Questão jurídica principal
Whether the surgeon breached his duty of care under a medical mandate by the intraoperative instrument mishap.
Decisão extraída
No breach was established because the expert evidence showed that the surgeon had taken all medically required precautions and had complied with accepted medical rules.
Fundamentação extraída
A doctor in a mandate must exercise due diligence according to objective professional standards, but is not liable for the mere failure of treatment or for guaranteeing a result. Since no violation of accepted medical rules was found, the unexpected displacement of the guide wire did not by itself create contractual liability.