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Regulation of Stroke Volume01:27

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
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A decreasing function describes a relationship where the output consistently declines as the input increases. This means that for any two input values, if one is greater than the other, the corresponding output is smaller. Mathematically, a function f is decreasing on an interval I if for every x1 < x2​ in I, f (x1) > f (x2). This type of behavior is visually identified on a graph that slopes downward from left to right.The nature of a function can be analyzed by calculating...
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A decreased body temperature can occur in patients with hypothermia and frostbite. Heat loss with extended cold exposure overpowers the body's ability to create heat, resulting in hypothermia. Core temperature readings help classify hypothermia. Mild hypothermia is temperatures between 32 °C (89.6 °F) and 35°C (95 °F) and is caused by impaired thermoregulation. Moderate hypothermia is temperatures between 28 C (82.4 °F) and 32 °C (89.6 °F) caused by...
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Spinal anesthesia-induced hypotension is caused by a decrease in stroke volume in elderly patients.

Charlotte Hofhuizen1, Joris Lemson1, Marc Snoeck2

  • 1Department of Critical Care, Radboud University Medical Center, Nijmegen, The Netherlands, charlotte.hofhuizen@radboudumc.nl.

Local and Regional Anesthesia
|March 19, 2019
PubMed
Summary
This summary is machine-generated.

Spinal anesthesia (SA) in elderly patients causes hypotension primarily due to decreased stroke volume, not systemic vascular resistance. Bupivacaine dosage (10mg vs. 15mg) did not significantly alter cardiac output or blood pressure changes during SA.

Keywords:
cardiac outputdosefinger blood pressure measurementintrathecal anesthesialocal anesthetics

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Area of Science:

  • Anesthesiology
  • Geriatric Medicine
  • Cardiovascular Physiology

Background:

  • Hypotension is a common complication of spinal anesthesia (SA), linked to reduced systemic vascular resistance (SVR) and/or cardiac output (CO).
  • The impact of intrathecal bupivacaine dosage on CO changes in elderly patients undergoing SA remains unclear.
  • This study aimed to elucidate the hemodynamic effects of SA in the elderly by examining two distinct intrathecal bupivacaine doses.

Purpose of the Study:

  • To investigate the hemodynamic effects of spinal anesthesia in elderly patients.
  • To compare the impact of two different intrathecal bupivacaine dosages on cardiac output and blood pressure.
  • To determine the primary cause of hypotension following spinal anesthesia in this demographic.

Main Methods:

  • A prospective cohort study involving 64 patients aged over 65 undergoing procedures under SA.
  • Patients received either 15 mg bupivacaine (medium dose [MD]) or 10 mg bupivacaine with 5 μg sufentanil (low dose [LD]).
  • Continuous, noninvasive monitoring of blood pressure and CO was performed using Nexfin™.

Main Results:

  • No significant baseline hemodynamic differences were observed between the MD (n=33) and LD (n=31) groups.
  • Average CO decreased by 11.6% in the MD group and 10.0% in the LD group; SVR showed no significant change.
  • A clinically relevant decrease in stroke volume (>15%) occurred in 67% of the MD group versus 45% in the LD group (P<0.05).

Conclusions:

  • Spinal anesthesia in elderly patients leads to significant decreases in CO and blood pressure.
  • The primary driver of this hemodynamic change is a reduction in stroke volume, not SVR.
  • No significant difference in CO or blood pressure alterations was found between 10 mg and 15 mg bupivacaine dosages.