_id

683a1600c782e11e38d1b113

id

2031

title

ABC/2 Formula for Intracerebral Hemorrhage Volume

full_title

ABC/2 Formula for Intracerebral Hemorrhage Volume

short_title

ABC/2 Formula

med_description

Predicts volume of intracranial hemorrhage from CT measurements.

short_description

ICH volume from CT measurements.

slug

abc2-formula-intracerebral-hemorrhage-volume

description

The ABC/2 Formula for Intracerebral Hemorrhage Volume predicts size of intracranial hemorrhage.

keywords

ABC/2, abc stroke, abc ich, abc calc, abc/2 calc, diameter hemorrhage, ich diameter, mortality stroke hemorrhage, mortality stroke diameter, 30 day stroke mortality, hemorrhage size abc, hemorrhage size mortality, hemorrhage size prognosis, hemorrhage shape abc, hemorrhage shape mortality, hemorrhage shape prognosis, ellipsoid stroke, ellipsoid hemorrhage, s/p CT stroke mortality, s/p CT cva mortality, s/p CT stroke severity,axial CT slices hemorrhage, abc ich calc, abc/2 ich

complaint

[ "AMS", "Headache", "Injury/Trauma" ]

formula

Volume of Hemorrhage = A × B × C × Slices / Hemorrhage Shape A = LengthB = WidthC = Slice Width# Slices with Hemorrhage Present Hemorrhage Shape: If Round/Ellipsoid: 2; Otherwise: 3.(See references below for this update to the formula.) Of note, the volume of an ellipsoid is 4/3 × π × (ABC/2); when you estimate π to be ~3, the volume becomes ABC/2.

evidence

measurements

[ { "name": "Length", "unit": "length_si_mm", "error_min": "0", "error_max": "10000", "warn_min": "0.1", "warn_max": "1000", "conversion": "1", "normal_max_si": "0", "normal_max_us": "0", "normal_min_si": "0", "normal_min_us": "0", "units_si": "mm", "units_us": "mm" }, { "name": "Slices", "unit": "ct_slices", "error_min": "0", "error_max": "100", "warn_min": "0.1", "warn_max": "10", "conversion": "1", "normal_max_si": "0", "normal_max_us": "0", "normal_min_si": "0", "normal_min_us": "0", "units_si": "slices", "units_us": "slices" }, { "name": "Length", "unit": "length_si_cm", "error_min": "0", "error_max": "1000", "warn_min": "0.1", "warn_max": "100", "conversion": "1", "normal_max_si": "0", "normal_max_us": "0", "normal_min_si": "0", "normal_min_us": "0", "units_si": "cm", "units_us": "cm" } ]

information

refrences

{ "Clinical Practice Guidelines": [], "Manufacturer Website": [], "Original/Primary Reference": [ { "href": "https://stroke.ahajournals.org/content/27/8/1304.full", "text": "Kothari RU, Brott T, Broderick JP, et. al. The ABCs of Measuring Intracerebral Hemorrhage Volumes. Stroke.1996; 27: 1304-1305. doi: 10.1161/01.STR.27.8.1304." } ], "Other References": [ { "href": "https://stroke.ahajournals.org/content/24/7/987.full.pdf+html", "text": "Broderick JP, Brott TG, et. al. Volume of intracerebral hemorrhage. A powerful and easy-to-use predictor of 30-day mortality. Stroke. 1993;24:987-93, doi:10.1161/01.STR.24.7.987." } ], "Outcomes": [], "Validation": [ { "href": "https://stroke.ahajournals.org/content/37/2/404.full.pdf", "text": "Huttner HB, Steiner T, Hartmann M, Köhrmann M, Juettler E, Mueller S, Wikner J, Meyding-Lamade U, Schramm P, Schwab S and Schellinger PD. Comparison of ABC/2 Estimation Technique to Computer-Assisted Planimetric Analysis in Warfarin-Related Intracerebral Parenchymal Hemorrhage Stroke. 2006;37:404-408; doi: 10.1161/01.STR.0000198806.67472.5c." } ], "Validations": [] }

pearls

Remember to always measure accurately using the length and width of the largest area of hemorrhage.

