Objectives: TreaTmenT of SepSiS: How To make Goal DirecTeD

Treatment of Sepsis: How to Make Goal Directed
Therapy a Consistent Approach in Your ED
Emanuel P. Rivers, MD, MPH
Vice Chairman and Director of Research, Department of Emergency Medicine
Senior Staff Attending, Emergency Medicine, and Critical Care
Henry Ford Health Systems, Detroit, Michigan
Objectives:
1. Quantify the prevalence and magnitude of sepsis mortality as it relates to Emergency Medicine.
2.Understand the pathogenesis of early sepsis which provides the therapeutic rationale for early
goal-directed therapy.
3.Understand the components of a sepsis quality initiative and its salutary impact on patient
outcomes and health care resource consumption.
INTRODUCTION
A Change in the Paradigm of Treating
Severe Sepsis and Septic Shock
Improvement in mortality for acute
trauma2
myocardial
infarction1,
3
and stroke have been realized by a
coordinated team approach, beginning
in the emergency department (ED), to
provide early identification of high risk
patients and time sensitive evidencebased therapies. Over 500,000 patients
present each year to the ED with severe
sepsis and septic shock, having a
resulting mortality ranging from 20%The same approach provided
60%.4
for acute myocardial infarction (AMI),
trauma and stroke has been lacking for
early sepsis management until recently.
Early goal-directed therapy (EGDT)
was developed as a quality initiative
which includes 1) assessment of the
hospital sepsis prevalence and mortality,
2) early identification of high-risk
patients, 3) mobilization of resources
for intervention, 4) reversal of early
hemodynamic perturbations, 5) assessing
compliance, 6) dedicated education of
health providers, 7) quantifying health
care resource consumption and 8)
assessing outcomes (Figure 1).
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The Early Hemodynamics of Sepsis
The early stages of sepsis can manifest as
a hypodynamic state of oxygen delivery
dependency causing elevated lactate
concentrations and low venous oxygen
saturations. Depending on the stage of
disease presentation and the extent of
resuscitation, however, a hyperdynamic
state, where oxygen consumption is
independent of systemic oxygen delivery
having normal to increased lactate
concentrations and high venous oxygen
saturation, may be more commonly
recognized.5,6 Thus, sepsis evolves as
a progression of hemodynamic phases
where lactate and central venous oxygen
saturation (ScvO2)/mixed central venous
oxygen saturation (SvO2) represent
the balance between systemic oxygen
delivery and demands and quantifying
the severity of global tissue hypoxia.6‑9
The hypodynamic phase in particular
is associated with the generation of
inflammatory mediators with increased
morbidity and mortality if unrecognized
or left untreated. This phase also can be
present with normal vital signs.10-12 Thus,
the hemodynamic derangements of sepsis
can be hypovolemia, vasodilatation,
myocardial depression and impairment of
oxygen utilization. These derangements
Over 500,000
patients present
each year to the ED
with severe sepsis
and septic shock,
having a resulting
mortality ranging
from 20%-60%.
37
ADVANCING THE STANDARD OF CARE:
Cardiovascular, Neurovascular and Infectious Emergencies
may exist alone or in combination beginning
upon hospital presentation (Table 1 and
Figure 2).
Previous Hemodynamic Optimization
Trials
Figure 1. An implementation model of early goal-directed therapy (EGDT)
Early work by Shoemaker et al.13 observed
that survivors of critical illness had supranormal levels of oxygen delivery compared
to non-survivors. This prompted some
clinicians to target supra-normal levels in
all critically-ill patients without outcome
benefit.14, 15 The relatively later timing of
the intervention in the intensive care unit
(ICU) setting, and absence of a deliverydependent phase of systemic consumption
with decreased SvO2 and increased lactate,
differentiates these studies from EGDT. A
meta-analysis of hemodynamic optimization
trials by Kern suggested early, but not
late, hemodynamic optimization reduced
mortality.16 It has since become increasingly
evident from multiple subsequent studies the
six hour time interval used in the EGDT trial
was not only important from a diagnostic
perspective, but had outcome implications
based on adequacy of care.17-21 EGDT was
performed for these patients in the pre-ICU
or ED phase of the disease, within hours of
patient presentation.
