Welcome to RK.MD
A platform where cardiac anesthesiologist and intensivist Dr. Rishi Kumar shares insights in perioperative medicine, critical care, education, and tech while promoting curiosity and lifelong learning.
From The Blog
pCO₂ Gap
The venous-to-arterial carbon dioxide difference (PCO₂ gap), defined as PcvCO₂ (taken from a central line blood gas) – PaCO₂ (taken…
Vitamin K (Phytonadione)
Vitamin K (phytonadione) is an essential, fat-soluble cofactor for γ-carboxylation of clotting factors II, VII, IX, and X, as well…
The Systems Behind My Productivity
This post was last updated on 5/27/2026. Between the operating room, ICU responsibilities, education, research, content creation, app development, administrative…
Mitral Valve Paravalvular Leak Closure
Mitral paravalvular leaks (PVL) occur when there is dehiscence between the prosthetic sewing ring and the native annulus, allowing blood…
UniFi 5G Backup
My homelab has gradually evolved into infrastructure I rely on every day. VPN access, dashboards, containers, AI workloads, monitoring, and…
On-X Mitral Valve Stuck Leaflet
One of the first things I look for when performing transesophageal echocardiography (TEE) for a mitral valve replacement is how…
