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U Wave

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1. Toluene toxicity presenting with hypokalemia, profound weakness and U waves in the electrocardiogram. (Abstract)

Toluene toxicity presenting with hypokalemia, profound weakness and U waves in the electrocardiogram. We present the case of a 25-year-old man with progressive limb weakness. His electrocardiogram showed prominent U waves which made us consider hypokalemia. The final diagnosis was toluene intoxication with severe hypokalemia and metabolic acidosis. Intravenous potassium administration and hydration effectively corrected the electrolyte and acid-base alterations; weakness resolved

2019 American Journal of Emergency Medicine

2. Validation of an algorithm to reveal the U wave in atrial fibrillation Full Text available with Trip Pro

Validation of an algorithm to reveal the U wave in atrial fibrillation Major cardiac organisations recommend U wave abnormalities should be reported during ECG interpretation. However, U waves cannot be measured in patients with atrial fibrillation (AF) due to the obscuring fibrillatory wave. The aim was to validate a U wave measurement algorithm for AF patients. Multi-beat averaging was applied to ECGs of 25 patients during paroxysms of AF and the presence of U waves compared to those from (...) the same patients during sinus rhythm (SR). In a further database of 10 long-term AF recordings, the number of beats for effective U wave extraction by the algorithm was calculated. U waves were revealed in all AF recordings and there was no significant difference between the presence of U waves in AF and SR (p = 0.88). U wave amplitude was significantly increased in AF (mean (s.d.) amplitude 55 (39) AF vs 37 (28) μV SR, p = 0.005). The presence of U waves could easily be discerned when as few as 10

2018 Scientific reports

3. Frequency-Modulated Wave Dielectrophoresis of Vesicles And Cells: Periodic U-Turns at the Crossover Frequency Full Text available with Trip Pro

Frequency-Modulated Wave Dielectrophoresis of Vesicles And Cells: Periodic U-Turns at the Crossover Frequency We have formulated the dielectrophoretic force exerted on micro/nanoparticles upon the application of frequency-modulated (FM) electric fields. By adjusting the frequency range of an FM wave to cover the crossover frequency f X in the real part of the Clausius-Mossotti factor, our theory predicts the reversal of the dielectrophoretic force each time the instantaneous frequency (...) periodically traverses f X . In fact, we observed periodic U-turns of vesicles, leukemia cells, and red blood cells that undergo FM wave dielectrophoresis (FM-DEP). It is also suggested by our theory that the video tracking of the U-turns due to FM-DEP is available for the agile and accurate measurement of f X . The FM-DEP method requires a short duration, less than 30 s, while applying the FM wave to observe several U-turns, and the agility in measuring f X is of much use for not only salty cell

2018 Nanoscale research letters

4. Prevalence and Prognostic Significance of Negative U-waves in a 12-lead Electrocardiogram in the General Population. Full Text available with Trip Pro

Prevalence and Prognostic Significance of Negative U-waves in a 12-lead Electrocardiogram in the General Population. Negative U-waves are a relatively rare finding in an electrocardiogram (ECG), but are often associated with cardiac disease. The prognostic significance of negative U-waves in the general population is unknown. We evaluated 12-lead ECGs of 6,518 adults (45% male, mean age 50.9 ± 13.8 years) for the presence of U-waves, and followed the subjects for 24.5 ± 10.3 years. Primary end (...) points were all-cause mortality, cardiac mortality, and sudden cardiac death; secondary end point was hospitalization due to cardiac causes. Negative U-waves (amplitude ≥0.05 mV) were present in 231 subjects (3.5%), minor negative (amplitude <0.05 mV) or discordant U-waves in 1,004 subjects (15.4%), normal positive U-waves in 3,950 (60.6%) subjects, and no U-waves were observed in 603 subjects (9.3%). In 730 subjects (11.2%), U-waves were unassessable. When adjusted for age and gender, negative U

