Atrial Septal Defect

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Most Common Type of ASD MCQ for NEET SS | mcqsurgery.com

Most common type of atrial septal defect (ASD) is:

Correct Answer

B) Ostium secundum

Explanation

Atrial septal defects are classified according to their anatomical location within the atrial septum.

  • Ostium secundum ASD:
    Located at the region of the fossa ovalis. It accounts for approximately 70–75% of all atrial septal defects, making it the most common type.
  • Ostium primum ASD:
    Less common. Typically associated with atrioventricular septal defects and endocardial cushion defects.
  • Sinus venosus ASD:
    Relatively rare. Commonly associated with partial anomalous pulmonary venous return.
  • Comparison:
    Since ostium secundum defects are far more frequent than other types, option (D) is incorrect.

Teaching Points

  • Ostium secundum ASD is the most common type (≈70–75%)
  • Located at the fossa ovalis
  • Ostium primum ASD is associated with AV canal defects
  • Sinus venosus ASD is commonly associated with anomalous pulmonary venous return
  • Fixed split S2 is a classic clinical finding in ASD
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Racoon Eye

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Q) Racoon eye is seen in 

a) Head injury

b) Sub galeal haematoma

c) Sub conjunctival haemorrhage

d) Nasal bone fracture

Answer free

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Q. The most common complication of Bevacizumab is
a) hypertension
b) Hyperglycemia
c) Rashes
d) Gastrointestinal perforations

Answer 

Whipple’s triad

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Q) Whipple's triad is seen in which pathological condition?

a) Insulinoma

b) Glucagonoma

c) VIPOma

d) Somatostatinoma

 

Answer 

a) Insulinoma

Whipple's triad is seen in pancreatic insulinoma and consists of 

a) Symptoms of hypoglycemia

b) Fasting sugar less than 50 mg%

c) Relief of symptoms with administration of dextrose solution

Other Points

  • Insulinoma is the most common functioning pancreatic neuroendocrine tumor
  • Symptoms are present for many years before diagnosis
  • Weight gain is common
  • Distribution of insulinomas is equal in body head and tail
  • Average size of insulinoma is 1-1.5 cm

Symptoms of Insulinoma

The neuroglycopenic symptoms of insulinoma included confusion, visual change, and unusual behavior

Sympathoadrenal symptoms may include palpitations, diaphoresis, and tremulousness.

Whipple's triad is just a part of Insulinoma and is not pathognomic of it. This entity may also be seen in other hyperinsulinemic conditions.

For endogenous Insulinoma, following tests are done

Proinsulin above 5.0 pmol/L

insulin above 3.0 pmol/L,

C-peptide above 0.2 nmol/L

all demonstrate endogenous hyperinsulinemia

In Memoriam: Allen O. Whipple, M.D

Choledochal cyst

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Q What is the management of choledochal cyst (bile duct cyst) adherent to portal vein?
a) Excision and Roux en y hepaticojejunostomy
b) Internal drainage into roux en y jejunal limb
c) Hepatic lobectomy
d) The internal lining of the cyst can be excised, leaving the  external portion of the cyst wall intact.