Aortic regurgitation physical examination: Difference between revisions

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{| class="infobox" style="float:right;"
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| [[File:Siren.gif|30px|link=Aortic regurgitation resident survival guide]]|| <br> || <br>
| [[Aortic regurgitation resident survival guide|'''Resident'''<br>'''Survival'''<br>'''Guide''']]
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{{Infobox disease
| Name            = Aortic insufficiency
| Image          = aortic_regurgitation.jpg|
}}
{{Aortic insufficiency}}
{{Aortic insufficiency}}
{{CMG}}; {{AE}} {{CZ}}; {{VK}}; {{LG}}; {{USAMA}}


{{CMG}}; {{AOEIC}}; {{CZ}}; {{VK}}; {{LG}}
==Overview==
Acute aortic regurgitation (AR) is characterized by the presence of a low pitched early diastolic murmur that is best heard at the right 2nd intercostal space, decreased or absent S1, and increased P2.  Chronic AR is characterized by the presence of a high pitched holodiastolic decrescendo murmur that is best heard at the upper left sternal border and that increases with sitting forward, expiration, and handgrip. In chronic AR, a wide pulse pressure (≥ 60 mmHg), a [[S3]], and [[Corrigan's pulse]] might be present.  An [[Systolic murmur|ejection systolic 'flow' murmur]] may also be present. The [[apex beat]] is typically displaced down and to the left. A patient with chronic AR may present with signs of [[congestive heart failure|congestive heart failure.]]<ref>Enriquez-Sarano M, Tajik AJ. Clinical practice. Aortic regurgitation. N Engl J Med 2004; 351:1539</ref><ref name="pmid8629648">{{cite journal| author=Desjardins VA, Enriquez-Sarano M, Tajik AJ, Bailey KR, Seward JB| title=Intensity of murmurs correlates with severity of valvular regurgitation. | journal=Am J Med | year= 1996 | volume= 100 | issue= 2 | pages= 149-56 | pmid=8629648 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=8629648  }} </ref><ref name="pmid11498061">{{cite journal| author=Tribouilloy CM, Enriquez-Sarano M, Mohty D, Horn RA, Bailey KR, Seward JB et al.| title=Pathophysiologic determinants of third heart sounds: a prospective clinical and Doppler echocardiographic study. | journal=Am J Med | year= 2001 | volume= 111 | issue= 2 | pages= 96-102 | pmid=11498061 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=11498061  }} </ref>


==Overview==
==Physical Examination==
Upon physical examination, a patient with suspected aortic insufficiency may have early diastolic heart murmur and S3 gallop correlates with development of left ventricular dysfunction. An ejection systolic 'flow' murmur may also be present. The apex beat is typically displaced down and to the left. A patient with chronic aortic insufficiency may present with signs of [[congestive heart failure]].
===Vital Signs===
The following variations can be seen in Aortic Regurgitation.The following signs can be noticed in patients with Aortic Regurgitation.<ref name="pmid12729428">{{cite journal| author=Babu AN, Kymes SM, Carpenter Fryer SM| title=Eponyms and the diagnosis of aortic regurgitation: what says the evidence? | journal=Ann Intern Med | year= 2003 | volume= 138 | issue= 9 | pages= 736-42 | pmid=12729428 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=12729428  }} </ref><ref name="pmid3963660">{{cite journal| author=Grayburn PA, Smith MD, Handshoe R, Friedman BJ, DeMaria AN| title=Detection of aortic insufficiency by standard echocardiography, pulsed Doppler echocardiography, and auscultation. A comparison of accuracies. | journal=Ann Intern Med | year= 1986 | volume= 104 | issue= 5 | pages= 599-605 | pmid=3963660 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=3963660  }} </ref><ref name="pmid14325909">{{cite journal| author=FRANK MJ, CASANEGRA P, MIGLIORI AJ, LEVINSON GE| title=THE CLINICAL EVALUATION OF AORTIC REGURGITATION, WITH SPECIAL REFERENCE TO A NEGLECTED SIGN: THE POPLITEAL-BRACHIAL PRESSURE GRADIENT. | journal=Arch Intern Med | year= 1965 | volume= 116 | issue=  | pages= 357-65 | pmid=14325909 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=14325909  }} </ref>
 
