The aim of this prospective study is to examine the benefits und risks of administration of local anaesthetics with a special atomizing set (Enk Fiberoptic Atomizer, Cook Medical) during flexible bronchoscopy.

Inclusion Criteria:

• bronchoscopy with transbronchial biopsy or cryobiopsy indicated for diagnostic purposes (suspected lung cancer, interstitial lung disease, unexplained pulmonary opacities)
• hospitalized patients
• patients aged 18 years or above
• written informed consent prior to study participation

Exclusion Criteria:

• known allergy to local anesthetics, midazolam or propofol, known epilepsy, known severe neurological or psychiatric disorder, hemodynamic instability with need for vasopressor therapy, acute or chronic decompensated heart failure, respiratory failure with the need for oxygen supplementation of more than 2 l per minute at rest (pO2 > 55 mmHg) or pCO2 > 50 mmHg at ambient air, known upper airway anomalies, surgery or irradiation of the upper airways in the past, contraindication for transbronchial biopsy as published by international guidelines, e. g. bleeding disorders or severe pulmonary hypertension
• women, who are pregnant or breastfeeding
• alcohol or drug abuse
• expected non-compliance
• patients unwilling or unable to give informed consent, patients with limited ability to comply with instructions for this study
• Participation on another clinical trial within the last 3 months
• subjects who are committed to an institution and/or penitentiary by judicial or official order.
• employees of the investigator cooperation companies.