Page 55 - Coronary hemodynamics in acute myocardial infarction - Matthijs Bax

Microvascular resistance of infarct and noninfarct coronary arteries
The variable resistance index (baseline microvascular resistance minus minimal microvascular resistance) was disturbed in the acute and subacute phases of AMI in IRAs and non-IRAs but was more pronounced in IRAs (Table 1). After correction for the rate–pressure product, relative values of the variable resistance index (percent baseline resistance index) increased in IRAs from 37% after angioplasty to 57% at 1 week and to 74% at 6 months (p <0.0001) and in non-IRAs from 57% to 70% and 77% (p <0.0001), respectively.
3
Non-IRA
A B C pValue
17.5±5.5
17.9±7.8 40.1±11.9 2.4±0.5 2.5±0.8
5.0±1.5
5.3±2.1
2.2±0.6
2.8±1.2 3.0±1.9
9973±2083
17.8±6.6
14.9±6.4 46.7±16.2 2.7±0.6 3.5±1.1
4.6±1.9
5.7±2.7
1.7±0.6
2.9±14 4.0±2.4
8305±1669
16.7±8.7
14.1±9.1 52.0±20.5 3.3±0.6 4.4±1.6
5.9±2.6
7.7±4.0
1.8±0.7
4.1±2.0 5.9±3.5
8270±1905
A vs B
NS <0.01 <0.05 <0.0001 <0.0001
<0.05
NS
<0.0001
NS <0.01
<0.0001
A vs C
NS <0.05 <0.0001 <0.0001 <0.0001
<0.05
<0.0001
<0.01
<0.0001 <0.0001
<0.0001
B vs C
NS
NS <0.05 <0.0001 <0.0001
<0.0001
<0.0001
NS
<0.0001 <0.0001
NS
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