ECG Rhythm Strip Quiz 81: Interval measurements
Measure the intervals and correctly interpret the following rhythms.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Answers.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
It is sometime difficult to measure the intervals, especially if you do not have the strip right in front of you. There is also a degree of subjectivity to measuring intervals because you and I may see that a particular waveform may start or stop differently. Thus, you may not have gotten the exact measurements that I got. However, your intervals measurements should be within .02 sec of what I calculated. On irregular rhythms and rhythms with ectopy I counted the number of R waves in the 6 second strip and multiplied that number by 10. On regular rhythms, I counted the number of small blocks between the R waves and divided that number into 1500. The importance of measuring intervals is not in a single measurement but the trend over time. For example, a single QT interval value of 40 may not be significant. However, if that QT interval progressively lengthens over time to .48 then that is indicative of a problem.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Answers.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
It is sometime difficult to measure the intervals, especially if you do not have the strip right in front of you. There is also a degree of subjectivity to measuring intervals because you and I may see that a particular waveform may start or stop differently. Thus, you may not have gotten the exact measurements that I got. However, your intervals measurements should be within .02 sec of what I calculated. On irregular rhythms and rhythms with ectopy I counted the number of R waves in the 6 second strip and multiplied that number by 10. On regular rhythms, I counted the number of small blocks between the R waves and divided that number into 1500. The importance of measuring intervals is not in a single measurement but the trend over time. For example, a single QT interval value of 40 may not be significant. However, if that QT interval progressively lengthens over time to .48 then that is indicative of a problem.
Comments
Post a Comment