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H Bunko

Publications and source records attributed to H Bunko.

At least 91 records · Page 5Linked to original sources
PubMed1984

Quantification of segmental wall motion by length-based Fourier analysis.

A new method for evaluating segmental wall motion by length-based Fourier analysis is described. Fourier analysis is performed on a series of lengths from a center to edges of the ventricle, generating parameters of percent length shortening (%LS) and phase of the segment (length-based phase). The reproducibility of the result was good, since the algorithm was automatic except for the setting of the ventricular region as a mask image to exclude surrounding blood pools. This program can be applied for quantification of ventricular wall-motion abnormalities in gated blood-pool studies, and for analysis of the timing of ventricular contraction in gated blood-pool emission computed tomography to detect the site of an accessory conduction pathway in patients with Wolff-Parkinson-White syndrome.

Arrhythmias, Cardiac↗
PubMed1984

Phase analysis in the Wolff-Parkinson-White syndrome with surgically proven accessory conduction pathways: concise communication.

Twenty-one patients with the Wolff-Parkinson-White (WPW) syndrome who underwent surgical division of the accessory conduction pathway (ACP) were studied by gated blood-pool scintigraphy. In each case, a functional image of the phase was generated, based on the fundamental frequency of the Fourier transform. The location of the ACP was confirmed by electrophysiologic study, epicardial mapping, and surgery. Phase analysis identified the side of preexcitation correctly in 16 out of 20 patients with WPW syndrome with a delta wave. All patients with right-cardiac type (N = 9) had initial contraction in the right ventricle (RV). In patients with left-cardiac type (N = 10), six had initial movement in the left ventricle (LV); but in the other four the ACPs in the anterior or lateral wall of the left ventricle (LV) could not be detected. In patients with multiple ACPs (N = 2), one right-cardiac type had initial contraction in the RV, while in the other (with an intermittent WPW syndrome) the ACP was not detected. These observations indicate that abnormal wall motion is associated with the conduction anomalies of the WPW syndrome. We conclude that phase analysis can correctly identify the side of initial contraction in the WPW syndrome before and after surgery. However, as a method of pre-operative study, it seems difficult to determine the precise site of the ACP by phase analysis alone.

Adolescent↗