phases_aneurysm_score: PHASES Score for Unruptured Intracranial Aneurysms

In cliot: Clinical Indices and Outcomes Tools

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)

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).

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.

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

# 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")

cliot documentation built on Dec. 1, 2025, 1:06 a.m.