TYK66 - Revision history

WikiSysop at 23:09, 23 January 2022

2022-01-23T23:09:54Z

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	When does pulmonary vascular resistance (PVR) in an infant reach adult values?		When does pulmonary vascular resistance (PVR) in an infant reach adult values?

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	E. 2 years		E. 2 years
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	==Answer==		==Answer==
	The answer is C. This is a tricky one. At delivery, there are mechanical and biochemical factors lead to the abrupt fall in PVR. The lungs expand which decrease the collapse of the intrapulmonary vessels. The rise in oxygen also causes release of potent vasodilators including nitric oxide and prostacyclin. This initial decrease is followed by remodeling that occurs over the next several months. The PVR has decreased to adult levels by 2 months of age and is at its nadir at 6 months of age.		The answer is C. This is a tricky one. At delivery, there are mechanical and biochemical factors lead to the abrupt fall in PVR. The lungs expand which decrease the collapse of the intrapulmonary vessels. The rise in oxygen also causes release of potent vasodilators including nitric oxide and prostacyclin. This initial decrease is followed by remodeling that occurs over the next several months. The PVR has decreased to adult levels by 2 months of age and is at its nadir at 6 months of age.



	==Notes==		==Notes==
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	==Keywords==		==Keywords==
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WikiSysop: 1 revision imported

2021-03-20T16:48:31Z

1 revision imported

← Older revision	Revision as of 16:48, 20 March 2021
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https://pedsanesthesia.net/wikiOLD032021>JustinHamrick at 12:25, 28 March 2015

2015-03-28T12:25:06Z

New page

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When does pulmonary vascular resistance (PVR) in an infant reach adult values?

A. 24 hours

B. 2 weeks

C. 2 months

D. 6 months

E. 2 years

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==Answer==
The answer is C. This is a tricky one. At delivery, there are mechanical and biochemical factors lead to the abrupt fall in PVR. The lungs expand which decrease the collapse of the intrapulmonary vessels. The rise in oxygen also causes release of potent vasodilators including nitric oxide and prostacyclin. This initial decrease is followed by remodeling that occurs over the next several months. The PVR has decreased to adult levels by 2 months of age and is at its nadir at 6 months of age.

==Notes==
<references />

==Keywords==
:

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