phases_aneurysm_score: PHASES Score for Unruptured Intracranial Aneurysms

Description

Calculates the PHASES score to predict the 5-year risk of aneurysm rupture in patients with unruptured intracranial aneurysms. The score is based on Population, Hypertension, Age, Size of aneurysm, Earlier SAH, and Site of aneurysm.

Usage

phases_aneurysm_score(population, hypertension, age, aneurysm_size_mm,
                      history_sah, aneurysm_site)

Value

A list containing:

PHASES_Score: The calculated total score (Range 0-22).
Risk_5_Year_Rupture: The estimated 5-year absolute risk of aneurysm rupture percentage.

Arguments

population: String. Ethnicity/Population of the patient. "other": North American, European (not Finnish) (0 points). "japanese": Japanese (3 points). "finnish": Finnish (5 points).
hypertension: Numeric (0 or 1). History of hypertension. (1 = Yes).
age: Numeric. Patient age in years. (>= 70 years adds 1 point).
aneurysm_size_mm: Numeric. Maximum diameter of the aneurysm in millimeters. < 7.0 mm: 0 points. 7.0 - 9.9 mm: 3 points. 10.0 - 19.9 mm: 6 points. >= 20.0 mm: 10 points.
history_sah: Numeric (0 or 1). History of Subarachnoid Hemorrhage (SAH) from another aneurysm. (1 = Yes).
aneurysm_site: String. Location of the aneurysm. "ica": Internal Carotid Artery (0 points). "mca": Middle Cerebral Artery (2 points). "posterior_aca_pcom": Posterior circulation, Anterior Cerebral Artery, or Posterior Communicating Artery (4 points).

References

Greving JP, Wermer MJ, Brown RD Jr, et al. Development of the PHASES score for prediction of risk of rupture of intracranial aneurysms: a pooled analysis of six prospective cohort studies. Lancet Neurol. 2014;13(1):59-66. doi:10.1016/S1474-4422(13)70263-1

Examples

Run this code


# Example 1: Low Risk
# US patient, No HTN, Age 50, 4mm ICA aneurysm, No SAH history
# Score = 0 + 0 + 0 + 0 + 0 + 0 = 0
phases_aneurysm_score("other", 0, 50, 4, 0, "ica")

# Example 2: High Risk
# Finnish, HTN, Age 72, 8mm MCA aneurysm, History of SAH
# Score = 5 + 1 + 1 + 3 + 1 + 2 = 13
phases_aneurysm_score("finnish", 1, 72, 8, 1, "mca")

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