[Difference between arterial and end-tidal carbon dioxide tension during surgery of lumbar herniated disk in general anesthesia].
OBJECTIVE
To determine the correlation of PaCO2 and ETCO2 during operations for lumbar disk herniation in prone position: the influence of position and deliberate hypotension.


METHODS
Prospective, to compare PaCO2, ETCO2, pH, SBE, Pa max, in a group of 10 patients undergoing elective intervention for lumbar disk herniation in prone position and in a control group of 10 patients undergoing interventions for elective non traumatologic orthopaedic surgery of the lower limbs in supine position.


METHODS
Orthopaedic department of a non teaching hospital.


RESULTS
The results for the patients of the supine group were: mean PaCO2 35.26 mmHg (SD 3.045), mean P(a-ET)CO2 3.46 mmHg (SD 1.898), mean pH 7.433 (SD 0.044), mean SBE - 1.16 (SD 1.718), mean Pa max 122.5 mmHg (SD 17.989). In the prone group: mean PaCO2 30.3 mmHg (SD 5.819), mean P(a-ET)CO2 1.4 mmHg (SD 4.445), mean pH 7.430 (SD 0.052), mean SBE-3.93 (SD 3.255), mean Pa max 100.3 (SD 10.945). The difference was significant (p < 0.05) for pH, PaCO2, SBE; in the prone group the variability of P(a-ET)CO2 was greater and the values related with SBE.


CONCLUSIONS
ETCO2 is a useful monitoring for PaCO2 in the situation evaluated but the accuracy of the correlation with PaCO2 is lesser than during standard surgical techniques, the metabolic acidosis observed is probably related to the effects of the peculiar position and the anaesthetic technique.
Magi
E
E
Servizio di Anestesia e Rianimazione, Ospedale S. Donato, USL 23, Arezzo.
Multari
G
G
Recine
C
C
Barberio
O
O
Becattini
G
G
Tellini
A
A
D000328:Adult; D000768:Anesthesia, General; D002245:Carbon Dioxide / Q000097:blood*; D006801:Humans; D007023:Hypotension, Controlled; D007405:Intervertebral Disc Displacement / Q000601:surgery*; D016014:Linear Models; D008159:Lumbar Vertebrae; D008875:Middle Aged; D010313:Partial Pressure; D011187:Posture; D011446:Prospective Studies; D015656:Respiratory Mechanics
D002245:Carbon Dioxide
Differenza fra tensione di anidride carbonica arteriosa e di fine espirazione durante intervento per ernia discale lombare in anestesia generale.