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Adaptive removal of power-line interference from high resolution ECG

Advances in Bioscience and Biotechnology 2012年第4期3卷 324-326页

作者： Ismail Sadiq Adil M. Zuberi Idrees Zaman ammad Hassan Tahir Zaidi Centre for Advanced Research in Engineering Pakistan

The paper presents a novel approach to adaptive removal of power-line interference, taken to be at 50 Hz, from high resolution ECG sampled at 1 KHz. ECG data consists of 12 lead data. Each of the 12 leads contains power line interference at the time of acquisition. So power line interference needs to be removed from each lead. An approach that uses the power spectral density over the range of interest is used to determine the exact frequency of the interfering component and filter coefficients for the desired notch filter are determined using an interpolation technique.

关键词： Notch Filter Power Spectrum Linear Interpolation Adaptive Noise Removal

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Normal vitamin D levels are associated with spontaneous hepatitis B surface antigen seroclearance

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World Journal of Hepatology 2013年第6期5卷 328-331页

作者： Mahmud Mahamid William Nseir Omar Abu Elhija Shimon Shteingart ammad Mahamid Mosab Smamra Benjamin Koslowsky Digestive Disease Institute Shaare Zedek Medical Center Liver Unit Shaare Zedek Medical Center Liver Unit Holy Family Hospital Infectious Disease Unit Holy Family Hospital

AIM: To investigate a possible association between serum vitamin D levels and spontaneous hepatitis B surface antigen (HBsAg) seroclearance. METHODS: Fifty-three patients diagnosed with chronic inactive hepatitis B and spontaneous HBsAg seroclearance were followed up in two Israeli liver units between 2007 and 2012. This retrospective study reviewed medical charts of all the patients, extracting demographic, serological and vitamin D rates in the serum, as well as medical conditions and current medical therapy. Spontaneous HBsAg seroclearance was defined as the loss of serum HBsAg indefinitely. Vitamin D levels were compared to all patients who underwent spontaneousHBsAg *** seroclearance. RESULTS: Out of the 53 patients who underwent hepatitis B antigen seroclearance, 44 patients (83%) had normal levels of 25-hydroxyvitamin vitamin D compared to 9 patients (17%) who had below normal levels. Multivariate analysis showed that age (>35 years) OR = 1.7 (95%CI: 1.25-2.8, P=0.05), serum vitamin D levels (>20 ng/mL) OR = 2.6 (95%CI: 2.4-3.2, P=0.02), hepatitis B e antigen negativity OR = 2.1 (95%CI: 2.2-3.1, P=0.02), low viral load (hepatitis B virus DNA 8 years) OR = 1.6 (95%CI: 1.15-2.6, P=0.04) were also associated with spontaneous HBsAg seroclearance. CONCLUSION: We found a strong correlation between normal vitamin D levels and spontaneous HBsAg seroclearance.

关键词： Hepatitis B Vitamin D Immune disease Seroclearance Viral load

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