Pulmological patients are generally in poor general condition, with reduced vital reserves of the lung, poor lung capacity, and limited lung function, and therefore present a risk from the anaesthesiological point of view.

Interventional procedures are usually performed under rigid bronchoscopy.

A new and gentle ventilation technique for flexible bronchoscopy developed by Dr. Veres (Weresch) and Dr. Slavai (Slawai) is being used since 2008 at the Krems Clinic. This ventilation technique has been now routinely used thus far with no complications in nearly 500 patients.

This method is mentioned as the "Veres method".

A so-called jet converter is connected to a commercially available laryngeal mask and the patient is ventilated by the supraglottic approach. The flexible endoscope or the endobronchial ultrasound probe is introduced through the jet converter. Continuous and sufficient ventilation, with no temporal limitations, is ensured throughout the procedure.

Anaesthesia is delivered under intravenous administration of a hypnotic and analgesic agent without muscle relaxation because the technique does not require over-extension of the head as is the case when a rigid bronchoscopy is performed.
Thus, patients with limited mobility and symptoms in the cervical spine can also be investigated in a very gentle manner.

A further advantage of the technique employing the jet converter is that injury to the trachea, the tracheal region or the glottis secondary to the supraglottic position of the laryngeal mask can be avoided.

Thus, ventilation of the patient through the jet converter provides optimal conditions for therapeutic manipulations such as recanalisation, the treatment of benign or malignant stenoses, laser therapy, cryotherapy and argon plasma coagulation as well as electrocoagulation or brachiotherapy.

Superimposed high-frequency jet ventilation ensures optimal contact with the wall of the trachea, which is especially important for EBUS diagnosis.

Although the patients investigated by this procedure usually present with reduced lung compliance and limited lung mechanics, and are generally difficult to ventilate by conventional ventilation procedures, satisfactory oxygenation and ventilation in all phases of the intervention have been achieved by the use of superimposed high-frequency jet ventilation.