induction of anaesthesia was carried out using atropine 0.01 mg/kg-1 , fentanyl 0.15 mg or alfentanil 1.5 mg depending on the assigned group : i atropine + fentanyl , ii : atropine + alfentanil , iii : fentanyl , iv : alfentanil , v : control ( no atropine , no analgetic ) , vi : atropine .
C0015846
fentanyl
C0002026
alfentanil