Circadian changes in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in cattle

Csaba Á Bajcsy, J. Reiczigel, O. Szenci

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Objective - To explore diurnal variation in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in pregnant dairy cows. Animals - 14 dairy cows in their third or later pregnancy approximately 6 weeks before expected parturition. Procedure - Throughout a 24-hour period, blood samples were taken at 2-hour intervals and analyzed for ionized calcium (iCa2+), potassium (K+), sodium (Na+), and chloride (Cl-) concentrations and pH. Paired t-tests were used to compare initial and final values. Circadian changes were tested by use of repeated-measures ANOVA. Additionally, a nonparametric analysis was performed for each animal to determine minimal and maximal values for the variables. Results - Significant differences were not detected between initial and final values of any variable. Repeated-measures ANOVA indicated significant diurnal fluctuations in all variables. With the exception of Cl- concentration, nonparametric analysis of individual values also revealed significant changes over time. Conclusions and Clinical Relevance - The magnitude of daily fluctuations does not make it necessary to standardize time of sample collection for routine diagnostic examination of blood iCa2+, Na+, K+, and Cl- concentrations and pH. However, it may be important to standardize time of sample collection in comparative studies in which more discrete differences may be identified.

Original languageEnglish
Pages (from-to)945-948
Number of pages4
JournalAmerican Journal of Veterinary Research
Volume60
Issue number8
Publication statusPublished - Aug 1999

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Potassium Chloride
Sodium Chloride
sodium chloride
chlorides
potassium
Calcium
diurnal variation
calcium
Chlorides
cattle
blood
Analysis of Variance
dairy cows
analysis of variance
sampling
animals
Potassium
sodium
Parturition
pregnancy

ASJC Scopus subject areas

  • veterinary(all)

Cite this

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title = "Circadian changes in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in cattle",
abstract = "Objective - To explore diurnal variation in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in pregnant dairy cows. Animals - 14 dairy cows in their third or later pregnancy approximately 6 weeks before expected parturition. Procedure - Throughout a 24-hour period, blood samples were taken at 2-hour intervals and analyzed for ionized calcium (iCa2+), potassium (K+), sodium (Na+), and chloride (Cl-) concentrations and pH. Paired t-tests were used to compare initial and final values. Circadian changes were tested by use of repeated-measures ANOVA. Additionally, a nonparametric analysis was performed for each animal to determine minimal and maximal values for the variables. Results - Significant differences were not detected between initial and final values of any variable. Repeated-measures ANOVA indicated significant diurnal fluctuations in all variables. With the exception of Cl- concentration, nonparametric analysis of individual values also revealed significant changes over time. Conclusions and Clinical Relevance - The magnitude of daily fluctuations does not make it necessary to standardize time of sample collection for routine diagnostic examination of blood iCa2+, Na+, K+, and Cl- concentrations and pH. However, it may be important to standardize time of sample collection in comparative studies in which more discrete differences may be identified.",
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AU - Reiczigel, J.

AU - Szenci, O.

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N2 - Objective - To explore diurnal variation in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in pregnant dairy cows. Animals - 14 dairy cows in their third or later pregnancy approximately 6 weeks before expected parturition. Procedure - Throughout a 24-hour period, blood samples were taken at 2-hour intervals and analyzed for ionized calcium (iCa2+), potassium (K+), sodium (Na+), and chloride (Cl-) concentrations and pH. Paired t-tests were used to compare initial and final values. Circadian changes were tested by use of repeated-measures ANOVA. Additionally, a nonparametric analysis was performed for each animal to determine minimal and maximal values for the variables. Results - Significant differences were not detected between initial and final values of any variable. Repeated-measures ANOVA indicated significant diurnal fluctuations in all variables. With the exception of Cl- concentration, nonparametric analysis of individual values also revealed significant changes over time. Conclusions and Clinical Relevance - The magnitude of daily fluctuations does not make it necessary to standardize time of sample collection for routine diagnostic examination of blood iCa2+, Na+, K+, and Cl- concentrations and pH. However, it may be important to standardize time of sample collection in comparative studies in which more discrete differences may be identified.

AB - Objective - To explore diurnal variation in blood ionized calcium, sodium, potassium, and chloride concentrations and pH in pregnant dairy cows. Animals - 14 dairy cows in their third or later pregnancy approximately 6 weeks before expected parturition. Procedure - Throughout a 24-hour period, blood samples were taken at 2-hour intervals and analyzed for ionized calcium (iCa2+), potassium (K+), sodium (Na+), and chloride (Cl-) concentrations and pH. Paired t-tests were used to compare initial and final values. Circadian changes were tested by use of repeated-measures ANOVA. Additionally, a nonparametric analysis was performed for each animal to determine minimal and maximal values for the variables. Results - Significant differences were not detected between initial and final values of any variable. Repeated-measures ANOVA indicated significant diurnal fluctuations in all variables. With the exception of Cl- concentration, nonparametric analysis of individual values also revealed significant changes over time. Conclusions and Clinical Relevance - The magnitude of daily fluctuations does not make it necessary to standardize time of sample collection for routine diagnostic examination of blood iCa2+, Na+, K+, and Cl- concentrations and pH. However, it may be important to standardize time of sample collection in comparative studies in which more discrete differences may be identified.

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