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Description
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 EXTENDED LOWER STIMULUS
RANGE--ULTRABRIEF STIMULATION |
| Pulsewidth and
frequency settings down to Ultrabrief and 20 Hz
allow you to deliver stimuli up to 8 seconds long
across the entire dosage range, to optimize
treatment in accordance with research showing
greater efficacy of short-pulsewidth,
low-frequency, extended-duration stimuli (Isenberg
et al, 1996; Chanpattana, 2001). |
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| POSTICTAL SUPPRESSION
INDEX |
| The Postictal
Suppression Index reports the degree of EEG
flattening immediately following the seizure,
which has been reported to correlate with clinical
efficacy (Nobler et al, 1993; Krystal &
Weiner, 1994; Krystal et al, 1995; Krystal, 1998;
Suppes et al, 1996; Petrides et al, 2000; Perera
et al, 2002). |
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| STATE-OF-THE-ART
MONITOR/PRINTER |
| Allows you to
monitor EEG1, EEG2, EKG, and EMG (or, choose 4
channels of EEG), plus 2 derived channels: digital
heart rate and anesthesia depth index, while
providing hard-copy documentation for the
patient's chart. |
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| IMPROVED FRONT-PANEL FLEXDIAL©
SELECTOR |
| Lets you select
all the traditional Thymatron® functions plus
important new ones, including Ultrabrief pulse
stimulation and programs that automatically set
the most effective combination of stimulus
parameters at any stimulus dose you have
selected. |
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| EXPANDED, COMPREHENSIVE
END-OF-TREATMENT REPORT |
| Now includes, in
addition to the familiar Thymatron® DGx measures,
your choice of the following measures unique to
the Thymatron® System IV: |
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| EEG COHERENCE
MEASURES of maximum sustained coherence and time
to peak coherence, interhemispheric
cross-correlation measures reported to reflect
seizure quality and clinical impact (Roemer et al,
1990-91; Krystal & Weiner, 1994; Krystal et
al, 1995; Krystal, 1998; Perera et al,
2002). |
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| EEG AMPLITUDE
MEASURES of maximum sustained EEG power, and time
to peak power, with separate values for early,
mid- and postictal seizure phases, found by the
Columbia and Duke University groups to be
important correlates of seizure quality and
efficacy (Nobler et al, 1993, 2000; Krystal &
Weiner, 1994; Krystal et al, 1995; Suppes et al,
1996; Krystal, 1999; Perera et al,
2002). |
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| HEART RATE
MEASURES, including peak heart rate, a key measure
of cerebral seizure duration and quality (Larson,
Swartz, & Abrams, 1984; Swartz, 1993; 1996)
that reflects the autonomic (brainstem) response
to ECT. This is supplemented by continuous
digital heart rate monitoring for safety and
seizure generalization, with the result printed
each second on the recording strip. |
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| A POWERFUL 32-BIT INTERNAL
COMPUTER |
| Employs Power
Spectral Analysis (FFT) to process and store up to
10 minutes of digitized EEG for the special
features described here. You can send this data
to any WINDOWS computer via a rear-panel serial
port for further comprehensive EEG
analysis. |
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| DIGITAL EEG MACHINE
FUNCTIONS |
The Thymatron®
System IV has all the functions of a sophisticated
4-CHANNEL DIGITAL EEG MACHINE with frequency,
coherence, asymmetry, and power spectral analytic
programs. These allow you to record and analyze
EEGs in your ECT patients between treatments to
measure ECT-induced frontal EEG slowing and other
EEG manifestations reported to reflect treatment
impact and efficacy (Fink & Kahn, 1957; Roemer
et al, 1990-91; Sackeim et al, 1996).
Because each ECT treatment session is STORED IN
MEMORY, you can retrieve it if you run out of
paper during a treatment -- just slip in another
pack after the treatment and press a button for a
complete printout. |
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| PATENTED INDEPENDENT SAFETY MONITOR
CIRCUIT AND ALARM |
| Prevents the
patient from receiving an excessive electrical
dose regardless of the operation of the regular
circuits. |
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| TRUE EMG RECORDING OF THE MOTOR
SEIZURE |
| Unlike simple
movement detectors, the Thymatron® System IV's EMG
can measure seizure muscle activity that is not
visible to the naked eye, and which typically
continues substantially longer than visible
movements (Couture et al, 1988). |
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| JUST SET ACCORDING TO AGE AND
TREAT |
| Setting the
Thymatron® System IV according to the patient's
age facilitates easy selection of a stimulus
charge for unilateral, bitemporal, or bifrontal
ECT that is in the preferred range (Beale et al,
1994; Petrides & Fink, 1996). The single
dosage dial configuration also facilitates rapid
stimulus titration using the latest age-based
titration steps. |
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| EASY ON-SITE UPGRADES |
| Because the
special computer-automated programs of the
Thymatron® System IV are stored on REPLACEABLE
MICROCHIPS, future system updates (there have been
SEVERAL already) can easily be accomplished via
chip replacement. |
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| SEIZURE ENERGY INDEX |
| A new, improved
Average Seizure Energy Index measures a dimension
of the seizure -- its intensity -- that is not
reflected in seizure duration (Nobler et al, 1993,
2000; Krystal & Weiner, 1994; Krystal et al,
1995; Suppes et al, 1996; Krystal, 1999; Perera et
al, 2002). |
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| PRINTOUT OF SEIZURE DURATION BY EEG,
EMG, AND EKG CRITERIA |
| The Thymatron®
System IV measures the EEG, EMG, and EKG, and
automatically prints the corresponding seizure
duration estimates with precision and reliability
Larson, Swartz and Abrams, 1984; Swartz et al,
1994; Krystal et al, 1995). |
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| THE PATENTED AUDIBLE EEG© |
| Provides
continuous EEG monitoring even if the recording
paper runs out. It correlates highly with the
visual EEG and keeps you constantly aware of the
progress of the EEG seizure without having to
watch the recording (Swartz & Abrams,
1986). |
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| EXTENDED SEIZURE ALERT |
| Because longer
seizures generate more cognitive side-effects, may
clinicians prefer to terminate seizures that
exceed 120 to 180 seconds on the EEG (Abrams,
2002). To advise the clinician that this point
has been reached, the Thymatron® System IV
provides an intermittent click tone when a
user-selected interval has elapsed after the
stimulus and monitoring has not been
terminated. |
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| RAPID STIMULUS TITRATION |
| Is facilitated
with the Thymatron® System IV using a simple
method-of-limits procedure (McCall et al, 1993;
Rasmussen et al, 1994) or the newest method using
age-based titration steps. |
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