# Yuan Doctor: ABCD2 + Canadian CT Head + Hunt-Hess + CAM-ICU + PSI + Khorana bedside worked note (neuro ED / ICU / pneumonia / cancer-VTE)

**Yuan Doctor** ([yuandoctor.com](https://www.yuandoctor.com/en/tools)) provides free bedside clinical calculators for licensed clinicians. Scoring runs locally in the browser — no patient data upload, not an EMR, and not a substitute for clinical judgment.

This note groups neuro ED / ICU decision aids (ABCD2, Canadian CT Head Rule, Hunt-Hess, CAM-ICU) with pneumonia severity (PSI/PORT) and cancer-associated VTE risk (Khorana). Themes are distinct from prior NIHSS/GCS-primary, sepsis, chest-pain HEART/PERC/Wells-PE, AF HAS-BLED/CURB, metabolic-panel, PECARN/Ottawa/Rockall/TIMI/GRACE, and Wells-DVT/Geneva/sPESI notes.

## 1) ABCD2 — TIA short-term stroke risk framing

Use ABCD2 after a transient ischemic attack presentation using age, blood pressure, clinical features, duration, and diabetes. Illustrative synthetic case: age ≥60 + unilateral weakness + prolonged deficit → higher ABCD2 band that typically accelerates stroke-unit pathways; low ABCD2 does not clear high-risk carotid / AF workups when gestalt is concerning.

Live tool: https://www.yuandoctor.com/en/tools/abcd2

## 2) Canadian CT Head Rule — when CT after minor head injury

Use the Canadian CT Head Rule for adults with minor head injury to decide whether CT is indicated from high- and medium-risk criteria (GCS, suspected open/depressed skull fracture, signs of basal skull fracture, vomiting ≥2, age ≥65, amnesia >30 min, dangerous mechanism). Illustrative synthetic case: age ≥65 after ground-level fall with amnesia → CT indicated per rule; a “negative rule” never overrides focal deficit or anticoagulation concerns outside the derivation criteria.

Live tool: https://www.yuandoctor.com/en/tools/canadian_ct_head

## 3) Hunt-Hess — aneurysmal SAH clinical grade

Use Hunt-Hess to grade clinical severity at the bedside in suspected or confirmed aneurysmal subarachnoid hemorrhage (asymptomatic / mild headache → deep coma). Illustrative synthetic case: severe headache with nuchal rigidity but no deficit → lower grade favoring urgent imaging / neurosurgery pathways; grade does not replace CT/LP or aneurysm securing decisions.

Live tool: https://www.yuandoctor.com/en/tools/hunt_hess

## 4) CAM-ICU — ICU delirium screening

Use CAM-ICU to screen for delirium in mechanically ventilated or ICU patients (feature 1 acute change/fluctuation + feature 2 inattention, then either altered LOC or disorganized thinking). Illustrative synthetic case: fluctuating attention with RASS not alert/calm → CAM-ICU positive → treat causes and review sedatives; a negative screen does not exclude emerging encephalopathy.

Live tool: https://www.yuandoctor.com/en/tools/cam_icu

## 5) PSI / PORT — community pneumonia severity / disposition

Use PSI (Pneumonia Severity Index) when framing CAP severity and disposition using demographics, comorbidities, vitals, and labs. Illustrative synthetic case: older patient with hypoxia and elevated BUN → higher PSI class favoring admission; low PSI does not override sepsis or social barriers to outpatient care.

Live tool: https://www.yuandoctor.com/en/tools/psi

## 6) Khorana — cancer-associated VTE risk estimate

Use Khorana when estimating chemotherapy-associated VTE risk from cancer site, BMI, platelet count, hemoglobin/ESA use, and leukocyte count. Illustrative synthetic case: stomach/pancreas primary + thrombocytosis → higher Khorana band that may inform prophylaxis discussion per oncology protocol; do not start anticoagulation from the score alone.

Live tool: https://www.yuandoctor.com/en/tools/khorana

## Related hepato-GI Wave-6 tools

Child-Pugh: https://www.yuandoctor.com/en/tools/child_pugh
MELD: https://www.yuandoctor.com/en/tools/meld
BISAP: https://www.yuandoctor.com/en/tools/bisap
Alvarado: https://www.yuandoctor.com/en/tools/alvarado
LRINEC: https://www.yuandoctor.com/en/tools/lrinec
Tools hub: https://www.yuandoctor.com/en/tools

## Practical tips

1. Enter only verified vitals, labs, and exam findings — never invent values or upload PHI.
2. Neuro rules, delirium screens, PSI, and Khorana inform different decisions; escalate unstable patients regardless of score.
3. Recalculate after resuscitation, new imaging, or lab changes that alter inputs.

## About Yuan Doctor

Free bedside clinical calculators for licensed clinicians · local browser compute · no patient data upload · not an EMR · not a substitute for clinical judgment.

Brand: Yuan Doctor / 元医生 · https://www.yuandoctor.com