Procedural Characteristics

	All	Impella Pre-PCI	Impella Post-PCI
	N = 154 (mean ± SD, median [IQR], or %)	N = 63 (mean ± SD, median [IQR], or %)	N = 91 (mean ± SD, median [IQR], or %)	P-Value
Duration of Impella support, hours	23.7 [3.5 62.7]	22.8 [1.6 52.8]	24.2 [4.2 69.2]	0.39
Median door-to-balloon time,* min	63.5 [40.3 113.5]	112 [79 112]	52 [34 81]	<0.0001
Suspected infarct related artery territory
Left main	16.1%	23.8%	9.5%	0.02
Left anterior descending	52.6%	53.9%	51.4%	0.76
Left circumflex	10.9%	4.8%	16.2%	0.03
Right coronary	16.8%	12.7%	20.3%	0.24
Graft	3.7%	4.8%	2.7%	0.52
Number of diseased vessels	1.8 ± 0.76	1.94 ± 0.72	1.70 ± 0.79	0.07
Number of significant lesions (≥70%)	2.57 ± 1.39	2.74 ± 1.49	2.42 ± 1.28	0.19
Number of vessel treated	1.42 ± 0.63	1.57 ± 0.67	1.30 ± 0.57	0.01
Number of lesions treated	2.02 ± 1.24	2.33 ± 1.40	1.77 ± 1.02	0.006
Number of stents	1.68 ± 1.02	1.94 ± 1.15	1.47 ± 0.85	0.007
TIMI flow [0–1] prior to PCI	80.2%	71.9%	84.8%	0.14
TIMI flow [0–1] post-PCI	8.7%	4.6%	11.9%	0.19

PCI, percutaneous coronary intervention; TIMI, thrombolysis in myocardial infarction; SD, standard deviation.

^*Door-to-balloon time data are presented when available for patients admitted with STEMI or diagnosed with STEMI on admission.