====Pulse and Blood Pressure====
*In acute aortic insufficiency, there may be a [[wide pulse pressure]] intitally. As the [[left ventricle]] fails, the [[pulse pressure]] narrows (the [[left ventricular end diastolic pressure]] rises to equal the [[diastolic blood pressure]]). [[Stroke volume]] of the [[left ventricle]] declines reducing the [[systolic blood pressure]]. In some cases, the sharply rising [[left ventricular end diastolic pressure]] causes the [[mitral valve]] to close earlier during [[diastole]]. This early closure prevents backward flow of [[blood]] into the pulmonary vascular bed and often keeps the aortic diastolic pressure from falling too low. Sometimes there may not be a [[wide pulse pressure]].
 
*In chronic aortic insufficiency, there is often a [[wide pulse pressure]] during the early compensatory period. The [[diastolic blood pressure]] is often < 60 mmHg and the [[pulse pressure]] often exceeds 100 mmHg. In younger patients the vasculature is more compliant, and the [[pulse pressure]] may not be as wide.


==Vital Signs==
===Wide Pulse Pressure===
*In acute aortic insufficiency, there may initially be a [[wide pulse pressure]], but as the left ventricle fails, the [[pulse pressure]] may narrow as the [[left ventricular end diastolic pressure]] rises to equal the diastolic blood pressure, and [[stroke volume]] of the left ventricle declines reducing the systolic blood pressure. In some cases, the sharply rising left ventricular end diastolic pressure causes the [[mitral valve]] to close earlier during [[diastole]].  This early closure fortunately prevents backward flow of blood into the pulmonary vascular bed and often keeps the aortic diastolic pressure from falling too low and sometimes there may not be a wide [[pulse pressure]].
*In chronic AI, there is often a [[wide pulse pressure]] during the early compensatory period. The diastolic blood pressure is often < 60 mm Hg, and the [[pulse pressure]] often exceeds 100 mm Hg.  In younger patients the vasculature is more compliant, and the pulse pressure may not be as wide.
===Bounding Pulse===
*Bounding peripheral pulses (known as [[Watson's water hammer pulse]]) may be present.
*Bounding peripheral pulses (known as [[Watson's water hammer pulse]]) may be present.


===Tachycardia===
*There is often a compensatory [[tachycardia]] to compensate for the reduced [[stroke volume]].
There is often a compensatory tachycardia to compensate for the reduced [[stroke volume]].


==Head and Neck==
===Head and Neck===
*[[de Musset sign]]: Bobbing of the head with each heartbeat may be present.
*[[Lighthouse sign]]: Blanching and flushing of the forehead may be present.
*[[Corrigan's pulse]]: A rapid upstroke and collapse of the [[carotid artery]] pulse may be present.
{{#ev:youtube|C6mTmpP9Lvw}}


==Eyes==
*[[De Musset sign]]: Bobbing of the [[head]] with each heartbeat may be present.
*[[Lighthouse sign]]: [[Blanching]] and [[flushing]] of the forehead may be present.
*[[Corrigan's pulse]]: A rapid upstroke and collapse of the [[carotid artery]] [[pulse]] may be present.
{{#ev:youtube|rh7_MnjrOAY}}
 
===Eyes===
*[[Becker sign]]: Systolic pulsations of the [[retinal arteries]] may be present.
*[[Becker sign]]: Systolic pulsations of the [[retinal arteries]] may be present.
*[[Ashrafian sign]]: Pulsatile pseudo-proptosis may be present.<ref name="pmid16503268">{{cite journal |author=Ashrafian H |title=Pulsatile pseudo-proptosis, aortic regurgitation and 31 eponyms |journal=[[International Journal of Cardiology]] |volume=107 |issue=3 |pages=421–3 |year=2006 |month=March |pmid=16503268 |doi=10.1016/j.ijcard.2005.01.060 |url=http://linkinghub.elsevier.com/retrieve/pii/S0167-5273(05)00451-1 |accessdate=2012-04-15}}</ref>
*[[Ashrafian sign]]: Pulsatile pseudo-[[proptosis]] may be present.<ref name="pmid16503268">{{cite journal |author=Ashrafian H |title=Pulsatile pseudo-proptosis, aortic regurgitation and 31 eponyms |journal=[[International Journal of Cardiology]] |volume=107 |issue=3 |pages=421–3 |year=2006 |month=March |pmid=16503268 |doi=10.1016/j.ijcard.2005.01.060 |url=http://linkinghub.elsevier.com/retrieve/pii/S0167-5273(05)00451-1 |accessdate=2012-04-15}}</ref>
*[[Landolfi's sign]] Alternating constriction and dilatation of the [[pupil]] may be present.
*[[Landolfi's sign]]: Alternating constriction and dilatation of the [[pupil]]s may be present.


