Cardiology

HCM Risk-SCD 5-Year Risk calculator

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

Clinical inputs

Age (years)

Do not use HCM Risk-SCD after prior aborted sudden cardiac death or sustained ventricular tachycardia/ventricular fibrillation. The model is also not validated after septal reduction therapy, in elite athletes, in metabolic or infiltrative diseases, or when LVOT obstruction is purely exercise-induced.

Maximum left-ventricular wall thickness (mm)

Validated maximum wall-thickness range is 10.0–34.9 mm. Do not calculate HCM Risk-SCD when maximum wall thickness is ≥35 mm.

Left atrial anteroposterior diameter (mm)

Maximum left-ventricular outflow-tract gradient at rest or during Valsalva, as applicable (mm Hg)

Enter the maximum resting or Valsalva LVOT gradient, as applicable. Do not use a gradient caused purely by exercise-induced LVOT obstruction.

Family history of sudden cardiac death

Nonsustained ventricular tachycardia

Unexplained syncope

Result

Complete all required inputs to calculate the score.

Formula inputs

Age (years)Accepted range: 16 to 80
Maximum left-ventricular wall thickness (mm)Accepted range: 10 to 34.9
Left atrial anteroposterior diameter (mm)Accepted range: 28 to 67
Maximum left-ventricular outflow-tract gradient at rest or during Valsalva, as applicable (mm Hg)Accepted range: 0 to 154
Family history of sudden cardiac death
Nonsustained ventricular tachycardia
Unexplained syncope

Primary source

Model: O'Mahony C et al. A novel clinical risk prediction model for sudden cardiac death in hypertrophic cardiomyopathy (HCM Risk-SCD). Eur Heart J. DOI: 10.1093/eurheartj/eht439. PMID: 24126876. ESC bands: Elliott PM et al. 2014 ESC Guidelines on diagnosis and management of hypertrophic cardiomyopathy: the Task Force for the Diagnosis and Management of Hypertrophic Cardiomyopathy of the European Society of Cardiology (ESC). Eur Heart J. DOI: 10.1093/eurheartj/ehu284. PMID: 25173338. Scope: patients aged ≥16 years with HCM; not validated at maximum wall thickness ≥35 mm, after septal reduction, in elite athletes, in metabolic/infiltrative syndromes, in patients with prior aborted sudden cardiac death or sustained ventricular tachycardia/ventricular fibrillation, or when LVOT obstruction is purely exercise-induced; use the maximum resting or Valsalva LVOT gradient as applicable. (2014)

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