Related Experiment Video

Updated: Oct 9, 2025

Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia
08:05

Lung CT Segmentation to Identify Consolidations and Ground Glass Areas for Quantitative Assesment of SARS-CoV Pneumonia

Published on: December 19, 2020

14.4K

Coronavirus Disease 2019: Hysteresis Effect of Chest CT and the Correlation with its Severity

Kui Li1, Wei Wang2, Lei Wu3

  • 1Department of Infectious Diseases, Ankang Central Hospital, 85 South Jinzhou Road, Ankang 725000, Shaanxi Province, China.

Current Medical Imaging
|December 21, 2021
PubMed

Insights

Chest CT scans in COVID-19 patients show a hysteresis effect, meaning lung improvements lag behind fever relief. Lower lymphocyte counts and oxygen saturation correlate with increased lung lesion severity.

Area of Science:

  • Medical Imaging
  • Pulmonology
  • Infectious Diseases

Background:

  • Coronavirus disease 2019 (COVID-19) significantly impacts lung health.
  • Understanding the temporal relationship between clinical recovery and imaging findings is crucial for patient management.

Purpose of the Study:

  • To investigate factors influencing chest computed tomography (CT) hysteresis in COVID-19 patients.
  • To determine the relationship between imaging findings and disease severity.

Main Methods:

  • Retrospective analysis of chest CT data from 166 COVID-19 patients across four hospitals.
  • Assessment of lesion volume and calculation of hysteresis time post-fever relief.
  • Multivariate regression analysis to identify correlations between lung lesions, lymphocyte count, and oxygen saturation.

Main Results:

  • A hysteresis effect was observed, with chest CT improvements lagging behind fever relief.
  • Increased percentage of lesion/total lung volume was associated with decreased peripheral blood lymphocyte count and transcutaneous oxygen saturation.

Conclusions:

  • Pulmonary lesions in COVID-19 exhibit a hysteresis effect relative to fever resolution.
  • Disease severity, indicated by lesion volume, may be linked to reduced lymphocyte counts and oxygen saturation.
Abstract

Keywords:
COVID-19CT scanCoronavirus infectionsdigital radiographylymphocytestranscutaneous oximetry.

More Related Videos

Infection of Primary Nasal Epithelial Cells Grown at an Air-Liquid Interface to Characterize Human Coronavirus-Host Interactions09:02

Infection of Primary Nasal Epithelial Cells Grown at an Air-Liquid Interface to Characterize Human Coronavirus-Host Interactions

Published on: September 22, 2023

1.6K
Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans04:40

Identifying Coronary Artery Calcification on Non-gated Computed Tomography Scans

Published on: August 28, 2018

15.4K

Related Concept Videos

Imaging Studies for Cardiovascular System V: CT01:28

Imaging Studies for Cardiovascular System V: CT

Cardiac computed tomography (CT) scanning is an advanced cardiac imaging technique that utilizes CT technology, with or without intravenous (IV) contrast, to produce accurate cross-sectional virtual slices of specific areas of the heart, coronary circulation, and major blood vessels such as the aorta, pulmonary veins, and arteries. The computer processes these slices to generate three-dimensional images. Multidetector CT (MDCT) is a rapid form of CT scanning that captures multiple slices...
91
Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT01:25

Imaging Studies for Cardiovascular System VI: Calcium -Scoring CT

Calcium-Scoring CT ScanA calcium-scoring CT scan, also known as coronary artery calcium (CAC) scan, detects calcium deposits in the coronary arteries. This test assesses the risk of coronary artery disease (CAD), which can lead to cardiovascular events such as angina, heart failure, and sudden cardiac arrest.A calcium-scoring CT scan is generally recommended for individuals at intermediate risk of CAD without symptoms. It includes:Men aged 40-75 and women aged 50-75: Especially those with a...
151
Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
40
Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
422
Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.01:25

Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.

Understanding the variety of primary symptoms and systemic complications that characterize chronic obstructive pulmonary disease (COPD) is crucial for healthcare professionals.
Symptoms of COPD can be classified as primary or systemic. Primary symptoms relate to reduced airflow, while systemic or extrapulmonary symptoms relate to COPD's broader impact on the body.
Primary Symptoms of COPD:
3.0K
Pulmonary Embolism II: Diagnostic Studies and Interprofessional Care01:29

Pulmonary Embolism II: Diagnostic Studies and Interprofessional Care

Diagnosing Pulmonary EmbolismDiagnosing pulmonary embolism (PE) involves clinical assessment and advanced imaging tests. The preferred diagnostic tool is the spiral (helical) CT scan or CT angiography (CTA), which uses intravenous contrast media to visualize the pulmonary vasculature and identify emboli.A ventilation-perfusion (V/Q) scan is an alternative for patients unable to receive contrast media. This scan includes both perfusion and ventilation scanning. Perfusion scanning involves...
67