Related Experiment Video
Updated: Jun 22, 2026

Hemodynamic Precision in the Neonatal Intensive Care Unit using Targeted Neonatal Echocardiography
Published on: January 27, 2023
Intermittent cyanosis due to prominent eustachian valve in a newborn infant
Kazushi Yasuda1, Satoru Iwashima, Hiroshi Sugiura
1Department of Pediatrics, Seirei Hamamatsu General Hospital, Shizuoka, Japan. kazyas@v001.vaio.ne.jp
Abstract:
A full-term neonate presented with cyanosis only when sleeping, which was considered due to a prominent eustachian valve, directing blood flow from the inferior vena cava to the left atrium through the foramen ovale resulting in interatrial right-to-left shunting. In addition to the anatomical features, hemodynamic features shortly after birth, such as patent foramen ovale and high pulmonary vascular resistance, were also probably involved in the mechanism responsible for the patient's cyanosis. This case may provide insight into differential diagnosis for cyanotic infants.
More Related Videos
Related Concept Videos
Pulmonary Cycle: Exhalation
Fetal Circulation
Two umbilical arteries transport blood from the fetus to the placenta. At the placenta, the blood absorbs oxygen and nutrients while simultaneously eliminating waste products. This oxygen-enriched and nutrient-rich blood then returns to the fetus through one...
Assessment of Airway, Skin Color, and Use of Accessory Muscles
Introduction
The initial evaluation of a patient's respiratory system...
Cardiovascular System Abnormal Findings II: Auscultation
Abnormal Heart Sounds
Gallops:
Aortic Regurgitation II: Clinical Features and Diagnostic Tests
Mitral Stenosis I: Introduction

