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Related Concept Videos

Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Cardiac Output and Stroke Volume01:11

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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.
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Respiratory Volumes01:15

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
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Respiratory Volumes and Capacities01:22

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The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
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Exercise and Cardiac Output01:17

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
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Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
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Related Experiment Video

Updated: Sep 21, 2025

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Lung Fluid Volume during Cardiopulmonary Exercise Testing.

Teruhiko Imamura1, Masakazu Hori1, Nikhil Narang2

  • 1Second Department of Internal Medicine, University of Toyama, Toyama 930-0194, Japan.

Medicina (Kaunas, Lithuania)
|May 28, 2022
PubMed
Summary

Remote dielectric sensing (ReDS) may help monitor lung fluid changes during cardiopulmonary exercise testing in heart failure patients. Lung fluid levels remained stable during exercise, suggesting ReDS is a feasible tool for further investigation.

Keywords:
ReDScongestionheart failurehemodynamics

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Area of Science:

  • Cardiology
  • Pulmonary Medicine
  • Biomedical Engineering

Background:

  • Cardiopulmonary exercise testing (CPET) quantifies exercise capacity in heart failure with reduced ejection fraction (HFrEF).
  • Remote dielectric sensing (ReDS) non-invasively measures lung fluid, often correlating with intracardiac filling pressures.
  • Changes in lung fluid during CPET in HFrEF patients are not well understood.

Purpose of the Study:

  • To investigate the changes in lung fluid levels using ReDS during CPET in patients with HFrEF.
  • To assess the feasibility of ReDS as a complementary tool for monitoring lung fluid dynamics during exercise.

Main Methods:

  • Prospective, proof-of-concept study involving 13 patients with chronic HFrEF.
  • ReDS measurements were taken before and after CPET.
  • Clinical events and hospitalization were monitored post-CPET.

Main Results:

  • ReDS values increased significantly only in one patient receiving inotropic support (25% to 32%).
  • In the remaining 12 patients, ReDS values remained unchanged during CPET.
  • The patient with increased ReDS required hospitalization, while others were discharged without adverse events.

Conclusions:

  • The ReDS system shows potential as a feasible tool for noninvasively assessing lung fluid changes during CPET in HFrEF.
  • Further research is needed to explore the clinical implications of ReDS measurements during exercise in this population.