Effect of high-frequency positive-pressure ventilation on halothane ablation of hypoxic pulmonary vasoconstriction
| Autor: | Mark W. Chapleau, Michael G. Levitzky, Jimmy M. Cairo, Stanley M. Hall |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Pulmonary Atelectasis
Pulmonary Circulation Cardiac output medicine.medical_treatment Blood Pressure Atelectasis Critical Care and Intensive Care Medicine Intermittent Positive-Pressure Ventilation Positive-Pressure Respiration Dogs Hypoxic pulmonary vasoconstriction medicine Animals Lung business.industry Ablation medicine.disease High frequency positive pressure ventilation medicine.anatomical_structure Vasoconstriction Anesthesia Breathing Vascular Resistance Halothane business medicine.drug |
| Zdroj: | Critical Care Medicine. 13:641-645 |
| ISSN: | 0090-3493 |
| DOI: | 10.1097/00003246-198508000-00006 |
| Popis: | High-frequency positive-pressure ventilation (HFPPV) was compared to intermittent positive-pressure ventilation (IPPV) during unilateral atelectasis with and without halothane anesthesia. Dogs with electromagnetic flow probes chronically implanted on their main (Qt) and left (Ql) pulmonary arteries were ventilated via Carlen's dual-lumen endotracheal tubes. In eight closed-chest dogs, about 43% of the cardiac output perfused the left lung during bilateral ventilation by either a Harvard animal respirator (IPPV) or a Health-dyne model 300 high-frequency ventilator (HFPPV). Unilateral atelectasis decreased blood flow (Ql/Qt) to that lung. Ql/Qt was 19 +/- 1% with HFPPV during left-lung atelectasis and right-lung ventilation, compared to 32 +/- 1% with unilateral IPPV. This suggests that HFPPV permits stronger hypoxic pulmonary vasoconstriction. Addition of 1% halothane increased blood flow to the atelectatic left lung during unilateral ventilation with IPPV but not with HFPPV. This suggests that halothane decreases the effects of hypoxic pulmonary vasoconstriction during conventional ventilation but not during HFPPV. |
| Databáze: | OpenAIRE |
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