machinery murmur

murmur /mur·mur/ (mur´mer) [L.] an auscultatory sound, particularly a periodic sound of short duration of cardiac or vascular origin.

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anemic murmur  a cardiac murmur heard in anemia.

aortic murmur  one generated by blood flowing through a diseased aorta or aortic valve.

arterial murmur  one over an artery, sometimes aneurysmal and sometimes constricted.

Austin Flint murmur  a presystolic murmur heard at the apex in aortic regurgitation.

cardiac murmur  one of finite length generated by turbulence of blood flow through the heart.

Carey Coombs murmur  a rumbling mid-diastolic murmur occurring in the active phase of rheumatic fever.

continuous murmur  a humming cardiac murmur heard throughout systole and diastole.

Cruveilhier-Baumgarten murmur  one heard at the abdominal wall over veins connecting the portal and caval systems.

diastolic murmurs  cardiac murmurs heard during diastole, usually due to semilunar valve regurgitation or to altered blood flow through atrioventricular valves.

Duroziez's murmur  a double murmur over the femoral or other large peripheral artery; due to aortic insufficiency.

ejection murmur  a type of systolic murmur usually heard in midsystole when ejection volume and velocity of blood flow are maximal, such as in aortic or pulmonary stenosis.

extracardiac murmur  one heard over the heart but originating from another structure.

friction murmur  see rub.

functional murmur  a cardiac murmur generated in the absence of organic cardiac disease.

Gibson murmur  a long, rumbling cardiac murmur heard for most of systole and diastole, usually in the second left interspace near the sternum, indicative of patent ductus arteriosus.

Graham Steell's murmur  one due to pulmonary regurgitation in patients with pulmonary hypertension and mitral stenosis.

heart murmur  cardiac m.

innocent murmur  functional m.

machinery murmur  Gibson m.

musical murmur  a cardiac murmur having a periodic harmonic pattern.

organic murmur  one due to a lesion in an organ, e.g., the heart, a vessel, or a lung.

pansystolic murmur  a regurgitant murmur heard throughout systole.

pericardial murmur  see under rub.

prediastolic murmur  a cardiac murmur heard just before and with diastole; due to mitral obstruction, or to aortic or pulmonary regurgitation.

presystolic murmur  a cardiac murmur heard just before ventricular ejection, usually associated with atrial contraction and the acceleration of blood flow through a narrowed atrioventricular valve.

pulmonic murmur  one due to disease of the pulmonary valve or artery.

regurgitant murmur  one due to regurgitation of blood through an abnormal valvular orifice.

seagull murmur  a raucous murmur with musical qualities, such as that heard occasionally in aortic insufficiency.

Still's murmur  a low-frequency, vibratory or buzzing, functional cardiac murmur of childhood, heard in midsystole.

systolic murmurs  cardiac murmurs heard during systole; usually due to mitral or tricuspid regurgitation or to aortic or pulmonary obstruction.

to-and-fro murmur  a friction rub heard in both systole and diastole.

vascular murmur  one heard over a blood vessel.

vesicular murmur  vesicular breath sounds.

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ma·chin·er·y murmur (m-shn-r, -shnr)

n.

See Gibson murmur.

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machinery murmur.

See Gibson's murmur.

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machinery murmur

Cardiology A continuous harsh, rasping or rumbling cardiac murmur characteristic of patent ductus arteriosus that begins shortly after the first sound, reaches a maximum at the end of systole and wanes in late diastole; the MM is best heard in the 2^nd left intercostal space, transmits to the chest and neck and may be felt by the Pts as a palpable thrill or 'buzz'; it may also be heard in VSD, rarely in pulmonary HTN and in penetrating soft-tissue injury with formation of an AV fistula