Low and therapeutic doses of antidepressants are associated with similar response in the context of multimodal treatment of pain.
BACKGROUND
Antidepressants are prescribed in a wide range of doses to treat both depression and chronic pain, with optimal psychopharmacology individualized for each patient. In the past decade more antidepressants from different chemical classes have become available and are being used for the treatment of both chronic pain and depression.


OBJECTIVE
To review the utilization pattern changes and compare response rates of different classes and doses of antidepressants for various pain conditions in the context of multimodal therapies.


METHODS
Chart review.


METHODS
We reviewed 5,916 records at an outpatient multidisciplinary pain center. Of these, 379 records were for patients diagnosed with cancer pain. Because the mechanisms and treatment approaches to cancer pain can differ greatly from non-cancer chronic pain, these records were excluded from the analysis. We assessed 1,506 medical records for patients with chronic non-caner pain who had used at least one antidepressant, with the main outcome measure being the Numeric Rating Pain Scale, 0-10.


RESULTS
Of the 5,916 charts reviewed, 1,506 (25.4%) chronic non-cancer pain charts recorded the prescription of at least one antidepressant. Most patients received a combination of medications and procedures. Of the 450 patients receiving secondary amines, favorable responses were recorded for 340 (76%) patients, while 103 (23%) did not respond and 7 had unknown responses. Of the 492 patients receiving tertiary amines, favorable responses were recorded for 375 (76%) patients, while 113 (23%) did not respond, and 4 had unknown responses. Of the 533 patients receiving SSRI/SNRIs, favorable responses were recorded for 382 (72%) patients, while 147 (28%) did not respond, and 4 had unknown responses. Of the 369 patients receiving atypical antidepressants, favorable responses were recorded for 272 (74%) patients, while 94 (25%) did not respond, and 3 had unknown responses.


CONCLUSIONS
A retrospective study design and the use of antidepressants as a part of multimodal treatment of pain.


CONCLUSIONS
The data suggest that in the context of multimodal treatment for chronic pain, antidepressant therapy at both low and therapeutic doses demonstrates similar response rates. Tricyclic antidepressants (TCAs), which include secondary and tertiary amines, as well as SSRI/SNRIs and atypicals, all appear to show similar favorable response rates.
Bajwa
Zahid H
ZH
Department of Anesthesia, Critical Care, and Pain Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. zbajwa@bidmc.harvard.edu
Simopoulos
Thomas T
TT
Pal
Joshua
J
Kraemer
Jan J
JJ
Chopra
Pradeep
P
Nagda
Jyotsna V
JV
Najib
Umer
U
Celestin
James
J
Sial
Khuram
K
Ahmad
Bilal
B
Warfield
Carol
C
Steinman
Theodore I
TI
Wootton
Joshua
J
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000928:Antidepressive Agents / Q000008:administration & dosage*; D000929:Antidepressive Agents, Tricyclic / Q000008:administration & dosage; D002908:Chronic Disease / Q000628:therapy; D003131:Combined Modality Therapy / Q000379:methods; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care / Q000379:methods; D010146:Pain / Q000188:drug therapy*; D018710:Pain Clinics / Q000706:statistics & numerical data; D059408:Pain Management; D010147:Pain Measurement / Q000379:methods; D017288:Pain Threshold / Q000187:drug effects; D010348:Patient Care Team; D012189:Retrospective Studies; D017367:Selective Serotonin Reuptake Inhibitors / Q000008:administration & dosage; D016896:Treatment Outcome; D055815:Young Adult
D000928:Antidepressive Agents; D000929:Antidepressive Agents, Tricyclic; D017367:Selective Serotonin Reuptake Inhibitors