Vasopressors in septic shock
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1 Vasopressors in septic shock Prof. Jean-Louis TEBOUL Medical ICU Bicetre hospital University Paris-South France
2 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
3 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
4 Why do we use vasopressors in septic shock? Septic shock is characterized by a decreased vascular tone (inducible NO synthase activation, etc) Hypotension Hypoperfusion worsening
5 Autoregulation of organ blood flow organ blood flow mean arterial pressure
6 Why do we use vasopressors in septic shock? 1- Septic shock is characterized by a decreased vascular tone (inducible NO synthase activation, etc) 2- Profound hypotension worsens organ hypoperfusion and represents an independent risk of death
7 48 hrs 65 mmhg
8 mmhg Area under MAP 65 mmhg Time under MAP 65 mmhg Area under MAP 65 mmhg Best predictor of 30-day mortality
9 during the first 24 hours
10 Why do we use vasopressors in septic shock? 1- Septic shock is characterized by a decreased vascular tone (inducible NO synthase activation, etc) 2- Profound hypotension worsens organ hypoperfusion and represents an independent risk of death 3- Correction of hypotension with a vasopressor allows improving organ perfusion
11 Probable arterial pressure effect Urine flow (ml/h) Creatinine clearance Blood lactate (meq/l) * * * * * baseline 4 hrs 8 hrs 54 mmhg 73 mmhg 72 mmhg 0-2 hrs 4-6 hrs 54 mmhg 72 mmhg baseline 4 hrs 8 hrs 54 mmhg 73 mmhg 72 mmhg while cardiac output did not change
12 Autoregulation of renal blood flow renal blood flow mean arterial pressure
13 Why do we use vasopressors in septic shock? 1- Septic shock is characterized by a decreased vascular tone (inducible NO synthase activation, etc) 2- Profound hypotension worsens organ hypoperfusion and represents an independent risk of death 3- Correction of hypotension with a vasopressor allows improving organ perfusion and microcirculation
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15 % 95 StO 2 StO 2 : 75 ± 9% p < 0.05 healthy volunteers ± 4 * 55 before NE with NE
16 NIRS technology
17 StO 2 (%) Vascular Occlusion Test Inflation of the pneumatic cuff Deflation of the pneumatic cuff AUC Start point : 0.98 x baseline StO 2 Desaturation slope End point : 0.85 x baseline StO 2 Recovery slope Index of recruitment of microvessels Start point : 1.05 x minimal StO 2 Occlusion time Time
18 (%/s) 3.5 StO 2 recovery slope Restoration of a good MAP with early introduction of NE resulted in recruitment 1.5 p < 0.05 of microvessels and better tissue oxygenation before NE with NE
19 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
20 Vasopressors Norepinephrine as the first choice vasopressor (grade 1B)
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25 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
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27 SAP MAP DAP vasodilatation reflects the vascular tone low DAP Consider vasopressors When to start vasopressors? when MAP is < 65 mmhg despite adequate fluid resuscitation or when MAP is < 65 mmhg and DAP is low even if the patient has not been yet fully fluid resuscitated
28 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
29 Autoregulation of organ blood flow organ blood flow? 65 mmhg? mean arterial pressure
30 MAP: 65 mmhg MAP: 75 mmhg MAP: 85 mmhg % urine output capillary flow red cell velocity tonometry PCO 2 gap
31 Autoregulation of organ blood flow organ blood flow Mean Arterial Pressure (mmhg)
32 Crit Care Med 2000; 28: Crit Care Med 2005; 33: increasing MAP above 65 mmhg results in little benefit
33 Crit Care Med 2000; 28: Crit Care Med 2005; 33: MAP target value: 65 mmhg
34 Vasopressors Vasopressor therapy initially to target a MAP of 65 mmhg (grade 1C) Probably higher target value if: History of chronic hypertension
35 10 patients none with history of severe hypertension MAP: 65 mmhg MAP: 75 mmhg MAP: 85 mmhg % urine output capillary flow red cell velocity tonometry PCO 2 gap
36 Organ Blood flow no prior hypertension with prior hypertension 65 mmhg Mean arterial pressure
37 MAP Base Line 0 hr 6 hrs after the start of therapy Standard therapy 76 ± 24 EGDT 74 ± ± ± 19 * 2/3 patients had chronic hypertension
38 80-85 mmhg mmhg
39 Asfar et al. N Engl J Med 2014
40
41 Vasopressors Vasopressor therapy initially to target a MAP of 65 mmhg (grade 1C) Probably higher target value if: History of chronic hypertension Elevated CVP
42 Vasopressors Vasopressor therapy initially to target a MAP of 65 mmhg (grade 1C) Probably higher target value if: History of chronic hypertension Elevated CVP Elevated abdominal pressure Initial renal impairment
43 Pts without AKI at H 72 Pts with AKI at H 6 (n =101) Pts with AKI at H 72 Hourly MAP (mmhg) from H 1 to H 24
44 Pts without AKI at H 72 Pts without AKI at H 6 (n =116) Pts with AKI at H 72 Hourly MAP (mmhg) from H 1 to H 24
45 Is it dangerous to target a MAP value up to normal values (around 85 mmhg) in septic shock?
46 6 pts with septic shock Perfused Vessel Density No worsening but improvement of microcirculation for MAP target up to 85 mmhg with NE Microvascular Flow Index
47 Highly variable response among patients 20 pts with septic shock
48 20 pts with septic shock Perfused capillary density improved in pts with an altered sublingual perfusion at baseline, and decreased in patients with preserved basal microvascular perfusion.
49 Questions 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? 5- What to do in case of refractory hypotension?
50 Vasopressors Vasopressor therapy initially to target a MAP of 65 mmhg (grade 1C) Norepinephrine (NE) as the first choice vasopressor (grade 1B) Epinephrine (added to and substituted for NE) when an additional agent is needed to maintain adequate blood pressure (grade 2B) Vasopressin (0.03 units/min can be added to NE) with intent of either raising MAP or decreasing NE dosage)
51 Conclusion 1- Why do we use vasopressors in septic shock? 2- Which first-line agent? 3- When to start? 4- Which therapeutic target? at least 65 mmhg probably higher value if: History of chronic hypertension Elevated CVP Elevated abdominal pressure Initial renal impairment mmhg seems to be a safe range Thank you
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