Electrocardiogram (ECG) signals are susceptible to be disturbed by 50 Hz power line interference (PLI) in the process of acquisition and conversion. This paper, therefore, proposes a novel PLI removal algorithm based on morphological component analysis (MCA) and ensemble empirical mode decomposition (EEMD). Firstly, according to the morphological differences in ECG waveform characteristics, the noisy ECG signal was decomposed into the mutated component, the smooth component and the residual component by MCA. Secondly, intrinsic mode functions (IMF) of PLI was filtered. The noise suppression rate (NSR) and the signal distortion ratio (SDR) were used to evaluate the effect of de-noising algorithm. Finally, the ECG signals were re-constructed. Based on the experimental comparison, it was concluded that the proposed algorithm had better filtering functions than the improved Levkov algorithm, because it could not only effectively filter the PLI, but also have smaller SDR value.
ObjectiveTo evaluate the effectiveness of hemiarthroplasty combined with greater trochanter reattachment device for intertrochanteric fractures in elderly patients. MethodsA retrospective analysis was made on the clinical data of 34 patients (35 hips) with intertrochanteric fractures underwent hemiarthroplasty combined with greater trochanter reattachment device between February 2010 and April 2013.Of 34 patients,16 were males (16 hips) and 18 were females (19 hips),and the mean age was 85.6 years (range,77-95 years).All fractures were caused by falling.The left hip was involved in 20 cases,the right hip in 13 cases,and the bilateral hips in 1 case.There were 33 cases (34 hips) of fresh fracture,and 1 case (1 hip) of old fracture.Fractures were rated as type Ⅲ in 6 cases (6 hips),type IV in 11 cases (11 hips),and type V in 17 cases (18 hips) according to Evans-Jensen standard.All of the patients had different degree of osteoporosis and internal diseases. ResultsAll patients underwent surgery successfully.The operation time was 70-90 minutes (mean,76.6 minutes);the intraoperative blood loss was 260-400 mL (mean,301.5 mL);the postoperative drainage was 80-530 mL (mean,290.6 mL);and the hospitalization time was 10-12 days (mean,11.7 days).Postoperative infection of incision occurred in 1 case,which was cured after dressing;primary healing of incision was obtained in the other patients.No lower extremity deep vein thrombosis or other complications was observed.Twenty-six cases (27 hips) were followed up 12-48 months (mean,21.3 months).X-ray examination showed fracture healing,and the healing time was 2.5-3.5 months (mean,2.8 months).There was no dislocation,prosthesis loosening,dislocation,loosening of titanium cable,periprosthetic osteolysis,or other complications during the follow-up period.According to Harris hip score,the results were excellent in 8 hips,good in 15 hips,fair in 4 hips,and the excellent and good rate was 85.2% at 1 year after operation. ConclusionThe hemiarthroplasty combined with greater trochanter reattachment device is a feasible and effective method to treat intertrochanteric fractures in the elderly patients.It can allow early ambulation and improve quality of life,but it is necessary to strictly control the indications,and perioperative management should be paid attention.
ObjectiveTo assess early and mid-term outcomes and our clinical experience of reduction ascending aortoplasty (RAA) for patients with aortic valve disease and ascending aortic dilatation, and improve treatment effects. MethodsClinical data of 36 patients with aortic valve disease and ascending aortic dilatation who underwent aortic valve replacement and RAA in Fu Wai Hospital between January 2002 and August 2010 were retrospectively analyzed. There were 26 male and 10 female patients with their age of 7-72 (51±16) years. Ascending aorta diameter (AAD) was measured by echocardiography preoperatively, postoperatively, during follow-up and compared. ResultsThere was no perioperative death. Cardiopulmonary bypass time was 96.2±28.3 minutes, and aortic cross-clamp time was 69.2±22.1 minutes. Posto-perative hospital stay was 11.0±7.8 days. All the 36 patients were followed up after discharge for 1.1-9.0 (4.0±2.3) years. During follow-up, there was 1 death, but none of the patients needed reoperation. Echocardiography showed normal aortic valve function. Postoperative AAD was significantly smaller than preoperative AAD (36.4±6.1 mm vs. 46.8±4.6 mm, t=13.12, P=0.00). AAD during follow-up was significantly larger than postoperative AAD (40.8±6.8 mm vs. 36.4±6.1 mm, t=-2.64, P=0.01) but significantly smaller than preoperative AAD (40.8±6.8 mm vs. 46.8±4.6 mm, t=3.48, P=0.00). ConclusionEarly and mid-term outcomes of RAA are satisfactory for patients with aortic valve disease and ascending aortic dilatation, but long-term results need further observation.