Gasometria e hematologia de potros nascidos de éguas com placentite ascendente.

Abstract

The ascending placentitis is a major cause of premature birth, abortion and birth of compromised foals, may cause hypoxia, and neonatal sepsis. The blood gas and hematology analysis provide important for monitoring the health of foals born to mares with ascending placentitis. The aim of this study is to evaluate the hematology and blood gas values of foals born to mares with ascending placentitis. Nine foals were used and divided into the following groups: three foals born to mares with natural placentitis infection and without treated (group I); four foals born to mares with experimentally induced placentitis and treated (group II); and two foals born to normal mares (group III). For the gas analysis blood samples were collected in three moments 0, 12 and 24 hours after birth, and analyzed pH, PO2, PCO2, HCO3-, EB and SO2. For the hematology blood samples were collected 0, 12, 24, 48 and 72 hours after birth and evaluated the red cells, white cells, fibrinogen and total plasma protein. The pH, EB and HCO3- don t differ between groups. Low PO2 (p=0,0132) in T12 in group I and II compared to group III represent due to placental changes, low capacity of pulmonary oxygenation and hypoxemia. PCO2 did not differ among three groups at T24, representing homogenous PCO2 values 24 hours after birth. PCO2 values presents an adaptive and compensatory response of foals from group II and faster when compared to group I, demonstrating a pH T0 reduced in both groups (I and II) when compared to group III and T24 in the physiological limits; the PCO2 in group I in T24 presents increase to the other groups, characterized a respiratory acidosis without compensation. Observed in the 24 hours after birth groups I and II showed neutrophil/lymphocyte rate decreased, featuring prematurity and delayed adaptive response to extra uterine environment. Foals born to mares with ascending placentitis and untreated have higher blood gases and hematologic changes from the foals born to mares with ascending placentitis and treated, demonstrating a compensatory and slower adaptive response.