Tetralogy of Fallot pathophysiology: Difference between revisions

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Revision as of 14:59, 16 April 2012

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editors-In-Chief: Priyamvada Singh, M.B.B.S. [2], Keri Shafer, M.D. [3]; Atif Mohammad, M.D.; Assistant Editor-In-Chief: Kristin Feeney, B.S. [4]

Overview

The obstruction of right ventricular outflow in Tetralogy of Fallot causes blood to shunt or flow from the right to left side of heart through the ventricular septal defect. This causes right ventricular hypertrophy and eventual right sided heart failure. There is flow of deoxygenated venous blood from the right side of the heart to the systemic circulation resulting in cyanosis.

Pathophysiology

Tetralogy of Fallot results in low oxygenation of blood due to mixing of oxygenated and deoxygenated blood in the left ventricle through the VSD and preferential flow of both oxygenated and deoxygenated blood from the ventricles through the aorta because of obstruction to flow through the pulmonary valve. This is known as a right-to-left shunt.
Children with tetralogy of Fallot may develop acute severe cyanosis or hypoxic "tet spells". The precise mechanism of these episodes is in doubt, but presumably results from an increase in resistance to blood flow to the lungs with increased preferential flow of desaturated blood to the body.

References

External links

Information by University of Michigan Health System
Diagram of the condition
Information for adults with ToF from the Adult Congenital Heart Association

de:Fallot-Tetralogie it:Tetralogia di Fallot nl:Tetralogie van Fallot nn:Fallots tetrade uk:Тетрада Фалло

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 ==Overview==
-The obstruction of right ventricular outflow in Tetralogy of Fallot causes blood to shunt or flow from the right to left side of heart through the [[ventricular septal defect]].  This causes right ventricular hypertrophy and eventual right sided heart failure.
+The obstruction of right ventricular outflow in Tetralogy of Fallot causes blood to shunt or flow from the right to left side of heart through the [[ventricular septal defect]].  This causes right ventricular hypertrophy and eventual right sided heart failure.  There is flow of deoxygenated venous blood from the right side of the heart to the systemic circulation resulting in [[cyanosis]].
 ==Pathophysiology==

v t e Congenital malformations and deformations of circulatory system (Q20-Q28, 745-747)
Cardiac chambers and connections	Persistent truncus arteriosus - Double outlet right ventricle (Taussig-Bing syndrome) - Transposition of the great vessels (dextro, levo)
Cardiac septa	Ventricular septal defect - Atrial septal defect (Lutembacher's syndrome) - Atrioventricular septal defect (Ostium primum) - Tetralogy of Fallot - Eisenmenger's syndrome
Right: pulmonary and tricuspid valves	pulmonary valves (stenosis, insufficiency) - tricuspid valves (stenosis, atresia) - Ebstein's anomaly
Left: aortic and mitral valves	aortic valves (stenosis, insufficiency, bicuspid) - mitral valves (stenosis, regurgitation) - Hypoplastic left heart syndrome
Other congenital malformations of heart	Dextrocardia - Levocardia - Cor triatriatum
Great arteries	aorta (Patent ductus arteriosus, Aortic coarctation, Interrupted aortic arch, Overriding aorta, Aneurysm of sinus of Valsalva, Vascular ring) - Pulmonary atresia
Great veins	Persistent left superior vena cava - Total anomalous pulmonary venous connection - Scimitar syndrome
Other	Arteriovenous malformation (Cerebral arteriovenous malformation)
See also non-congenital conditions (I, 390-459)

v t e Electrocardiography
Overview	History of the EKG • EKG interpretation basics • Normal sinus rhythm
EKG Complexes	P wave • QRS complex • ST Segment • T wave • T wave alternans • Tombstone T wave • U wave Osborn wave • H wave • K wave • Delta wave NSSTW changes
EKG Intervals	PR Interval • QRS Interval • ST Interval • QT Interval
Conduction System & Bradycardia	Cardiac pacemaker • SA node • AV node• Bundle of His • Purkinje fibers • Sinus bradycardia • First Degree AV Block • Second Degree AV Block • Complete or Third-Degree AV Block • Concealed conduction • AV Junctional Rhythms • LBBB • LAHB • LPHB • RBBB • Trifascicular block
Atrial Arrhythmias	Sinus tachycardia • Premature Atrial Contractions (PACs) • Ectopic Atrial Rhythm • Paroxysmal Atrial Tachycardia (PAT) • Paroxysmal Atrial Tachycardia (PAT) with Block • Multifocal Atrial Tachycardia (MAT) • Atrial Flutter • Atrial Fibrillation • Wandering atrial pacemaker
Ventricular Arrhythmias	Differential Diagnosis of Tachycardia with a Wide QRS Complex • Accelerated Idioventricular Rhythm • Ventricular Parasystole • Premature Ventricular Contractions (PVCs) • Ventricular tachycardia • Ventricular Fibrillation • Sudden cardiac death
EKG Abnormalities in Disease States	Hypertrophy & Dilatation • Right atrial enlargement • Left atrial enlargement • Biatrial enlargement • Left Ventricular Hypertrophy • Right Ventricular Hypertrophy • Biventricular Hypertrophy • Acute myocardial infarction • NSTEMI • STEMI • Tombstone ST elevation • Right ventricular myocardial infarction • Atrial infarction Pre-excitation Syndromes • Wolff-Parkinson-White Syndrome • Lown Ganong Levine Syndrome • Mahaim Type Preexcitation Cardiomyopathies • Arrhythmogenic Right Ventricular Dysplasia • Dilated Cardiomyopathy • Hypertrophic Cardiomyopathy Drug Effects on the EKG • Adenosine • β-blockers • Digitalis • Quinidine • Procainamide • Disopyramide • Lidocaine • Tocainide and Mexiletine • Phenytoin • Encainide, Flecainide and Propafenone • Amiodarone • Bretylium • Ca Channel Blockers • Phenothiazines • Tricyclic Antidepressants • Lithium Congenital Heart Disease • Dextrocardia • Atrial Septal Defect • Ventricular Septal Defect • Tetralogy of Fallot • Conjoined Twins or Siamese Twins • Congenital heart block Electrolyte Disturbances • Hyperkalemia • Hypokalemia • Hypercalcemia • Hypocalcemia • Nonspecific Changes Other Heart Diseases • Pericarditis • Myocarditis • Tamponade • Heart Transplantation • Sick Sinus Syndrome • Long QT Syndrome Inherited Disease • Brugada Syndrome Systemic Diseases • CNS Disease • Cardiac Tumors Heart Transplantation • EKG Changes in patient with Heart Transplantation Exogenous Effects • Hypothermia • Chest Trauma • Insect Bites • Electric Injuries
Technical Issues and Potential Errors in Interpretation	Artifacts • Lead Placement Errors • The EKG in a Patient with a Pacemaker • EKG in athletes

Tetralogy of Fallot pathophysiology: Difference between revisions

Revision as of 14:59, 16 April 2012

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Overview

Pathophysiology

See also

References

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