Neurology & Neurocritical Care
Every neurology & neurocritical care calculator on CalcEngines — unit converters, derived indices and interpretive tools, each with its formula, a worked example and the reference intervals it is judged against.
8 calculators in this section
- ABC/2 Haematoma Volume CalculatorEstimate intracerebral haemorrhage volume as A × B × C ÷ 2. The method approximates the clot as an ellipsoid: it runs 4.5% below an exact ellipsoid and about 20% above CT planimetry on real haematomas, and the error grows with irregular and lobar clots.
- ABCD2 Score CalculatorScore the five ABCD2 items for early stroke risk after a transient ischaemic attack — and read what happened next. Later validation found it discriminates poorly, and NICE now recommends against using it to stratify risk or set referral urgency.
- Cerebral Perfusion Pressure (CPP) CalculatorCPP is mean arterial pressure minus intracranial pressure, and the arithmetic is the easy part. The MAP has to be referenced to the foramen of Monro: a transducer at heart level reads 0.74 mmHg high per centimetre of height difference.
- Glasgow Coma Scale (GCS) CalculatorScore eye opening, verbal and motor response on the 2014 criteria, and read the components as well as the total. The lowest possible total is 3 and never 0, and an untestable component is NT rather than 1.
- Hunt and Hess Grade InterpreterGrade aneurysmal subarachnoid haemorrhage I to V on the 1968 clinical descriptors, including the rule that serious systemic disease moves the patient a grade. Mortality by grade is from a 1,200-patient cohort, and rater agreement is only moderate.
- ICH Score CalculatorScore the five items of the intracerebral haemorrhage score, 0 to 6, and read the 30-day mortality each stratum carried in the single-centre cohort it was derived in. A derivation cohort is not a prognosis for this patient.
- Modified Fisher Scale InterpreterGrade the subarachnoid blood load 0 to 4 from the presenting CT, and read the symptomatic vasospasm incidence reported for each grade. Grades 2 and 3 carry the same reported risk, and rater agreement is only moderate.
- WFNS Subarachnoid Haemorrhage Grade InterpreterGrade aneurysmal subarachnoid haemorrhage I to V from the Glasgow Coma Scale and the presence of a motor deficit. It exists because Hunt and Hess asks for a judgement; it has a gap of its own, at GCS 15 with a focal deficit.