Ortivus AB 410000409 User Manual
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Appendix 10
10.6 MIDA
MIDA is an abbreviation for Myocardial Ischemia Dynamic Analysis.
MIDA trends are used in Coronary Care Units, Intensive Care Units,
Chest Pain Units, Cathlabs and in peri-hospital care to monitor the
degree of myocardial ischemia, success or fail of thrombolytic therapy,
Unstable Angina Pectoris, Angioplasty and other situations when
ischemia monitoring is desirable.
Briefly the MIDA method in MobiMed includes four steps:
1. Every minute a noise-free QRS-complex representing the normal
Briefly the MIDA method in MobiMed includes four steps:
1. Every minute a noise-free QRS-complex representing the normal
beat of the patient is formed from the last minute of ECG signal.
2. The QRS-complex is displayed in the ECG view as a 12-lead or
derived 12-lead (Frank cable) representation.
3. From the QRS-complex a set of trend parameters are calculated
and displayed in the trend view.
4. Trend curves and 12-lead ECG are automatically stored on
MobiMed 300m and transmitted to a HWS.
The trend parameters are calculated either from the 12-lead presenta-
tion or from the vector representation of the ECG.
If a 10-lead cable is used, the three orthogonal vector leads are derived
If a 10-lead cable is used, the three orthogonal vector leads are derived
according to Edenbrandt L, Pahlm O: Vectorcardiogram synthesized
from a 12-lead ECG: Superiority of the inverse Dower matrix.
J Electro-
cardiology 21 (1988); 361-367.
If Frank cable is used, the 12-lead ECG is derived according to Dower
GE. The ECGD: a derivation of the ECG from VCG leads.
J Electro-
cardiology 17 (1984); 189-91.
All trend parameters except for QRS-VD, ST-VM and STC-VM reflect
the ST-deviation in the lead where it is measured. Depending on system
setup the ST-deviation is measured 20, 60 or 80 ms after the end of the
QRS-complex, the so-called J-point.
The QRS-VD, ST-VM and STC-VM include information from the three
The QRS-VD, ST-VM and STC-VM include information from the three
orthogonal vector leads and subsequently condensed information from
the entire heart.