Hemodialysis filters small waste products by diffusion across a membrane during 3–4 hour sessions, while CVVH removes larger molecules by convection continuously for 24 hours in unstable ICU patients.
What's the difference between CVVH and CVVHD?
CVVH clears fluid and solutes mainly through convection using replacement fluid, while CVVHD removes small to medium molecules by diffusion without replacement fluid.
Both are continuous therapies used in ICUs, but they work differently. CVVH excels at removing big molecules, whereas CVVHD focuses on small solutes and fluid removal through a dialysate bath. Doctors choose based on what needs clearing and how stable the patient is.
How does hemofiltration differ from hemodialysis?
Hemodialysis removes small waste products mainly by diffusion, while hemofiltration clears solutes—including larger ones like myoglobin—through convection using ultrafiltration and replacement fluid.
Hemodiafiltration mixes both methods. These differences help doctors pick the right therapy based on what needs to be cleared and how well the patient handles fluid shifts.
What does CVVH stand for?
CVVH stands for Continuous Veno-Venous Hemofiltration.
| Term | Full Form |
|---|
| CVVH | Continuous Veno-Venous Hemofiltration |
| CVVHD | Continuous Veno-Venous Hemodialysis |
| CVVHDF | Continuous Veno-Venous Hemodiafiltration |
Are CVVH and CRRT the same thing?
CVVH is just one type of therapy under the CRRT umbrella; CRRT covers all continuous treatments like CVVH, CVVHD, and CVVHDF.
CRRT runs 24/7 to clear waste and remove fluid gently, making it ideal for patients who can't handle regular dialysis sessions.
Which three dialysis types matter most?
The three main dialysis options are in-center hemodialysis, home hemodialysis, and peritoneal dialysis.
Each has its own schedule, location, and lifestyle impact. Patients can switch between them as their needs or preferences change.
What principles guide hemodialysis?
Hemodialysis works by moving small waste products across a semipermeable membrane while blood and dialysate flow in opposite directions.
This clears toxins and balances electrolytes, but it needs good vascular access and usually runs 3–5 hours, three times a week. Honestly, this is the most common way patients manage kidney failure long-term.
Can someone stay on dialysis around the clock?
Yes, continuous therapies like CRRT can run 24 hours daily and are often used in ICUs for acute kidney injury.
This gentler approach works better for critically ill patients with unstable blood pressure or sepsis.
Why do doctors prescribe CRRT?
CRRT removes fluid and dangerous uremic toxins in hemodynamically unstable AKI patients who can't handle standard dialysis.
It keeps acid-base and electrolytes balanced during critical illness, supporting organ function without overstressing the heart.
When should CVVH start?
Begin CVVH within 24 hours of recognizing acute kidney injury when the patient can't tolerate regular dialysis due to instability.
Starting earlier—ideally within 8–24 hours—may boost survival in critically ill patients with multiple organ problems. The exact timing depends on how the patient's doing and their urine output.
Why use CVVH at all?
CVVH acts as a temporary fix for sudden kidney failure in patients too unstable for regular dialysis, offering gentle, continuous toxin and fluid removal.
A large catheter lets blood flow continuously through a hemofilter, with fluid replacement adjusted to keep the patient stable.
What exactly is SLED-D?
SLED-D stands for Sustained Low-Efficiency Daily Dialysis, a hybrid ICU therapy that runs 6–12 hours daily for gentle but effective treatment.
It's gentler on circulation than standard dialysis but clears more waste than intermittent sessions, making it great for critically ill AKI patients.
What conditions need dialysis?
Dialysis treats kidney failure by removing waste, extra fluid, and toxins while keeping electrolytes and blood pressure in check.
Without it, patients face life-threatening issues like dangerously high potassium or fluid buildup in the lungs.
What's the daily cost of CRRT?
Back in 2013, CRRT ran about $858 per day—way more than intermittent therapy at $226 per day.
Prices vary by hospital and location; CRRT needs special gear, trained staff, and constant monitoring, which drives up costs.
Who really needs CRRT?
CRRT helps critically ill AKI patients—often from sepsis, shock, or multiple organ failure—who are too unstable for regular dialysis.
It shines when patients need slow, gentle fluid removal or toxin clearance to recover from serious illness.
When can we stop CRRT?
Doctors usually stop CRRT when urine output hits at least 60 mL/hour in a stable patient.
Other signs include normal electrolytes, fixed acidosis, and good nutrition. Weaning happens gradually based on lab results and how the patient feels day-to-day.
