For population-based research using the Swedish hospital discharge register, only a primary diagnosis of HF should be considered a definite case unless individually validated.
Only primary HF diagnoses should be used as definite cases in Swedish registry research unless validated; leaves open broader use of secondary codes.
The HF diagnosis in the Swedish hospital discharge register appears slightly less precise than for acute myocardial infarction and stroke. For population-based research, only those with a primary diagnosis of HF in the hospital discharge register should be regarded as definite HF cases, or alternatively the cases should be validated individually.
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Ingelsson et al. (2005) studied this question.
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