2018 American Journal of Cardiology

5. U Wave

U Wave U Wave Toggle navigation Brain Head & Neck Chest Endocrine Abdomen Musculoskeletal Skin Infectious Disease Hematology & Oncology Cohorts Diagnostics Emergency Findings Procedures Prevention & Management Pharmacy Resuscitation Trauma Emergency Procedures Ultrasound Cardiovascular Emergencies Lung Emergencies Infectious Disease Pediatrics Neurologic Emergencies Skin Exposure Miscellaneous Abuse Cancer Administration 4 U Wave U Wave Aka: U Wave From Related Chapters II. Normal findings U (...) Wave best seen in lead V3 U Wave with same polarity as III. Causes: Prominent U Wave IV. Causes: Inverted U Wave Myocardial strain pattern V. Causes: Increased U Wave amplitude ( ) Images: Related links to external sites (from Bing) These images are a random sampling from a Bing search on the term "U Wave." Click on the image (or right click) to open the source website in a new browser window. Related Studies (from Trip Database) Ontology: Electrocardiogram U wave present (C0232333) Definition (NCI

2018 FP Notebook

6. The West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study: a cluster randomised controlled trial testing the clinical effectiveness and cost-effectiveness of a multifaceted obesity prevention intervention programme targeted at

targeted at children aged 6-7 years The West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study: a cluster randomised controlled trial testing the clinical effectiveness and cost-effectiveness of a multifaceted obesity prevention intervention programme targeted at children aged 6-7 years Adab P, Barrett T, Bhopal R, Cade J E, Canaway A, Cheng K K, Clarke J, Daley A, Deeks J, Duda J, Ekelund U, Frew E, Gill P, Griffin T, Hemming K, Hurley K, Lancashire E R, Martin J, McGee E (...) The West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study: a cluster randomised controlled trial testing the clinical effectiveness and cost-effectiveness of a multifaceted obesity prevention intervention programme targeted at The West Midlands ActiVe lifestyle and healthy Eating in School children (WAVES) study: a cluster randomised controlled trial testing the clinical effectiveness and cost-effectiveness of a multifaceted obesity prevention intervention programme

2018 Health Technology Assessment (HTA) Database.

7. Usefulness of Reversed U-Curve Technique to Enhance Mapping and Ablation Efficiency in the Treatment of Pulmonary Sinus Cusp-Derived Ventricular Arrhythmias. (Abstract)

catheter ablation using a contact force (CF)-sensing catheter. Reversed U-curve and conventional method were routinely used for each patient. For the 37 patients with PSC-VA (14 cases in left cusp [LC], 12 in right cusp, and 11 in anterior cusp), only 7 patients from the LC were ablated using conventional method whereas the others underwent successful reversed U-curve ablation. For the reversed U-curve mapping, presence of a near-field sharp potential and QS wave at the best mapping site were observed (...) Usefulness of Reversed U-Curve Technique to Enhance Mapping and Ablation Efficiency in the Treatment of Pulmonary Sinus Cusp-Derived Ventricular Arrhythmias. Reversed U-curve and nonreversed U-curve (conventional technique) were both reported to be effective in treating pulmonary sinus cusp (PSC)-derived ventricular arrhythmia (VA). The aim of this study was to evaluate the characteristics between two methods. We enrolled 37 consecutive patients with PSC-derived VA who underwent radiofrequency

2018 American Journal of Cardiology

8. Central and peripheral pulse wave velocity and subclinical myocardial stress and damage in older adults. Full Text available with Trip Pro

Central and peripheral pulse wave velocity and subclinical myocardial stress and damage in older adults. Arterial stiffness independently predicts cardiovascular disease. However, few studies have evaluated the associations of central and peripheral pulse wave velocity (PWV) with biomarkers of both myocardial stress (natriuretic peptide [NT-proBNP]) and damage (high-sensitivity cardiac troponin-T [hs-cTnT]) among persons without cardiac disease.We examined 3,348 participants (67-90 years (...) ) without prevalent cardiac disease in the Atherosclerosis Risk in Communities (ARIC) Study (2011-13). The cross-sectional associations of PWV quartiles for central arterial segments (carotid-femoral, heart-carotid, heart-femoral) and peripheral artery (femoral-ankle) with NT-proBNP and hs-cTnT were evaluated accounting for potential confounders.Most PWV measures demonstrated J- or U-shaped associations with the two cardiac biomarkers. The highest (Q4) vs. second lowest (Q2) quartile of central PWV