==Throat==
===Throat===
*[[Müller's sign]]: Systolic pulsations of the [[uvula]] may be present.<ref name="pmid16855259">{{cite journal |author=Williams BR, Steinberg JP |title=Images in clinical medicine. Müller's sign |journal=[[The New England Journal of Medicine]] |volume=355 |issue=3 |pages=e3 |year=2006 |month=July |pmid=16855259 |doi=10.1056/NEJMicm050642 |url=http://dx.doi.org/10.1056/NEJMicm050642 |accessdate=2012-04-15}}</ref>
*[[Müller's sign]]: Systolic pulsations of the [[uvula]] may be present.<ref name="pmid16855259">{{cite journal |author=Williams BR, Steinberg JP |title=Images in clinical medicine. Müller's sign |journal=[[The New England Journal of Medicine]] |volume=355 |issue=3 |pages=e3 |year=2006 |month=July |pmid=16855259 |doi=10.1056/NEJMicm050642 |url=http://dx.doi.org/10.1056/NEJMicm050642 |accessdate=2012-04-15}}</ref>
{{#ev:youtube|HLMqkHZ-Mvo}}
{{#ev:youtube|HLMqkHZ-Mvo}}


==Heart==
===Heart===
===I. Palpation:===
====Palpation====
=====Apical Impulse:=====
*[[Apical impulse]]:
:The [[point of maximal impulse]] is diffuse and hyperdynamic. The [[apical impulse]] is displaced laterally and inferiorly.
:*The [[point of maximal impulse]] is diffuse and hyperdynamic. The [[apical impulse]] is displaced laterally and inferiorly.
*[[Thrill|Systolic thrill]]:
:*[[Thrill|Systolic thrill]] (palpable ventricular filling wave) is felt at the [[apex]] and at the [[base]] of the [[heart]].


=====Systolic Thrill:=====
====Auscultation====
:[[Thrill|Systolic thrill]] (palpable ventricular filling wave) is felt at the [[apex]] and at the [[base]] of the heart.
=====Heart Sounds=====
 
===II. Auscultation:===
=====Heart sounds:=====
:*An [[S3]] [[gallop]] is present if [[left ventricular dysfunction]] is present.
:*An [[S3]] [[gallop]] is present if [[left ventricular dysfunction]] is present.
:*An [[S4]] may be present consistent with impaired [[left ventricular]] filling against a [[LVH|hypertrophied left ventricular wall]]
:*An [[S4]] may be present consistent with impaired [[left ventricular]] filling against a [[LVH|hypertrophied left ventricular wall]].
 
=====Murmurs=====
=====Chronic AR Murmurs:=====
*An early diastolic, low pitched, decrescendo murmur in acute AR vs high pitched holodiastolic decrescendo murmur in chromic AR.
:*'''''An early early diastolic decrescendo murmur''''' is present
:*Position: Patient seated and leans forward with breath held in expiration.
::*Position: Patient seated and leans forward with breath held in expiration
:*Best heard at the aortic area with the diaphragm.
::*Quality: Soft [[early diastolic and decrescendo]]
:*Radiate to the right parasternal region ([[ascending aortic aneurysm]] should be excluded).
::*Best heard: at aortic area with the diaphragm  
<div align="left">
::*Radiation: to the right parasternal region ([[ascending aortic aneurysm]] should be excluded)
<gallery heights="145" widths="375">
image:Early diastolic.jpg|Early diastolic murmur: [[Aortic Insufficiency]]
Image:AI Left Sternal Border.jpg|Smooth A<sub>2</sub> and early diastolic murmur: [[Aortic Insufficiency]]
</gallery>
</div>
{{clr}}
{{#ev:youtube|shLGJi8dVQ8}}


