LE3 Flashcards
- The following statements are true regarding cellular effects of shock except?
A. Decreased intracellular pH does not lead to changes in cellular gene expression, impair cellular metabolic pathways and impede cell membrane ion exchange
B. Decreased intracellular pH (intracellular acidosis) can alter the activity of cellular enzymes
C. Acidosis leads to cellular changes in calcium metabolism and calcium mediated cellular signaling which alone can interfere with the activity of specific enzymes and cell function
D. Changes in the normal cell function may progress to cellular injury or cell death
E. None of the above
A. Decreased intracellular pH does not lead to changes in cellular gene expression, impair cellular metabolic pathways and impede cell membrane ion exchange
A decrease in intracellular pH (acidosis) can indeed lead to changes in cellular gene expression, impair cellular metabolic pathways, and impede cell membrane ion exchange.
- The following hormones are increased in shock except:
A. Glucagon
B. Insulin
C. Cortisol
D. ADH
E. NOTA
B. Insulin
In the context of shock:
A. Glucagon: Increases in response to stress, promoting glycogenolysis and raising blood glucose levels.
B. Insulin: Typically, insulin levels decrease in response to acute stress or shock. The body prioritizes increasing blood glucose levels to provide energy for essential organs and tissues during these conditions. Elevated glucagon, cortisol, and other counterregulatory hormones inhibit insulin secretion and action.
C. Cortisol: Increases in response to stress. It is a major stress hormone released from the adrenal cortex and plays a role in increasing blood glucose levels, among other effects.
D. ADH (Antidiuretic hormone): Also known as vasopressin, it increases in shock. It promotes water reabsorption in the kidneys and vasoconstriction, both of which help to raise blood pressure.
- Activated PMNs generate and release a number of substances that may induce cell or tissue injury. Except?
A. Cathepsin G
B. Elastase
C. Leukotrienes
D. Platelet- Activating Factor
E. None of the above
E. None of the above
Polymorphonuclear leukocytes (PMNs) or neutrophils play a vital role in the body’s defense against infections. When activated, PMNs release various substances that help in the killing and digestion of microbes. However, in some conditions, especially in excessive or inappropriate activation, these substances can induce tissue injury.
Let’s evaluate each substance:
A. Cathepsin G: It’s a serine protease released by neutrophils that can degrade extracellular matrix proteins, contributing to tissue damage.
B. Elastase: It’s another protease released by neutrophils. It can degrade elastin and other tissue components, leading to tissue injury.
C. Leukotrienes: These are lipid mediators produced by leukocytes, including neutrophils. They are involved in inflammation and can contribute to tissue damage and inflammation.
D. Platelet-Activating Factor (PAF): It’s a phospholipid mediator that can be produced by various cells, including neutrophils. PAF can stimulate platelet aggregation, induce inflammation, and contribute to tissue damage.
4 Agitated patient including cool clammy extremities, tachycardia, weak or absent peripheral pulses, and hypotension. This type of shock results from at least how much blood loss?
A. >40%
B. 30-40%
C. 25-30%
D. 15-25%
E. <15%
B. 30-40%
Clinical signs of shock:
o Agitation
o Cool clammy extremities
o Tachycardia
o Week or absent peripheral pulses
o Hypotension (atleast 25% of blood loss)
Classification of Hemorrhagic Shock:
1. Class I (Loss of up to 15% of blood volume):
* Little to no change in vital signs.
* Pulse and blood pressure remain near baseline.
* Symptoms are usually minimal or absent.
2. Class II (Loss of 15-30% of blood volume):
* Mild tachycardia.
* Slight hypotension might be present.
* Increased heart rate, but still compensatory and not severe.
3. Class III (Loss of 30-40% of blood volume):
* Significant tachycardia.
* Notable hypotension.
* Decreased urinary output.
* Cool, clammy skin.
* Changes in mental status might start to be evident.
4. Class IV (Loss of more than 40% of blood volume):
* Marked tachycardia and hypotension.
* Profound shock with severe alterations in mental status.
* Minimal to no urine output.
* Cold and clammy extremities.
- A 30 y/o male after sustaining motorcycle crush injury presented at the ER with VS of BP 80/50, HR 120, RR 24. Where are the potential sources of massive hemorrhage EXCEPT?
A. intrathoracic
B. intraabdominal
C. intracranial
D. long bones
E. retroperitoneal
C. intracranial
- The following statements are true EXCEPT?
A. Diagnostic and therapeutic tube thoracostomy may be indicated in stable patients based on clinical findings and clinical suspicion
B. Each pleural cavity can hold 2 to 3 L of blood and can therefore be a site of significant blood loss.
C. Major retroperitoneal hemorrhage typically occurs in association with pelvic fractures
D. Findings with intra- abdominal hemorrhage include abdominal distension, abdominal tenderness, or visible abdominal wounds
E. None of the above
E. None of the above
7.The following statements are true regarding IL-1B except?
A. augments the secretion of ACTH, glucocorticoids, and beta-endorphins
B. stimulate the release of other cytokines such as interleukin-2 (IL-2), interleukin-4 (IL-4), interleukin-6 (IL-6), interleukin-8 (IL-8)
C. A and B
D. produces a febrile response to injury by activating prostaglandins in the posterior hypothalamus
E. half-life 60 minutes
E. half-life 60 minutes
- The renin-angiotensin system is activated in shock. Which of the following conditions will cause release of renin from juxtaglomerular cells of the kidneys?