Table 1. The hemodynamic stages of sepsis
38
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Treatment of Sepsis: How to Make Goal Directed
Therapy a Consistent Approach in Your ED
The use of
lactate ≥ 4 mmol/L
as a marker for
severe tissue
hypoperfusion and as
Figure 2. The study design of early goal-directed therapy (EGDT)
a predictor of
mortality is supported
Early Recognition of the High Risk Patient
The use of lactate ≥ 4 mmol/L as a marker for severe tissue hypoperfusion and as a
predictor of mortality is supported by a number of studies.22-26 Although there is some
controversy regarding other potential mechanisms underlying lactate accumulation
in severe sepsis, serial lactate levels can assess lactate clearance or changes in lactate
over time.27 Nguyen et al. has also reconfirmed work by others showing increased
lactate clearance rates during the first 6 hours of sepsis presentation are significantly
associated with preserved organ function and improved survival.20, 28 Lactate levels
can be performed by venipuncture.
by a number of studies.
___________
Lactate levels can
be performed by
venipuncture.
The Components of EGDT
EGDT allows emergency physicians to diagnose and treat each of the hemodynamic
perturbations urgently (Figure 2) using recommendations and endpoints supported
by consensus statements from both critical care and emergency medicine.2932
The titration of intravenous fluid to a central venous pressure (CVP) of 8-12
mmHg provides an objective endpoint for preload optimization while preventing
volume overload. As a result, more fluid administration can be given initially
and safely, leading to a 14% reduction in vasopressor, steroid use and mechanical
ventilation.33‑35
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39
ADVANCING THE STANDARD OF CARE:
Cardiovascular, Neurovascular and Infectious Emergencies
While there is debate regarding whether
ScvO2 is a numeric equivalent to
SvO2,36‑41 it has clinical utility and reflects
outcome.21,42,43 The Surviving Sepsis
Campaign recommends an SvO2 of 65%
and an ScvO2 of 70% as resuscitation
endpoints.31, 38 Given the challenges of
using a pulmonary artery catheter (PAC)
in an early setting such as the ED, the
ScvO2 represents a convenient surrogate,
but not a replacement, for SvO2. While
continuous monitoring allows for a
more rapid adjustment of hemodynamic
variables
from
rapid
feedback,
intermittent values will suffice.
While there is debate
Acute anemia and global tissue hypoxia
provide potent stimuli for erythropoietin
regarding whether
production to increase marrow production
ScvO2 is a numeric
of red blood cells (RBCs).44 Severe
sepsis and septic shock patients who
equivalent to SvO2, it
have both an impaired marrow response
has clinical utility and
and variable erythropoietin levels
reflects outcome.
may lack this compensatory ability to
increase hemoglobin concentrations.45, 46
The combination of anemia and presence
of global tissue hypoxia represent the
physiologic rationale to transfuse RBCs
in these patients. Volume resuscitation
results in hemodilution. The threshold
for transfusion is based on consideration
of a physiologic rationale such as low ScvO2 and increased lactate
or global tissue hypoxia, a high-risk patient population, and expert
consensus. These are important considerations when comparing EGDT
patients to those enrolled in ICU transfusion studies. Hebert et al., Marik
et al. and others have shown a restrictive strategy of red-cell transfusion
(7-9 mg/dl) was “at least as effective and possibly superior to a liberal
transfusion strategy in critically ill patients.”47, 48 However, these studies
did not specifically address patients with severe sepsis and septic shock.
Patients with co-morbidities including atherosclerotic heart disease,
congestive heart failure, and renal failure are substantially represented
in the EGDT study. Excluding such patients limits the generalizability
of prior transfusion studies for patients with severe sepsis and septic
shock.49
40
In previous studies, dobutamine therapy
has been associated with increased
Not only did the
mortality.15,50
resuscitation endpoints of these studies
include
supra-physiologic
oxygen
delivery, but also some patients received
doses of dobutamine as high as 200
mcg/kg/min. The selection of patients
in a delivery dependent state, lower
dose, timing of therapy, and endpoints of
resuscitation were different between the
EGDT study and previous studies.51 In
the EGDT study, patients were treated
using a lower dobutamine dose (average
dose 10.3 mcg/kg/min to maximum 20
mcg/kg/min), which was titrated upward
to achieve ScvO2 ≥ 70%.9
Cerra et al. and Spronk et al. noted
hemodynamic improvement in the
microcirculation for septic patients with
the use of nitroglycerin.52,53 Vasodilator
therapy was used in 9% of EGDT patients
who met protocol criteria. These patients
had median baseline ScvO2 of 46 % and
a previous history of hypertension and
congestive heart failure. It is becoming
increasingly
evident
disordered
microcirculatory flow is associated with
systemic inflammation, acute organ
dysfunction, and increased mortality.
