Heart murmur pathophysiology: Difference between revisions

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===summery of pathophysiology===
==Summery of pathophysiology for few causes of heart murmur ==
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|[[aortic regurgitation]]
|[[aortic regurgitation]]
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* [[Aortic regurgitation|Aortic insufficiency]] develop when the pressure in the [[left ventricle]] falls below the pressure in the [[aorta]],leading to volume overload of the [[left ventricle]].<ref name="pmid24939033">{{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 Thorac Cardiovasc Surg | year= 2014 | volume= 148 | issue= 1 | pages= e1-e132 | pmid=24939033 | doi=10.1016/j.jtcvs.2014.05.014 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24939033  }} </ref> <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>
*[[Aortic regurgitation|Aortic insufficiency]] develop when the pressure in the [[left ventricle]] falls below the pressure in the [[aorta]],leading to volume overload of the [[left ventricle]].<ref name="pmid24939033">{{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 Thorac Cardiovasc Surg | year= 2014 | volume= 148 | issue= 1 | pages= e1-e132 | pmid=24939033 | doi=10.1016/j.jtcvs.2014.05.014 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=24939033  }} </ref> <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>
* In acute [[Aortic regurgitation|aortic insufficiency]]:
*In acute [[Aortic regurgitation|aortic insufficiency]]:
** Sudden decrease in [[stroke volume]] and increase in left ventricular end diastolic volume causing decrease [[cardiac output]] and reflex [[tachycardia]], which eventually lead to profound [[hypotension]] and [[cardiogenic shock]].  
**Sudden decrease in [[stroke volume]] and increase in left ventricular end diastolic volume causing decrease [[cardiac output]] and reflex [[tachycardia]], which eventually lead to profound [[hypotension]] and [[cardiogenic shock]].
** [[pulmonary edema]] develops in severe cases due to the rapidly rising in the left ventricular end diastolic pressure which equalizes with the aortic end-diastolic pressure leading to back flow of [[blood]].<ref name="pmid19564568">{{cite journal| author=Stout KK, Verrier ED| title=Acute valvular regurgitation. | journal=Circulation | year= 2009 | volume= 119 | issue= 25 | pages= 3232-41 | pmid=19564568 | doi=10.1161/CIRCULATIONAHA.108.782292 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19564568  }} </ref><ref name="pmid21423463">{{cite journal| author=Mokadam NA, Stout KK, Verrier ED| title=Management of acute regurgitation in left-sided cardiac valves. | journal=Tex Heart Inst J | year= 2011 | volume= 38 | issue= 1 | pages= 9-19 | pmid=21423463 | doi= | pmc=3060740 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21423463  }} </ref>
**[[pulmonary edema]] develops in severe cases due to the rapidly rising in the left ventricular end diastolic pressure which equalizes with the aortic end-diastolic pressure leading to back flow of [[blood]].<ref name="pmid19564568">{{cite journal| author=Stout KK, Verrier ED| title=Acute valvular regurgitation. | journal=Circulation | year= 2009 | volume= 119 | issue= 25 | pages= 3232-41 | pmid=19564568 | doi=10.1161/CIRCULATIONAHA.108.782292 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=19564568  }} </ref><ref name="pmid21423463">{{cite journal| author=Mokadam NA, Stout KK, Verrier ED| title=Management of acute regurgitation in left-sided cardiac valves. | journal=Tex Heart Inst J | year= 2011 | volume= 38 | issue= 1 | pages= 9-19 | pmid=21423463 | doi= | pmc=3060740 | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=21423463  }} </ref>


