scholarly journals Characterization of biological types of cattle (Cycle VII): Influence of postpartum interval and estrous cycle length on fertility12

2007 ◽  
Vol 85 (9) ◽  
pp. 2156-2162 ◽  
Author(s):  
R. A. Cushman ◽  
M. F. Allan ◽  
R. M. Thallman ◽  
L. V. Cundiff
Keyword(s):  
Estrous Cycle ◽  
Cycle Length

Characterization of responses of neonatal sinus and AV nodes to critically timed, brief vagal stimuli

1991 ◽  
Vol 260 (2) ◽  
pp. H459-H464 ◽  
Author(s):  
S. Yamasaki ◽  
A. Stolfi ◽  
A. S. Pickoff
Keyword(s):  
Cycle Length ◽  
Cardiac Cycle ◽  
Gradual Increase ◽  
Latency Period ◽  
Atrial Pacing ◽  
Response Curves ◽  
Stimulus Train ◽  
Sinus Cycle Length ◽  
The Right

We studied the responses of sinus cycle length and atrioventricular (AV) nodal conduction to brief, critically timed vagal stimuli in 25 neonatal (9.6 +/- 3.1 days) canines. Vagal stimuli were delivered to the right or left decentralized cervical vagosympathetic trunk as either a single, brief stimulus train or a repetitive, phase-coupled train with both stimulation paradigms programmed to scan the entire cardiac cycle. The effects of brief vagal stimuli on cardiac cycle length were measured while the heart was beating spontaneously, and the vagal effects on AV nodal conduction were measured while the cycle length was held constant by atrial pacing at 300 ms. Neither changes in sinus cycle length nor AV nodal conduction demonstrated classical phase dependency, i.e., a gradual increase in the magnitude of the vagal response as stimuli are delivered progressively later in the cardiac cycle until the latency period (that point in the cardiac cycle at which vagal stimulation no longer affects the next cardiac cycle) is reached. Phase-response curves (PRCs) to single and repetitive stimuli typically exhibited either a flat response or a small decrease in magnitude as the latency period of the PRC was approached. Thus the neonatal sinus and AV node PRCs exhibit a different configuration than that reported in the adult.

Effect of Photoperiod on Estrous Cycle Length in the Rat

Endocrinology ◽  
1968 ◽  
Vol 83 (6) ◽  
pp. 1355-1357 ◽  
Author(s):  
JOAN C. HOFFMANN
Keyword(s):  
Estrous Cycle ◽  
Cycle Length

scholarly journals Characterization of Electrograms from Multipolar Diagnostic Catheters during Atrial Fibrillation

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Prasanth Ganesan ◽  
Elizabeth M. Cherry ◽  
Arkady M. Pertsov ◽  
Behnaz Ghoraani
Keyword(s):  
Atrial Fibrillation ◽  
Catheter Ablation ◽  
Simulation Study ◽  
Cycle Length ◽  
Human Subject ◽  
Conduction Delay ◽  
Ablation Procedure ◽  
Endocardial Surface ◽  
Diagnostic Catheter

Atrial fibrillation (AF) is the most common arrhythmia in USA with more than 2.3 million people affected annually. Catheter ablation procedure is a method for treatment of AF, which involves 3D electroanatomic mapping of the patient's left atrium (LA) by maneuvering a conventional multipolar diagnostic catheter (MPDC) along the LA endocardial surface after which pulmonary vein (PV) isolation is performed, thus eliminating the AF triggers originating from the PVs. However, it remains unclear how to effectively utilize the information provided by the MPDC to locate the AF-sustaining sites, known as sustained rotor-like activities (RotAs). In this study, we use computer modeling to investigate the variations in the characteristics of the MPDC electrograms, namely, total conduction delay (TCD) and average cycle length (CL), as the MPDC moves towards a RotA source. Subsequently, a study with a human subject was performed in order to verify the predictions of the simulation study. The conclusions from this study may be used to iteratively direct an MPDC towards RotA sources thus allowing the RotAs to be localized for customized and improved AF ablation.

scholarly journals Isolation and Characterization of a 30-kDa Endometrial Glycoprotein Synthesized during the Estrous Cycle and Early Pregnancy of the Pig1

1995 ◽  
Vol 53 (5) ◽  
pp. 1038-1050 ◽  
Author(s):  
Rodney D. Geisert ◽  
Mendan J. Dixon ◽  
Thea Pratt ◽  
Raymond A.M. Schmitt ◽  
Bruce A. Lessley ◽  
...  
Keyword(s):  
Estrous Cycle ◽  
Early Pregnancy ◽  
Isolation And Characterization
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