Cardiac exam chapter 30,31,32
1. Identify the characteristics of:
Normal Sinus: Regular rhythm
Normal rate (60-100)
P wave for every QRS complex
All P waves similar in shape and size
All QRS complexes similar in shape and size, duration is less than 0.12 seconds
Normal PR (0.12-0.20 seconds)
Normal (upright and round) T waves
Tachycardia
Ventricular rhythm: regular
P wave: normal
QRS complex: normal
QT interval: may be low <0.36
Ventricular rate: > 100 bpm
PR interval: normal
T wave: normal
,Atrial Fibrillation
Ventricular rhythm: irregularly irregular
Ventricular rate: controlled: < 100 bpm; rapid ventricular response (RVR) or uncontrolled: 100-150 bpm
P wave: absent; replaced by fine fibrillatory waves
PR interval: indiscernible
QRS: normal
T wave: indiscernible
QT interval: unmeasurable
2. Identify:
Ventricular tachycardia:
A rapid ventricular rhythm defined as three or more consecutive PCVs.
can occur in short bursts, or runs, or may persist for more than 30 seconds (sustained ventricular
tachycardia).
The rate is greater than 100 bpm, and the rhythm is usually regular. Reentry is the usual
electrophysiologic mechanism responsible for VT. Myocardial ischemia and infarction are the
most common predisposing factors for VT. It also is associated with cardiac structural disorders
such as valvular disease, rheumatic heart disease, or cardiomyopathy
o Ventricular rhythm: regular
o Ventricular rate: 100-250 bpm
o P wave: absent
o QRS complex: wide and bizarre
o T wave: opposite direction of QRS complex
o QT interval: unmeasurable
How to treat:
o Treatment for ventricular tachycardia with pulse: cardioversion
Drugs: amiodarone,verapamil
o Treatment for pulseless ventricular tachycardia:defibrillation
, Drugs: amiodarone, (ATI says lidocaine and epinephrine--but I remember Toro saying
this is not used as much now that there are better meds--but probably good to know)
Ventricular Fibrillation:
o Quivering not contracting LETHAL RHYTHM-There is no cardiac output. Also known
as cardiac arrest. Death will follow the onset of VF within 4 minutes is rhythm is not
recognized and terminated to regain perfusion.
Rate: too rapid to count
o Rhythm: grossly irregular
o P: QRS: no identifiable P waves
o PR interval: none
o QRS: bizarre, varying in shape and direction
o An extremely rapid, chaotic ventricular depolarization causing the ventricles to quiver
and cease contracting; there is no cardiac output. This is known as cardiac arrest. It is a
medical emergency requiring immediate intervention with CPR. Death will follow the
onset of VF within 4 minutes if the rhythm is not recognized and terminated and an
effective perfusing rhythm reestablished.
o Clinically, loss of ventricular contractions results in the absence of a palpable or audible
pulse. The patient loses consciousness and stops breathing as perfusion ceases. The ECG
shows grossly irregular, bizarre complexes with no discernible rate or rhythm.
Treatment:
Immediate defibrillation, CPR/BLS!!
3. Know proper handling of continuous cardiac monitoring alarms and electrodes:
Provided by bedside and central monitoring stations.
Electrodes placed on chest which attach to the monitor worn around the neck or waist.
HR and rhythm visually displayed on bedside monitor connected to central monitor.
Central station allows simultaneous monitoring of multiple patients within a nursing unit.
Alarms on bedside monitor and central monitor will alert to rapid or slow HR and alarm limits are
set by the nurse.
4. Understand continuous telemetry monitoring and how troubleshoot problems.
5. Define lab values related to cardiac conduction.
6. Identify nursing care of patient needing Cardioversion and Defibrillation: