Diurnal Variation in Dropped Beats in Horses with a Second Degree Atrioventricular Block

Yamayai, Yoshiki; Kubo, Katsuyoshi; Amada, Akio; Sato, Kei

doi:10.1294/jes1990.4.61

JJES

1993

DOI: 10.1294/jes1990.4.61

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Diurnal Variation in Dropped Beats in Horses with a Second Degree Atrioventricular Block

Yoshiki Yamayai

Katsuyoshi Kubo

Akio Amada

et al.

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Cited by 2 publications

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“…Furthermore, Oberg and Thoren [4] observed that parasympathetic activity was enhanced when the dropped beat was induced by high rate pacing in cats. In addition, we speculate that the mismatch between the atrial rate and AV conduction (the phenomenon in which AV conduction ceases because only the atrial rate increases and the length of the refractory period of AV node is not adequate) may be one of the causes of AV block in horses [8]. We examined the onset mechanism of a second degree AV block in horses by measuring the atrial rate, AV conduction, right atrial pressure and systolic blood pressure, while the dropped beat was induced by atrial pacing before and after a pharmacological autonomic nervous blockade.…”

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confidence: 99%

Relationship between Atrio-Ventricular Conduction and Hemodynamics during Atrial Pacing in Horses.

Yamaya

Kubo²,

Amada³

1997

JES

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The relationship between the atrioventricular (AV) conduction ratio and systolic blood pressure or right atrial pressure during atrial pacing was investigated before and after phamacological autonomic nervous blockade (PAB) in horses. The increase in the pacing rate decreased the AV conduction ratio. Systolic blood pressure increased when the AV conduction ratio became low, but the relevancy of the both stopped being recognized after PAB. Also right atrial pressure decreased with a decrease in the AV conduction ratio irrespective of the presence of PAB. These findings indicate that the onset mechanism of dropped beats involves an interaction among atrial rate, AV conduction, autonomic nervous system, and hemodynamics in horses with a second degree AV block.

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mentioning

confidence: 99%

Relationship between Atrio-Ventricular Conduction and Hemodynamics during Atrial Pacing in Horses.

Yamaya

Kubo²,

Amada³

1997

JES

Self Cite

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Relationships between Diurnal Variation in R-R Interval and Feeding Behavior in the Horse.

Matsui

Sugano

Sawasaki

1994

JES

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Heart rate, R-R intervals and the number of jaw movements were measured simultaneously for a 24-h period in an adult horse in a housed free-moving state. Feeding behavior was characterized by the number of jaw movements. Dropped beats could be monitored from a series o f R-R intervals, and these dropped beats were regarded as second-degree A-V blocks. Thirty-eight dropped beats occurred during a 24-h period. Second-degree A-V blocks frequently occurred in the night (p<0.001) and scarcely occurred in the active feeding periods (p<0 .001). Moreover, the R-R interval periodically fluctuated at rest in the night. It was speculated that this periodical fluctuation in R-R interval is a respiratory sinus arrhythmia. This arrhythmia was not observed during feeding periods. A periodic violent fluctuation in the R-R intervals persisting for about 10 min was observed in the interval between feeding periods in the middle o f the night, and this episode might occur during paradoxical sleep (REM sleep).

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Diurnal Variation in Dropped Beats in Horses with a Second Degree Atrioventricular Block

Cited by 2 publications

References 16 publications

Relationship between Atrio-Ventricular Conduction and Hemodynamics during Atrial Pacing in Horses.

Relationship between Atrio-Ventricular Conduction and Hemodynamics during Atrial Pacing in Horses.

Relationships between Diurnal Variation in R-R Interval and Feeding Behavior in the Horse.

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