We use Fentanyl in NH on the ambulance, however we also carry morphine. I use fentanyl for patients with orthopedic injuries and for patients having an MI involving the right ventricle.
Fentanyl does reduce stimulation of cardiac muscle through the beta receptors although I do not know the exact mechanism of this. Fentanyl does not have the same effects on vasculature that morphine does because it does not cause a release of histamine. Studies also show giving patients doses of narcotics often masks the severity of their pain and increases overall mortality in ACS. There really is no need to give a narcotic for vascular dilation when we give nitroglycerin SL and in my service we can even hang IV NTG in the ambulance or put on paste. We also give lopressor which has been shown to decrease mortality by about 30%. The only true value of narcotics in teh MI patient may be to help with sympathetic stimulation secondary to the anxiety one would have, which fenatly does, and since it does not cause the vascular dialtion that morphine does it is much safer for those patients who can easily be killed by NTG and other drugs that reduce preload and afterload such as those having a right V. MI.
Ok I am getting of the soap box now.
Swtooth