A. Beta-adrenergic stimulation
B. Increased renal tubular sodium concentration
C. Decreased renal artery perfusion
D. A and D
E. All of the above
E. All of the above
- Which among the products of the renin angiotensin system is considered both a potent vasoconstrictor of splanchic and peripheral beds as well as secretion of ADH?
A. Angiotensin 1
B. Angiotensin 2
C. Renin
D. Angiotensinogen
E. Aldosterone
B. Angiotensin 2
- The ff. are true statements regarding the treatment of septic shock, EXCEPT?
A. Evaluation of patient in septic shock begins with an assessment of the adequacy of their airway and ventilation
B. Vasopressors as necessary
C. Intravenous fluid
D. Antibiotics must be started after results of culture and sensitivity comes out
E. Evaluation of the patient in septic shock begins with an assessment of their airway and ventilation
D. Antibiotics must be started after results of culture and sensitivity comes out
A. Evaluation of patient in septic shock begins with an assessment of the adequacy of their airway and ventilation
B. Vasopressors as necessary (Catecholamines/ Arginine Vasopressin)
C. Intravenous fluid (Fluid resuscitation and restoration of circulatory volume w/ balanced salt solution - at least 30 mL/kg w/ the first 4-6 hrs)
D. Antibiotics must be started after results of culture and sensitivity comes out (Broad-spectrum, empiric even w/o isolated bacteria)
E. Evaluation of the patient in septic shock begins with an assessment of their airway and ventilation
11 Hypoperfusion and hypoxia can induce cell death by apoptosis
A. TRUE
B. FALSE
A. TRUE
12 the intestinal mucosa cells apoptosis may compromise bowel integrity and lead to translocation of bacteria and endotoxins into the portal circulation during shock
A. TRUE
B. FALSE
A. TRUE
During shock, there can be decreased perfusion to various organs, including the intestines. Reduced blood flow to the intestines can result in injury to the intestinal mucosa. This injury can cause apoptosis (programmed cell death) of the mucosal cells.
When the integrity of the intestinal mucosa is compromised, there’s an increased risk of bacteria and endotoxins from the intestines entering the bloodstream, specifically the portal circulation. This phenomenon is known as bacterial translocation, and it can lead to systemic inflammatory responses and sepsis.
- patients who fail to respond to initial resuscitative efforts should be assumed to have ongoing active hemorrhage from large vessels and require extensive diagnostic tests.
A. TRUE
B. FALSE
B. FALSE
The statement implies that if a patient does not respond to initial resuscitative efforts, the automatic assumption should be ongoing active hemorrhage from large vessels and that they should undergo extensive diagnostic tests.
While ongoing active hemorrhage from large vessels is a possibility in patients who don’t respond to initial resuscitation, it’s not the only possibility. Other causes, such as cardiac tamponade, tension pneumothorax, or severe traumatic brain injury, among others, could also contribute to the failure of resuscitative measures.
Moreover, the term “extensive diagnostic tests” is quite broad. While it’s essential to identify the cause of shock quickly, not every patient may need “extensive” tests. What’s crucial is that the tests and interventions are appropriate to the clinical scenario.
- hypoxia inhibits the production of erythrocyte 2, 3 diphosphoglycerate (2,3DG)
A. True
B. False
B. False
2,3-diphosphoglycerate (2,3-DPG) plays a crucial role in the oxygen-binding curve of hemoglobin. An increase in its concentration within erythrocytes makes hemoglobin release oxygen more readily to the tissues.
When tissues experience hypoxia, one of the compensatory mechanisms is to increase the production of 2,3-DPG within erythrocytes. This increase ensures that more oxygen is offloaded from hemoglobin to the tissues, where it’s needed.
Innate immune response can help restore homeostasis, or if it is excessive, promote cellular and organ dysfunction
A. True
B. False
A. True
- Activation of the complement cascade can contribute to the development of organ dysfunction.
A. True
B. False
A. True
18.Magnitude of the oxygen debt correlates with the severity and duration of hypoperfusion.
A. True
B. False
A. True
19.Activated Complement factors C3a, C4a, and C5a are potent mediators of increased vascular permeability, smooth muscle contraction, histamine, and arachidonic acid by product release and adherence of neutrophils to vascular endothelium.
A. True
B. False
A. True
- Activated PMNs and their products cannot produce cell injury and organ dysfunction.
A. True
B. False
B. False
- In the nontrauma pt. with shock, the gastrointestinal tract must always be considered as a site for blood loss
A. True
B. False
A. True
Non-trauma: GIT must always be considered
o Upper or Lower GIT bleeding
o With hematemesis or bleeding
o Hx & PE is important
- Play a role in the development of diffuse alveolar damage and ARDS
A. TNF-a
B. IL-1 B
C. IL-6
D. IL-10
C. IL-6
- Produced by activated T cells
A. IL-2
B. TNF-a
C. IL-1b
D. IL-6
E. IL-10
A. IL-2
- Very short half life of 6 minutes
A. IL-10
B. IL-6
C. TNF-a
D. IL-1b
D. IL-1b
- Anti inflammatory cytokine that may have immunosuppressive properties
A. IL-10
B. IL-2
C. IL-6
D. IL-1b
A. IL-10