Clinical evaluation of “quantitative” rheoencephalography

Masucci, Elmo F.; Seipel, John H.; Kurtzke, John F.

doi:10.1212/wnl.20.7.642

Cited by 4 publications

(3 citation statements)

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“…Nevertheless, experimental studies have shown that a large portion of REG I reflects scalp blood flow (Perez-Borja and Meyer 1964, Laitinen 1968, Masucci et al 1970. Some other authors have reached the same conclusion by means of theoretical studies (Hatsell 1991).…”

Section: Introductionmentioning

confidence: 81%

Influence of the scalp thickness on the intracranial contribution to rheoencephalography

Pérez¹,

Guijarro²,

Barcia³

2004

Phys. Med. Biol.

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In spite of the great efforts made by the scientific community, up to now there is no agreement about the rheoencephalography (REG) capability to reflect cerebral blood flow (CBF). Moreover, a standard procedure and the optimal electrode arrangement have not been established yet. In a previous study, we found, using a classical four-shell spherical model of the head and solving it by numerical methods that, theoretically, there could exist an electrode arrangement to register an REG II free of extracranial contribution. In this paper, we have studied the influence of scalp thickness on the intracranial contribution to REG II. The study has been performed by solving the head model, using in this case analytical methods, and then estimating the partial contribution of CBF pulsatility to REG for a given set of scalp thicknesses. Although our theoretical results validate the previous finding and suggest that, in some cases, an optimal electrode arrangement to register REG II exists, such an arrangement, and even its existence, is very sensitive to the subject's scalp thickness. According to this, there could not exist a universal electrode arrangement suitable for all individuals to register an REG II free of extracranial contribution, since it depends on the subject's physical constitution. This fact could explain the lack of agreement in the literature about REG interpretation.

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Section: Introductionmentioning

confidence: 81%

Influence of the scalp thickness on the intracranial contribution to rheoencephalography

Pérez¹,

Guijarro²,

Barcia³

2004

Phys. Med. Biol.

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“…Their statement that the imped ance values for the surface electrode-to-electrolyte interface exceeded the under lying tissue resistance of the brain has been challenged by Kinnen (1969a, b) and the model constructed by Seipel (1967) further refutes this. Finally it has been claimed that some examples of intracerebral pathology are not always revealed by rheoencephalography (Perez-Borja and Meyer, 1964;Waltz and Ray, 1967;Masucci et al, 1970) but there have been successful efforts to do so (McHenry, 1965;Seipel, 1967;Hadjiev, \912\Jacquy et al, 1974). Seipel (1967) found this to be the case for 95% of his 136 REG recordings, while Hadjiev (1972) has reviewed the world literature covering a large number of such investigations.…”

Section: Discussionmentioning

confidence: 99%

The Diagnostic Potential of Rheoencephalography in Psychiatry

Dixon¹,

Doust²

1978

Psychopathology

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A 3 electrode monopolar rheoencephalograph was employed to produce a 15 min record of electrical impedance plethysmographic pulse-volume waves in 139 healthy subjects and 782 patients belonging to 15 psychiatric syndromes. Parameters of amplitude, percent rise time and average inflow angle were hand-measured and their means obtained for 30 waveforms throughout each record. Results obtained depended significantly upon chronological age and in some cases on gender. Mental health was found clearly distinguishable from psychiatric disability, but psychiatric syndromes could not be differentiated from one another. A low percent rise time coupled with a high average inflow angle were typical of youth and mental health.

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“…To record intracranial volumetric ("plethysmographic") changes in normal human subjects, we applied a noninvasive electrical impedance measurement procedure known as rheoencephalography (REG). Although there have been some reports (28,32) that the REG signal is substantially contaminated by scalp blood flow, these have been contradicted by a large body of literature indicating a cortical (i.e., intracranial) origin of the REG signals [reviewed in ( 16)]. For example, Jacquy et al ( 19) found highly significant correlation of the REG method with an invasive radioisotope method in estimating regional cortical blood flow.…”

Section: Methodsmentioning

confidence: 99%

Rapid auditory evoked vascular response in man

O’Halloran

Sandman

Isenhart

1985

Experimental Neurology

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Plethysmographic signals were recorded in four body regions (fingertip, forearm, cerebral cortex, and ophthalmic artery) of normal, healthy subjects during the presentation of brief auditory tones. Tones were presented during either systolic or diastolic phases of the cardiac cycle. Using data processing techniques similar to those employed in cortical evoked potential studies, averaged waveforms were derived which revealed the presence of a polyphasic volumetric response beginning as early as 150 ms (after onset of tones) in some subjects. Grand average waveforms suggested a similar morphology in all four body regions. The rapid onset argued for neural mediation of this response which may represent a sudden, transient flexure of vascular smooth muscle. The presence of this evoked vascular response in the brain suggests a previously unreported responsiveness of the cerebral vasculature in man to simple auditory stimulation.

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Clinical evaluation of “quantitative” rheoencephalography

Cited by 4 publications

References 0 publications

Influence of the scalp thickness on the intracranial contribution to rheoencephalography

Influence of the scalp thickness on the intracranial contribution to rheoencephalography

The Diagnostic Potential of Rheoencephalography in Psychiatry

Rapid auditory evoked vascular response in man

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