Hemodynamic monitoring was carried out in 9 newborn beagle puppies exposed to hypercarbic insult. 4 animals were exposed to slowly increasing carbon dioxide tensions without hypoxemia; 5 animals were exposed to rapid, intense increases in carbon dioxide tensions without hypoxemia. 2 of the 5 puppies (40%) exposed to the rapid hypercarbia developed intraventricular hemorrhage characteristic of that found in the immature human. All of the puppies exhibited germinal matrix layers comparable to those of 30- to 32-week gestational age human infants. Significantly higher systemic arterial and jugular venous pressures were documented during the baseline and experimental periods in the 2 animals that bled. A predisposition to hemorrhage may have been present in these 2 animals because of hypertension in the baseline period. This preliminary study demonstrates that a histological model for IVH exists in an animal which is stable enough for extensive hemodynamic monitoring.

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