Can we monitor heart attack in the troponin era: evidence from a population-based cohort study

Table 2 Hierarchical diagnosis and classification of myocardial infarction based on AHA Criteria for non-fatal population estimates

Year	HMDC episodes of care		AHA classification of MI^an (row%, col%)
	Hierarchical diagnosis	Count	Positive MI	Any MI	Not MI
1998	MI	1420	1098 (77.3, 82.9)	1309 (92.2, 80.8)	111 (7.8, 5.8)
	Unstable angina	2011	163 (8.1, 12.3)	233 (11.6, 14.4)	1778 (88.4, 93.5)
	Other IHD^b	22	14 (63.6, 1.1)	20 (90.9, 1.2)	2 (9.1, 0.1)
	Other CVD^b	69	49 (71.0, 3.7)	58 (84.1, 3.6)	11 (15.9, 0.6)
	Total	3522	1324	1620 ^c	1902
2003	MI	1579	1318 (83.5, 74.6)	1479 (93.7, 73.8)	100 (6.3, 7.7)
	Unstable angina	1493	267 (17.9, 15.1)	329 (22.0, 16.4)	1164 (78.0, 90.1)
	Other IHD^b	48	46 (95.8, 2.6)	46 (95.8, 2.3)	2 (4.2, 0.2)
	Other CVD^b	177	137 (77.4, 7.7)	151 (85.3, 7.5)	26 (14.7, 2.0)
	Total	3297	1768	2005 ^c	1292

AHA: American Heart Association; CVD: cardiovascular disease; IHD: ischaemic heart disease; MI: myocardial infarction; Positive MI: AHA Definite or Probable MI; Any MI: AHA Definite/Probable/Possible MI.
^a Luepker et al [12]. Row% represents positive predictive value, col% represents sensitivity.
^b As listed in Table 1 (Other CVD includes chest pain).
^c Includes 66 cases (1998) and 64 cases (2003) downgraded from Definite due to absence of diagnostic troponin test.

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