Implantable defibrillators either monitor heart rate or use a probability density function to detect @entity2224 / @entity591 . As a result, they are unable to discriminate @entity7129 and @entity943 from malignant ventricular rhythms. We have assessed high fidelity fiber-optic pressure recordings in the right atrium during @entity943 in 23 @entity1 (mean age 44 years, 11 females) undergoing electrophysiological study. The unfiltered pressure signal was amplified and recorded on paper. During sinus rhythm, a constant amplitude deflection occurred during atrial systole (a wave). A characteristic waveform pattern was observed during each of the studied @entity591 , which included @entity955 , @entity2917 , @entity2917 , and @entity1165 with and without @entity713 . The waveform pattern allowed clear visual discrimination of the underlying @entity943 . Mean atrial pressure was increased during all @entity943 and did not allow discrimination of the nature of the @entity591 . High fidelity pressure recordings produced characteristic appearances for pattern recognition of each @entity943 studied. They allowed determination of the temporal relation between electrical and mechanical @entity299 and may have potential in the detection and recognition of @entity943 .

XXXX recognition and diagnosis from changes in right atrial pressure waveform--a feasibility study.

@entity1 :: ('9606', 'Species') :: ['patients'] @entity2917 :: ('MESH:D013611', 'Disease') :: ['atrioventricular reentrant tachycardia', 'atrioventricular nodal reentrant tachycardia'] @entity1165 :: ('MESH:D017180', 'Disease') :: ['ventricular tachycardia'] @entity713 :: ('MESH:D054537', 'Disease') :: ['ventriculoatrial conduction'] @entity591 :: ('MESH:D013610', 'Disease') :: ['tachycardia', 'tachyarrhythmias'] @entity2224 :: ('MESH:D014693', 'Disease') :: ['ventricular fibrillation'] @entity955 :: ('MESH:D001281', 'Disease') :: ['atrial flutter and fibrillation'] @entity299 :: ('MESH:D006331', 'Disease') :: ['cardiac events'] @entity943 :: ('MESH:D001145', 'Disease') :: ['atrial arrhythmias', 'cardiac arrhythmias', 'arrhythmias', 'arrhythmia'] @entity7129 :: ('MESH:D013616', 'Disease') :: ['sinus tachycardia']
@entity591 :: (MESH:D013610,Disease) :: ['Tachycardia']