Using new technologies to directly
image microcirculatory blood flow may
help define the role of microcirculatory
dysfunction in oxygen transport and
circulatory support.54
egdt Effects on Systemic Inflammation and Organ Dysfunction
There is a pathologic link between
the clinical presence of global tissue
hypoxia, generation of inflammation,
and the mitochondrial impairment
of oxygen utilization seen in septic
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Treatment of Sepsis: How to Make Goal Directed
Therapy a Consistent Approach in Your ED
The Effect of EGDT on Mortality
The baseline mortality of 51% prior to the
study was reduced to 46.5% with standard
care and 30.5% after the introduction of
EGDT at the Henry Ford Health Center.
Published programs of EGDT to date
represent a cumulative total of over 3,000
patients. In these confirmatory studies, a
mean mortality prior to implementation
was 45.6 ± 7.9% (range 59.0 to 29.3%) and
25.8 ± 5.7% (range 29.0 to 18.0%) after
implementation of EGDT for an average
reduction of 19.6%, which is greater than the
original study of 16%.9, 61-72 In these studies
which were performed in both academic and
community hospital settings enrolled patients
with similar age and APACHE II scores
to the original trial. These studies provide
external validity EGDT is generalizable and
reproducible. While these implementation
programs may include additional therapies
such as aggressive hemodialysis, glucose
control, recombinant activated protein C,
corticosteroids and protective lung strategies,
multivariate analyses reveal the EGDT
contributes statistically significant mortality
benefit when compared to these other
interventions.71
Figure 3. Algorithm of early goal-directed therapy (EGDT)
patients.55-57 Furthermore, early fluid therapy has been shown
to decrease the release of inflammatory mediators.58 There
is a significant reduction in proinflammatory response that
accompanies EGDT therapy.59 The reduction in interleukin
8 in particular is accompanied by increased PaO2/FIO2 ratios
including improved lung function and decreased need for
mechanical ventilation. Similar findings in D-dimer activity
are noted in the coagulation cascade which is similar to that
seen with recombinant activated protein C.60 This may be one
of the plausible explanations for the decreased need for organ
support therapy such as mechanical ventilation, vasopressor
therapy, and hemodialysis in patients who received EGDT
versus standard care.
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Table 2. Early goal-directed therapy (EGDT)
decreases these components of care:
1. Mortality by 16-20%
2. Components of the inflammatory response
3. Morbidity of organ dysfunction
4. Need for vasopressor therapy
5. Need for mechanical ventilation
6. Sudden cardiopulmonary complications in
the first 24 hours
7. Length of hospital stay
8. Health care resource consumption
41
ADVANCING THE STANDARD OF CARE:
Cardiovascular, Neurovascular and Infectious Emergencies
Implementation Strategies of EGDT
EGDT represents one of the first ED based therapies shown
to improve outcome, however, it remains incompletely
practiced. The reasons range from ED overcrowding,
variation in skill levels among clinicians in the ED
setting, and the lack of understanding of the continuum
of care required to implement this therapy. A coordinated
patient care model similar to the treatment of AMI, stroke
and trauma is required. To achieve a consistent level of
quality at various locations within the hospital, multiple
models of care may be required. The first model of sepsis
management is ED based. A second and increasingly
popular model incorporates a multidisciplinary rapid
response team which utilizes mobile resources to care for
the patient irrespective of location.73 The third concept is
an ICU based model which rapidly transfers the patient
to the ICU where EGDT is performed in the ICU.63 Each
of these unique models must be tailored to the institution
(Figure 2).
A Cost Analysis of EGDT
EGDT can provide up to a 23.4% reduction in hospital
costs related to severe sepsis and septic shock.72 EGDT
is most cost-effective if patient volumes exceed sixteen
patients per year and irrespective of whether the care is
primarily provided by the ED, rapid response team, or the
ICU. This volume of patients is easily seen in a 200-bed
hospital. A mean reduction of 4 days per admission, or a
32.6% reduction in hospital length of stay, for survivors
and 13.9% reduction in PAC use (both p<0.03) were seen
in the EGDT study. Similar findings have been noted by
other investigators.64, 65
summary
EGDT results in significant reductions in morbidity,
mortality, vasopressor use, and health care resource
consumption. EGDT modulates some components of
inflammation, which is reflected by improved organ
function. The end-points used in the EGDT protocol,
outcome results and cost effectiveness have subsequently
been externally validated, revealing similar or even better
findings than the original trial. Adherence to the principles
of early recognition, early mobilization of resources,
and multidisciplinary collaboration is imperative if
improvements in the morbidity and mortality associated
with sepsis are to parallel those seen with other severe
disease states such as AMI, trauma and stroke.
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