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75-year-old presents with syncope. ECG: HR 38 bpm, P waves dissociated from QRS. BP 80/50. No reversible cause found. What are the immediate and definitive management steps?

A patient presents with chest pain. ECG shows changes in multiple leads. How do I distinguish STEMI requiring immediate cath lab activation from NSTEMI that can be managed medically initially?

48F with schizophrenia on haloperidol, recently started azithromycin for community-acquired pneumonia. Routine ECG shows QTc 520ms (up from baseline 440ms). She is also on ondansetron for nausea. At what QTc threshold do we stop the offending drug? What electrolyte corrections are needed? When is the risk of Torsades de Pointes highest?

55M comes to ED with BP 220/130, severe headache, no focal neuro deficits, fundoscopy normal, no chest pain, ECG normal, troponin negative, creatinine 1.1. Is this hypertensive emergency or urgency? Is IV nicardipine needed or can we use oral amlodipine or labetalol? What is the target BP reduction rate and timing?

62F with palpitations and mild dyspnea for 6 hours. ECG shows AF with HR 130 bpm. BP 118/78, no hemodynamic compromise. Echo last year was normal. No prior AF history. CHA2DS2-VASc score = 3. Wondering whether to attempt pharmacological or electrical cardioversion today vs starting rate control and anticoagulation. Duration is under 48 hours. What is the best approach and when is immediate cardioversion truly indicated?