Final Flashcards
What means the ability to transmit electrical current for one cell to another
conductivity
the P wave of an ECG complex represents
Firing of the SA node and Atrial depolarization
What phase is the plateau stage of the action potential
phase 2
The imaginary line that can be drawn between the positive and negative electrodes in leads I, II, and III is called
axis
Parasympathetic nervous system
slows the heart rate and AV conduction
You do a 12 lead ECG on a chronic emphysema pt and note large, peaked P waves in leads I and II this would be termed as
Cor Pulmonale
Which of the following are unipolar leads I. aVL II. Lead II III. Lead III IV. aVR V. V6
I. aVL
IV. aVR
V. V6
QRS complex represents
Ventricular depolarization and Ventricular contraction (A and D)
What is the rapid upstroke in the action potential (phase)
Phase 0
The entire sequence of electrical changes during depolarization and repolarization is called
action potential
The PR interval represents
Total atrial electrical activity prior to the activation of the bundle of His
What conducts electrical impulses from the SA node directly to the left atrium
Bachmanns bundle
An increased duration or amplitude of the P wave indicates the presence of atrial abnormalities, such as hypertension, valvular disease, COPD, and CHF T/F
True
Which of the following monitor the elctrical activity of the heart in the frontal plane
aVL, aVF, lead II, lead I
The sympathetic neural fibers innervate the
Atrium of the heart and Ventricles of the heart
An elevated ST segment above the isoelectric line can be a sign of
myocardial injury
The small squares on standard ECG paper represent
0.04 seconds
Which of the following phases is called the resting state
Phase 4
T waves are sensitive indicators for the presence of a number of abnormalities such as I. Acid-Base imbalances II. Hyperventilation III. Hyperkalemia IV. Ischemia V. Various drugs
(all of the above)
An electrical difference across the fibers of the heart is called
resting membrane potential
the norm duration of the P wave is no longer than
0.8 to 0.11 seconds
When the parasympathetic system is stimulated the heart rate increases T/F
False
When can a strong stimulus cause an unwanted depolarization of the heart
Relative refractory period
If there is a complete heart block at the AV node, the ventricular escape rate at which the ventricles will pace themselves is
20-40 bpm