Pulse ventricular tachycardia

You’re an anesthetist in the operating room. Your patient is a 65 years old male, who is undergoing an elective surgery - laparotomic colon resection because of cancerous changes. The patient is intubated in general anesthesia. Besides monitoring of standart vital functions, you have your patient on invasive monitoring of blood pressure via the radial artery. The end of this 4 hour surgery is coming. For this whole time, the patient was hemodynamically stable with blood loss of up to 200 ml. The heart rate alarm goes off signaling 145/min. Before proceeding with treatment, you excluded other causes of tachycardia such as pain, hypovolemia, bleeding or shallow level of anesthesia.
How do you assess the type of tachycardia on ECG?
65
years
man
RR
15 /min
HR
143 /min
SpO2
98 %
BP
111/71 (84) mmHg
temperature
36 °C
EKG
frequency: 145 bpm
Examination
FiO2: 35%
EtCO2: 4,0 KPa

Past medical history: hypertension, DM II treated with peroral antidiabetic drugs, myocardial infarction 6 months back - 90% diameter RIA stenosis treated with a stent