:*'''''Ejection systolic flow murmur:'''''
*Ejection systolic flow murmur:
::*Best heard: at aortic area (only a concomitant [[aortic stenosis]] causes murmur with an ejection click)
:*Best heard at the aortic area (only a concomitant [[aortic stenosis]] causes [[murmur]] with an ejection click).
::*Heard in cases of increased [[stroke volume]] due to left ventricular [[volume overload]]
:*Heard in cases of increased [[stroke volume]] due to left ventricular volume overload.
{{#ev:youtube|IfJotUSNgdo}}
{{#ev:youtube|IfJotUSNgdo}}


:*'''''Austin Flint murmur:'''''
*[[Austin Flint murmur]]:
::*Quality: soft mid-diastolic rumble
:*Quality: Soft mid-diastolic rumble
::*Best heard at the cardiac apex.
:*Best heard at the cardiac apex
::*The regurgitant jet from the severe aortic regurgitation renders partial closure of the anterior mitral leaflet causing [[Austin Flint murmur]].
:*Anterior [[mitral valve]] leaflet hit by regurgitant [[blood flow]] from the severe aortic regurgitation results in partial closure of the mitral leaflets causing [[Austin Flint murmur]].
{{#ev:youtube|y5CcncRHl38}}
{{#ev:youtube|y5CcncRHl38}}


==Lungs==
===Lungs===
*[[Pulmonary edema]] and [[rales]] may be present
*[[Pulmonary edema]] and [[rales]] may be present.


==Abdomen==
===Abdomen===
*[[Rosenbach's sign]]: Pulsatile [[liver]].
*[[Rosenbach's sign]]: Systolic Pulsations of [[liver]] may be present.
*[[Gerhardt's sign]]: Enlarged pulsatile [[spleen]].
*[[Gerhardt's sign]]: Systolic pulsations of [[spleen]] may be present.


==Peripheral Examination==
===Extremities===
===Upper Extremities===
*Upper extremities:
*[[Mayen's sign]]: Diastolic drop of > 15 mm Hg with the arm raised.
:*[[Mayen's sign]]: Diastolic drop of > 15 mmHg with the arm raised.
*[[Quincke's sign]]: Pulsation of the capillary bed in the nail.
:*[[Quincke's sign]]: Pulsation of the [[capillary]] bed in the nail.
{{#ev:youtube|S5iEMu_9Wu8}}
{{#ev:youtube|9m_0RAQDFHM}}


===Lower Extremities===
*Lower extremities:
*[[Traube's sign]]: systolic and diastolic murmurs described as 'pistol shots' heard over the [[femoral artery]] when it is gradually compressed.
:*[[Traube's sign]]: Systolic and diastolic murmurs described as 'pistol shots' heard over the [[femoral artery]] when it is gradually compressed.
*[[Duroziez's sign]]: a double sound heard over the [[femoral artery]] when it is compressed distally.
:*[[Duroziez's sign]]: Systolic and diastolic murmurs heard over the [[femoral artery]] with proximal or distal compression of the [[femoral artery]] respectively.
*[[Lincoln's sign]]: A pulsatile popliteal pulse.
:*[[Lincoln's sign]]: A pulsatile [[Popliteal artery|popliteal]] pulse.
*[[Hill's sign]]: A ≥ 20 mmHg difference in popliteal and brachial systolic cuff pressures, seen in chronic severe AR. Considered to be an artefact of sphygmomanometric lower limb pressure measurement<ref>{{cite journal |author=Kutryk M, Fitchett D |title=Hill's sign in aortic regurgitation: enhanced pressure wave transmission or artefact? |journal=The Canadian journal of cardiology |volume=13 |issue=3 |pages=237–40 |year=1997 |pmid=9117911 |doi=}}</ref>.
:*[[Hill's sign]]: A ≥ 20 mmHg difference in popliteal and brachial systolic cuff pressures, seen in chronic severe AR. Considered to be an artifact of sphygmomanometric lower limb pressure measurement.<ref>{{cite journal |author=Kutryk M, Fitchett D |title=Hill's sign in aortic regurgitation: enhanced pressure wave transmission or artefact? |journal=The Canadian journal of cardiology |volume=13 |issue=3 |pages=237–40 |year=1997 |pmid=9117911 |doi=}}</ref>
*[[Sherman's sign]]: The [[dorsalis pedis pulse]] is located quickly and is unexpectedly prominent in a patient over 75 years of age.
:*[[Sherman's sign]]: The [[dorsalis pedis pulse]] is located quickly and is unexpectedly prominent in a patient over 75 years of age.


