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Related Concept Videos

Factors Influencing Heart Rate01:30

Factors Influencing Heart Rate

The heart rate, or pulse rate, is a vital indicator of cardiovascular health. It reflects the number of times the heart beats per minute. Various physiological and environmental factors influence heart rate, increasing or decreasing cardiac output. Understanding these factors is crucial for assessing heart function and identifying potential health issues.
Let us explore the significant factors affecting heart rate, including age, body temperature, posture, acute pain, chemical influences,...
Hypertension and Regulation of Blood Pressure01:18

Hypertension and Regulation of Blood Pressure

Hypertension, the most common cardiovascular disease, is diagnosed through repeated measurements of elevated blood pressure. Its risks, including damage to the kidney, heart, and brain, are directly proportional to blood pressure levels. Starting from 115/75 mm Hg, the risk of cardiovascular disease doubles with each increment of 20/10 mm Hg. The diagnosis relies on blood pressure measurements, not on patient symptoms, as hypertension is often asymptomatic until end-organ damage is imminent or...
Hypertension II: Pathophysiology01:29

Hypertension II: Pathophysiology

Hypertension is a chronic condition in which the blood's force against artery walls is excessively high, posing risks such as heart disease. The condition's underlying mechanisms involve complex interactions among the cardiovascular, kidney, and autonomic nervous systems.Renin-Angiotensin-Aldosterone System (RAAS): This system significantly influences blood pressure regulation. When blood pressure decreases, the kidneys secrete renin. This enzyme transforms angiotensinogen, a plasma protein,...
Regulation of Heart Rates01:31

Regulation of Heart Rates

The regulation of heart rate is a complex process controlled by the autonomic nervous system (ANS), hormonal influences, and intrinsic cardiac mechanisms. The ANS has two main components: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS).
The SNS increases heart rate through the release of norepinephrine and epinephrine, which act on beta-1 adrenergic receptors in the heart. This action increases the rate of depolarization in the sinoatrial (SA) node, the heart's...
Antihypertensive Drugs: Action of β1 Blockers01:17

Antihypertensive Drugs: Action of β1 Blockers

β1-receptors are primarily located in the heart and kidneys. In cardiac myocytes, these receptors interact with neurotransmitters released by the sympathetic nervous system during heightened activity or danger. As a result, β1-receptors get activated, initiating a series of biochemical processes. Excessive activation of beta receptors due to chronic stress can abnormally increase heart rate and contractility, resulting in high blood pressure or hypertension. To counteract this, β1-blockers...
Hormonal Regulation of Blood Pressure01:17

Hormonal Regulation of Blood Pressure

Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...

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Related Experiment Video

Updated: Jun 2, 2026

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
08:41

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues

Published on: June 3, 2019

Heart rate affects endothelial function in essential hypertension.

Raffaele Maio1, Sofia Miceli, Angela Sciacqua

  • 1Department of Experimental and Clinical Medicine G. Salvatore, University Magna Græcia of Catanzaro, Catanzaro, Italy.

Internal and Emergency Medicine
|May 12, 2011
PubMed
Summary
This summary is machine-generated.

Low heart rate (HR) impairs endothelium-dependent vasodilation in hypertension, increasing cardiovascular risk. This study found bradycardia is linked to higher central aortic pressure and endothelial dysfunction, suggesting a key mechanism in hypertensive patients.

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The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension

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Related Experiment Videos

Last Updated: Jun 2, 2026

Assessment of Vascular Tone Responsiveness using Isolated Mesenteric Arteries with a Focus on Modulation by Perivascular Adipose Tissues
08:41

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Published on: June 3, 2019

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The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension
05:57

The Antihypertensive Effects and Mechanisms of Huotan Jiedu Tongluo Decoction in Rats with H-Type Hypertension

Published on: May 17, 2024

Area of Science:

  • Cardiology
  • Vascular Physiology

Background:

  • Increased heart rate (HR) is a known cardiovascular risk factor.
  • Endothelial dysfunction is an adverse prognostic factor for cardiovascular events.
  • The impact of HR on hemodynamic parameters and endothelial function in hypertension requires further investigation.

Purpose of the Study:

  • To evaluate the effect of HR on central hemodynamic parameters in hypertensive patients.
  • To assess the impact of HR on endothelial function in hypertension.
  • To explore the relationship between HR, central hemodynamics, and endothelial reactivity.

Main Methods:

  • Compared forearm blood flow (FBF) response to acetylcholine (ACh) and sodium nitroprusside (SNP) in hypertensive patients with low HR (≤60 bpm) versus high HR (≥80 bpm).
  • Utilized strain-gauge plethysmography for FBF measurement.
  • Employed transesophageal atrial pacing to modulate HR and radial artery applanation tonometry with pulse wave analysis to derive central aortic pressures.

Main Results:

  • Hypertensive patients with low HR exhibited a significantly lower FBF response to ACh compared to those with high HR (10.6 vs. 13.6 ml × 100 ml(-1) tissue × min(-1)).
  • Vascular resistance was higher in the low HR group (9.3 U) than in the high HR group (7.2 U).
  • Central systolic and pulse pressures were elevated in the low HR group (140/49 mmHg) versus the high HR group (131/39 mmHg). FBF response to SNP was similar between groups.

Conclusions:

  • Low HR negatively impacts endothelium-dependent vasodilation in hypertension.
  • Elevated central aortic pressure and associated hemodynamic factors appear to be the mechanisms underlying bradycardia's interference with endothelial function.
  • Augmentation index emerged as a significant predictor of endothelial dysfunction in multivariate analysis.