Upload
ngodieu
View
216
Download
0
Embed Size (px)
Citation preview
Eleana M. Zamora, MDAssistant Professor of MedicineDivision of Pulmonary, Critical Care, and Sleep
Be able to define SIRS, sepsis, severe sepsis, and septic shockDescribe the epidemiology of sepsisDescribe patients who are at risk for sepsisList the main treatment goals for septic shock
*Sands KE et al. JAMA. 1997;278:234‐40; §Murphy SL. National Vital Statistics Reports.
‡Angus DC et al. Crit Care Med. 2001;29:S109.
Major cause of morbidity and mortality worldwide• Leading cause of death in noncoronary ICUs (US)*• 11th leading cause of death overall (US) †§
More than 750,000 cases of severe sepsis in US annually‡
In the US, more than 500 patients die of severe sepsis daily‡
Sepsis accounts for 40% ICU expendituresSepsis cases increasing @ 1.5% yearly
Used with permission, S.Simpson, MD, KU, 2008
Body’s response to infection
Is a medical emergencySepsis causes interruption of normal blood flow and oxygenation to organs
UNM: about 35% of all deaths on Medicine service coded for sepsis or infection as primary cause of death
Condition Prevalence Deaths Mortality
AMI (1) 900,000 225,000 25%Stroke (2) 700,000 163,500 23%Trauma (3)
(Motor Vehicle)2.9 million 42,643 1.5%
Severe Sepsis (4)
751,000 215,000 29%
Source: (1) Ryan TJ, et al. ACC/AHA Guidelines for management of patients with AMI. JACC. 1996; 28: 1328-1428. (2) American Heart Association. Heart Disease and Stroke Statistics –2005 Update. Available at: www.americanheart.org. (3) National Highway Traffic Safety Administration. Traffic Safety Facts 2003: A Compilation of Motor Vehicle Crash Data from the Fatality Analysis Reporting System and the General Estimates System. Available at http://www.nhtsa.dot.gov/. (4) Angus DC et al. Crit Care Med 2001;29(7): 1303-1310.
Angus DC, et al. Crit Care Med. 2001.
Age (y)
<1 1-4
5-9
10-1
415
-19
20-2
425
-29
30-3
435
-39
40-4
445
-49
50-5
455
-59
60-6
465
-69
70-7
475
-79
80-8
4 85
Inci
denc
e (p
er 1
000
pop)
0
5
10
15
20
25
30Cases Incidence
0
20,000
40,000
60,000
80,000
100,000
120,000
No.
of C
ases
>
Sepsis: A Deadly Continuum
A clinical response arising from a nonspecific insult, with ≥2 of the following:• T >38oC or <36oC• HR >90 beats/min• RR >20/min• WBC >12,000/mm3 or <4,000/mm3 or >10% bands
SIRS with apresumedor confirmed infectiousprocess
Chest 1992;101:1644.
SepsisSIRSSevere Sepsis
SepticShock
Sepsis with organ
dysfunction
RefractoryHypotensionRelated toSepsis
Widespread inflammatory response to a variety of severe clinical insults
Clinically recognized by the presence of 2 or more of the following:
Temperature >38 C or < 36 CHeart Rate >90Respiratory Rate > 20 or PaCO2 <32WBC > 12,000, < 4000 or > 10% immature forms
SIRS criteria + evidence of infection
White cells in normally sterile body fluidPerforated viscusRadiographic evidence of pneumoniaSyndrome associated with a high risk of infection (HIV, neutropenia, etc)
Sepsis + evidence of organ dysfunction:
CV: mottled skin, left heart failureNeuro: Change in mental statusRenal: Urine output < 0.5 ml/kg body weight/hr for 1 hour despite volume resuscitationPulmonary: PaO2/FiO2 < 250 if other organ dysfunction present or < 200 if the lung is the only dysfunctional organHematologic: DIC, Platelet count < 80K or decreased by 50% in 3 daysMetabolic: pH < 7.3 and plasma lactate > 1.5 x upper normal
Severe sepsis + hypotension
MAP < 60 despite adequate fluid resuscitationUse of pressors
Adapted from: Bone RC et al. Chest. 1992;101:1644‐55.Used with permission, S.Simpson, MD, KU, 2008
SevereSepsis
Trauma
Infection
Sepsis Other
Pancreatitis
Burns
SIRS
Prospectively enrolled 2527 patients who met SIRS criteriaFollowed for 28 days or discharge for development of any stage of the sepsis continuum
Incidence (No. pts, (%)) Mortality (%)
No progression 1301 (52%) 7%
Sepsis 649 (26%) 16%
Severe Sepsis 467 (18%) 20%
Septic Shock 110 (4%) 46%
Rangel‐Frausto MS, et.al. JAMA 273:117‐23, 1995
Severe Sepsis: Mortality 20‐35%
Septic shock: Mortality 40‐60%
Global Tissue Hypoxia
Increased MetabolicDemands
Hypovolemia VasodilationMyocardial Depression
Microvascular AlterationsO2 DeliveryO2 Demand
After Fink. Crit Care Clin 2002.Used with permission, S.Simpson, MD, KU, 2008
NormalLow arterial pressure causes systemic vascular smooth muscle vasconstriction (high SVR)Examples: cardiogenic shock, hemorrhagic shock
SepsisCytokines, NO, etc cause peripheral vasodilation(low SVR)Low BP (hypotension) and low SVR
TachycardiaHypotension