2019 PLoS ONE

9. A U-shaped Association Between Blood Pressure and Cognitive Impairment in Chinese Elderly. Full Text available with Trip Pro

A U-shaped Association Between Blood Pressure and Cognitive Impairment in Chinese Elderly. Higher or lower blood pressure may relate to cognitive impairment, whereas the relationship between blood pressure and cognitive impairment among the elderly is not well-studied. The study objective was to determine whether blood pressure is associated with cognitive impairment in the elderly, and, if so, to accurately describe the association.Cross-sectional data from the sixth wave of the Chinese (...) on the results of generalized additive models (GAMs), U-shaped associations were identified between cognitive impairment and SBP, DBP, PP, and MAP. The cutpoints at which risk for cognitive impairment (MMSE <24) was minimized were determined by quadratic models as 141 mm Hg, 85 mm Hg, 62 mm Hg, and 103 mm Hg, respectively. In the logistic models, U-shaped associations remained for SBP, DBP, and MAP but not PP. Below the identified cutpoints, each 1-mm Hg decrease in blood pressure corresponded to 0.7%, 1.1

2017 Journal of the American Medical Directors Association

10. U-Shaped and Surface Functionalized Polymer Optical Fiber Probe for Glucose Detection Full Text available with Trip Pro

U-Shaped and Surface Functionalized Polymer Optical Fiber Probe for Glucose Detection In this work we show an optical fiber evanescent wave absorption probe for glucose detection in different physiological media. High selectivity is achieved by functionalizing the surface of an only-core poly(methyl methacrylate) (PMMA) polymer optical fiber with phenilboronic groups, and enhanced sensitivity by using a U-shaped geometry. Employing a supercontinuum light source and a high-resolution

2017 Sensors (Basel, Switzerland)

11. Prospective Assessment of Ultrasound Shear Wave Elastography for Discriminating Biliary Atresia from other Causes of Neonatal Cholestasis. (Abstract)

. Both 2-dimensional (2D) and point ultrasound SWE were performed prior to knowing the final diagnosis. Median 2D (8) and point (10) shear wave speed measurements were calculated for each subject and used for analyses. The Mann-Whitney U test was used to compare shear wave speed and laboratory measurements between patients with and without biliary atresia. Receiver operating characteristic curve analyses and multivariable logistic regression were used to evaluate diagnostic performance.Thirteen (...) Prospective Assessment of Ultrasound Shear Wave Elastography for Discriminating Biliary Atresia from other Causes of Neonatal Cholestasis. To prospectively assess the diagnostic performance of ultrasound shear wave elastography (SWE) and hepatobiliary laboratory biomarkers for discriminating biliary atresia from other causes of neonatal cholestasis.Forty-one patients <3 months of age with neonatal cholestasis (direct bilirubin >2 mg/dL) and possible biliary atresia were prospectively enrolled

2019 Journal of Pediatrics

12. Assessment of the ECG T-Wave in Patients With Subarachnoid Hemorrhage. (Abstract)

Assessment of the ECG T-Wave in Patients With Subarachnoid Hemorrhage. Prolongation of the interval from the peak to the end of the T wave (Tp-Te) on a 12-lead electrocardiogram (ECG) is associated with ventricular arrhythmias. The aim of this study was to clarify associations between Tp-Te, Tp-Te/QT, and Tp-Te/rate-corrected QT (QTc) with clinical severity of subarachnoid hemorrhage (SAH) and clinical outcomes.This retrospective study included 222 patients with acute SAH (group S) and 306 (...) patients with unruptured cerebral aneurysms (group U). Tp-Te, Tp-Te/QT, and Tp-Te/QTc were manually measured in standard 12-lead ECG recordings on admission and comparisons made between patients in groups S and U. The relationships of these ECG parameters with Hunt and Hess grade and Glasgow outcome scale were analyzed using multiple logistic regression analysis after adjustment for confounding factors.Tp-Te, Tp-Te/QT, and Tp-Te/QTc were significantly greater in group S than in group U (group S: 109±30

