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[Intrapulmonary short-circuit during coronary or aortic valve heart surgery]
I Porras1, J Solera, R Martínez
1Servicio de Anestesiología, Reanimación y Terapia del Dolor, Hospital Universitario de Canarias, La Laguna, Tenerife.
Revista Espanola De Anestesiologia Y Reanimacion
|January 1, 1993
Summary
Cardiac surgery increases intrapulmonary shunt, particularly coronary procedures. However, this temporary alteration in gas exchange has no significant clinical impact, requiring no special interventions.
Area of Science:
- Anesthesiology
- Cardiothoracic Surgery
- Pulmonary Physiology
Background:
- Investigating perioperative gas exchange alterations during cardiac surgery.
- Utilizing intrapulmonary shunt measurement to assess these changes.
Purpose of the Study:
- To evaluate the impact of cardiac surgery on intrapulmonary shunt.
- To compare shunt changes between myocardial revascularization and aortic valve replacement surgeries.
Main Methods:
- Studied 40 patients undergoing cardiac surgery, divided into two groups.
- Measured intrapulmonary shunt five times perioperatively, including during and after extracorporeal circulation.
- Group 1 received nitroglycerin and nifedipine, while Group 2 had standard anesthesia.
Main Results:
- An increase in intrapulmonary shunt was observed post-extracorporeal circulation in both groups, returning to baseline later.
- A greater shunt increase occurred in the myocardial revascularization group (Group 1), with significant differences noted at the start and end of extracorporeal circulation.
- Shunt variations were not correlated with preoperative pulmonary function or extracorporeal circulation duration.
Conclusions:
- Intrapulmonary shunt temporarily increases during cardiac surgery, especially coronary procedures.
- Despite the increase, the clinical significance of these shunt alterations is negligible.
- No specific interventions are deemed necessary to manage these perioperative shunt changes.