* In [[Aortic insufficiency|chronic aortic insufficiency]]:
*In [[Aortic insufficiency|chronic aortic insufficiency]]:
** there is compensation for increased left ventricular end diastolic volume by progressive left ventricular dilatation and [[left ventricular hypertrophy]], which maintains normal wall stress.
**there is compensation for increased left ventricular end diastolic volume by progressive left ventricular dilatation and [[left ventricular hypertrophy]], which maintains normal wall stress.
** Overtime, when the [[left ventricular hypertrophy]] fails to keep up with chronic volume overload, the [[left ventricle]] decompensate causing reduction in the left ventricular wall compliance with resultant [[congestive heart failure]].<ref name="pmid15470217">{{cite journal| author=Enriquez-Sarano M, Tajik AJ| title=Clinical practice. Aortic regurgitation. | journal=N Engl J Med | year= 2004 | volume= 351 | issue= 15 | pages= 1539-46 | pmid=15470217 | doi=10.1056/NEJMcp030912 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15470217  }} </ref><ref name="pmid10051296">{{cite journal| author=Devlin WH, Petrusha J, Briesmiester K, Montgomery D, Starling MR| title=Impact of vascular adaptation to chronic aortic regurgitation on left ventricular performance. | journal=Circulation | year= 1999 | volume= 99 | issue= 8 | pages= 1027-33 | pmid=10051296 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10051296  }} </ref> <ref name="Nishimura-2002">{{Cite journal  | last1 = Nishimura | first1 = RA. | title = Cardiology patient pages. Aortic valve disease. | journal = Circulation | volume = 106 | issue = 7 | pages = 770-2 | month = Aug | year = 2002 | doi =  | PMID = 12176943 }}</ref>
**Overtime, when the [[left ventricular hypertrophy]] fails to keep up with chronic volume overload, the [[left ventricle]] decompensate causing reduction in the left ventricular wall compliance with resultant [[congestive heart failure]].<ref name="pmid15470217">{{cite journal| author=Enriquez-Sarano M, Tajik AJ| title=Clinical practice. Aortic regurgitation. | journal=N Engl J Med | year= 2004 | volume= 351 | issue= 15 | pages= 1539-46 | pmid=15470217 | doi=10.1056/NEJMcp030912 | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=15470217  }} </ref><ref name="pmid10051296">{{cite journal| author=Devlin WH, Petrusha J, Briesmiester K, Montgomery D, Starling MR| title=Impact of vascular adaptation to chronic aortic regurgitation on left ventricular performance. | journal=Circulation | year= 1999 | volume= 99 | issue= 8 | pages= 1027-33 | pmid=10051296 | doi= | pmc= | url=https://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=10051296  }} </ref> <ref name="Nishimura-2002">{{Cite journal  | last1 = Nishimura | first1 = RA. | title = Cardiology patient pages. Aortic valve disease. | journal = Circulation | volume = 106 | issue = 7 | pages = 770-2 | month = Aug | year = 2002 | doi =  | PMID = 12176943 }}</ref>
|-
|-
|[[mitral stenosis]]
|[[mitral stenosis]]

Revision as of 18:11, 28 January 2021

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1], Associate Editor(s)-in-Chief: Nuha Al-Howthi, MD[2]

Overview

Turbulent flow is responsible for most murmurs. Turbulent flow occurs when the velocity of blood flow becomes critically high because of a high volume of flow, the flow goes through an irregular or narrow area, the flow empties into a dilated vessel or chamber, or if the flow goes backward through an incompetent valve, septal defect, or patent ductus arteriosus. Frequently, a combination of these factors is operative. The sounds most commonly originate from the abnormal movement of blood across valves and between cardiac chambers. When this occurs, turbulence results, which produces vibrations in the chambers of the heart or outflow vessels that are detected as Murmurs.


Summery of pathophysiology for few causes of heart murmur

pathophysiology
aortic stenosis
Pathophysiology of aortic stenosis
Pathophysiology of aortic stenosis
aortic regurgitation
mitral stenosis
  • Mitral stenosis (MS) is most commonly secondary to acute rheumatic fever. Generally, the initial valvulitis is associated with valvular regurgitation then over the years, the commissures fuse and the valves thicken and calcify.[12]
  • Usually, the rate of decrement in the valve area is about 0.1 cm2/year once mitral stenosis is present.[13][14]
  • When the cross sectional area is about 2 cm2 called Mild Mitral Stenosis.[15]
  • When the cross sectional area goes below 2 cm2:
    • there will be impediment to the flow of blood into the left ventricle, creating a pressure gradient that increased by increases in the heart rate or cardiac output.
    • The atrial kick is required to fill the left ventricle with blood when the valve is so tight and the gradient is so high.
    • When the heart rate goes above a certain point, the diastolic filling period is insufficient to fill the ventricle with blood and pressure builds up in the left atrium, leading to pulmonary congestion.[16]
  • When the mitral valve area goes less than 1 cm2:
mitral regurgitation

