[Changes in thorax-lung compliance during general anesthesia with mechanical ventilation in response to various intraoperative maneuvers].
BACKGROUND
The author evaluated and compared changes in the thorax-lung compliance (C) of the patients under general anesthesia and mechanical ventilation in response to various intraoperative maneuvers.


METHODS
With ethics committee approval, 60 ASA physical status I and II patients undergoing elective surgery were studied. The author compared C on supine position with no maneuver as control, with C with cephalad liver retraction by the abdominal retractor (AR), pneumoperitoneum by intraabdominal pressure of 12 mmHg (LS), abdominal wall lift (AL), sternal splitting (SS), and sternum lift (SL) position (BMI<or=25kg x m(-2)). Following induction of anesthesia the parameters were measured and recorded. Patients were mechanically ventilated with a tidal volume of 9 ml x kg(-1) and a respiratory rate of 8 breaths per minutes. Statistical analysis was performed with ANOVA and P<0.01 was considered significant.


RESULTS
In the AR and LS groups, C decreased significantly. In the AL, SS and SL groups, C increased significantly.


CONCLUSIONS
The thorax-lung compliance of the AL, SS and SL maneuver groups were physiologically superior to supine position for normal weight patients and these maneuvers avoid derangement of pulmonary functions.
Matsumoto
Kappei
K
Department of Anesthesiology, Higashi-Yamato Hospital.
D000368:Aged; D000768:Anesthesia, General; D017558:Elective Surgical Procedures; D005260:Female; D006801:Humans; D008170:Lung Compliance / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology; D011187:Posture; D016684:Prone Position; D012121:Respiration, Artificial; D015656:Respiratory Mechanics; D016683:Supine Position; D013909:Thorax / Q000502:physiology