Use of bed cradle in the management of leg thrombosis is meant to:

Correct Answer: D

Rationale: The use of bed cradle in leg thrombosis management is to promote venous drainage. Elevating the legs on a bed cradle helps improve blood flow back to the heart, reducing swelling and preventing blood clots. Keeping the legs straight (A) is not the main purpose. Preventing embolism (B) is important but not the direct purpose of a bed cradle. Controlling body temperature (C) is unrelated to the use of a bed cradle for leg thrombosis.

Correct Answer: B

Rationale: The correct answer is B: Inadequate surfactant levels. Surfactant is a substance that reduces surface tension in the alveoli, preventing their collapse. In respiratory distress syndrome, premature infants have insufficient surfactant production, leading to collapsed alveoli and difficulty breathing. Choice A is incorrect because it focuses on quality rather than quantity of surfactant. Choice C is incorrect as rib cage underdevelopment is associated with congenital conditions like thoracic dystrophy, not RDS. Choice D is incorrect as gradual alveolar rupture is not a known cause of RDS.

Correct Answer: B

Rationale: The correct answer is B: Escherichia coli. Puerperal sepsis is often caused by endogenous bacteria from the mother's own flora. E. coli is a common endogenous bacteria found in the gastrointestinal tract and can cause infection during childbirth. Chlamydia trachomatis is a sexually transmitted infection, not typically associated with puerperal sepsis. Clostridium tetani causes tetanus, not puerperal sepsis. Pseudomonas aeruginosa is an environmental pathogen, not typically an endogenous cause of puerperal sepsis.

Correct Answer: B

Rationale: The Kleihauer-Betke acid-elution test is recommended in the management of hemolytic jaundice prenatally because it helps determine the amount of fetal-maternal hemorrhage, which is crucial for assessing the need for Rh immune globulin administration to prevent Rh sensitization in Rh-negative mothers carrying Rh-positive fetuses. This test helps quantify the amount of fetal red blood cells in the maternal circulation, guiding appropriate management to prevent hemolytic disease of the newborn. The other choices (A, C, D) do not specifically require the Kleihauer-Betke test for management and are not directly related to fetal-maternal hemorrhage assessment.

Correct Answer: D

Rationale: The correct answer is D: All neonates need vitamin K for activation of thrombokinase. Vitamin K is essential for the synthesis of clotting factors in the liver, including thrombokinase, which plays a crucial role in blood clotting. In neonates, there is a deficiency of vitamin K due to limited transfer across the placenta and low levels in breast milk. Administering vitamin K at birth helps prevent hemorrhagic disease of the newborn. Choices A, B, and C are incorrect because vitamin K does not directly impact immunity, prevent jaundice, or promote normal gut bacteria growth in neonates.