References

  1. ↑ Galli D, Manuguerra R, Monaco R, Manotti L, Goldoni M, Becchi G; et al. (2016). "Understanding the structural features of symptomatic calcific aortic valve stenosis: A broad-spectrum clinicopathologic study in 236 consecutive surgical cases". Int J Cardiol. 228: 364–374. doi:10.1016/j.ijcard.2016.11.180. PMID 27866029.
  2. ↑ Joseph J, Naqvi SY, Giri J, Goldberg S (2016). "Aortic stenosis: pathophysiology, diagnosis and therapy". Am J Med. doi:10.1016/j.amjmed.2016.10.005. PMID 27810479.
  3. ↑ Otto CM, Prendergast B (2014). "Aortic-valve stenosis--from patients at risk to severe valve obstruction". N Engl J Med. 371 (8): 744–56. doi:10.1056/NEJMra1313875. PMID 25140960.
  4. ↑ 4.0 4.1 Dweck MR, Boon NA, Newby DE (2012). "Calcific aortic stenosis: a disease of the valve and the myocardium". J Am Coll Cardiol. 60 (19): 1854–63. doi:10.1016/j.jacc.2012.02.093. PMID 23062541.
  5. ↑ 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 Thorac Cardiovasc Surg. 148 (1): e1–e132. doi:10.1016/j.jtcvs.2014.05.014. PMID 24939033.
  6. ↑ 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.
  7. ↑ Stout KK, Verrier ED (2009). "Acute valvular regurgitation". Circulation. 119 (25): 3232–41. doi:10.1161/CIRCULATIONAHA.108.782292. PMID 19564568.
  8. ↑ Mokadam NA, Stout KK, Verrier ED (2011). "Management of acute regurgitation in left-sided cardiac valves". Tex Heart Inst J. 38 (1): 9–19. PMC 3060740. PMID 21423463.
  9. ↑ Enriquez-Sarano M, Tajik AJ (2004). "Clinical practice. Aortic regurgitation". N Engl J Med. 351 (15): 1539–46. doi:10.1056/NEJMcp030912. PMID 15470217.
  10. ↑ Devlin WH, Petrusha J, Briesmiester K, Montgomery D, Starling MR (1999). "Impact of vascular adaptation to chronic aortic regurgitation on left ventricular performance". Circulation. 99 (8): 1027–33. PMID 10051296.
  11. ↑ Nishimura, RA. (2002). "Cardiology patient pages. Aortic valve disease". Circulation. 106 (7): 770–2. PMID 12176943. Unknown parameter |month= ignored (help)
  12. ↑ BLAND EF, DUCKETT JONES T (1951). "Rheumatic fever and rheumatic heart disease; a twenty year report on 1000 patients followed since childhood". Circulation. 4 (6): 836–43. PMID 14879491.
  13. ↑ Gordon SP, Douglas PS, Come PC, Manning WJ (1992). "Two-dimensional and Doppler echocardiographic determinants of the natural history of mitral valve narrowing in patients with rheumatic mitral stenosis: implications for follow-up". J Am Coll Cardiol. 19 (5): 968–73. PMID 1552121.
  14. ↑ Sagie A, Freitas N, Padial LR, Leavitt M, Morris E, Weyman AE; et al. (1996). "Doppler echocardiographic assessment of long-term progression of mitral stenosis in 103 patients: valve area and right heart disease". J Am Coll Cardiol. 28 (2): 472–9. doi:10.1016/0735-1097(96)00153-2. PMID 8800128.
  15. ↑ Circulation http://circ.ahajournals.org/content/112/3/43November (2016) Accessed on November 22, 2016
  16. ↑ Circulation http://circ.ahajournals.org/content/112/3/43November (2016) Accessed on November 22, 2016
  17. ↑ Marcus RH, Sareli P, Pocock WA, Barlow JB (1994). "The spectrum of severe rheumatic mitral valve disease in a developing country. Correlations among clinical presentation, surgical pathologic findings, and hemodynamic sequelae". Ann Intern Med. 120 (3): 177–83. PMID 8043061.
  18. ↑ Circulation http://circ.ahajournals.org/content/112/3/43November (2016) Accessed on November 22, 2016
  19. ↑ Kusiak V, Brest AN (1986). "Acute mitral regurgitation: pathophysiology and management". Cardiovasc Clin. 16 (2): 257–80. PMID 3742524.
  20. ↑ 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: executive summary: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines". J Am Coll Cardiol. 63 (22): 2438–88. doi:10.1016/j.jacc.2014.02.537. PMID 24603192.
  21. ↑ 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: executive summary: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines". J Am Coll Cardiol. 63 (22): 2438–88. doi:10.1016/j.jacc.2014.02.537. PMID 24603192.

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