Ventricular tachycardia due to marijuana use in a heart transplant patient.

– The high and pointed T wave indicates the first level of ischaemia (level 1 ischaemia). If ischaemia does not progress, it can be suspected that the myocardium is completely protected by coronary and extracoronary collateral circulation9 – ST segment elevation indicates a more advanced stage of ischaemia (level 2 ischaemia), probably due to a conditioning phenomenon10 – The electrocardiographic pattern of S wave disappearance corresponds to a completely unprotected myocardium (level 3 ischaemia). In this level of ischaemia, the most significant and compromising ventricular arrhythmias appear, such as disruption of conduction10