2019 Journal of neurosurgical anesthesiology

13. Optimal non-invasive treatment of 1-2.5 cm radiolucent renal stones: oral dissolution therapy, shock wave lithotripsy or combined treatment-a randomized controlled trial. (Abstract)

Optimal non-invasive treatment of 1-2.5 cm radiolucent renal stones: oral dissolution therapy, shock wave lithotripsy or combined treatment-a randomized controlled trial. To evaluate the efficacy of oral dissolution therapy (ODT), shock wave lithotripsy (SWL), and combined SWL and ODT for medium-sized radiolucent renal stone (RLS).A randomized controlled trial for patients with medium-sized RLS, 1-2.5 cm, ≤ 500 Hounsfield unit (HU). The ODT patients were counseled for oral potassiumsodium (...) -hydrogen citrate (Uralyt-U®). The 2nd group underwent SWL and the last group had combined SWL and ODT. The primary outcome, stone-free rate (SFR) at 3 months, was assessed by non-contrast computed tomography (NCCT). We defined complete response (success) if no residual fragment were detected by NCCT; partial response (failure) if there was a decrease in stone size, but presence of residual stones; no response if there was no change or increase in stone size (failure).150 patients completed follow-up

2019 World journal of urology Controlled trial quality: uncertain

14. A 60 year old patient with large T-wave inversions

can mimic many pathologies, especially acute MI Primary prolonged QT interval - with STD, T-wave inversion, and U-waves; however the TWI in this case are far too large to be caused by primary prolonged QT interval This case, however, has one feature that seems to be fairly specific for one etiology: The inverted T-waves are too big, too broad, too bizarre to be reperfusion T-waves or pulmonary embolism pattern alone. These T-waves are diagnostic of Takotsubo cardiomyopathy. After seeing hundreds (...) A 60 year old patient with large T-wave inversions Dr. Smith's ECG Blog: A 60 year old patient with large T-wave inversions Monday, October 1, 2018 Written by Andrus Alian and Pendell Meyers, with edits by Steve Smith A female in her 60s with history of stage IV lung cancer presented to the ED with 3/10 chest pain and dyspnea waxing and waning for the last 24 hours. She had no personal or family history of coronary artery disease, drug use, HTN, or dyslipidemia. She did have a history

2018 Dr Smith's ECG Blog

15. ST Depression and T-wave Inversions after ROSC from Resp and Cardiac Arrest after Head Trauma

. You should read the ECG systematically! Look for: Rhythm, rate P waves PR interval QRS Duration (IVCD? RBBB? LBBB? Paced?) QRS Axis Voltage Abnormal Q waves R-wave progression J-waves S-waves Only then do you look at: ST segments T wave axis (inversion?) Size of T-waves, whether upright or inverted QT interval U-waves. Only THEN should you look at the ST-T. But let's be realistic!! Realistically, our eyes are drawn to the ST-T. We can't help ourselves. Therefore, we have to be aware that the ST-T (...) ST Depression and T-wave Inversions after ROSC from Resp and Cardiac Arrest after Head Trauma Dr. Smith's ECG Blog: ST Depression and T-wave Inversions after ROSC from Resp and Cardiac Arrest after Head Trauma Thursday, May 24, 2018 This patient had a head injury and was unconscious. He was found without respirations or pulse. Prehospital CPR resulted in ROSC. He remained comatose. Here is his initial ED ECG: What do you think? There is sinus rhythm at a rate of about 75. There is ST depression

2018 Dr Smith's ECG Blog

16. Look at these "T"-waves

Look at these "T"-waves Dr. Smith's ECG Blog: Look at these "T"-waves Friday, May 4, 2018 An alcoholic presented with confusion. He had this ECG recorded: What do you think? Computer measures the QT at 505 ms, and QTc at 533 ms The measure appears to be correct. V3 reminds me of this ECG: What is going on? These waves which you think are T-wave are really very large U-waves . The clues are: 1) the down-up morphology 2) the apparent very long QT The K returned at 2.1 ng/mL. The pH was 7.55 (...) ), then the pH would rise to 7.70 (very dangerous). Here are subsequent ECGs: This one at K = 2.4 The down up morphology remains The computer measures the QT at 565 ms, QTc at 591 ms This measurment also appears to be correct (except that now we know it is measuring the QU-interval, not the QT) Large U-waves, with long QU-interval, also puts patients at high risk of polymorphic VT And 6 hours later at K = 2.6 mEq/L: Now the apparent T-waves are really T-waves (not U-waves), and the QT is 479, QTc 500

