phophate in 39 cases (trial group). There was no significant difference in gender, age, disease duration, size of tumor, invasiveness, and the degree of damage to the sellar floor between 2 groups (P>0.05). ResultsTotal removal and subtotal removal of tumors were achieved in 39 cases and 7 cases of the control group, and in 33 cases and 6 cases of the trial group, showing no significant difference between 2 groups (Z=-1.303, P=0.193). Cerebrospinal leakage occurred in 8 cases of the control group and in 10 cases of the trial group during operation, showing no significant difference (Z=-1.748, P=0.080). The case number of cerebrospinal leakage in the control group (4 cases) was significantly more than that in the trial group (0) after operation (P=0.020). The time of gauze removal in the trial group (3 days) was significant shorter than that in the control group[(4.3±1.6) days] (t=2.236, P=0.033). The patients were followed up 3-14 months in the control group and 5-13 months in the trial group. No cerebrospinal leakage occurred during follow-up. ConclusionSellar floor reconstruction with artificial bone of tricalcium phophate is safe, and it can reduce cerebrospinal leakage and shorten the time of gauze removal.
ObjectiveTo compare the effectiveness of external fixation and volar locking compression plate in the treatment of distal radius fractures of type C. MethodsBetween March 2012 and March 2013, 122 patients with distal radius fractures of type C were enrolled in the prospective randomized study. Fractures were treated by external fixation in 61 patients (external fixation group) and by open reduction and internal fixation using a volar locking compression plate in 61 patients (plate group). There was no significant difference in age, gender, fracture side, weight, height, body mass index, fracture type, and interval of injury and operation between 2 groups (P>0.05). The blood loss, operation time, hospitalization days, fracture union time, wrist function, and complications were compared between 2 groups. And the quality of reduction was observed, including volar tilting angle, ulnar deviation, radial height, and articular reduction. ResultsThe blood loss, operation time, and hospitalization days in plate group were significantly higher than those in external fixation group (P<0.05). All of the patients in both groups were followed up 12-28 months. Postoperative complications occurred in 4 patients (6.6%) of external fixation group (pin tract infection in 2 cases and radial nerve neuritis in 2 cases) and in 5 patients (8.2%) of plate group (wound infection in 1 case, carpal tunnel syndrome in 2 cases, and tendon rupture in 2 cases), showing no significant difference between 2 groups (P=0.500). The X-ray films showed fracture healing in all patients of 2 groups; the union time of plate group was significantly longer than that of external fixation group (P<0.05). At last follow-up, there was no significant difference in ulnar deviation and radial height between 2 groups (P>0.05), but the volar tilting angle of plate group was significantly larger than that of external fixation group (P<0.05). There was no significant difference in wrist function and articular reduction between 2 groups (P>0.05). ConclusionFor distal radius fractures of type C, the use of external fixation or volar locking compression plate can obtain satisfactory clinical outcomes, but the external fixation has the advantages of less invasion, shorter hospitalization days, minor complications, and faster fracture union.