Paclitaxel and Docetaxel (Taxotere) both are Taxane category of chemotherapy agent and they mitotic inhibitors (prevents cell divisions). Paclitaxel can sometimes cause a temporary slowing of the heart rate known as bradycardia, usually harmless. Let this cycle be completed with 5FU + Cisplatin, you would still need to take lot of care.

All the best for the treatment, do remember to have review MRI before third-cycle. Go for it only if 2 cycles have helped.