Crossing of the pulmonary valve with the catheter was avoided to prevent precipitation of a hypercyanotic spell.
None of our patients suffered complications related to CT, while two patients suffered hypercyanotic spells with invasive angiocardiography.
28 Senzaki et al29 claimed dexmedetomidine a better option for sedation in TOF patients (particularly small infants) with hypercyanotic spells.
Sedation of hypercyanotic spells in a neonate with tetralogy of Fallot using dexmedetomidine.
More recently, this Blalock-Taussig shunt is placed only if the neonate's oxygen saturations are less than 75% to 80%, if the child experiences hypercyanotic
spells due to severe right-to-left shunting of unoxygenated blood, or if the child is too young or weak to survive complete repair (Jones et al.
Reassessment for such change is key to identifying critical problems, such as new onset cyanosis, hypercyanotic
episodes, or congestive heart failure.