A lateral sacral projection with accurate positioning demonstrates
1. the long axis of the sacrum aligned with the long axis of the collimated field.
2. near-superimposition of the greater sciatic notches.
3. an open L5-S1 intervertebral disk space.
4. the median sacral crest in profile.
a. 1 and 2 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 1, 2, 3, and 4
D
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On inspection of a patient's ECG strip, you note no identifiable P waves; rapid irregular undulations of the isoelectric line; and an irregular ventricular rhythm. In addition, the precordial cardiac rate is greater than the peripheral pulse rate. The most likely problem is:
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