What characterizes ventricular tachycardia in terms of physiological disturbances?

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Ventricular tachycardia (VT) is characterized by a rapid heart rate originating from the ventricles, and it typically occurs due to increased myocardial irritability. This increased irritability can stem from factors such as ischemia, electrolyte imbalances, or structural heart changes. The electrical conduction within the myocardium becomes abnormal and causes the ventricles to contract at a high rate, which can disrupt normal cardiovascular function and lead to physiological disturbances.

In this state, the heart's ability to fill adequately between beats is compromised, which can further result in symptoms such as decreased cardiac output and potential hemodynamic instability. While it often leads to reduced blood pressure as a consequence of this impaired filling and contraction, it is the underlying increased myocardial irritability that serves as the fundamental characteristic driving the onset of ventricular tachycardia. Therefore, this acceleration is primarily a result of excitatory triggers affecting the ventricular myocardium.