Pathophysiology And Clinical Features

The response of various organ systems to lowered temperature varies widely among individuals.34 and 5 In general, however, body temperatures from 32 to 35°C (89.6-95°F) constitute "mild" hypothermia. In this temperature range, the patient is in an excitation (responsive) stage, in which physiologic adjustments attempt to retain and generate heat.

When temperature drops below 32°C (89.6°F), general excitation gives way to the slowing (adynamic) stage, in which there is a progressive slowdown of bodily functions. Metabolism slows, causing a decrease in both oxygen utilization and CO 2 production. Shivering ceases when body temperature falls below 30 to 32°C (86-89.6°F).

In the initial excitation phase, heart rate, cardiac output, and blood pressure all rise. With decreasing temperature, these all decline. Cardiac output and blood pressure may be markedly depressed by the negative inotropic and chronotropic effects of hypothermia and further depressed by concomitant hypovolemia.

Hypothermia causes characteristic ECG changes and may induce life-threatening dysrhythmias (T§bIe...l8.6.-2). The Osborn (J) wave, a slow, positive deflection at the end of the QRS complex (Fig 1.86-1), is characteristic, though not pathognomic, of hypothermia.

I-wtit ttsetuímh

PE. QRSi QT fntovrim Hluirft Irrrot ircrftd OiSmn iJj 1 JTC

[IvdiljHiJIILIL

SiEilE b:jJhLji J j aiiijg nbiibirifl oí r-jiiEi Nt-iil chyihni

VfiAiculzj Uiillilicn

Was this article helpful?

0 0
How To Get Rid Of Bed Bugs

How To Get Rid Of Bed Bugs

If you seriously want know how to get rid of bed bugs, then this may be the most important letter you'll ever read!... Discover How To Solve Your Dilemma In What You Thought To Be Your Dream Vacation And Easily Taking The First Step To Conquer The Bed Bugs Trauma You May Have At This Moment! It doesn't matter, if you have never have any ideas on how to getting rid of bed bugs and how to banish it quickly in the shortest time possible, then this golden guides will show you everything steps you need to take against bed bugs banishing!

Get My Free Ebook


Post a comment