Differential Diagnostic Reasoning Method for Benign Paroxysmal Positional Vertigo Based on Dynamic Uncertain Causality Graph

Algorithm 1

Differential diagnostic reasoning method for BPPV.

	Begin
	For a BPPV patient
	Collect medical evidence, E, including symptoms, signs, examination findings, laboratory tests, and medical histories
	Perform causality simplification to the BPPV causality graph based on the evidence E
	Apply the causality simplification mechanisms including the pruning strategy and causality tracking process
	Obtain the simplified diagnostic causality graph
	Perform the algorithms of weighted logic inference based on the simplified causality graph
	Perform the weighted logic event expansion to the evidence according to (1)
	Perform logic inference according to (2)
	Apply the weighted logic inference rules 1∼6 of differential diagnosis for BPPV
	Apply the scheme of dummy basic variable
	Perform the basic logic operations
	Obtain the hypothesis event space,
	Perform the probabilistic reasonings to obtain the posterior probability of conditioned on E,
	Calculate the ranked independent probability of a BPPV subtype
	End