They start with the renin-angiotensin-aldosterone system and trace how ACE inhibitors, ARBs, aldosterone antagonists, and direct renin inhibitors lower blood pressure and protect the heart and kidneys. The conversation stays grounded in practical nursing monitoring: cough, angioedema, potassium, renal function, and the drug combinations that quietly raise risk.

This chapter zooms in on drugs that quiet the sympathetic nervous system or relax vascular smooth muscle. Alex and Sophia connect atenolol, propranolol, doxazosin, and nitroglycerin to practical bedside decisions like holding parameters, orthostatic precautions, and dangerous drug combinations.

Alex and Sophia turn to the meds that move fluid around the body, which sounds simple until potassium, hearing, glucose, gout, and digoxin all enter the room. The core theme is electrolyte balance and why nursing assessment matters before, during, and after diuretic therapy.

The rhythm chapter maps the main antiarrhythmic classes onto real clinical thinking: which arrhythmias they treat, what toxicities to look for, and why ECG monitoring is non-negotiable. Sophia keeps returning to the idea that antiarrhythmics are powerful tools, but never casual ones.