Avaliação hematológica e hemogasométrica de potros nascidos de éguas com placentite ascendente

The placentitis is a major cause of premature birth, abortion and compromised foal delivery, and may result in hypoxia and sepsis. The blood gas analysis and hematology can provide important information for monitoring the foals born from mares with placentitis, with different degrees of maturity. The aim of this study was to describe the hematological and blood gas values during the first 24 hours of life in foals born from crossbreed mares with experimentally induced placentitis, presenting different degrees of maturity. Sixteen foals, born from mares with experimentally induced ascending placentitis were assigned to three groups according to degree of maturity: premature (n=8), dysmature (n=4), and full-term foals (n=4). Blood samples were collected at birth (0), at 12h and 24h, and hematological evaluation and blood gas variables were measured. In the premature group normocytic normochromic anemia was observed compared to dysmature group at 12h and 24h. The premature group showed lower count of white blood cells at 24h relative to the full-term group (p=0.01). The pH, cHCO3 and SO2 values do not differ among the groups; however the premature group showed respiratory acidosis (pH=7,28). The PCO2 was higher at 0h in the premature foals (p=0.02). In all groups, the PCO2 presented an adaptive curve with reduction between 12h and 24h. The premature foals showed lower base excess (BE) values at birth (p=0.02), confirming the respiratory acidosis in this group. We conclude that the hematological and blood gas response differs between foals with different degrees of maturity. Acidosis in the premature foals at birth, with stabilization and compensation of pH value during the first 12-24h demonstrate the necessity of sequential blood gas analysis in risk foals. This may help identify the clinical response to the process and assist in the establishment of adequate treatment and prognosis for these foals.