CAE Athena - The Ischemic Index (Death Spiral)

Recommended Supply Sizes & Ischemic Index
248
CAEAthena
PN: 905K520652 v2.8
THE ISCHEMIC INDEX (DEATH
S
PIRAL)
The Ischemic Index is a measure of the myocardial ischemia modeled using classical determinants.
When an unfavorable oxygen supply/demand ratio occurs, myocardial ischemia follows. The lower
the Ischemic Index, the greater the myocardial ischemia. The Ischemic Index is derived through the
underlying physiological models and cannot be measured clinically.
Favorable supply/demand ratios (slower heart rates, higher blood oxygenation levels) generally
result in a higher Ischemic Index value, whereas unfavorable supply/demand ratios (faster heart
rates, lower blood oxygenation levels) generally result in a lower Ischemic Index value.
The patient’s Ischemic Index value can be viewed by selecting the Ischemic Index widget from the
Patient Status Display.
The table below lists Ischemic Index values and their corresponding patient conditions.
The patient’s response to myocardial ischemia may be altered using the Ischemic Index Sensitivity
parameter found in the Cardiovascular view (Additional Parameters). To make the patient less
sensitive to ischemia, lower the value below the default setting. To make the patient more sensitive,
increase the value above the default setting.
Model-Driven ECG Rhythm Ischemic Index (I.I.)
Normal Sinus Rhythm (NSR) I.I. ≥ 0.90
Mild ST Segment Depression 0.90 > I.I. ≥ 0.70
Moderate ST Segment Depression 0.70 > I.I. ≥ 0.60
Premature Ventricular Contractions (PVCs) 0.60 > I.I. ≥ 0.40
Ventricular Tachycardia (VTach) 0.40 > I.I.
Ventricular Fibrillation (VFib) 1 minute after VTach
Asystole 1 minute after VFib