User's Manual

ST/AR ST Analysis Algorithm
6-40 ECG and Arrhythmia Monitoring
Derived 12 Lead ECG
In view of the high degree of redundancy among the standard 12-lead ECG
leads, it is quite conceivable that a more practical leadset with a smaller
number of judiciously chosen leads can be used to reconstruct the missing
leads. For Hexad derived 12-lead the-6 electrode configuration is the
feasibility of deriving additional chest leads if the two chest electrodes are
placed in several pre-specified standard precordial locations. Using a
standard 5-electrode set in EASI lead placement you can monitor up to 12
standard ECG leads simultaneously and continuously at the bedside. EASI
provides a monitoring method for trending ST segment changes that can
provide an early indication of ischemia.
Caution
Derived ECG and their measurements are approximations to the standard
ECG, and should not be used for diagnostic interpretation.
EASI ST Analysis
With EASI monitoring, ST analysis is performed on up to 12 leads, and an
additional value of ST index is calculated and displayed. Assessment of
EASI-derived 12-lead ST measurement is recommended for adult patients
that meet the following parameters:
 Ages: 33-82 years
 Heights: 147 to 185 cm (58 to 73 in)
 Weights: 53 to 118 kg (117 to 261 lbs)
 Height to Weight Ratios: 1.41 to 2.99 cm/kg (0.25 to 0.54 in/lb)
For additional information on ST monitoring, refer to the ST Segment
Monitoring Application Note, Part Number 452296278611.
ST values are presented in the patient sector and Patient Window for EASI
derived leads along with STindx (ST Index). STindx is a summation of three
ST segment measurements, using the leads that can indicate ST segment
changes in the different locations of the heart:
 anterior lead V2
 lateral lead V5
 inferior lead aVF