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Chapter 6A
The Michigan Instruments
Heart-Lung Resuscitator (HLR)
Heart-Lung Resuscitators (cardiopulmonary resuscitators) provide for both artificial
ventilation via a
mechanical
respirator, and sternal compression via a pneumatically
powered piston.
Four models are currently
in
use by Alcor:
the
Brunswick
HLR 50-90, and
the three variants of the Michigan Instruments Mli-HLR.
This Chapter will cover operating
instructions in detail for
the
Michigan Instruments High
Impulse
CPR and the Simultaneous
Compression-Ventilation CPR units.
Heart-lung resuscitators
are utilized in the transport of cryon1c suspensiOn patients
because manual cardiac compression and bag-valve ventilation lead to rapid exhaustion of
personnel.
The effectiveness of manual CPR, which is unsatisfactory to begin with,
rapidly deteriorates as operator fatigue sets in.
The very long periods (4 to 8 hrs.;
perhaps less
than
4
hrs.
if the
Patient Ice
Bath (PIB) is used) of HLR support necessary
to reduce patient core temperature
to
a safe
level
(lO"C) mandates
the
use of a mechanical
device.
. . .
.·
.
•
,__
.
....
·-
' : :::::-..
Figure 6A-l:
The Mil
Heart-Lung
Resuscitator.
6A-l
'
.
. .
.
.
.
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