Cardiovascular System - Heart Rate Development: Difference between revisions

Revision as of 06:48, 27 November 2010

Introduction

Heart rate (beats / minute) is a measurement that can be made from early in development (when the heart first starts) through embryonic and fetal stages into labor and birth. It is a common clinical diagnostic tool, but data can be variable between countries and institutions.

Early ultrasonographic measurement of embryonic heart rate (EHR) shows a steady increase from Stage 9-10 (75 beats/minute) to Stage 18 (130 beats/minute) and on to Stage 20, following which a gradual decrease in EHR occurs (More? Embryonic Heart Rate). This increase correlates with heart development and a low EHR is used as an indicator of developmental failure and likely abortion. Late stethoscope measurements of fetal heart rate can monitor fetal stress and identifies the characteristic "lub-dub" heart valve sounds.

Historic Embryology - Cardiovascular
1902 Vena cava inferior \| 1905 Brain Blood Vessels \| 1909 Cervical Veins \| 1909 Dorsal aorta and umbilical veins \| 1912 Heart \| 1912 Human Heart \| 1914 Earliest Blood-Vessels \| 1915 Congenital Cardiac Disease \| 1915 Dura Venous Sinuses \| 1916 Blood cell origin \| 1916 Pars Membranacea Septi \| 1919 Lower Limb Arteries \| 1921 Human Brain Vascular \| 1921 Spleen \| 1922 Aortic-Arch System \| 1922 Pig Forelimb Arteries \| 1922 Chicken Pulmonary \| 1923 Head Subcutaneous Plexus \| 1923 Ductus Venosus \| 1925 Venous Development \| 1927 Stage 11 Heart \| 1928 Heart Blood Flow \| 1935 Aorta \| 1935 Venous valves \| 1938 Pars Membranacea Septi \| 1938 Foramen Ovale \| 1939 Atrio-Ventricular Valves \| 1940 Vena cava inferior \| 1940 Early Hematopoiesis \| 1941 Blood Formation \| 1942 Truncus and Conus Partitioning \| Ziegler Heart Models \| 1951 Heart Movie \| 1954 Week 9 Heart \| 1957 Cranial venous system \| 1959 Brain Arterial Anastomoses \| Historic Embryology Papers \| 2012 ECHO Meeting \| 2016 Cardiac Review \| Historic Disclaimer

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<Flowplayer height="260" width="320" autoplay="true">Chicken_heartloop 01.flv</Flowplayer>

Chicken embryo heart beat. see movie page

Some Recent Findings

Endothelial cell lineages of the heart. ^[1]

Textbooks

Human Embryology (2nd ed.) Larson Ch7 p151-188 Heart
The Developing Human: Clinically Oriented Embryology (6th ed.) Moore and Persaud Ch14: p304-349
Before we Are Born (5th ed.) Moore and Persaud Ch12; p241-254
Essentials of Human Embryology Larson Ch7 p97-122 Heart
Human Embryology Fitzgerald and Fitzgerald Ch13-17: p77-111

Embryonic Heart Rate

In a 1996 study normal successful human gestations were defined by EHR criteria at different early embryonic (34-56 days from last menstrual period) developmental stages (at the earliest stages when embryo length is difficult to measure gestational sac diameters are included). ^[2]

Stage 9-10 2 mm embryo (gestational sac diameter of 20 mm) EHR at least 75 beats / minute
Stage 11-12 5 mm embryo (gestational sac diameter of 30 mm) EHR at least 100 beats / minute
Stage 16 10 mm embryo EHR at least 120 beats / minute
Stage 18 15 mm embryo EHR at least 130 beats / minute

References

↑ <pubmed>18682987</pubmed>
↑ <pubmed>8921130</pubmed>

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Cite this page: Hill, M.A. (2024, April 19) Embryology Cardiovascular System - Heart Rate Development. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Cardiovascular_System_-_Heart_Rate_Development

What Links Here?

[1] <pubmed>18682987</pubmed>

[2] <pubmed>8921130</pubmed>

[1]

[2]

@@ Line 5: / Line 5: @@
 Early ultrasonographic measurement of embryonic heart rate (EHR) shows a steady increase from Stage 9-10 (75 beats/minute) to Stage 18 (130 beats/minute) and on to Stage 20, following which a gradual decrease in EHR occurs (More? Embryonic Heart Rate). This increase correlates with heart development and a low EHR is used as an indicator of developmental failure and likely abortion. Late stethoscope measurements of fetal heart rate can monitor fetal stress and identifies the characteristic "lub-dub" heart valve sounds.
+{{Template:Heart Links}} | [http://embryology.med.unsw.edu.au/Notes/heart8.htm original page]
 | <Flowplayer height="260" width="320" autoplay="true">Chicken_heartloop 01.flv</Flowplayer>
-Chicken embryo heart beat.
+Chicken embryo heart beat. [[Movie_-_Normal_Chick_Heart|see movie page]]
 |}
-| valign="top" |[[File:Chick_Heart_001-icon.jpg]]
-{{Template:Heart Links}} | [http://embryology.med.unsw.edu.au/Notes/heart8.htm original page]
 ==Some Recent Findings==