New sampling theorem and multiplicative filtering in the FRFT domain

Abstract

Having in consideration a fractional convolution associated with the fractional Fourier transform (FRFT), we propose a novel reconstruction formula for bandlimited signals in the FRFT domain without using the classical Shannon theorem. This may be considered the main contribution of this work, and numerical experiments are implemented to demonstrate the effectiveness of the proposed sampling theorem. As a second goal, we also look for the designing of multiplicative filters. Indeed, we also convert the multiplicative filtering in FRFT domain to the time domain, which can be realized by fast Fourier transform. Two concrete examples are included where the use of the present results is illustrated.

http://bit.ly/2G7Y2eo

Ruminal Microbial Populations and Fermentation Characteristics in Beef Cattle Grazing Tropical Forage in Dry Season and Supplemented with Different Protein Levels

Abstract

We tested the hypothesis that supplementation with protein improves fermentation parameters without damaging the rumen microbial populations of beef cattle grazing Urochloa brizantha cv. Marandu during the dry season. Four rumen-cannulated Nellore bulls (571 ± 31 kg of body weight) were used in a 4 × 4 Latin square design. The treatments were not supplemented with concentrate (only free-choice mineral salt ad libitum) and supplemented (supplements with low-LPSU, medium-MPS, and high protein supplement—HPS), supplying 155, 515, and 875 g/animal/day of crude protein (CP), respectively. The abundance of each target taxon was calculated as a fraction of the total 16S rRNA gene copies in the samples, using taxon-specific and domain bacteria primers. There was no difference (P > 0.05) across treatments for intakes of dry matter (DM), forage and neutral detergent fiber (NDF), digestibility of DM and NDF, and ruminal pH. Animals supplemented with concentrate had greater (P < 0.05) intakes and digestibility of CP, ether extract and non-fibrous carbohydrate contents of the substrates (EE + NFC), and ruminal ammonia nitrogen (RAN) compared to control. Bulls that received only mineral salt had lower proportions of Butyrivibrio fibrisolvens and had greater (P < 0.05) proportions of Fibrobacter succinogenes, Ruminococcus albus, Ruminococcus flavefaciens, Methanogen archaea than bulls supplemented with concentrate. The MPS animals had greater (P < 0.05) intake and digestibility of CP, RAN concentration, and had lower (P < 0.05) proportions of Fibrobacter succinogenes, Ruminococcus flavefaciens, and Selenomonas ruminantium than LPSU animals. The HPS provided higher (P < 0.05) intake of CP, RAN and proportion of Ruminococcus albus when compared with MPS. In conclusion, supply of 515 g/animal/day of protein via supplement provides better ruminal conditions for the growth of cellulolytic bacteria of bulls on pasture during dry season.

http://bit.ly/2Sy5dlQ

SOFA Score Can Effectively Predict the Incidence of Sepsis and 30-Day Mortality in Liver Transplant Patients: A Retrospective Study

Abstract

Introduction

This study aims to evaluate the early predictive value for postoperative sepsis and 30-day mortality in liver transplant patients using sequential organ failure assessment (SOFA).

Methods

A total of 96 liver transplant patients were enrolled into this study from February 2015 to June 2018. The general information, biochemical findings, and postoperative 30-day mortality of these patients were statistically analyzed.

Results

The SOFA scores, C-reactive protein (CRP), and procalcitonin (PCT) at postoperative day (POD) 3, 5, and 7 were significantly higher in the sepsis group than in the non-sepsis group, and the differences were statistically significant. Receiver operating characteristic (ROC) curve showed that SOFA scores at POD 1, 3, 5, and 7 had higher sensitivity and specificity in predicting the incidence of sepsis within 30 days. The difference in 30-day survival rate between patients with SOFA scores of > 5 and patients with SOFA scores of ≤ 5 at POD 1–7 was statistically significant (P < 0.05).

Conclusion

SOFA scores at POD 1–7 can effectively predict the incidence of sepsis and 30-day mortality in liver transplant patients on the basis of CRP and PCT.

http://bit.ly/2BlgtIF

A cross-sectional population-based survey looking at the impact of cancer survivorship care plans on meeting the needs of cancer survivors in the posttreatment stage

Abstract

Purpose

The purpose of this study was to determine the impact of receiving a survivorship care plan (SCP) on meeting cancer survivors' overall, informational, physical, emotional, and practical needs. Since the recommendation for implementation of SCPs, there have been numerous studies on their effectiveness with mostly inconclusive results.

Methods

All Nova Scotia survivors meeting specific inclusion and exclusion criteria were identified from the Nova Scotia Cancer Registry and sent the 83-item survey to assess experiences and needs across five domains (overall, informational, physical, emotional, and practical). Descriptive statistics (frequencies, percentages) and chi-square analyses were used to examine and report survey findings.

Results

The response rate was 44.6%, with 1514 respondents. SCPs were significantly associated (p < 0.00001) with receiving timely help and support to meet survivors' overall, informational, physical, emotional, and practical needs posttreatment. For the most part, survivors' clinical characteristics, such as cancer type, time since treatment, chronic comorbidities, and metastases, did not result in differences among the five outcomes.

