Diagnostic classification of organic psychiatric disorders after aneurysmal subarachnoid hemorrhage: a comparison between ICD‐10, DSM‐IV and the Lindqvist & Malmgren classification system

OBJECTIVE: There is no universally accepted consensus for organic psychiatric disorders (OPDs) between the two major classifications, ICD-10 and DSM-IV. The aim was to compare the coverage of these systems with the Lindqvist & Malmgren (LM) classification system for organic psychiatry. METHOD: Organic psychiatric disorders were diagnosed according to ICD-10, DSM-IV, and the LM system in 119 patients 12 months after surgery as a result of aneurysmal subarachnoid hemorrhage. RESULTS: Among 35 patients with astheno-emotional (AE) disorder (LM system), 83% (95% CI: 67-92%) had mild cognitive disorder (MCD) according to ICD-10 clinical descriptions and diagnostic guidelines (CDDG), 49% (95% CI: 33-64%) had MCD according to ICD-10 diagnostic criteria for research (DCR), and 34% (95% CI: 21-51%) had mild neurocognitive disorder according to DSM-IV. The coverage for other OPDs did not differ between the systems. CONCLUSION: The coverage for AE disorder (LM system) was significantly higher than the corresponding diagnoses of the ICD-10 and DSM-IV systems. Modifications of the latter systems are suggested.