Cardiology · Emergency Medicine

Modified Sgarbossa Criteria (Smith 2012) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Concordant ST elevation ≥1 mm (same direction as QRS)ST depression ≥1 mm in leads V1–V3

Discordant ST elevation in the lead with the largest ratio (mm; must be ≥1 mm to count)

Allowed range: 0–30 mm

Depth of the S wave in that same lead (mm, enter as a positive number)

Allowed range: 0–50 mm

Result

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Clinical inputs

Concordant ST elevation ≥1 mm (same direction as QRS)
ST depression ≥1 mm in leads V1–V3
Discordant ST elevation in the lead with the largest ratio (mm; must be ≥1 mm to count)Accepted range: 0 to 30
Depth of the S wave in that same lead (mm, enter as a positive number)Accepted range: 0 to 50

Primary source

Smith SW et al. Diagnosis of ST-elevation myocardial infarction in the presence of left bundle branch block with the ST-elevation to S-wave ratio in a modified Sgarbossa rule. Ann Emerg Med. 2012;60:766-776. DOI: 10.1016/j.annemergmed.2012.07.119. PMID: 22939607. Scope: unweighted rule, positive if any of: concordant ST elevation >=1 mm; concordant ST depression >=1 mm in V1-V3; discordant ST elevation >=1 mm with ST/S ratio <= -0.25 (ST elevation >=25% of S-wave depth). (2012)

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