Document Detail

Significant beat-to-beat hemodynamic changes in fetal circulation: a consequence of abrupt intrathoracic pressure variation induced by hiccup.
MedLine Citation:
PMID:  10756247     Owner:  NLM     Status:  MEDLINE    
During routine fetal echocardiographic studies, we incidentally observed abrupt beat-to-beat changes in blood flow velocity and direction during bouts of hiccups in fetuses with a normal heart and regular and synchronized atrioventricular cardiac rhythm. The effect of hiccups on blood flow velocity and direction varied depending on the time of occurrence of hiccups during the cardiac cycle. In systole, a significant transient reduction of peak flow velocity occurred at the aortic and pulmonic valves, and brief tricuspid regurgitation appeared synchronously with each hiccup. In diastole, a transient reversal of flow direction was recorded simultaneously with the hiccup at the aorta and ductus arteriosus, and acceleration of peak flow velocity was observed across the tricuspid and mitral valves. Throughout the entire cardiac cycle, marked blood flow acceleration was observed in the superior vena cava, inferior vena cava, and ostium secundum simultaneously with the hiccup. A direct transmission of briefly augmented, negative intrathoracic pressure to a compliant aorta and systemic veins appears to be a reasonable explanation for most of our observations.
A Levi; O Benvenisti; D David
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography     Volume:  13     ISSN:  0894-7317     ISO Abbreviation:  J Am Soc Echocardiogr     Publication Date:  2000 Apr 
Date Detail:
Created Date:  2000-05-16     Completed Date:  2000-05-16     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  8801388     Medline TA:  J Am Soc Echocardiogr     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  295-9     Citation Subset:  IM    
Pediatric Cardiology Unit and the Department of Cardiology, Meir Hospital, Sapir Medical Center, Kfar Sava, Israel.
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MeSH Terms
Blood Flow Velocity
Coronary Circulation*
Coronary Vessels / embryology*,  physiology,  ultrasonography
Fetal Heart / physiology*,  ultrasonography*
Hiccup / physiopathology*
Thorax / physiology
Ultrasonography, Prenatal*

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