==Underlying Causes of Aortic Insufficiency to Be Cognizant of During the Physical Examination==
==Underlying Causes of Aortic Insufficiency to be Cognizant of During the Physical Examination==
During the physical exam, you should be looking for signs that would indicate the underlying cause of aortic insufficiency including signs of:
During the physical exam, you should be looking for signs that would indicate the underlying cause of aortic insufficiency including signs of:<ref name="pmid24603191">{{cite journal| author=Nishimura RA, Otto CM, Bonow RO, Carabello BA, Erwin JP, Guyton RA et al.| title=2014 AHA/ACC guideline for the management of patients with valvular heart disease: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines. | journal=J Am Coll Cardiol | year= 2014 | volume= 63 | issue= 22 | pages= e57-185 | pmid=24603191 | doi=10.1016/j.jacc.2014.02.536 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24603191  }} </ref><ref name="pmid15172299">{{cite journal |author=Onorati F, De Santo LS, Carozza A, De Feo M, Renzulli A, Cotrufo M |title=Marfan syndrome as a predisposing factor for traumatic aortic insufficiency |journal=[[The Annals of Thoracic Surgery]] |volume=77 |issue=6 |pages=2192–4 |year=2004 |month=June |pmid=15172299 |doi=10.1016/S0003-4975(03)01409-7 |url=http://linkinghub.elsevier.com/retrieve/pii/S0003497503014097 |accessdate=2011-03-28}}</ref>
*[[Endocarditis signs and physical examination|Infective endocarditis]]
*[[Endocarditis signs and physical examination|Infective endocarditis]]
*[[Marfan syndrome]]
*[[Marfan syndrome]]
Line 91: Line 108:
==References==
==References==
{{reflist|2}}
{{reflist|2}}
{{WH}}
{{WH}}
{{WS}}
{{WS}}
[[CME Category::Cardiology]]
[[Category:Disease]]
[[Category:Cardiology]]
[[Category:Valvular heart disease]]
[[Category:Congenital heart disease]]
[[Category:Surgery]]
[[Category:Cardiac surgery]]
[[Category:Emergency medicine]]
[[Category:Intensive care medicine]]
[[Category:Up-To-Date cardiology]]
[[Category:Up-To-Date]]

Revision as of 15:22, 5 January 2017
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Cafer Zorkun, M.D., Ph.D. [2]; Varun Kumar, M.B.B.S. [3]; Lakshmi Gopalakrishnan, M.B.B.S. [4]; Usama Talib, BSc, MD [5]

Overview

Acute aortic regurgitation (AR) is characterized by the presence of a low pitched early diastolic murmur that is best heard at the right 2nd intercostal space, decreased or absent S1, and increased P2. Chronic AR is characterized by the presence of a high pitched holodiastolic decrescendo murmur that is best heard at the upper left sternal border and that increases with sitting forward, expiration, and handgrip. In chronic AR, a wide pulse pressure (≥ 60 mmHg), a S3, and Corrigan's pulse might be present. An ejection systolic 'flow' murmur may also be present. The apex beat is typically displaced down and to the left. A patient with chronic AR may present with signs of congestive heart failure.[1][2][3]

Physical Examination

Vital Signs

The following variations can be seen in Aortic Regurgitation.The following signs can be noticed in patients with Aortic Regurgitation.[4][5][6]

Pulse and Blood Pressure

Head and Neck

{{#ev:youtube|rh7_MnjrOAY}}

Eyes

Throat

{{#ev:youtube|HLMqkHZ-Mvo}}

Heart

Palpation

Auscultation

Heart Sounds
Murmurs
  • An early diastolic, low pitched, decrescendo murmur in acute AR vs high pitched holodiastolic decrescendo murmur in chromic AR.
  • Position: Patient seated and leans forward with breath held in expiration.
  • Best heard at the aortic area with the diaphragm.
  • Radiate to the right parasternal region (ascending aortic aneurysm should be excluded).