Conclusions

Those who received a SCP reported higher agreement on all five outcomes in comparison to those who did not receive a SCP. Further work should evaluate the delivery of SCPs and the components of SCPs that are most likely to contribute to positive survivor outcomes.

http://bit.ly/2WKu7hl

Extra-parenchymal splenic abnormalities not vascular injury predict need for primary splenectomy

Abstract

Purpose

Radiographic indications for primary splenectomy (PS) in blunt splenic injury (BSI) after radiographic diagnosis are unknown. Improved understanding of radiographic characteristics of patients requiring splenectomy will help to appropriately triage patients to PS or non-operative management (NOM).

Methods

A retrospective, single-center review was performed of BSI diagnosed with computerized tomography (CT). Patients undergoing splenectomy prior to CT diagnosis were excluded.

Results

BSI was identified in 195 patients. On logistic regression, only subcapsular hematoma presence (OR 7.521, p = 0.002) and left upper quadrant hemoperitoneum (OR 6.146, p = 0.03) were associated with need for PS, while splenic laceration length, number of pseudoaneurysms (PSA), and active contrast extravasation (NS for all) were not.

Conclusions

Need for PS is predicted by extra-parenchymal pathology in subcapsular hematoma and hemoperitoneum. Splenic vascular injuries through PSA and active contrast extravasation do not predict the need for PS and can be considered for NOM.

http://bit.ly/2Gr3mc3

Sleep apnea and galectin-3: possible sex-specific relationship

Abstract

Purpose

Sleep apnea is associated with increased risk of cardiovascular disease. Elevated plasma galectin-3 levels, a biomarker associated with myocardial fibrosis, are also associated with adverse cardiovascular events, including heart failure. Our objective was to determine the relationship between severity of sleep apnea and plasma levels of galectin-3 and to determine whether this relationship was modified by sex.

Methods

We performed a cross-sectional study of 471 Mexican Americans from Starr County, TX who underwent an overnight, in-home sleep evaluation, and plasma measurement of galectin-3. Severity of sleep apnea was based on apnea hypopnea index (AHI). Multivariable linear regression modeling was used to determine the association between categories of sleep apnea and galectin-3. We also tested for interactions by sex.

Results

The mean age was 53 years, and 74% of the cohort was female. The prevalence of moderate to severe sleep apnea (AHI > 15 apnea–hypopnea events per hour) was 36.7%. Moderate to severe sleep apnea was associated with increased levels of galectin-3 in the entire population, but we identified a statistically significant interaction between galectin-3 levels and category of sleep apnea by sex (p for interaction = 0.02). Plasma galectin levels were significantly higher in women with moderate or severe sleep apnea than women with no/mild sleep apnea (multivariable adjusted p < 0.001), but not in men (p = 0.5).

Conclusions

Sleep apnea is associated elevated galectin-3 levels in women but not men. Our findings highlight a possible sex-specific relationship between sleep apnea and galectin-3, a biomarker of potential myocardial fibrosis that has been associated with increased cardiovascular risk.

http://bit.ly/2UICUid

Reliability of peak foot pressure in patients with previous diabetic foot ulceration

Publication date: Available online 4 February 2019

Source: Gait & Posture

Author(s): Pei-Yueng Lee, Pui-Wah Kong, Yong-Hao Pua

Abstract

Background

Previous reliability studies on peak plantar pressure measurements in patients with previous diabetic foot ulceration (DFU) did not stratify their analyses according to whether the foot had a previous ulcer.

Research question

Does test-retest reliability of peak foot pressure measurements from the various foot regions differ between the ulcerated and non-ulcerated feet?

Methods

Data from 23 participants with peripheral neuropathy and healed plantar DFU were analysed in this test-retest reliability comparison study. Plantar pressure was evaluated on two sessions using Pedar^®-X in-shoe system, with a mean of 7.2 days (SD = 1.6) between sessions.

Results

The intraclass correlation coefficient (ICC) and coefficient of variation (CV) were calculated for 10 foot regions. Overall, test-retest reliability was excellent (ICCs, 0.82 to 0.95) for all peak pressure variables. CV ranged between 6.3% and 18.3%, and exceeded 15% over the hallux and medial forefoot regions in the ulcer foot (18.3% and 16.4%, respectively). Hallux peak pressure CV was significantly higher over the ulcer foot than over the non-ulcer foot (5.7%, 95% CI, 1.7% to 10.2%). Peak pressure CV over the forefoot also tended to be higher over the ulcer foot (medial forefoot: 6.1%, 95% CI, -0.5% to 14.5%; lateral forefoot: 4.1%, 95%CI, -0.7% to 11.1%).

Significance

Peak plantar foot pressure may be useful to distinguish between groups of patients with peripheral neuropathy and healed plantar DFU. However, clinical decisions based on ulcer foot hallux and forefoot peak pressure measurements should be interpreted with caution.

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