[The cardiac index dynamics of patients after the radical correction of tetralogy of Fallot depending on the level of the pressure-support ventilation (PSV) regimen].
Seventeen patients were examined, reoperated on for correction of Fallot's tetralogy on the open heart after a previous aortopulmonary anastomosis. Pressure support ventilation (PSV) was used in all patients during transfer to spontaneous pressure, making use of different levels of pressure support (20, 15, 13, 10, and 8 mm H2O). Decrease of pressure support from 20-15 mm H2O to 13 mm H2O resulted in a sharp increase of cardiac index. We explain this phenomenon by a drastic increase of the respiratory volume during the use of high PSV levels (20-15 mm H2O), surpassing 1.5-2 times the physiological and age-specific norm; this leads to a sharp increase of the mean intrathoracic pressure, disturbing the cardiovascular function.
Nikitin
E S
ES
Tskhovrebov
S V
SV
Zatevakhina
M V
MV
Makrushin
I M
IM
Safronova
E M
EM
Suvorova
G Iu
GIu
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D011175:Positive-Pressure Respiration / Q000295:instrumentation / Q000379:methods; D011184:Postoperative Period; D012119:Respiration; D013771:Tetralogy of Fallot / Q000503:physiopathology* / Q000601:surgery