To: rkrw who wrote (9019 ) 11/20/2005 3:06:09 PM From: Biomaven Respond to of 10280 xopenex superior on cardiac safety Would be exceedingly difficult to demonstrate given that albuterol is a very safe drug in the first place. There have been a few fatalities associated with albuterol over-use, but it's not really clear if they were totally cardiac-based. From the albuterol label:4. Cardiovascular Effects: PROVENTIL HFA Inhalation Aerosol, like other beta-adrenergic agonists, can produce clinically significant cardiovascular effects in some patients as measured by pulse rate, blood pressure, and/or symptoms. Although such effects are uncommon after administration of PROVENTIL HFA Inhalation Aerosol at recommended doses, if they occur, the drug may need to be discontinued. In addition, beta agonists have been reported to produce ECG changes, such as flattening of the T wave, prolongation of the QT c interval, and ST segment depression. The clinical significance of these findings is unknown. Therefore, PROVENTIL HFA Inhalation Aerosol, like all sympathomimetic amines, should be used with caution in patients with cardiovascular disorders, especially coronary insufficiency, cardiac arrhythmias, and hypertension. 5. Do Not Exceed Recommended Dose: Fatalities have been reported in association with excessive use of inhaled sympathomimetic drugs in patients with asthma. The exact cause of death is unknown, but cardiac arrest following an unexpected development of a severe acute asthmatic crisis and subsequent hypoxia is suspected. We are talking event rates that must be something like a few in a million doses. Based on the recent hospital studies, I do believe they could show an efficacy advantage in severe asthma. To date they've never really demonstrated an efficacy advantage except in dosing frequency, and I assume the same held for the MDI trials or we would have heard about it. It's amazing they have been able to develop the traction they have given the very small label differentiation they have to work with. Peter