| Where to start counting on an irregular rhythm? |
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| The first QRS complex of this irregular rhythm is on the dark line of the large box. Note where you start counting to determine the 6-second heart rate for an irregular rhythm. |
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| Note, with this irregular rhythm there are at least 3 small boxes before the FIRST QRS complex AND the line of the LARGE BOX. In fact, in this example we see 4 small boxes. So you start your counting of 30 large boxes at the starting point containing that first QRS complex. |
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| Note, with this irregular rhythm there are NOT at least 3 small boxes before the FIRST QRS complex AND the line of the LARGE BOX. In fact, in this example we see 1 (or 1.5) small boxes. So you start your counting of 30 large boxes by MOVING BACK 1 large box. |
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