Related Experiment Video
Updated: May 17, 2026

Intra-cardiac Side-Firing Light Catheter for Monitoring Cellular Metabolism using Transmural Absorbance Spectroscopy of Perfused Mammalian Hearts
Published on: May 12, 2019
A case of unexplained cyanosis.
Prashilla Soma1, Shiraz Ellemdin
1Department of Physiology, University of Pretoria, Pretoria, South Africa. prashilla.soma@up.ac.za
Hepatopulmonary syndrome (HPS) can cause gas exchange issues alongside heart and lung problems. Early HPS investigation is crucial for patients with unexplained hypoxia, platypnea, or orthodeoxia.
Area of Science:
- Pulmonary Medicine
- Gastroenterology
- Cardiology
Background:
- Hepatopulmonary syndrome (HPS) is increasingly recognized as a cause of gas exchange abnormalities.
- It often co-exists with other cardiopulmonary conditions, complicating diagnosis and management.
Observation:
- Diagnosis of HPS relies on identifying arterial oxygenation abnormalities due to intrapulmonary vasodilatation in liver disease patients.
- No definitive gold-standard diagnostic test currently exists for HPS.
Findings:
- Retrospective data indicate progressive intrapulmonary vasodilatation in many HPS patients over time.
- Significant mortality is associated with progressive HPS.
Implications:
- This case underscores the importance of investigating HPS and right-to-left shunts in patients with unexplained hypoxia.
- Prompt diagnosis and management of HPS are vital for improving patient outcomes in liver disease.
Related Concept Videos
Changes in Skin Color: Clinical Perspectives
Albinism
Albinism is a genetic disorder that affects (completely or partially) the coloring of skin, hair, and eyes. The defect is primarily...
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Assessment of Airway, Skin Color, and Use of Accessory Muscles
Introduction
The initial evaluation of a patient's respiratory system...
Cardiovascular System Abnormal Findings I: Inspection and Palpation
Abnormal findings observed during an inspection
Pneumothorax-I
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
Physical Assessment of the Respiratory Tract II: Inspection
Chest Configuration
The chest configuration can...