{{#ev:youtube|shLGJi8dVQ8}}

  • Ejection systolic flow murmur:
  • Best heard at the aortic area (only a concomitant aortic stenosis causes murmur with an ejection click).
  • Heard in cases of increased stroke volume due to left ventricular volume overload.

{{#ev:youtube|IfJotUSNgdo}}

  • Quality: Soft mid-diastolic rumble
  • Best heard at the cardiac apex
  • Anterior mitral valve leaflet hit by regurgitant blood flow from the severe aortic regurgitation results in partial closure of the mitral leaflets causing Austin Flint murmur.

{{#ev:youtube|y5CcncRHl38}}

Lungs

Abdomen

Extremities

  • Upper extremities:

{{#ev:youtube|9m_0RAQDFHM}}

  • Lower extremities:

Underlying Causes of Aortic Insufficiency to be Cognizant of During the Physical Examination

During the physical exam, you should be looking for signs that would indicate the underlying cause of aortic insufficiency including signs of:[10][11]

References

  1. ↑ Enriquez-Sarano M, Tajik AJ. Clinical practice. Aortic regurgitation. N Engl J Med 2004; 351:1539
  2. ↑ Desjardins VA, Enriquez-Sarano M, Tajik AJ, Bailey KR, Seward JB (1996). "Intensity of murmurs correlates with severity of valvular regurgitation". Am J Med. 100 (2): 149–56. PMID 8629648.
  3. ↑ Tribouilloy CM, Enriquez-Sarano M, Mohty D, Horn RA, Bailey KR, Seward JB; et al. (2001). "Pathophysiologic determinants of third heart sounds: a prospective clinical and Doppler echocardiographic study". Am J Med. 111 (2): 96–102. PMID 11498061.
  4. ↑ Babu AN, Kymes SM, Carpenter Fryer SM (2003). "Eponyms and the diagnosis of aortic regurgitation: what says the evidence?". Ann Intern Med. 138 (9): 736–42. PMID 12729428.
  5. ↑ Grayburn PA, Smith MD, Handshoe R, Friedman BJ, DeMaria AN (1986). "Detection of aortic insufficiency by standard echocardiography, pulsed Doppler echocardiography, and auscultation. A comparison of accuracies". Ann Intern Med. 104 (5): 599–605. PMID 3963660.
  6. ↑ FRANK MJ, CASANEGRA P, MIGLIORI AJ, LEVINSON GE (1965). "THE CLINICAL EVALUATION OF AORTIC REGURGITATION, WITH SPECIAL REFERENCE TO A NEGLECTED SIGN: THE POPLITEAL-BRACHIAL PRESSURE GRADIENT". Arch Intern Med. 116: 357–65. PMID 14325909.
  7. ↑ Ashrafian H (2006). "Pulsatile pseudo-proptosis, aortic regurgitation and 31 eponyms". International Journal of Cardiology. 107 (3): 421–3. doi:10.1016/j.ijcard.2005.01.060. PMID 16503268. Retrieved 2012-04-15. Unknown parameter |month= ignored (help)
  8. ↑ Williams BR, Steinberg JP (2006). "Images in clinical medicine. Müller's sign". The New England Journal of Medicine. 355 (3): e3. doi:10.1056/NEJMicm050642. PMID 16855259. Retrieved 2012-04-15. Unknown parameter |month= ignored (help)
  9. ↑ Kutryk M, Fitchett D (1997). "Hill's sign in aortic regurgitation: enhanced pressure wave transmission or artefact?". The Canadian journal of cardiology. 13 (3): 237–40. PMID 9117911.
  10. ↑ Nishimura RA, Otto CM, Bonow RO, Carabello BA, Erwin JP, Guyton RA; et al. (2014). "2014 AHA/ACC guideline for the management of patients with valvular heart disease: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines". J Am Coll Cardiol. 63 (22): e57–185. doi:10.1016/j.jacc.2014.02.536. PMID 24603191.
  11. ↑ Onorati F, De Santo LS, Carozza A, De Feo M, Renzulli A, Cotrufo M (2004). "Marfan syndrome as a predisposing factor for traumatic aortic insufficiency". The Annals of Thoracic Surgery. 77 (6): 2192–4. doi:10.1016/S0003-4975(03)01409-7. PMID 15172299. Retrieved 2011-03-28. Unknown parameter |month= ignored (help)

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