CDC propaganda..and the comparison is to anti-convulsants
There has never been any known cardiac rhythm events, or suppressed activities due to narcotics.
There is decreased respiratory events ( dangerous when overdosing) -which could set off events due to lack of oxygen- but not at therapeutic doses,and not without combinations
Cardiac Effects of Opioid Therapy.
https://www.ncbi.nlm.nih.gov/pubmed/26461073
opioids have little direct negative effect on cardiac contractility. However, opioid administration can be associated with decreased cardiac function when administered in combination with other medications, including benzodiazepines. Opioids can lead to bradycardia and vasodilation, and as a result can rarely lead to edema, hypotension, orthostatic hypotension, and syncope when used at analgesic doses. While most opioids have no effect on cardiac conductivity, methadone, and buprenorphine can prolong QTc, especially when used in patients at increased risk for QTc prolongation. Electrocardiogram (ECG) monitoring of QTc at baseline and following dose increases is appropriate in patients receiving these medications.
CONCLUSIONS:
There are limited data to suggest that chronic opioid administration may be associated with an increased risk for cardiac-related adverse effects.