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Table 3 Thrombolysis contraindications achieved by GDL rules

From: Retrospective checking of compliance with practice guidelines for acute stroke care: a novel experiment using openEHR’s Guideline Definition Language

Thrombolysis contraindication

Represented in GDL (yes/no)

Stroke onset more than 4.5 hours ago

Yes

Symptom presentation suggesting another aetiology than that of stroke and/or the patient recovered within 30 minutes

No

Unclear stroke symptoms

No

National Institutes of Health Stroke Scale (NIHSS) score higher than 25

Yes

CT scan shows haemorrhage

Yes

CT scan shows major stroke that covers more than 30% of the middle cerebral artery

No

Blood glucose is lower than 3 mmol/litre or higher than 22 mmol/litre

Yes

Blood pressure is higher than 185/110 mmHg despite two attempts of intravenous beta-blocking bolus treatment (approximately 20 mg of Labetalol per bolus)

No

History of cerebral haemorrhage or intracranial bleeding

Yes

Patient describes an explosive headache (that resembles a subarachnoid haemorrhage)

Yes

Ongoing or recent severe haemorrhage (extracranial or intracranial)

No

Likely postictal paresis

Yes

Suspected septic shock

Yes

Bleeding disorder or anticoagulation treatment

Yes

One of the following: infectious endocarditis, pericarditis, ventricular thrombosis, atrial septal aneurysm, severe heart failure, pancreatitis, severe liver damage

Yes

One of the following in the last week: lumbar puncture, central venous catheter

Yes

One of the following in the last month: operation/biopsy from parenchymatous organs, trauma with internal injuries, duodenal ulcer, bleeding from the urinary tract

Yes

One of the following in the last three months: stroke, head trauma, operation in the central nervous system, definite gastrointestinal bleeding

Yes

Pregnancy, childbirth in the last month, breastfeeding (relative contraindications)

Yes