2018 Dr Smith's ECG Blog

17. Besides the Nonspecific T-wave Inversion in aVL, What Else is Abnormal on this ECG?

with the same ECG finding (2nd case below). What is the finding? What does it signify? Case An elderly male presented with chest pain. Here is the first ED ECG: Hint: the finding is NOT the T-wave inversion in aVL This ECG that I published 10 years ago in Critical Decisions in Emergency and Acute Care Electrocardiography has the same finding: What is the finding? The finding is an inverted U-wave, as demonstrated with arrows here: Inverted U-waves in a patient with chest pain are reported to be highly (...) specific, but insensitive, for ischemia/infarction. Here is the ECG from Laszlo's case again: See the inverted U-waves in V3, V4, V5 In Laszlo's case, he recognized it and recorded another ECG 35 minutes later: Now the U-waves are not the issue. There is obvious STEMI. This is after reperfusion and stenting of an occluded LAD: Terminal T-wave inversion, consistent with reperfusion. And then 13 minutes later: Resolution of much of the ST Elevation (but not all). Now U-waves are upright in V2-V5 50-70

2018 Dr Smith's ECG Blog

18. T-wave inversions and dynamic ST elevation

and depressed PR interval in 38%, slightly asymmetrical T waves in 96.7%, and U waves in 50%. Sixty patients exercised normalized ST segment and shortened QT interval (83%). In another 60 patients, serial studies for 10 years showed disappearance of ER in 18%, and was seen intermittently in the rest of the patients. The authors conclude that in these patients with ER: 1) male preponderance was found; 2) incidence in Caucasians was as common as in blacks; 3) patients often were younger than 50 years; 4 (...) T-wave inversions and dynamic ST elevation Dr. Smith's ECG Blog: T-wave inversions and dynamic ST elevation Wednesday, April 18, 2018 Written by Pendell Meyers, with edits by Steve Smith I received a text message with no clinical information other than the following ECG, with the question "Is this Wellens? No prior ECG available." What do you think? I responded that this ECG represented benign T-wave inversion (BTWI), not Wellens. I asked for more history. It turns out this was a 25 year old

2018 Dr Smith's ECG Blog

19. Dose-Dependent Effects of Closed-Loop tACS Delivered During Slow-Wave Oscillations on Memory Consolidation. Full Text available with Trip Pro

Dose-Dependent Effects of Closed-Loop tACS Delivered During Slow-Wave Oscillations on Memory Consolidation. Sleep is critically important to consolidate information learned throughout the day. Slow-wave sleep (SWS) serves to consolidate declarative memories, a process previously modulated with open-loop non-invasive electrical stimulation, though not always effectively. These failures to replicate could be explained by the fact that stimulation has only been performed in open-loop, as opposed (...) to closed-loop where phase and frequency of the endogenous slow-wave oscillations (SWOs) are matched for optimal timing. The current study investigated the effects of closed-loop transcranial Alternating Current Stimulation (tACS) targeting SWOs during sleep on memory consolidation. 21 participants took part in a three-night, counterbalanced, randomized, single-blind, within-subjects study, investigating performance changes (correct rate and F1 score) on images in a target detection task over 24 h

2018 Frontiers in neuroscience Controlled trial quality: uncertain

20. Osborn wave in hypothermia and relation to mortality. (Abstract)

Osborn wave in hypothermia and relation to mortality. The aim of this study was to compare hypothermia patients with and without an Osborn wave (OW) in terms of physical examination findings, laboratory results, and clinical survival.The study was carried out retrospectively on hypothermic patients. The hypothermic patients were divided into two groups. Group 1 comprised patients with OW on electrocardiogram (ECG), and Group 2 comprised patients without OW on ECG. The Mann-Whitney U test

2018 American Journal of Emergency Medicine

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