心電図1000 001
<pdf w="1200" h="700">ECG Practice 001.pdf</pdf>
- 57歳 男性 術前心電図
- 解釈：正常洞調律。70回/分。PQ間隔 0.16s。QRS間隔 0.96s。QT間隔は正常。QRS軸は30°。正常な心電図。
- Interpretation: Normal sinus rhythm (NRS) 70/min. PR.16, QRS.96, QT normal for the rate. Axis 30°Normal ECG.
- Comment: There is a P before each QRS, so the rhythm is sinus. Rate-there are just over 4 large squares between R waves (the RR interval); the rate calculation is 300/4 = 75, and because the RR is just above 4 large squares, the rate is a bit lower, about 70/min. QT interval-it is less than half the RR interval, roughly normal. Axis-refer to Fig 1.2. The QRS is almost isoelectric in III (positive and negative forces canceling each other), so the QRS vector is about 90°from lead III, or +30°. Actually, the negative Q wave in III is slightly bigger than the R wave, so the axis may be closer to 25°. Morphology-there is baseline artifact in V6 that is not worth mentioning. An isolated Q wave in III is a normal finding; inferior MI requires Qs in multiple inferior leads. Note the 1.0-mV standardization deflection at the far left of the tracing; this may be excluded from subsequent tracings. A normal ECG! When you read ECGs in the hospital, you may be surprised to find that normal tracings are outnumbered by those with pathology.