Tetralogy of Fallot (TOF)

 Tetralogy of Fallot( TOF) 

 

Tetralogy of Fallot( TOF) is the most common cause of natural cyanotic heart complaint and a common cause of a visit to the exigency pediatric cardiology. utmost cases die in their nonage without surgical intervention. 

 It contains the following four blights. 

 Ventricular septal disfigurement( VSD) 

Pulmonary stenosis 

 Overriding of aorta 

 Right ventricular hypertrophy 

 It can also be associated with other anomalies similar as 

Atrial septal disfigurement( ASD) 

 Right-sided aortic bow 

 Absent pulmonary stopcock pattern 

 The abnormal course of coronary highways 

Clinical Features 

 Children are generally cyanotic but cyanosis may not be present in babes because it's only when right ventricular pressure rises equal to or exceeds left ventricular producing right to left shunt. 

 Tetralogy Spell 

 The affected child suddenly becomes cyanosed, frequently after feeding or a crying attack, and may come aponetic and unconscious. These attacks are called tetralogy spells. The cause of the spell may be increased right ventricular exodus inhibition or reduced systemic vascular resistance. 

Fallot's Spell 

 Fever and dehumidification reduce systemic vascular resistance, causing further shunting of blood from right to left side performing in an acute fall in arterial oxygen achromatism called Fallot's spell.  Cases present with briefness of breath and cyanosis. 

 In other children Fallot's spells are uncommon, but cyanosis is frequent. Growth deceleration, digital clubbing, and polycythemia are also seen. Without surgical correction, numerous cases die during immaturity and nonage. 

On Examination 

 Cyanosis 

 Clubbing 

 Right ventricular heave 

Systolic exhilaration along the left sternal border 

 Early systolic murmur 

 The murmur in TOF cases is the murmur of pulmonary stenosis not the murmur of VSD 

 examinations 

Investigations

ECG 

 Shows right atrial and ventricular hypertrophy 

X-ray 

 Shows a large right ventricle and small pulmonary roadway. The heart is" charge-shaped'' in this condition. 

Echocardiography 

 The discontinuity between the aorta and the anterior wall of the ventricular septum 

 The aortic root is large and overrides VSD 

 VSD with the large right to left shunt 

 Right ventricular hypertrophy 

 Aortic regurgitation may be present 

 Thickened pulmonary stopcock 

 Cardiac Catheterization 

 Grade across the pulmonary exodus tract 

 Equalization of RA and LA pressure 

 Normal pulmonary roadway pressure 

 Treatment 

 Total Correction( TC) 

 The definitive operation is total correction of disfigurement by surgical correction of pulmonary stenosis and check of ventricular septal disfigurement( VSD) and can be performed indeed in immaturity. Primary surgical correction may be accepted before age 5, and prognostic after the operation is good. 

 Blalock Shunt 

 If pulmonary highways are exorbitantly small early definitive form isn't possible and a temporary palliative procedure designed to increase pulmonary blood inflow and drop the hypoxia is performed. This consists of the creation of a shunt from a systemic to the pulmonary roadway( SP shunt) by anastomosis between the subclavian roadway to the side of the pulmonary roadway, this is called the Blalock shunt. It gives relief several times; still, total correction is the ultimate thing. palpitation is palpable on the ipsilateral side after the procedure. 

Medical Management 

 Vasodilators increase right to left shut so avoid vasodilators. 

 Fallot's spell may need treatment with Morphine, a beta-blocker, similar to Inderal, sodium bicarbonate, rehydration, and oxygen. squinching position increases systemic vascular resistance. 

 Antibiotic prophylaxis for endocarditis. 

 Particular Experience 

 youthful croakers

 working in adult cardiology exigency generally doesn't fete the cause of briefness of breath in cases of TOF with spell and give diuretics considering it as a symptom of heart failure. As dehumidification is generally the cause of spell, diuretics worsen the condition; on the negative this, an infusion of normal saline improves the briefness of breath.