Higher death rate in opioid users
The incidence rate of MACE among opioid initiators was 20.6% versus18.9% among NSAID initiators, a difference that was not statistically significant. There were also no significant differences in incidence rates of the individual components of the MACE composite outcome: myocardial infarction, stroke, heart failure, CVD death, or VTE.
There were, however, significantly more deaths from any cause among patients in the opioid group, with an incidence rate of 13.5% versus 10.8% in the NSAID group.
An analysis of the associaion of drug type with outcomes, adjusted for propensity score weight and prior VTE showed that patients on opioids had a statistically significant hazard ratio for death from any cause of 1.33 (95% confidence interval, 1.06-1.67).
The increased risk for all-cause mortality occurred both in patients starting on weak opioids (hydrocodone, tramadol, codeine, pentazocine, and propoxyphene) and on strong opioids (hydromorphone, dihydromorphinone, oxymorphone, butorphanol, methadone, morphine, oxycodone, meperidine, and fentanyl).
As noted before, there was a trend toward an increased risk for VTE among opioid initiators, but this was not statistically significant.
The increase in risk was higher among patients on strong versus weak opioids, suggesting a dose-dependent relationship, Dr. Ozen said.
A comparison of opioid-associated risk for all-cause mortality vs. NSAIDs according to type (nonselective or selective) showed that most of the increase in risk was relative to selective cycloxygenase-2 inhibitors.
‘Beautiful’ analysis
“This is a beautiful piece of analysis on a really difficult question to address because the confounding is really hard to unpick,” commented James Galloway, MBBS, deputy head of the center for rheumatic diseases at King’s College London and consulting rheumatologist at King’s College Hospital, also in London.
“The headline message is that there didn’t appear to be a clear signal that NSAIDs were worse, which is what I thought the preexisting view might have been. And so, people may have paradoxically prescribed opioids in favor of NSAIDs in a person with cardiovascular risk,” he said in an interview. Dr. Galloway attended the oral abstract session but was not involved in the study.
The study was supported by a grant to Dr. Ozen from the Rheumatology Research Foundation. Dr. Galloway reported having no relevant disclosures.