S1Q3T3? What is this? When looking at your 12-lead ECG, try to identify the following: S-waves in lead I, Q-waves in lead III, and an inverted T-wave in lead III. You may also note inverted T-waves in V1, V2, V3.
What the S1Q2T3 is showing, is that the right side of the heart, is suffering from heart strain, also known as, right-sided heart failure (col pulmonale).
As always, this sign will NOT always be present. Never rule out a PE, because a 12-lead doesn't show the S1Q3T3. Remember, treat your patient, not the monitor - monitor is a tool. Follow local protocol.
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(pictures provided by: ems12lead.com