Our objective was to study whether the variations of blood pressure synchronous with respiration depend on the simultaneous changes of heart rate. Power spectral analysis of the heart period or R-R interval, blood pressure, and respiratory activity was performed by fast Fourier transform during 30 min of supine rest in 12 patients between 16 and 23 days after orthotopic heart transplantation and in 12 age- and sex-matched normal control subjects. The components of the variations of the R-R interval and blood pressure associated with respiration [high-frequency (HF) components] were derived from the power spectra. The HF component of the power spectrum of the R-R interval was almost absent in the transplanted patients compared with the control subjects (2.9 vs. 104 ms2; P < 0.001), whereas the HF component of the power spectrum of blood pressure was not significantly different between the two groups (1.72 vs. 1.65 mmHg2 for systolic and 0.35 vs. 0.60 mmHg2 for diastolic blood pressure). Respiratory variations of both systolic and diastolic blood pressure in humans can depend only slightly on the respiratory heart rate variations.
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http://dx.doi.org/10.1152/jappl.1994.76.5.1961 | DOI Listing |
Biochem Biophys Res Commun
January 2025
Department of Ultrasonography, Fuwai Yunnan Hospital, Chinese Academy of Medical, Sciences/Affiliated Cardiovascular Hospital of Kunming Medical University, Kunming, 650102, China. Electronic address:
Pulmonary arterial hypertension (PAH) is a syndrome characterized by increased pulmonary vascular resistance and elevated pulmonary artery pressure, ultimately leading to right heart failure and even death. Increasing evidence implicates the fat mass and obesity-associated protein (FTO) in various metabolic and inflammatory pathways; however, its role in pulmonary endothelial function and PAH remains largely unexplored. In this study, we examined the effects of endothelial cell-specific FTO knockout on PAH development.
View Article and Find Full Text PDFAnn Intern Med
January 2025
Department of Epidemiology and Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins Bloomberg School of Public Health, Baltimore; and Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland (T.M.B.).
Background: Guidelines emphasize quiet settings for blood pressure (BP) measurement.
Objective: To determine the effect of noise and public environment on BP readings.
Design: Randomized crossover trial of adults in Baltimore, Maryland.
J Neurosurg Case Lessons
January 2025
The Trauma and Neuroscience Institutes, St. John's Hospital and Medical Center, Tulsa, Oklahoma.
Background: Direct carotid-cavernous fistulas (CCFs) are relatively rare but dangerous complications of penetrating traumatic brain injury or maxillofacial trauma. A variety of clinical signs have been described, including ophthalmological and neurological ones. In some cases, severely altered cerebral blood flow can present as massive life-threatening bleeding through the nose, subarachnoid hemorrhage, and/or intraparenchymal hemorrhage.
View Article and Find Full Text PDFAppl Physiol Nutr Metab
January 2025
University of Saskatchewan, Saskatoon, Saskatchewan, Canada;
We compared stretching, isometrics, and aerobic exercise for effectiveness in decreasing blood pressure post-exercise. Using a randomized crossover design, 5 males and 4 females (21.3y; normotensive) participated in four 30-minute sessions on separate days: static stretching (30s stretches, major muscle groups), isometric exercise, aerobic cycling (75% VO2peak), and control (rest), with blood pressure and heart rate measured before exercise (or rest) and for 60 minutes post-exercise (or rest).
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