Results 211 to 220 of about 31,446 (257)
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Narrow QRS Complex Tachycardias
AACN Advanced Critical Care, 2007Narrow QRS complex tachycardias are either atrioventricular (AV) nodal passive or AV nodal active. AV nodal passive tachycardias do not require the participation of the AV node in maintenance of the tachycardia. Examples are atrial tachycardia, atrial flutter, and atrial fibrillation.
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AACN Advanced Critical Care, 1992
Electrocardiographic monitoring for dysrhythmias is a major responsibility of critical care nurses, and patients with wide QRS complex tachycardias present a challenge. Criteria for differentiating the impulse origin as ventricular or supraventricular are well documented: QRS duration, QRS morphology, QRS axis, and presence of atrioventricular ...
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Electrocardiographic monitoring for dysrhythmias is a major responsibility of critical care nurses, and patients with wide QRS complex tachycardias present a challenge. Criteria for differentiating the impulse origin as ventricular or supraventricular are well documented: QRS duration, QRS morphology, QRS axis, and presence of atrioventricular ...
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Estimation of QRS Complex Power Spectra for Design of a QRS Filter
IEEE Transactions on Biomedical Engineering, 1984We present power spectral analysis of ECG waveforms as well as isolated QRS complexes and episodes of noise and artifact. The power spectral analysis shows that the QRS complex could be separated from other interfering signals. A bandpass filter that maximizes the signal (QRS complex)-to-noise (T-waves, 60 Hz, EMG, etc.) ratio would be of use in many ...
N V, Thakor, J G, Webster, W J, Tompkins
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Hospital Practice, 1984
A 65-year-old man is seen in the emergency room for an episode of tachycardia that began 30 minutes ago. He had a myocardial infarction three years ago. Since then, he has had recurrent bouts of tachycardia diagnosed as ventricular tachycardia Treatment with quinidine, procainamide, disopyramide, and several beta-adrenergic blocking drugs was ...
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A 65-year-old man is seen in the emergency room for an episode of tachycardia that began 30 minutes ago. He had a myocardial infarction three years ago. Since then, he has had recurrent bouts of tachycardia diagnosed as ventricular tachycardia Treatment with quinidine, procainamide, disopyramide, and several beta-adrenergic blocking drugs was ...
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Parallel complexity of householder QR factorization
1996Gaussian Elimination with Partial Pivoting and Householder QR factorization are two very popular methods to solve linear systems. Implementations of these two methods are provided in state-of-the-art numerical libraries and packages, such as LAPACK and MATLAB. Gaussian Elimination with Partial Pivoting was already known to be P-complete.
Mauro Leoncini +2 more
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Influence of hemorrhage on the QRS complex of the electrocardiogram
American Heart Journal, 1971Abstract The removal of blood from anesthetized cats or dogs invariably produces an immediate reduction of the amplitude of the QRS complex, which can be restored to normal by reinjecting the blood. In the present study it was demonstrated that the QRS changes are directly related to the changes of the heart volume, viz., reduction of QRS amplitude ...
M, Manoach +4 more
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Complexity of parallel QR factorization
Journal of the ACM, 1986An optimal algorithm to perform the parallel QR decomposition of a dense matrix of size N is proposed. It is deduced that the complexity of such a decomposition is asymptotically 2 N , when an unlimited number of processors is available.
Michel Cosnard, Yves Robert
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The QRS complex of the electrocardiogram
American Heart Journal, 1943The electrocardiogram is a photographic record of the differences in electrical potential existing between two points on the body surface at every instant during the time the record is being taken. On the ordinates of the record one reads the potential differences; on the abscissas the time is given.
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Abnormalities of the QRS Complex
1990Abnormalities of the QRS axis and the QRS interval have been discussed in earlier chapters and will be noted in this chapter only as they relate to other problems. As a general rule, the QRS complex reflects primarily left ventricular activity and to a much lesser extent right ventricular activity, since the mass of the left ventricle is so much ...
John Wagner Beasley, E. Wayne Grogan
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Correction to "Modeling QRS complex in dECG"
IEEE Transactions on Biomedical Engineering, 2007For the above-named work the second author?s name was incorrect. The correct spelling is Ananthapadmanabha.
Chandrakar Kamath +1 more
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