COMBINED ANALYSIS OF CEREBRAL BLOOD FLOW
AND THE BRAIN ELECTRIC ACTIVITY
A UNIQUE FEATURE!
Joint impedance
plethysmography and electroencephalographic study efficiently reveals
correlations between different abnormalities in cerebral blood flow
and in brain electric activity.
Synchronous monitoring of EEG and REG data with a concise display
of index variations on a single time scale clearly demonstrates correlations
between different systems of the body.
The system software allows to analyze various combinations
of recorded indices in selected time intervals using advanced methods
of computer analysis and data representation.
Combined recording of EEG, REG, offset potentials, and other polygraphic
signals, which are concisely represented by trends of index
variability
on a single time scale, greatly expands the potential for diagnosis
in a wider scope of abnormalities and disorders.
This allows to:
Monitor the correctness of study process (e.g. by tracking the patient's response in hyperventilation tests);
Consider the role of vascular factor in epilepsy;
Reveal patients with improperly developed breathing patterns leading to cerebrovascular conditions;
Improve the quality of syncopal condition diagnosis;
Study the character of interactions between the body systems in various conditions;
Justify the selection of a particular therapeutic treatment and estimate its efficiency.
Combined assessment of EEG, REG, ECG, and other polygraphic
data is offered only by "Encephalan-131-03" Electroencephalograph-Analyzer
and "RHEAN-POLY" Rheograph-Polyanalyser systems produced by Medicom-MTD, Ltd.
Combined analysis of EEG and REG signals in the split-screen mode
zoom
Left screen:
initial background state; right screen: "Hyperventilation, 3rd
min" test.
Pronounced deterioration of EEG and REG signals with the appearance
of paroxysmal activity in EEG and reduced cerebral pulsatile blood
filling shown as decreased rheographic index (RI) is demonstrated.
Bar graphs
Bar
graphs in the initial background state (dark blue bars) and in "Hyper-ventilation,
3rd min" test (red bars).
The left axis represents variation of qualitative indices.
It is clearly demonstrated that the bar graphs virtually are not
overlapped for most of the indices.
Trends (beat-by-beat index variations)
Pronounced
deterioration of indices related to different body systems in response
to a provocation is demonstrated:
Rheographic Index began to drop significantly in 30-40 sec after starting
hyperventilation (HV) and only at the 3rd sec of HV appeared the significant
changes in EEG: a sharp rise in slow activity with paroxysmal events
and a drastic drop in alpha activity.
The variability graphs more clearly demonstrate significance of quantitative
EEG indices and also that the changes have been reflected in other
signals:
peripheral vascular tonus has elevated (shown as lower PPG amplitude),
heart rate has increased,
and build-up of ultra-slow activity occurred in the course of hyperventilation.
