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5.1 In the electrocardiogram (ECG) of a healthy human,
a. the P wave is generated by the pacemaker current.
b. the P–R interval is normally 0.3 seconds.
c. the QRS complex coincides with ventricular depolarization.
d. atrial repolarization generates the T wave.
e. exercise shortens the ST interval.
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5.2 In the typical lead II electrocardiogram of a resting human,
a. the height of the QRS complex is approximately 100 mV.
b. the P–P interval is typically about 100 milliseconds.
c. the ST segment duration indicates, approximately, the duration of
ventricular systole.
d. the T wave is upright because subendocardial action potentials last
longer than subepicardial action potentials.
e. the T wave shortly precedes the second heart sound.
5.3 The cardiac dipole,
a. is a vector representing the negative and positive external charges on the
heart during ventricular depolarization.
b. rotates clockwise in the frontal plane, viewed from the front.
c. at its maximum size, points along the electrical axis of the heart.
d. is recorded in the horizontal plane by limb lead III.
e. points in roughly the same direction during repolarization and depolarization.
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a. lead aVR usually resembles a lead II recording turned upside down.
b. shortening of the R–R interval during inspiration indicates sinus arrhythmia.
c. a broad, slurred QRS complex is typical of a ventricular extrasystole.
d. an R wave that is larger in lead II than leads I or III indicates left axis
deviation.
e. regular P waves and regular QRS complexes can occur in complete
heart block.
f. an R–R interval of about 2 seconds is associated with Stokes–Adams
attacks.
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