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C Steinmann Chavez

Publications and source records attributed to C Steinmann Chavez.

2 recordsLinked to original sources
PubMed1996

[Fetal heart rate measurement and sonographic fetometry for determination of fetal age in sheep].

Fetal heart rate was repeatedly measured in 84 ewes of different breeds during gestation. The Doppler system (83 measurements) and the real-time M-Mode ultrasound system (221 measurements) were used. Furthermore the following fetometric parameters were ascertained in 13 pregnant ewes sonographically once a week: crown-rump-length, width of the head, inter-eye distance, height of the lateral thorax in the region of the cardial septum and caudal of the sternum, as well as the diameter of the thorax and abdomen in each case latero-lateral and ventro-dorsal. The following influencing factors were tested by means of group regression analyses and multiple regression analysis: days before parturition, method of examination, litter size and later birth weight of lams, and heart rate, breeds and diseases of the ewes. A significant regression exists between the days before parturition (d.b.p.) and fetal heart rate (fhr): y (fhr) = 139 + 0.94 x (d.b.p.); r = 0.781 p < 0.001; n = 304. No significant influence was proved for the birth weight, litter size, maternal heart rate, method of examination, breed and health state of the ewes on the fetal heart rate. All fetometric parameters were significantly correlated with the days before parturition. This regression was most evident for the measured value of the ventro-dorsal abdomen (abd. vd., mm): y (abd. vd) = 114.2 -0.966 x (d.b.p.); r = -0.958; p < 0.001, n = 128. The litter size influenced the regression with a significance of p < 0.05. The fetometry is more appropriate for the determination of gestational age and the prediction of parturition than the measurement of the fetal heart rate.

Animals↗
PubMed1995

[Clinical kidney function studies in sheep. III. Pathologic function changes in nephropathies of sheep and in urolithiasis of rams and billy goats].

Examination of renal function have been carried out in sheep with acute prerenal (n = 6), renal (n = 15) or postrenal failure (n = 3), pyelocystitis (n = 4), and in cases of urolithiasis in rams (n = 16) and billy goats (n = 11) respectively. The calculation of parameters was done on the basis of the estimated weight dependent endogenous creatinine excretion. A control group of 56 healthy non pregnant or early pregnant (< 120th day of pregnancy) ewes have been used. The renal creatinine clearance was reduced and the absolute as well as the fractional renal water excretion was enhanced in all groups of sick animals. An elevated fractional excretion of sodium and phosphate could be seen as well. Functional disturbances could be observed in urolithiasis in like manner as in acute renal failure. There was proteinuria, glucosuria, excessive potassium excretion and often decreased plasma concentration of potassium in both syndromes. A hyperkalemia occurred only in the final state of urolithiasis. No clinical outcome of chronic nephropathies could be seen. Mortality of the described acute nephropathies was about 76%. The results of examination were suitable to control the course and restitution of renal function. They were not helpful for differential diagnosis and prognosis of acute renal failure.

Animals↗