Clicker questions exam 2 Flashcards
Which of the following represents the mean electrical axis of the heart ?
a. 29 degrees
b. 59 degrees
c. 30 degrees
d. 120 degrees
b. 59 degrees
Of the three bipolar leads, which one is connected to both left and right arms?
A. Lead I
B. Lead II
C. Lead III
D. All leads are connected to only one arm each
A. lead I
Which of the following is the direction of bipolar lead III?
A. 0°
B. 60°
C. 90°
D. 120°
D. 120°
Which of the following events is generally not seen on a typical ECG?
a. Atrial depolarization
b. Atrial repolarization
c. Ventricular depolarization
d. Ventricular repolarization
b. Atrial repolarization
In a typical ECG, which of the following waves occurs at the beginning of the contraction of the atria?
a. T
b. R
c. S
d. P
e. Q
d. P
In the ECG shown below, which of the following heart activities is represented? (Lead III)
A. Sinus tachycardia
B. Sinus bradycardia
C. Complete AV block
D. Incomplete second degree block with dropped beats
B. Sinus bradycardia
Which of the following condition may result in tachycardia?
A.Toxic conditions of the heart
B. Increased body temperature
C. Sympathetic nerve stimulation
D. All of the above
E. B and c only
D. all of the above
Circus movements are the basis of heart fibrillation. Which of the following statement is NOT true?
A. Fibrillation may occur when the refractory period of the muscle is greatly shortened
B. Fibrillation may occur when the pathway around the circle is too short
C. Fibrillation may occur when the conduction velocity slows downs
D. Fibrillation may occur when the heart becomes dilated
B. Fibrillation may occur when the pathway around the circle is too short
What does the ECG indicate?
Sinus Tachycardia Lead I
What does the ECG Indicate?
Sinus Bradycardia
What does the Tachyocardiogram Indicate?
Sinus Arrythmia
a little pattern w/ normal breathing
w/ deep breathing HR increases
measure of Heart rate…notice scale reversed
What does the ECG Indicate?
Sinoatrial Nodal Block
Lead III
P , slight p, no P from 3rd on
What does the ECG Indicate?
Prolonged P-R Interval - First Degree Atrioventricular (A-V) heart block
Lead II
Don’t drop any QRS waves
What does the ECG Indicate?
Second Degree Atrioventricular (A-V) Block Lead V3
Dropped a QRS wave!!
What does the ECG Indicate?
Complete Atrioventricular (A-V) Block
no relation between P waves and rate of QRS- T complexes
What does the ECG Indicate?
Partial Intraventricular Block
(Electrical Alternans)
Lead III
Note change in amplitude of QRS complexes
Even P waves show some irregularities in their Amplitude
What does the ECG Indicate?
Atrial Premature Beat
Lead I
SA node messed up
What Does the ECG Indicate?
A-V nodal Premature Contraction
Lead III
P waves combine with QRS wave.
AV node fired early before he Signal from the SA node
What Does the ECG Indicate?
Atrial Paroxysmal Tachycardia
Lead I
What Does the ECG Indicate?
Ventricular Paroxysmal Tachycardia
Lead III
What Does the ECG Indicate?
Ventricular Fibrillation
Lead II
What Does the ECG Indicate?
Atrial Fibrillation
Normal QRS but no P waves
What does the ECG Indicate?
Normal
Lead I
What does the ECG Indicate?
Normal
Lead II
What does the ECG Indicate?
Normal
Lead III
84% of the blood volume is in the systemic circulation, of this, 64% is in which of the following vessels?
A. Capillaries
B.Systemic arterioles
C. Veins
D. Arterioles
C. Veins
Blood flow resistance is indirectly proportional to which of the following?
A. Viscosity
B. Vessel diameter
C. Density
D. Both a and c
B. Vessel diameter
Reynolds number is a measure of which of the following parameters?
A. Tendency for turbulence
B. Blood pressure
C. Conductance
D. Resistance
A. Tendency for turbulence
Which of the following represents the viscosity of blood with a hematocrit of 38-42?
A. 1.5
B. 3.0
C. 38
D. 42
B. 3.0
Note 1.5 = Viscosity of Plasma
The least amount of damping of the pressure pulses would occur in which of the following components of the circulatory system?
a. Femoral artery
b. Arterioles
c. Capillaries
d. Venules
A. Femoral Artery
Which of the following factors affect(s) pulse pressure?
a. Vascular elastance
b. Arterial compliance
c. Stroke volume
d. All the above
e. B and C only
e. B and C only
Which of the following is the most important means for the exchange of substances between the blood and the interstitial fluid?
a. Blood hydrostatic pressure
b. Capillary oncotic pressure
c. Diffusion
d. Interstitial fluid hydrostatic pressure
e. Osmosis
c. Diffusion
Vascular distensibiliy is directly proportional to which of the following?
A. Increase in Volume
B. Increase in Pressure
C. increase in resistance
D. All of the Above
A. Increase in Volume
If rate of blood flow through the entire circulatory system (=cardiac output) = 100 ml/sec AND the pressure different from the systemic arteries to the systemic veins = 100mm Hg; the total peripheral resistance is equal to…?
A. 10 PRU
B. 1 PRU
C. 0.01 PRU
D. 100,000 PRU
B. 1 PRU
