[Gastroduodenal electric activity, in situ, during anesthesia and recovery. Study in chronic electrode-carrying rats]. / Etude de l'activité électrique gastroduodénale, in situ, au cours de l'anesthésie et du réveil. Etude chez le rat porteur d'électrodes chroniques.

The effect of anaesthesia (sodium pentobarbital, two various doses) was studied in the rat with chronic gastric and duodenal electrodes. Gastric and duodenal electrical activity was recorded in pre- and peranesthesia period. All rhythmic slow and fast components are slowed in the same condition of time when an important decrease of central temperature is observed (external controlled temperature 22 degrees C). Gastric slow wave (650 microV, frequency normal level 5.6 c/min) decreases about 40% in 180 min. The waking arise after 5h30, 1h30 before the complete recuperation of the previous rhythm. For half dose conditions, gastric slow wave frequency decreases about 30% in 30 min; waking up occurs in 90 min. Gastric emptying complex observed previously. Is only observed during 20-30 min of the initial period of the anaesthesia at 50 mg/kg, and throughout the anaesthesia at 25 mg/kg.

[Possibility of a method for dynamic study of abdominal viscera contractility from echographic images. 1st results]. / Possibilité d'une nouvelle exploration dynamique de la contractilité des viscères abdominaux à partir d'images échographiques. Premiers résultats.

Brilliance variations in selected areas of echographic display are recorded in real time thanks to photoconductive integrations from the screen. The areas concerned are: 1) gastroduodenal or colonic wall; 2) intraluminal medium in the same portion of the digestive tract. Simultaneously the pneumogram is recorded with these photometric variations in long period of time (1/2 h-2 h). Visceral displacements or medium echographic modulations give us informations about motricity and hydraulic changes. Several components of frequency are shown: pulse, respiratory interactions and several components of parietal contractions; we can notice the concordance between frequency variations obtained with others technics such as electrosplanchnography or manometry. This possibility of atraumatic confrontations with a visual control allows us new perspectives in physiopathological studies concerning hemodynamic, biomechanic interactions between viscera.