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[Use of the laryngeal mask in general anesthesia. Clinical experience]
M Viviani1, M Soiat, F Poldini
1Istituto Polidisciplinare di Anestesia, Rianimazione e Terapia Antalgica-Trieste.
Goal Of The Study:
To evaluate the use of the laryngeal mask during general anesthesia.
Study Design:
We prospectively studied patients undergoing surgery with general anesthesia in spontaneous breathing.
Environment:
Urologic and general surgical ward, with standard monitoring equipment.
Patients:
We studied consecutively 100 patients (ASA 1-3, 80 males, 20 females, age 64 +/- 15 years, range 19-98 years); 59 patients had a preexisting cardiopulmonary or metabolic disease. Monitoring included ECG, the arterial pressure (noninvasive), the CO2 capnography (EtCO2), the pulsossimetry (SpO2), the respiratory rate (RR) and the tidal volume/kg (TVi). The double product (DP = heart rate X systolic arterial pressure) was used as an index of cardiac stress. These parameters were recorded at 10-minute intervals throughout the procedure.
Results:
The heart rate, the systolic arterial pressure remained stable during the anesthesia, whereas the DP significantly decreased at t10, t20, t30 and t40. The EtCO2 decreased slightly (from 41 +/- 6 to a 36 +/- 4 mmHg; p.n.s.), SpO2 did not change (from 97 +/- 2% to 96 +/- 2%; p:n.s.). The RR significantly increased at t30 and t40 and the TVi significantly increased during the first hour. No relevant complications have been reported.
Conclusions:
Anesthesia with laryngeal mask was not associated with any detrimental cardiovascular and respiratory effect.