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Shock
1.
2. Shock is a physiologic state characterized by
a significant reduction of systemic tissue
perfusion, resulting in decreased oxygen
delivery to the tissues.
3. cell membrane ion pump dysfunction
intracellular edema
leakage of intracellular contents into the
extracellular space
inadequate regulation of intracellular pH
4. alterations in the serum pH
endothelial dysfunction
redox state
further stimulation of inflammatory and
antiinflammatory cascades
5. sequential cell death
end-organ damage
multi-system organ failure
death.
Initially reversible
rapidly become irreversible
6. Cryptic = hidden or silent
Inadequate oxygen delivery leading to shock can
occur despite the patient being hypertensive or
normotensive and clinicians should not wait for
the presence of hypotension before aggressively
attempting to reverse shock and restore
adequate tissue perfusion.
Early evaluation of serum lactate can assist in
identifying “cryptic shock” (normal blood
pressure accompanied by tissue level
hypoperfusion).
7. Systemic tissue perfusion is determined by
the cardiac output (CO) and systemic vascular
resistance (SVR):
●CO is the product of heart rate and stroke
volume.
The stroke volume is related to preload,
myocardial contractility, and afterload
●SVR is governed by the vessel length, blood
viscosity, and vessel diameter
8. Decreased systemic tissue perfusion is a
consequence of diminished CO, SVR, or both. The
CO or SVR may be elevated in shock if the other
is disproportionately low.
As an example, SVR is decreased out of
proportion to the elevation of the CO in
hyperdynamic shock .
Complex interactions between humoral and
microcirculatory processes cause patchy regional
blood flow and reduced effective tissue perfusion
This results in derangement of cellular metabolic
processes.
10. ↓preload due to intravascular volume loss.
leading to ↓ CO & compensatory ↑SVR
↓ PCWP is decreased.
11. Due to severely decreased SVR.
Compensatory ↑CO
The PCWP may be low or normal
Septic
Adrenal crises
Neurogenic (spinal shock)
Anaphylactic
PCWP : DD hypovolemic from cardiogenic shock .
12. An example, in septic shock :
hypovolemic component (due to decreased
oral intake, insensible losses, vomiting,
diarrhea)
cardiogenic component (due to sepsis-
related myocardial dysfunction)
distributive component (due to the effects of
inflammatory and antiinflammatory cascades
on vascular permeability and vasodilation).
14. warm shock or compensated shock.
rapid compensatory homeostatic
mechanisms for diminished tissue perfusion
Signs : tachycardia, peripheral
vasoconstriction, and either a modest ↑ ↓
systemic blood pressure
15. Overwhelmed compensatory mechanisms
S/S signs of organ dysfunction appear.
tachycardia, dyspnea, restlessness, diaphoresis, metabolic
acidosis, oliguria, and cool clammy skin.
↓25% in effective arterial blood volume in hypovolemic shock
↓ cardiac index to ≤2.5 L/min/m2 in cardiogenic shock,
activation of innumerable mediators of the systemic
inflammatory response syndrome (SIRS) in distributive shock.
16. ⇊ urine output : ARF
Acidemia decreases the cardiac output and
alters cellular metabolic processes
restlessness evolves into agitation,
obtundation, and coma.
17. Hypotension
Oliguria
abnormal mental status
metabolic acidosis
in some patients, cool and clammy skin.
18. Hypotension occurs in the majority of shock patients.
absolute hypotension (eg, systolic BP<90 mmHg)
relative hypotension (eg, a drop in systolic BP>40 mmHg).
Relative hypotension explains, in part, why a patient may be
in shock despite having a high or normal BP.
22. early distributive shock prior to the onset of
compensatory vasoconstriction
terminal shock due to failure of compensatory
vasoconstriction.
23. ⇩ lactate clearance by liver, kidneys & skeletal muscle
Lactate production may increase due to anaerobic
metabolism if shock progresses to circulatory failure and
tissue hypoxia, which can worsen the acidemia.
24. – Depending upon the cause :
hematemesis, hematochezia, melena,
vomiting, diarrhea, or abdominal pain.
There may be evidence of blunt or
penetrating trauma,
The patient may be postoperative.
30. Massive PE
Tension pneumothorax
Severe constrictive pericarditis
Pericardial tamponade
Severe pulmonary hypertension: Eisenmenger's
They may present clinically as hypovolemic shock
when their primary physiologic disturbance is
decreased preload, rather than pump failure.
31. Resuscitative efforts should NOT be delayed
for history, physical examination, laboratory
testing, or imaging.
32. The patient's baseline medical status
recent complaints
food and medicine allergies
recent changes in medications, potential
acute or chronic drug intoxication
preexisting diseases
immunosuppressed states
hypercoagulable conditions.
34. CBC : leukocytosis and/orbandemia >10% (sepsis)
Basic chemistry (sodium, potassium, chloride, serum
bicarbonate)
RFT :urea & creatinine
liver function tests
amylase, lipase
INR, PTT
fibrinogen, fibrin split products or dimer, cardiac
enzymes (troponin or CK mb)
ABG
Toxicology screen
lactate level.
Type and crossmatch should be performed for
patients who are at risk for significant bleeding
35. Causes:
increased production ( anaerobic metabolism)
mitochondrial derangements affecting oxygen
utilization
decreased clearance due to hepatic dysfunction.
36. CXR
abdominal X-ray for intestinal obstruction
abdominal CT
ECG
Echocardiogram
urinalysis
Gram stain of material from sites of possible
infection (sputum, urine, wounds) may give early
clues to the etiology of infection while cultures are
incubating.
Blood should be taken from two distinct
venipuncture sites
37. Hemodynamic measurements
titration of vasopressors
guide fluid resuscitation
cardiac output
pulmonary artery occlusion pressure: PAWP
SVR
never been shown to improve outcomes
38. 35 to 60 %
higher in cardiogenic shock; 60 to 90 %