A factorial experimental design was used to quantify the changes in heart rate produced by stimulation of the cardiac sympathetic and vagal nerves in eleven adult dogs and four puppies, and to quantify the extent of the peripheral sympathetic-vagal interactions. The chronotropic responses to autonomic stimulation were significantly less in the puppies than in the adult dogs, which suggests that autonomic regulation is functionally incomplete in the puppies. In both adult dogs and puppies, the chronotropic responses to autonomic nerve stimulation were bilaterally asymmetrical. The heart rate responses to a given level of right-sided stimulation of either the sympathetic or vagal nerves were greater than those to comparable left-sided stimulation. In both adult dogs and puppies, there were significant sympathetic-vagal interactions, such that the sympathetic enhancement of heart rate was less effective the higher the background level of vagal activity. The sympathetic-vagal interactions were prominent in the puppies as well as in the adult animals, regardless of whether the stimulated sympathetic and vagal nerves were located ipsilaterally or contralaterally to one another. Thus, the mechanisms responsible for the sympathetic-vagal interactions appear to be fully developed in puppies. Also, the cardiac sympathetic nerve endings that originate from one side of the body must lie in close apposition to the cardiac vagal nerve endings that originate from either the same side or from the opposite side of the body.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1093/cvr/17.9.547 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Circadian Misalignment Impacts Cardiac Autonomic Modulation in Adolescence.
Sleep
January 2025
Sleep Research & Treatment Center, Department of Psychiatry & Behavioral Health, Penn State University, College of Medicine, Hershey PA, USA.
Study Objectives: Although heart rate variability (HRV), a marker of cardiac autonomic modulation (CAM), is known to predict cardiovascular morbidity, the circadian timing of sleep (CTS) is also involved in autonomic modulation. We examined whether circadian misalignment is associated with blunted HRV in adolescents as a function of entrainment to school or on-breaks.
Methods: We evaluated 360 subjects from the Penn State Child Cohort (median 16y) who had at least 3-night at-home actigraphy (ACT), in-lab 9-h polysomnography (PSG) and 24-h Holter-monitoring heart rate variability (HRV) data.
Prediction of pre-eclampsia using maternal hemodynamic parameters at 12 + 0 to 15 + 6 weeks.
Ultrasound Obstet Gynecol
January 2025
Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, SAR, China.
Objectives: To compare the maternal hemodynamic profile at 12 + 0 to 15 + 6 weeks' gestation in women who subsequently developed pre-eclampsia (PE) and those who did not, and to assess the screening performance of maternal hemodynamic parameters for PE in combination with the Fetal Medicine Foundation (FMF) triple test, including maternal factors (MF), mean arterial pressure (MAP), uterine artery pulsatility index and placental growth factor.
Methods: This was a prospective case-control study involving Chinese women with a singleton pregnancy who underwent preterm PE screening at 11 + 0 to 13 + 6 weeks' gestation using the FMF triple test, between February 2020 and February 2023. Women identified as being at high risk (≥ 1:100) for preterm PE by the FMF triple test were matched 1:1 with women identified as low risk (< 1:100) for maternal age ± 3 years, maternal weight ± 5 kg and date of screening ± 14 days.
[Research progress on the diagnosis of pediatric heart failure].
Zhongguo Dang Dai Er Ke Za Zhi
January 2025
Department of Cardiovascular Medicine, Children's Hospital of Chongqing Medical University/National Clinical Medical Research Centre for Children's Health and Diseases/National International Science and Technology Cooperation Base for Major Diseases of Children's Development/Key Laboratory of Children's Vital Organ Development and Diseases of Chongqing Municipal Health Commission/National Key Clinical Cardiovascular Specialty, Chongqing 400014, China.
Heart failure is a complex clinical syndrome and pediatric heart failure (PHF) has a high mortality rate. Early diagnosis is crucial for treatment and management of PHF. In clinical practice, various tests and examinations play a key role in the diagnosis of PHF, including continuously updated biomarkers, echocardiography, and cardiac magnetic resonance imaging.
View Article and Find Full Text PDFIndividualized PEEP titration by lung compliance during one-lung ventilation: a meta-analysis.
Crit Care
January 2025
Department of Intensive Care Unit, The First Affiliated Hospital of Jinan University, Guangzhou, China.
Background: Despite the physiological advantages of positive end-expiratory pressure (PEEP), its optimal utilization during one-lung ventilation (OLV) remains uncertain. We aimed to investigate whether individualized PEEP titration by lung compliance is associated with a reduced risk of postoperative pulmonary complications during OLV.
Methods: We searched PubMed, Embase, and the Cochrane Central Register of Controlled Trials until April 1, 2024, to identify published randomized controlled trials that compared individualized PEEP titration by lung compliance with fixed PEEP during OLV.
Catheter-directed therapy for pulmonary embolism in pediatrics: a systematic review and meta-analysis.
Thromb J
January 2025
Pediatric Emergency Department, St. Christopher's Hopsoital for Children, Philadelphia, PA, USA.
Background: Acute pulmonary embolism (PE) is a serious and potentially fatal condition that is relatively rare in the pediatric population. In patients presenting with massive/submassive PE, catheter-directed Therapy (CDT) presents an emerging therapeutic modality by which PE can be managed.
Methods: Electronic databases were systematically searched through May 2024.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!