usecase

A patient has an intracranial/intracerebral hemorrhage on CT and a clinician wants a fast and accurate method to estimate its size.

reasons

Radiologists and non-radiologists alike can estimate ICH size without the need for volumetric 3D analysis from CT or radiology software, which many non-radiologists are unfamiliar with.

next_advice

All patients with ICH should receive neurosurgical consultation and admission to the hospital.

next_actions

next_management

diseases

[ "Intracranial Hemorrhage" ]

input_schema

[ { "conditionality": null, "default": null, "label_en": "Hemorrhage Shape", "mdcalc_info_concept": null, "name": "hemm_shape", "option_fhir_rules": null, "optional": false, "options": [ { "label": "Round or Ellipsoid", "value": 2 }, { "label": "Irregular, Separated, or Multinodular", "value": 3 } ], "show_points": false, "tips_en": "", "type": "radio" }, { "conditionality": null, "default": null, "fhir_rules": null, "inct": null, "label_en": "Hemorrhage Length", "name": "bl_length", "optional": false, "tips_en": "", "type": "textbox", "unit": "length_si_cm" }, { "conditionality": null, "default": null, "fhir_rules": null, "inct": null, "label_en": "Hemorrhage Width", "name": "bl_width", "optional": false, "tips_en": "", "type": "textbox", "unit": "length_si_cm" }, { "conditionality": null, "default": null, "fhir_rules": null, "inct": null, "label_en": "Number of CT Slices", "name": "slices", "optional": false, "tips_en": "Slice with ≥75% Area of Hemorrhage: Counts as 1 slice; Slice with 25-75% Area of Hemorrhage: Counts as 0.5 slices; Slice with <25% Area of Hemorrhage: Counts as 0 slices", "type": "textbox", "unit": "ct_slices" }, { "conditionality": null, "default": null, "fhir_rules": null, "inct": null, "label_en": "CT Slice Thickness", "name": "sl_thick", "optional": false, "tips_en": "", "type": "textbox", "unit": "length_si_mm" } ]

instructions

Measure length and width on the CT slice with the largest area of hemorrhage. NOTE: CT slices are typically measured in mm, not cm.

published

2022-04-21T20:29:05.954Z

purpose

[ "Formula" ]

search_terms

[ "ich", "bleed", "stroke", "CT" ]

seo

{ "keywords_en": "ABC/2, abc stroke, abc ich, abc calc, abc/2 calc, diameter hemorrhage, ich diameter, mortality stroke hemorrhage, mortality stroke diameter, 30 day stroke mortality, hemorrhage size abc, hemorrhage size mortality, hemorrhage size prognosis, hemorrhage shape abc, hemorrhage shape mortality, hemorrhage shape prognosis, ellipsoid stroke, ellipsoid hemorrhage, s/p CT stroke mortality, s/p CT cva mortality, s/p CT stroke severity,axial CT slices hemorrhage, abc ich calc, abc/2 ich", "meta_description_en": "The ABC/2 Formula for Intracerebral Hemorrhage Volume predicts size of intracranial hemorrhage." }

specialty

[ "Critical Care", "Critical Care (Neurologic)", "Emergency Medicine", "Neurology", "Radiology" ]

departments

[ "Neurologic" ]

tags

[]

version_number

1

versions

[]

related

[ { "calcId": 3802, "short_title_en": "sICH Score", "slug": "secondary-intracerebral-hemorrhage-sich-score" }, { "calcId": 404, "short_title_en": "Hunt & Hess Classification", "slug": "hunt-hess-classification-subarachnoid-hemorrhage" }, { "calcId": 402, "short_title_en": "Intracerebral Hemorrhage (ICH) Score", "slug": "intracerebral-hemorrhage-ich-score" } ]

ismed

false

section

[ "whenToUseViewed", "pearlsPitfallsViewed", "whyUseViewed", "nextStepsViewed", "evidenceViewed" ]

cleaned_departments

[ "neurology" ]

cleaned_use

[ "A patient has an intracranial/intracerebral hemorrhage on CT and a clinician wants a fast and accurate method to estimate its size." ]

pub

false