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Monday, January 29, 2018

Tetralogy Of Fallot

Tetralogy Of Fallot: Definition

Congenital cardiac malformation characterised by:
Right ventricular out flow tract obstruction
Right ventricular hypertrophy
VSD
Overriding aorta

TOF: Pathophysiology

RVOTO + VSD creates ↓ in pulmonary blood flow
RVOTO is progressive and dynamic
Pulmonary oligaemia leads to systemic hypoxemia and invites polycythaemia
RV hypertrophies in response to RVOTO
Polycythaemia increases blood viscosity and promotes thromboses in various vascular beds

 

 

 TOF: Clinical Features

Cyanosis is present by 6wks to 6mths of life.
Dyspnoea on exertion
Squatting
Hypoxic spells
Growth retardation
RV predominance on palpation
Systolic thrill / murmur LSE
Cyanosis and clubbing

TOF: Diagnosis

History
Physical examination
CXR
ECG
ECHO
FBC  + haematocrit

TOF: Treatment

Hypercyanotic attacks
Knee-chest position
Oxygen inhalation ( limited benefit )
Morphine sulphate 0.1- 0.2mg/kg
Phenylephrine 0.02mg/kg IV to increase systemic vascular resistance
Palliative treatment
Systemic pulmonary shunt e.g modified BT shunt.
Definitive treatment
Total intracardiac correction under cardiopulmonary bypass.

2 comments:

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