Recognition and subsequent treatment of patients with sub-threshold symptoms of depression in primary care.
BACKGROUND
Non-psychiatric physicians are better at correctly ruling out depressive disorders than appropriately recognising them. However, given large numbers of non-depressed patients, a small percentage of false positives equates to a greater number of patients than the number of depressed patients that GPs fail to detect. Concern thus arises that substantial numbers of patients with falsely identified depression may receive inappropriate interventions.


METHODS
Unselected GP consulters were screened with the Hospital Anxiety and Depression Scale (HADS). GPs' perceptions of depression were independently rated on an ICD-10 scale. Case records were reviewed. Analysis related to participants with HADS-D<8. Data were assessed of 660 participants with sub-threshold symptoms. Factors were assessed according to GP ratings.


RESULTS
GP perceived depression in false positive cases were more likely at index visit, to have a mental health presenting problem (OR=6.74 (95% CI=3.21, 14.16); receive antidepressant prescriptions (OR 3.79 (95% CI=1.69, 8.49) and have greater severity of HADS-D score (OR 1.18 (95% CI=1.01, 1.38). Subthreshold cases that GPs identified as depressed, more often had a recording, over subsequent six months, of: depressive symptoms (16 (35%) versus 26 (7%), p<0.001); antidepressant prescriptions (11 (24%) versus 25 (7%), p=0.001); and Community Mental Health Team referrals (4 (9%) versus 1 (<1%), p=0.001). They also consulted GPs more frequently than those not identified (median=5 (IQR 2.8, 6.3) versus median=3 (IQR=2, 5), p=0.004 over six months.


CONCLUSIONS
The HADS is not a diagnostic tool.


CONCLUSIONS
GPs' diagnoses of depressive disorder in patients with sub-threshold symptoms were appropriate. Interventions offered to this group were consistent with documented previous histories.
Applied Health Sciences (Mental Health), University of Aberdeen, Clinical Research Centre, Royal Cornhill Hospital, Aberdeen, AB25 2ZH, United Kingdom. i.m.cameron@abdn.ac.uk
Isobel M
IM
Cameron
Kenneth
K
Lawton
Ian C
IC
Reid
D000328:Adult; D000368:Aged; D000928:Antidepressive Agents / Q000627:therapeutic use; D016009:Chi-Square Distribution; D003866:Depressive Disorder / Q000175:diagnosis* / Q000523:psychology / Q000628:therapy; D003951:Diagnostic Errors / Q000706:statistics & numerical data; D005189:False Positive Reactions; D005260:Female; D058005:General Practitioners / Q000706:statistics & numerical data; D006801:Humans; D057970:Inappropriate Prescribing / Q000706:statistics & numerical data; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D016017:Odds Ratio; D011320:Primary Health Care / Q000706:statistics & numerical data; D011569:Psychiatric Status Rating Scales; D012606:Scotland / Q000453:epidemiology; D018709:Statistics, Nonparametric
D000928:Antidepressive Agents