Final answer:
Nitroglycerine is the tech agent best correlated with increased coronary blood flow due to its vasodilating effects and rapid action when administered sublingually.
Step-by-step explanation:
The tech agent that has the best correlation to coronary blood flow is nitroglycerine, which is administered sublingually for its rapid absorption and immediate relief. Nitroglycerine works by releasing nitric oxide, a potent vasodilator, which relaxes smooth muscles in the coronary vessels, increasing blood flow to the myocardium. During medical emergencies like myocardial infarction (MI), this treatment, alongside others such as aspirin and thrombolytic agents like streptokinase, is vital. In addition to these immediate treatments, procedures like balloon angioplasty and stent placements are employed to physically open up blocked vessels and improve blood flow.