monitors

Gas Flowmeters

Variable area flowmeters consist of a tapered, vertically-oriented tube with the smallest diameter at the base and largest at the top. As a result, the cross-sectional area of the tube changes based on height....

Alaris® Pump Dynamic Pressure Display

It's relatively easy to determine the drug name, concentration, volume to be infused (VTBI), and dose/rate for medication on an Alaris® infusion channel. But what does that horizontal bar for each infusion represent?! Hint: it...

MAC, Cordis, Sheath Introducer – What’s The Difference?

As a cardiothoracic anesthesiologist and intensivist, I routinely place large central lines for resuscitation, vasoactive/inotrope administration, and to facilitate additional monitoring (ie, Swan Ganz catheter). Over the years, I've heard "MAC", "sheath introducer", "Cordis",...

Apple Watch 6 Does NOT Measure “Blood Oxygen”

"With Apple Watch Series 6, you can measure your blood oxygen right from your wrist." This was the punch line for Apple's latest update to its Watch lineup during the "Time for a recap" event...

RA/CVP Waveform Interpretation

Central venous pressure (CVP) or right atrial pressure (RAP) waveform tracings can often times provide useful insight about a patient’s right ventricle (RV), tricuspid valve (TV), and overall cardiopulmonary status. The waveform morphology is...

Cardiac Output: Fick And Thermodilution

Systemic cardiac output (CO) is the product of left ventricular stroke volume and the heart rate (CO = SV x HR). I see CO measured with thermodilution (Td) and the Fick equation... two techniques...

“Is This EKG Real Or Artifact?”

In the world of perioperative and intensive care medicine, I'm surrounded by continuous monitors; however, it's important to understand how monitors work (and the pitfalls associated with them) before one interprets the numbers they...

Fluid Warmers

Hypothermia has a profound impact on the entire body - it compromises the immune system leading to a higher risk of post-operative wound infections, promotes coagulopathy, decreases drug metabolism and wound healing, delays emergence...

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