Causes of Prehospital Misinterpretations of ST Elevation Myocardial Infarction

Figures & data

Table 1. Patient Characteristics (n = 44611)

	Total
Characteristics	N	%
Gender
Female	22,252	50
Male	22,359	50
Age (median [IQR^*])	65	[52–80]
Race/Ethnicity
Unknown (% of total)	25,830	58.0
Black (% of known)	7,120	38.0
White	5,593	30.0
Hispanic	4,697	25.0
Asian	1,144	6.0
Pacific Islander/Hawaiian	159	1.0
Native American	68	0.4

^* Inter-quartile range.

Figure 1. Case inclusion and classification.

Figure 2. Reasons for false positive interpretation of STEMI (N = 585). ^*Other includes (in order of decreasing frequency): J point marked early in wide QRS, J point marked late, atrial flutter elevated J point, left bundle branch block, cardiac arrest, ventricular rhythm, wrong QRS type averaged, QRS onset marked late in Q wave, intra-ventricular conduction delay, paced rhythm with premature ventricular complexes used, Brugada pattern, QRS onset marked early in negative P wave, ventricular pacing not detected, left ventricular aneurysm, Wolf-Parkinson-White pattern, and hyperkalemia.

Figure 3. Reasons for false negative interpretation of STEMI (N = 47). ^*STEMI statement suppressed.