Lidocaine + Adrenaline Nebulisation, Calcium channel blockers, N Acetylcysteine— can be used for treating refractory bronchospasm very effectively, especially when all others fail. Even in Corona Infection. Lidocaine + Adrenaline, N Acetylcysteine Nebulisation, Is a  very good option, in Acute exacerbation in  COPD patients. Salbutamol, ipratropium, Magnesium Infusion, etc etc — When all these options fail, we can still try such options, which work very effectively.

Calcium channel blockers can also break the toughest Bronchospasms .. by smooth muscle relaxation. Try these and share your views.