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U Wave

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

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. Frequency-Modulated Wave Dielectrophoresis of Vesicles And Cells: Periodic U-Turns at the Crossover Frequency (PubMed)

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

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2018 Nanoscale research letters

3. Validation of an algorithm to reveal the U wave in atrial fibrillation (PubMed)

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

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2018 Scientific reports

4. Prevalence and Prognostic Significance of Negative U-waves in a 12-lead Electrocardiogram in the General Population. (PubMed)

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. U wave on ECG

U wave on ECG U wave on ECG – All About Cardiovascular System and Disorders Now Trending: | December 6, 2015 | | U wave on ECG U wave on ECG occurs after the T wave and is usually seen in the mid precordial leads. In hypokalemia, T wave becomes flattened and U wave becomes prominent (or apparently so because of near absence of T waves). Important conditions associated with U waves are systemic hypertension, aortic and mitral regurgitation and coronary artery disease [1]. Theories about genesis (...) of U waves One theory about the genesis of U wave is that it is due to repolarization of the Purkinje fibres. Another possibility is that it is due to after potentials caused by mechanical forces in the ventricular wall. A third hypothesis suggests that it is due to prolonged repolarization of the mid myocardial M cells [2]. Yet another hypothesis is the delayed repolarization of papillary muscles [3]. None of these theories have been widely accepted. Importance of negative U wave An inverted U

2015 Cardiophile MD blog

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

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

9. 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

10. 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

11. Central and peripheral pulse wave velocity and subclinical myocardial stress and damage in older adults. (PubMed)

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

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2019 PLoS ONE

12. 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

13. 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

14. 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

15. 2 Cases of Resolved Chest Pain with Dynamic Terminal T-wave Inversion

(Case 1), in V2 and V3, notice the large U-wave. --V2 on the left (Case 2) is somewhat of an anomaly, with a qR-wave suggesting incomplete RBBB; try to ignore it for the purposes of this discussion. These are all features of normal variant T-wave inversion. Case 1: This is classic for a benign pattern, especially in a young athlete. You might be surprised that benign patterns can be dynamic (change with time), but they can be!! Also telling is that when the patient had pain, he did not have a STEMI (...) 2 Cases of Resolved Chest Pain with Dynamic Terminal T-wave Inversion Dr. Smith's ECG Blog: 2 Cases of Resolved Chest Pain with Dynamic Terminal T-wave Inversion Sunday, July 23, 2017 Here are two different series of ECGs in 2 different patients with chest tightness/discomfort that resolved. Case 1 A 20-something with chest tightness that later resolved. Blood pressure was normal. ECG, with chest tightness: Later ECG, after resolution of chest discomfort Later, continued pain free What is your

2017 Dr Smith's ECG Blog

16. Are These Wellens' Waves??

, not Down-Up T-waves as here. Down-Up T-waves in V2 and V3 have only 3 causes, as below. Moreover, the QT interval is impossibly long at about 560 ms, with a corrected QT of 593 ms (Fridericia correction, which seems to be the best; QTc(Bazett) = 611 ms. When the QT is impossibly long, think that the "T-wave" is actually a U-wave, not a T-wave. Here the U-waves are highlighted: 1. In lead V6, one can discern discrete T-waves (red arrow) and U-waves (black arrow) . 2. Go down to rhythm strip lead II (...) across the bottom, identify T- and U-waves there. 3. Go 3 beats earlier in lead II to identify the U-wave there (green line) . 4. Draw the green line up to show the U-waves in leads V1-V3 So these are indeed U-waves, not T-waves 1) Posterior MI with some reperfusion (reciprocal to Up-Down T-waves of the posterior wall, analogous to Wellens' of the posterior wall as recorded from the anterior wall). See case below 2) Hypokalemia (in which case the upright component is really a U-wave). In this case

2017 Dr Smith's ECG Blog

17. Sudden weakness with bradycaria and bizarre T-waves

of mobitz II, you can have isorhythmic dissociation with an atrial rate of 96 and ventricular rate of 50 because the EFFECTIVE atrial rate that you are assessing is only 48. Anonymous I'm a bit late in asking this question; however, I keep looking at the first ECG and question if there is any chance this could be an accessory pathway and U waves? You indicated the electrolytes were normal, but is there any chance that there are U waves following the T wave and not P waves? Excellent case that gets (...) the brain going. that might be possible until you see what happens moments later. good observation! Why not it u waves rather than p? Hi Dr. Smith, I was just reviewing this for a presentation I am giving on AV blocks and I have a different take on ECG # 1 from this case. I find it hard to believe that the P waves that are right next to the QRS are conducting to the QRS directly next to it. To me this would then suggest some sort of pre-excitation. Rather, wouldn't it make more sense if that p wave

2017 Dr Smith's ECG Blog

18. A U-shaped Association Between Blood Pressure and Cognitive Impairment in Chinese Elderly. (PubMed)

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

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2017 Journal of the American Medical Directors Association

19. U-Shaped and Surface Functionalized Polymer Optical Fiber Probe for Glucose Detection (PubMed)

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

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2017 Sensors (Basel, Switzerland)

20. 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. (PubMed)

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

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