Supraventricular Tachycardia Download

Transcript
Antiarrhythmic drug
administration
Hypoxia
Ischaemia
Atrial fibrillation
Electrical shock administered during
cardioversion
Electrical shock caused by accidental
contact with improperly grounded
equipment
Tachycardia
Presented By Johnny J.
What is Supraventricular Tachycardia?
Supraventricular means “Coming from above the
Antiarrhythmic drug administration
Hypoxia
Ischaemia
Atrial fibrillation
Electrical shock administered during cardioversion
Electrical shock caused by accidental contact with
improperly grounded equipment
o.”
Tachycardia means “Fast Heart Rate.”
What is Supraventricular Tachycardia?
Supraventricular Tachycardia (SVT)
Paroxysmal Supraventricular Tachycardia (PSVT)
Paroxysmal Atrial Tachycardia (PAT)
Etiology [Cause]
Most Supraventricular Tachycardia results
from abnormal electrical connections in the
heart that short-circuit the normal electrical
system.
What causes these abnormal pathways is not clear
Etiology [Cause]
During an episode of Supraventricular
Tachycardia (SVT), the heartbeat is controlled
by the SA node (not The normal timer of the
heart). Another part of the heart overrides this
timer with faster impulses. The source or ‘trigger’
of the impulse in an SVT is somewhere above
the ventricles, but the impulse then spreads to
the ventricles. The heart then contracts faster
than normal.
Etiology [Cause]
Normally, the heart’s electrical system
precisely controls the rhythm and rate at which
the heart beats. In SVT, abnormal electrical
connections cause the heart to beat too fast.
speeds up to rates of about 150 to 200 beats
per minute and occasionally as high as 300.
After some time, the heart returns to a normal
rate of 60 – 100 beats per minute on it’s own or
after treatment.
Symptoms:
Symptoms last as long as the episode of SVT lasts.
This may be seconds, minutes, hours, or rarely longer.
Symptoms Include the following:
•Your pulse rate becomes 150 – 200 beats per minute.
•Palpitations (Feeling your heart beat)
•Dizziness, or Feeling Light Headed
•You may become breathless
•If you have angina, then an angina pain may be triggered by an
episode of SVT
•You may have no symptoms, You may only be aware that your
heart is beating fast.
Treatment:
Many episodes of Supraventricular Tachycardia (SVT) soon
stop and no treatment Is needed. If an episode of SVT
does last a long time or is severe you may be admitted to
a hospital to stop it.
Medicines which are given by injection into a vein will
usually stop an SVT. [Adenosine is commonly used]
Adenosine works by blocking
Verapamil is an alternative
if adenosine
is the
notheart.
advised.
electrical
impulses of
[People with asthma cannot have adenosine]
Electric Shock treatment is rarely needed to
stop an episode of SVT.
Exams:
Electrocardiogram [EKG]
A test that measures the electrical
signals that control the rhythm of your
heartbeat.
Exams:
Electrocardiogram [EKG]
The EKG between episodes of SVT is
usually normal. So, doing an ECG
between episodes of symptoms may
not be much help. However, if SVT is
suspected, you may be asked to
wear a small portable ECG recorder.
Some types record an ECG
continuously over 24 hours. Others are
designed so that you can switch it on
to record when you have symptoms.
This is called a Holter Monitor
Exams:
Electrocardiogram [EKG]
An EKG of Supraventricular Tachycardia
Other Exams:
•Ambulatory Electrocardiogram
records the electrical activity of your
•Echocardiogram
heart while you do your usual
activities.
is
a diagnostic
Manytest
heart
that
problems
uses
•Stress
Test
become
ultrasound
noticeable
waves to produce
only during
an
is used to evaluate the heart and
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image
the
heart
as exercise,
muscleeating,
and sex,
•Cardiac
Catheterization
vascular system
during exercise. It
stress,
the
heart's
bowel
valves.
movements, or even
Ishelps
a testanswer
that measures
to two general
blood pressure
sleeping.
•Electrophysiological
Study
within
questions:
the heart
1) Is there
and how
occult
much oxygen
is
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maps
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also
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the ability of
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heart
heart
is stressed
muscle.by exercise? 2) If
there is underlying heart disease,
how severe is it?
Once episodes of Supraventricular
tachycardia begin, they generally occur
again. These frequently stop spontaneously
or with simple maneuvers but may require
taking medications daily if they persist.
Medication treatment typically includes
beta-blockers, & calcium channel blockers.
•Reduce Stress in your life.
•Exercise regularly and maintain a healthy lifestyle.
•Eliminate caffeine and other stimulants and alcohol.
•Comply with medications and medical advice.
•Learn more about this condition.