Abstract
Packed cell volume was determined in 317 cows with uterine prolapse, the condition being in more than half of these cases associated with varying degrees of hypocalcaemia, in 133 cows with parturient paresis and in 73 clinically healthy newly calved cows. Independently of each other uterine prolapse and fall in plasma calcium were associated with a significant rise in PCV. The present investigation demonstrated a marked fall in circulating blood volume in a considerable number of cows suffering from uterine prolapse. The risk of irreversible hypovolemic shock developing in connection with uterine prolapse is not to be neglected, and may be aggravated by the simultaneous occurrence of hypocalcaemia, as several of the compensatory mechanisms are calcium dependent.
Keywords: cow, packed cell volume, uterine prolapse, parturient paresis, hypovolaemic shock.
Sammendrag
Hematokrit er bestemt hos 317 kyr med uterusprolaps som i mer enn halvparten av tilfellene var kombinert med varierende grad av hypokalsemi, 133 kyr med puerperal parese og 73 klinisk friske nybære kyr. Uterusprolaps og senkning i plasmakalsiumnivå var uafhengig av hverandre fulgt av en signifikant stigning i PCV.
Undersøkelsen viser at det hos et betydelig antall kyr med uterusprolaps foreligger en uttalt reduksjon av sirkulerende blodvolum. Fare for utvikling av et irreversibelt hypovolemisk sjokk i forbindelse med uterusprolaps er betydelig, og kan synes å være forøket ved samtidig hypokalsemi, siden flere av de kompensatoriske reaksjoner er kalsiumavhengige.
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