I work in the IMCU. It's a 1:4 ratio. Vitals q4. Most patient on tele but occasionally one isn't (usually med-surg overflow, or patients who have stabilized enough and are near discharge). We do some drips (such as nitro, dobutamine, lasix, amio, diltiazem, milrinone) but no pressors. No vents.
In my experience the difference between IMCU, stepdown, progressive care, or telemetry isn't usually significant. But at our hospital we only have the IMCU and a cardiovascular stepdown.