Pressure support-ventilation versus spontaneous breathing with "T-Tube"
for interrupting the ventilation after cardiac operations |
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Authors: | Isabela Scali Louren?o Aline Marques Franco Solange Bassetto Alfredo José Rodrigues |
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Institution: | Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto (FMRP-USP), Ribeirão Preto, SP, Brazil. |
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Abstract: | ObjectiveTo compare pressure-support ventilation with spontaneous breathing through a
T-tube for interrupting invasive mechanical ventilation in patients undergoing
cardiac surgery with cardiopulmonary bypass. MethodsAdults of both genders were randomly allocated to 30 minutes of either
pressure-support ventilation or spontaneous ventilation with "T-tube" before
extubation. Manovacuometry, ventilometry and clinical evaluation were performed
before the operation, immediately before and after extubation, 1h and 12h after
extubation. ResultsTwenty-eight patients were studied. There were no deaths or pulmonary
complications. The mean aortic clamping time in the pressure support ventilation
group was 62 ± 35 minutes and 68 ± 36 minutes in the T-tube group
(P=0.651). The mean cardiopulmonary bypass duration in the
pressure-support ventilation group was 89 ± 44 minutes and 82 ± 42 minutes in the
T-tube group (P=0.75). The mean Tobin index in the pressure
support ventilation group was 51 ± 25 and 64.5 ± 23 in the T-tube group
(P=0.153). The duration of intensive care unit stay for the
pressure support ventilation group was 2.1 ± 0.36 days and 2.3 ± 0.61 days in the
T-tube group (P=0.581). The atelectasis score in the T-tube group
was 0.6 ± 0.8 and 0.5 ± 0.6 (P=0.979) in the pressure support
ventilation group. The study groups did not differ significantly in
manovacuometric and ventilometric parameters and hospital evolution. ConclusionThe two trial methods evaluated for interruption of mechanical ventilation did not
affect the postoperative course of patients who underwent cardiac operations with
cardiopulmonary bypass. |
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Keywords: | Pulmonary ventilation Extracorporeal circulation Ventilator weaning |
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