OliguriaAnuria
↑ Creatinine
↓ Platelets↑ PT/APTT↓ Protein C↑ D-dimer
Altered Consciousness
ConfusionPsychosis
TachypneaPaO2 <70 mm Hg
SaO2 <90%PaO2/FiO2 ≤300
Jaundice↑ Enzymes↓ Albumin
↑ PT
Lactic acidosis
Used with permission, S.Simpson, MD, KU, 2008
CirculationHypotension, increases in microvascular permeability
LungPulmonary Edema, hypoxemia
GI tractTranslocation of bacteria, Liver Failure
Nervous SystemEncephalopathy, Critical Illness Polyneuropathy
KidneyAcute Tubular Necrosis, renal failure
Patients with positive blood cultures (septicemia, bacteremia)
Comorbidities causing host‐defense depression: AIDS, renal or liver failure, neoplasms, chronic immunosuppression, diabetes
Middle‐aged, elderly
Very young, very oldWeakened immune systemWound or injuries (burns, car accidents)Alcohol or other drug abuseIndwelling devices
Central lines, foley catheters, wound vacsGenetic factorsHospital factors
Nosocomial infections, antibiotic resistance
AntibioticsIV Fluids Vasoactive agents (pressors)Source control
Steroid therapy ? (adrenal insufficiency)Ventilatory strategiesGlycemic controlPrevention of secondary infections
Early aggressive fluid resuscitationAntibiotics earlyBP support (Dopamine, vasopressin, norepinephrine)? Hydrocortisone for adrenal insufficiencyGlycemic control (blood sugars)
6 Hour Sepsis Bundle1. Measure serum lactate2. Blood cultures prior to Abx3. Broad spectrum Abx (3hrs)4. If hypotensive or lactate>4
Fluid bolusVasopressors for MAP> 65
5. If persistent BP<65 or Lactate >4
Achieve CVP>8SVO2 >65
24 Hour Bundle1. ? Steroids as needed2. APC if indicated (no
longer recommended)3. Tight glycemic control4. ARDSnet ventilator
protocol
EGDT: Early Goal Directed Therapy
Use is evidence‐based:• Combine multiple elements known to be effective
• Outcome is additive or synergistic• Framework that leverages change• Avoids a piecemeal approach
Gao, et al. Critical Care 2005, 9:R764‐R770.With Permission from S. Simpson, MD,, Kansas University, 2008
The Importance of Early Goal-DirectedTherapy for Sepsis Induced Hypoperfusion
Adapted from Table 3, page 1374, with permission from Rivers E, Nguyen B, Havstad S, et al. Early goal-directed therapy in the treatment of severe sepsis and septic shock. N Engl J Med2001; 345:1368-1377
In-hospital mortality
(all patients)
0
10
20
30
40
50
60 Standard therapyEGDT
28-day mortality
60-day mortality
NNT to prevent 1 event (death) = 6-8M
orta
lity
(%)
3 pathways
Green (sepsis)
Yellow (severe sepsis, lactate 2-4)
Red (severe sepsis or septic shock)
Address cause: Treat infection
Intravascular volume resuscitation
Cardiovascular support
Support of dysfunctional organ systems
The Importance of Early Goal‐DirectedTherapy for Sepsis Induced Hypoperfusion
Adapted from Table 3, page 1374, from Rivers E, Nguyen B, Havstad S, et al. Early goal‐directed therapy in the treatment of severe sepsis and septic shock. N Engl J Med 2001; 345:1368‐1377
In-hospital mortality
(all patients)
0
10
20
30
40
50
60 Standard therapyEGDT
28-day mortality
60-day mortality
NNT to prevent 1 event (death) = 6-8M
orta
lity
(%)
Abx within 1 hr hypotension: 79.9% survivalSurvival decreased 7.6% with each hour of delayMortality increased by 2nd hour post hypotension Time to initiation of antibiotics was the single strongest predictor of outcome
Inappropriate antibiotic therapy is bad
20% of patients receive inappropriate therapySurvival of those with appropriate therapy 52%Survival of inappropriate therapy 10%
Adequate fluid resuscitation (quickly)How to gauge?
CVPFluid responsivenessCVPSVVPassive leg raiseLactate levels
EGDT is designed to:
Recognize patients with severe sepsis as early as possible and begin treatment quickly
Assess laboratory and hemodynamic variables for acute organ dysfunction
Delineate time targets for delivery of treatment of patients with sepsis
Develop hospital‐specific bundled protocols
Earlier treatment leads to better outcomes
EGDT is designed to:
Recognize patients with severe sepsis as early as possible and begin treatment quickly
Assess laboratory and hemodynamic variables for acute organ dysfunction
Delineate time targets for delivery of treatment of patients with sepsis
Develop hospital‐specific bundled protocols
Earlier treatment leads to better outcomes
• Mortality improvement
• Bundled protocols improve outcomes• But not all individual bundle elements have been
shown to specifically improve mortality• Early and appropriate antibiotics
• Aggressive fluid resuscitation improve outcomes