Related Experiment Video

Updated: Oct 2, 2026

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine
12:37

Surgical Placement of Catheters for Long-term Cardiovascular Exercise Testing in Swine

Published on: February 9, 2016

Effects of converting enzyme inhibition on baroreflex sensitivity in patients with myocardial infarction

D Bonaduce1, M Petretta, G Morgano

  • 1Institute of Internal Medicine, 2nd School of Medicine, Naples, Italy.

Journal of the American College of Cardiology
|September 1, 1992
PubMed

Insights

Captopril significantly improves baroreflex sensitivity in patients recovering from myocardial infarction. This finding suggests angiotensin-converting enzyme inhibition enhances the chronotropic response to baroreceptor stimulation, offering prognostic value.

Area of Science:

  • Cardiology
  • Pharmacology
  • Physiology

Background:

  • Baroreflex sensitivity is a key prognostic indicator post-myocardial infarction.
  • The impact of angiotensin-converting enzyme (ACE) inhibition on baroreflex sensitivity remains uninvestigated in this patient population.

Purpose of the Study:

  • To assess the effect of ACE inhibition with captopril on baroreflex sensitivity in patients with uncomplicated myocardial infarction.

Main Methods:

  • Twenty-five post-myocardial infarction patients received captopril for 4 days, with baroreflex sensitivity measured before and after treatment.
  • A control group of 20 patients received a placebo to account for spontaneous variations.
  • Baroreflex sensitivity was quantified by the linear relationship between phenylephrine-induced blood pressure changes and RR interval variations.

Main Results:

  • Captopril administration significantly increased mean baroreflex sensitivity (6.5 to 11.8 ms/mm Hg, p<0.01).
  • 68% of patients showed an improvement greater than 2 ms/mm Hg.
  • Plasma renin activity also increased significantly post-captopril, while remaining stable in the placebo group.

Conclusions:

  • Captopril treatment significantly enhances baroreflex sensitivity in patients post-myocardial infarction.
  • ACE inhibition improves the chronotropic response to baroreceptor stimulation.
  • Findings suggest potential prognostic benefits of ACE inhibitors in myocardial infarction recovery.
Abstract

More Related Videos

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice09:56

Implantation of Combined Telemetric ECG and Blood Pressure Transmitters to Determine Spontaneous Baroreflex Sensitivity in Conscious Mice

Published on: February 14, 2021

Related Concept Videos

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors01:30

Antihypertensive Drugs: Angiotensin-Converting Enzyme Inhibitors

Angiotensin-converting enzyme (ACE), a vital component of the renin-angiotensin-aldosterone system, is abundant in lung endothelial cells. ACE converts the inactive decapeptide, angiotensin I, into the active octapeptide, angiotensin II. This potent vasoconstrictor narrows blood vessels, increasing resistance to blood flow and elevating blood pressure. Angiotensin II also stimulates aldosterone production, encouraging kidney cells to reabsorb more sodium and water from urine, thereby increasing...
Heart Failure Drugs: Inhibitors of Renin-Angiotensin System01:26

Heart Failure Drugs: Inhibitors of Renin-Angiotensin System

The activation of the sympathetic nervous system and the renin-angiotensin-aldosterone system (RAAS) contributes to cardiac remodeling, and inhibiting the RAAS is a pharmacological target in heart failure management. As a result, neurohumoral modulation is a crucial treatment principle for managing heart failure. This approach involves using medications like ACE inhibitors (ACEIs), angiotensin receptor blockers (ARBs), β-blockers, mineralocorticoid receptor antagonists (MRAs), and neutral...
Heart Failure Drugs: &#946;-Blockers01:22

Heart Failure Drugs: β-Blockers

β-adrenergic antagonists, commonly known as β-blockers, block the effects of sympathetic neurotransmitters such as noradrenaline (NA) and adrenaline (ADR). They have several beneficial effects in heart failure treatment. They reduce heart rate, the force of contraction, and cardiac muscle relaxation. They also slow the atrial-ventricular conduction rate and raise the threshold for arrhythmias. The concentration of β-blockers determines their effects on bronchodilation, vasodilation, and...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send blood...
Neural Regulation of Blood Pressure01:18

Neural Regulation of Blood Pressure

The neural regulation of blood pressure involves intricate interactions between the autonomic nervous system (ANS) and cardiovascular system, ensuring adequate perfusion of tissues. This regulation primarily occurs through baroreceptor and chemoreceptor reflexes, involving both short-term and long-term mechanisms.
Baroreceptor Reflex
Baroreceptors, located in the carotid sinuses and aortic arch, detect changes in blood pressure. When blood pressure rises, these stretch-sensitive receptors...
Heart Failure II: Pathophysiology01:29

Heart Failure II: Pathophysiology

Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...