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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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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
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Pathophysiology of Cardiac Performance01:29

Pathophysiology of Cardiac Performance

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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Imbalances in Cardiac Output01:26

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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.
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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Pulse01:05

Pulse

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The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
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Right to Left Cardiac Power Output- New Prognosticator in STEMI Patients With Cardiogenic Shock (R-Shock).

Arvind Kalyan Sundaram1, Kyle Gobeil2, Shayal Pundlik1

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Current Problems in Cardiology
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This study explored cardiac power output (CPO) in ST-elevation myocardial infarction (STEMI) patients with cardiogenic shock (CS). Higher right-sided CPO and a lower left-to-right CPO ratio may indicate increased mortality risk.

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Area of Science:

  • Cardiology
  • Critical Care Medicine
  • Hemodynamics

Background:

  • ST-elevation myocardial infarction (STEMI) frequently leads to cardiogenic shock (CS), a condition with high mortality.
  • Cardiac power output (CPO) is a key predictor of outcomes in CS.
  • Combined right and left ventricular failure worsens prognosis in CS.

Purpose of the Study:

  • To evaluate right-sided CPO and the ratio of left to right CPO as predictors of in-hospital mortality in STEMI patients experiencing CS.
  • To investigate the prognostic value of right ventricular performance metrics in this high-risk population.

Main Methods:

  • Retrospective observational study of STEMI patients with CS admitted between January 2014 and December 2018.
  • Inclusion criteria: STEMI with CS within 24 hours of admission, requiring left and right cardiac catheterization.
  • Data analysis included calculation of left and right CPO and logistic regression for mortality prediction.

Main Results:

  • The study analyzed 47 patients with STEMI and CS, with 98.9% developing CS within 24 hours.
  • Mean left CPO was 0.62 (SD 0.3) and mean right CPO was 0.22 (SD 0.13).
  • Logistic regression suggested lower in-hospital mortality with low left CPO, high right CPO, and a low left-to-right CPO ratio (though confidence intervals included 1 for some associations).

Conclusions:

  • This is the first study to assess right-sided CPO and its ratio with left-sided CPO in predicting mortality in STEMI with CS.
  • Preliminary findings indicate a trend towards higher mortality with high right-sided CPO and a low left-to-right CPO ratio.
  • Further validation in larger cohorts is necessary to confirm these exploratory results.