Comparative Study

Hemodynamic Responses to Tracheal Intubation in Elderly Patients: Intravenous or Spray of Lidocaine versus Fentanyl.

Med Arh. 2017 Dec 1; 71 (6): 424-429.
Comparative Study

Alfentanil as an anesthetic induction agent--a comparison with thiopental-lidocaine.

Anesth. Analg. 1984 Mar 1; 63 (3): 330-4.
Randomized Controlled Trial

[The effect of atropine, fentanyl and alfentanyl on cardiocirculatory parameters and thoracic rigidity in the induction phase of intubation anesthesia].

Anasth Intensivther Notfallmed. 1988 Oct 1; 23 (5): 260-4.