The Detroit times., 1913-12-06
HAT DOES YOUR
HEART SAY WHEN
DOCTOR LISTENS?
The Sound of the Normal Heart
Is Two Syllables, ''Lub-Dup,'
Like That
WAY IT'S PRONOUNCED
SIGNIFIES CONDITION

One Sound Made by Flow OF the
n Blood, Other by Closing OF
Aortic Valves
whan the doctor puts his ear 70
your chest or applies the stethosope'
which only conducts the sounds more
elearly what does he hear Tne
,.ound Of the normal heart is ike
yha accommodation Of the syllaoles
~lub dup close TO each other. Tnese
oyllables are heard In quick success
aion. and then comes pause-the
diastole. or resting period OF the gres.
force pump. The sound "lub" 10 tna'
( Uf the blood flowing out under mus
jcular pressure. and the dup" 10 the
closing Of the aortic valves. II this
3 saound dun" n not heard. 1t shows
\. fha2 the aort1o valves are destroyed
~ not working The latest explana-
4 Nm oe this nrst sound. "lub." 10 that
- - caused hy the muscular contrao-
4 I'm ot the heart and the impulse OF
~ heart against tho chest wall. The
booond sound u best heard over tho
koet1c valves. which lie beneath the
IN eide oe the chest Just oy tho
kAha RI.
L u yuu close . door with great force
~ 61am 4 very loud. and X the ten
&loa n the aorta n very high the
|1onud dup u louder than usual.
lXhas = mcst important TO the physi-
{r1on. for he then knows that there 10
!: IA aEter1Al tension. due to what
{ - toSned N aneurism-
* - tAo sound Tub u weaker than
4 gNog1nol, 4 would indicate . weakness
~ ne heart muscle. and this Is the
Do q fever1. n typhoid fever. for
otance. whom thlS flrst sound II
WY weak we know that the heart
I1D = weak - 70 mals the case
nlasnlne
y hsaxt . said - have q ~mur-
'tmnr~ whsn the sharp dup disap-
'Ireots ana the listening physician
Ih1nss : so6tened noise. called ''mur-
nnr.s n you Try to say dup" with
yUur nus open. the sound uttered VIII
~ I1le that the doctor hears In the
I 11ooosed heart whose valves do not
close prorxk 4 The sound produced
.Sis someth ~ 10 dun" and II the
Il SmiEral VAIN doss not work well the
INT syllable h softened into ''luff." )"
u both valves work poorly. the
n &cund q "lull-duA- uff-duH." but II
\, k,oth valves xre very much out Of or.
HI the sound ID ike that Of . bel
News, ~oho-0ho." nasssH
Il Most .persohs speak Of the heart
I! ~ M It were . single organ. but ac-
paliy It Is two hearts Joined to-
ether, the right and the left heart.
The right aends the blood through
he lungs 10 that It may be aerated.
4 IN acted upon by the oxygen in the
inhaled air. while the left heart sends
~ blood through the body In order
8 40 uolafish the tissues. Both Of these
N6oarts receive the blood from the
q large veins into the auricles, which.
III ~ contracting. send the blood on
INTO the ventricles. and when these
Dowerful muscles contract. the right
xontricle pumps the blood into the
pulmonary artery on the way to the
~ aorta. which distributes the blood
nil over the body. 90 that after hav-
s|lng nourished the nerves and muscles
Z u roturns through the veins to the
1onxt there TO be pumped into the
1unGD Tor publication by the oxygen
l8pesss again Dassing through the sys-
n The difference In tho sounds Of the
4<4GAt and left ventriclss IN traced to
I3no 1i6Crence In resistance Of the
sopftn and the pulmonary artery. The
Ipulmonary artery reststs with only
\ N4othird the strength OF the aorta.
- tAe pumping force required II less
M The noise Of the closing gates IL
\ That much less.
It - true. than, that when the
4 physician lntenS to the beating of q
pAtiant;s heart through his stetho-
ecope the heart speaks to him in un-
Z Uioeanbie language. When 1t plain
X " tDAyB "lubdub" he knows that all
= we'll With this important organ and
II ne pats the patient on the shoulder,
eaying: Nothing serious-you'll be
"a right In day or two" When
4 Aowevsr. the heart says 'lubdufr' he
Knows that the aortic valve II not
working properly and takes the prop
er steps to correct It, When the
heart says "luftdup" he is sure that
I the mitral valves are out of order.
Aeo he tries to reach them.
When the heart says 'luff-dufr' he
p14ws solemn face. for both valves
3'&s2 out OF order. and when It says
~ e-oho" he digs down into his bag
~ goes TO work at once, for all is