Figure 1

Face mask employed by the authors for maintenance of volatile anesthesia in rodents. The face mask in figure A, due to the absence of a diaphragm that permits to achieve a seal on the animal’s nose or neck, did not prevent leakage of oxygen and anesthetic gasses. In figure B it is depicted the face mask used for anesthesia of the mouse after fire ignition. The use of tight-fitting face masks providing a hermetical seal seems necessary during laser surgery under volatile anesthesia in non-intubated rodents.