Trans-myocardial Extraction of Endothelin-1 Correlates with Increased Microcirculatory Resistance following Percutaneous Coronary Intervention

Table 2

Subgroup analysis.

	Subgroups		t (df)	value
	High IMR (n = 4)	Low IMR (n = 61)
ET-1 TMG extraction (pg/ml)	0.73 ± 0.78	0.17 ± 0.42	2.5 (63)	0.02
	Low CFR (n = 26)	High CFR (n = 39)
ET-1 TMG extraction (pg/ml)	0.27 ± 0.51	0.16 ± 0.42	−1.0 (63)	0.34
	Type 4a MI (n = 19)	No type 4a MI (n = 46)
ET-1 TMG extraction (pg/ml)	0.36 ± 0.56	0.14 ± 0.40	−1.6 (26.0)	0.13

High IMR refers to post-PCI IMRc ≥30 and low CFR refers to post-PCI CFR values < 2. ET-1 TMG extraction is presented as mean ± SD; and t(df) refers to two sample t-value with degrees of freedom.