WBR0883: Difference between revisions
Jump to navigation
Jump to search
Sergekorjian (talk | contribs) No edit summary |
Sergekorjian (talk | contribs) No edit summary |
||
| Line 23: | Line 23: | ||
|Prompt=A 38 year old woman is undergoing work-up for idiopathic pulmonary hypertension. During pulmonary artery catheterization her cardiologist takes the measurements shown below. What is this patient's estimated cardiac output? <br> | |Prompt=A 38 year old woman is undergoing work-up for idiopathic pulmonary hypertension. During pulmonary artery catheterization her cardiologist takes the measurements shown below. What is this patient's estimated cardiac output? <br> | ||
''Pulmonary capillary wedge pressure'' = 9 mmHg<br> | |||
''Right atrial pressure'' = 3 mmHg<br> | |||
''Pulmonary artery pressure'' = 23 mmHg<br> | |||
''AV CO<sub>2</sub> difference'' = 28 ml/m<sup>2</sup><br> | |||
''AV O<sub>2</sub> difference'' = 36 ml/m<sup>2</sup><br> | |||
''Rate of O<sub>2</sub> consumption'' = 190 ml/min/m<sup>2</sup> | |||
|Explanation=Fick's principle is a simple way to calculate cardiac output by using the arteriovenous oxygen difference and rate of oxygen consumption that can be measured during right heart catheterization (pulmonary artery cathterization). The equation used is shown below: | |Explanation=Fick's principle is a simple way to calculate cardiac output by using the arteriovenous oxygen difference and rate of oxygen consumption that can be measured during right heart catheterization (pulmonary artery cathterization). The equation used is shown below: | ||
[[Image:Fick's_principle.png| | [[Image:Fick's_principle.png|650px]] | ||
|AnswerA=8.26 | |AnswerA=8.26 | ||
|AnswerAExp=Incorrect | |AnswerAExp=Incorrect | ||
| Line 50: | Line 44: | ||
|AnswerE=5.28 | |AnswerE=5.28 | ||
|AnswerEExp=Correct | |AnswerEExp=Correct | ||
|EducationalObjectives=[[Image:Fick's_principle.png|500px]] | |||
|References=Grossman J, Weston RE, Leiter L. A method for determining cardiac output by the direct fick principle without gas analysis. J Clin Invest. 1953;32(2):161-71. | |||
|RightAnswer=E | |RightAnswer=E | ||
|WBRKeyword=Fick's principle, Cardiac output, oxygen consumption, right heart catheterization, pulmonary artery cathterization | |WBRKeyword=Fick's principle, Cardiac output, oxygen consumption, right heart catheterization, pulmonary artery cathterization | ||
|Approved=Yes | |Approved=Yes | ||
}} | }} | ||
Revision as of 23:38, 6 March 2015
| Author | [[PageAuthor::Serge Korjian M.D. (Reviewed by Serge Korjian)]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Physiology |
| Sub Category | SubCategory::Cardiology |
| Prompt | [[Prompt::A 38 year old woman is undergoing work-up for idiopathic pulmonary hypertension. During pulmonary artery catheterization her cardiologist takes the measurements shown below. What is this patient's estimated cardiac output? Pulmonary capillary wedge pressure = 9 mmHg |
| Answer A | AnswerA::8.26 |
| Answer A Explanation | AnswerAExp::Incorrect |
| Answer B | AnswerB::7.66 |
| Answer B Explanation | AnswerBExp::Incorrect |
| Answer C | AnswerC::7.03 |
| Answer C Explanation | AnswerCExp::Incorrect |
| Answer D | AnswerD::6.78 |
| Answer D Explanation | AnswerDExp::Incorrect |
| Answer E | AnswerE::5.28 |
| Answer E Explanation | AnswerEExp::Correct |
| Right Answer | RightAnswer::E |
| Explanation | [[Explanation::Fick's principle is a simple way to calculate cardiac output by using the arteriovenous oxygen difference and rate of oxygen consumption that can be measured during right heart catheterization (pulmonary artery cathterization). The equation used is shown below:
|
| Approved | Approved::Yes |
| Keyword | WBRKeyword::Fick's principle, WBRKeyword::Cardiac output, WBRKeyword::oxygen consumption, WBRKeyword::right heart catheterization, WBRKeyword::pulmonary artery cathterization |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |
