. Author manuscript; available in PMC: 2011 May 27.

Published in final edited form as: Circ Cardiovasc Qual Outcomes. 2010 May;3(3):316–323. doi: 10.1161/CIRCOUTCOMES.109.895045

Table 3.

PH-ECG performance and aspirin guideline adherence during baseline and intervention periods.

	Baseline	Intervention	p-value
PH-ECG done by EMS	57% (911/1589^*)	84% (4549/5405^*)	<0.0001
PH-ECG interpreted by EMS	84% (764/911^†)	95% (4334/4549^†)	< 0.0001
PH-ECG for patient with STEMI	77% (13/17^‡)	99% (92/93^‡)	< 0.0001
PH-ECG for patient with ACS	76% (53/70^§)	93% (234/251^§)	< 0.0001
Aspirin given	75% (315/421^∥)	82% (1413/1727^∥)	0.001
Total run time, minutes, median <q1–q3> (n)	22 <18–27> (1525)	22 <18–27> (5328)	0.9

Patients with possible ACS and eligible for PH-ECG

^†

Patients with possible ACS and PH-ECG performed

^‡

Hospital or EMS Medical Director identified STEMI

^§

Hospital identified ACS

^∥

Patients with EMS clinical impression of ACS