How To Examine Jugular Venous Pressure
Examination of jugular
venous pressure is one of the main component of systemic examination of
cardiology ward.The JVP can be estimated by observing the level of blood in
either the internal or external jugular vein.Both vein have valve but it is
less in internal jugular vein.As blood flow towards the heart,the do not affect
this and may even make the waveform easier to see.The normal waveform has
2 peaks per cycle which help them distinguish it from the carotid artery pulse.
The JVP reflects
central venous or right atrial pressure(normally < 7mm/Hg/9cm H2O) and
indirectly right ventricular function.The sternal angle is approximately 5cm
above the right atrium ,so the JVP should be no more than 4cm above this angle
when the patient lies at 45 degree.If the JVP is low ,the patient may have to
lie flat for it to be seen,if high,the patient may need to sit upright.
Position Of Jugular Vein and Carotid Artery
The internal jugular
vein enter the neck behind the mastoid process.It run deep to
sternocleidomastoid muscle before entering the thorax between the sternal and
clavicular head and can only be examined when the neck muscle are
relaxed.Although the vein itself cannot be seen,a diffuse pulsation is visible
when the pressure in the internal jugular vein is elevated.
The external jugular
vein is more superficial ,prominent and generally easier to see.Although it can
be obstructed as it traverse the deep fascia of the neck,this rarely present a
problem.If it is visible,pulsatile and not obstructed,it can be used to
assess JVP.Due to the anatomy of the innominate vein,the JVP is best examined
on the patient's right side and internal jugular vein is used.
The carotid pulsation
best feel at the anterior border of sternocleidomastoid muscle along the
superior border of thyroid cartilage.
Procedure:
1.Position the patient
so that he is reclining supine comfortably until the waveform is clearly
visible(at 45 degree).
2.Rest the patient 's
head on a pillow to ensure that the neck muscle are relaxed.
3.Look across the neck
from the right side of the patient .
4.Identify the jugular
vein(can use torchlight for identification) and its pulsation.
5.If you are not
certain,use the abdomino-jugular reflux or occlusion to confirm it is the JVP.
-Abdomino-jugular reflux:
Gently press over the
abdomen for 10 seconds.This is increase venous return to the right side of the
heart temporarily and JVP normally rises.This rise may take 15 second to
decrease in congestive heart failure.
-Occlusion:
The JVP waveform is
obligated by gently occluding the vein at the base of the neck with your
finger.This help to differentiate between carotid artery and jugular vein
.(Remember ,we need only jugular vein,not carotid artery).By pressing at the
base of the neck with your finger,try feel for pulsation along SCM muscle.If
there is still pulsation with pressing at the base,it will be the carotid
artery.Due to the thick wall of artery ,pulsation will be present even with
pressing.If the pulsation is absent with pressing at the base,then it is the
jugular vein which we needed.
6.The JVP is the
vertical height in cm between the top of the venous pulsation and the sternal
angle,whether they are sitting at 45 degree or not.
7.Identify the timing
and form of the pulsation and note any abnormality..
by Lakdhes.