Most common cause of seizure in newborn is ?
**Core Concept**
In newborns, seizures are often caused by perinatal asphyxia, infection, or metabolic disorders. The most common cause of seizures in this age group is related to hypoxic-ischemic encephalopathy, which occurs due to lack of oxygen and blood flow to the brain during delivery.
**Why the Correct Answer is Right**
Hypoxic-ischemic encephalopathy is a leading cause of seizures in newborns because it leads to neuronal damage and excitotoxicity. The lack of oxygen and blood flow disrupts the normal function of the blood-brain barrier, allowing excitatory neurotransmitters such as glutamate to accumulate and stimulate excessive neuronal activity, resulting in seizures. This condition is often associated with perinatal asphyxia, which can occur due to factors such as placental abruption, umbilical cord prolapse, or maternal hypotension.
**Why Each Wrong Option is Incorrect**
**Option A:** Hypoglycemia is a cause of seizures in newborns, but it is not the most common cause. Hypoglycemia can lead to seizures by causing a shift in the balance of neurotransmitters, but it is more commonly seen in premature infants or those with underlying metabolic disorders.
**Option B:** Infection is a cause of seizures in newborns, particularly in cases of neonatal sepsis or meningitis. However, it is not the most common cause of seizures in this age group. Infection can lead to seizures by causing inflammation and damage to the brain tissue.
**Option C:** Metabolic disorders such as hypocalcemia or hypomagnesemia can cause seizures in newborns, but they are not the most common cause. These conditions can lead to seizures by disrupting normal neuronal function and excitability.
**Clinical Pearl / High-Yield Fact**
Newborns with seizures often have a poor prognosis, and early recognition and treatment are crucial to prevent long-term neurological damage. Hypoxic-ischemic encephalopathy is a leading cause of seizures in newborns, and prompt recognition and management of this condition can significantly improve outcomes.
**Correct Answer: A. Hypoxic-ischemic encephalopathy.**