Hyperkalemia-induced Wide QRS Complex: This is the most direct and likely cause, as high levels of potassium can disrupt normal cardiac conduction, leading to widened QRS complexes. Hyperkalemia can be due to various reasons such as renal failure, certain medications, or excessive potassium intake.

Ventricular Tachycardia (VT): VT can present with a wide QRS complex and may be associated with hyperkalemia, especially if the condition is due to a myocardial infarction or other cardiac issues.
Bundle Branch Block: While not directly caused by hyperkalemia, a pre-existing bundle branch block can present with a wide QRS complex, and if the patient develops hyperkalemia, it could exacerbate cardiac symptoms.
Cardiac Glycoside Toxicity: Digitalis toxicity can cause a wide range of cardiac arrhythmias, including those with wide QRS complexes, and can be associated with hyperkalemia due to the inhibition of the Na+/K+-ATPase pump.

Myocardial Infarction: Although not directly linked to hyperkalemia as a cause, myocardial infarction can lead to both wide QRS complexes (due to ventricular arrhythmias) and hyperkalemia (due to cell lysis). Missing this diagnosis could be fatal.
Trauma or Rhabdomyolysis: Severe trauma can lead to muscle breakdown (rhabdomyolysis), releasing potassium into the bloodstream and causing hyperkalemia, which in turn can lead to wide QRS complexes.

Hypokalemic Periodic Paralysis with Hyperkalemic Episode: Although typically associated with hypokalemia, some forms of periodic paralysis can have hyperkalemic episodes, and cardiac manifestations can include wide QRS complexes.
Familial Hyperkalemic Periodic Paralysis: A rare genetic disorder that can cause episodes of hyperkalemia, potentially leading to cardiac arrhythmias with wide QRS complexes.
Thyroid Storm with Hyperkalemia: Though rare, thyroid storm can lead to hyperkalemia and cardiac arrhythmias, including those with wide QRS complexes, due to the extreme metabolic state.