Table 1.

Classification systems of HT in ischemic stroke.

HT classification system	Type of HT	Criteria
Clinical	Symptomatic ICH (sICH)	Increase in the NIHSS by >4 points within the first 36 h of stroke onset
	Asymptomatic ICH (aICH)	Increase in the NIHSS by ≤ 4 points within the first 36 h of stroke onset
ECASS	HI1	Small petechial hemorrhagic infarction
	HI2	Confluent petechial hemorrhagic infarction
	PH1	Small parenchymal hemorrhage (<30% of infarct, mild mass effect)
	PH2	Large parenchymal hemorrhage (>30% of infarct, marked mass effect)
Heidelberg Bleeding Classification	1a HI1	Scattered small petechiae, no mass effect
	1b HI2	Confluent petechiae, no mass effect
	1c PH1	Hematoma within infarcted tissue, occupying <30%, no substantive mass effect
	2 PH2	Hematoma occupying 30% or more of the infarcted tissue, with obvious mass effect
	3	Intracerebral hemorrhage outside the infarcted brain tissue or intracranial-extracerebral hemorrhage
	3a	Parenchymal hematoma remote from infarcted brain tissue
	3b	Intraventricular hemorrhage
	3c	Subarachnoid hemorrhage
	3d	Subdural hemorrhage