Hypovolemic Shock

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Hypovolemic Shock

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Hypovolemic shock refers to a medical or surgical condition in which rapid fluid loss results in multiple organ failure due to inadequate circulating volume and subsequent inadequate perfusion.

Endothelium plays a critical role in vascular physiological, pathophysiological, and reparative processes. The functions of the endothelium are highly altered following hypovolemic shock due to ischemia of the endothelial cells and by reperfusion due to resuscitation with fluids. Due to oxygen deprivation, endothelial cell apoptosis is induced following hypovolemic shock. [1]

Most often, hypovolemic shock is secondary to rapid blood loss (hemorrhagic shock).

Acute external blood loss secondary to penetrating trauma and severe GI bleeding disorders are 2 common causes of hemorrhagic shock. Hemorrhagic shock can also result from significant acute internal blood loss into the thoracic and abdominal cavities.

Two common causes of rapid internal blood loss are solid organ injury and rupture of an abdominal aortic aneurysm. Hypovolemic shock can result from significant fluid (other than blood) loss. Two examples of hypovolemic shock secondary to fluid loss include refractory gastroenteritis and extensive burns. The remainder of this article concentrates mainly on hypovolemic shock secondary to blood loss and the controversies surrounding the treatment of this condition. The reader is referred to other articles for discussions of the pathophysiology and treatment for hypovolemic shock resulting from losses of fluid other than blood.

The many life-threatening injuries experienced during the wars of the 1900s have significantly affected the development of the principles of hemorrhagic shock resuscitation. During World War I, W.B. Cannon recommended delaying fluid resuscitation until the cause of the hemorrhagic shock was repaired surgically. Crystalloids and blood were used extensively during World War II for the treatment of patients in unstable conditions. Experience from the Korean and Vietnam wars revealed that volume resuscitation and early surgical intervention were paramount for surviving traumatic injuries resulting in hemorrhagic shock. These and other principles helped in the development of present guidelines for the treatment of traumatic hemorrhagic shock. However, recent investigators have questioned these guidelines, and today, controversies exist concerning the optimal treatment of hemorrhagic shock.

The prognosis is dependent on the degree of volume loss.

For patient education resources, see First Aid and Injuries Center, as well as Shock.

The human body responds to acute hemorrhage by activating the following major physiologic systems: the hematologic, cardiovascular, renal, and neuroendocrine systems.

The hematologic system responds to an acute severe blood loss by activating the coagulation cascade and contracting the bleeding vessels (by means of local thromboxane A2 release). In addition, platelets are activated (also by means of local thromboxane A2 release) and form an immature clot on the bleeding source. The damaged vessel exposes collagen, which subsequently causes fibrin deposition and stabilization of the clot. Approximately 24 hours are needed for complete clot fibrination and mature formation.

The cardiovascular system initially responds to hypovolemic shock by increasing the heart rate, increasing myocardial contractility, and constricting peripheral blood vessels. This response occurs secondary to an increased release of norepinephrine and decreased baseline vagal tone (regulated by the baroreceptors in the carotid arch, aortic arch, left atrium, and pulmonary vessels). The cardiovascular system also responds by redistributing blood to the brain, heart, and kidneys and away from skin, muscle, and GI tract.

The renal system responds to hemorrhagic shock by stimulating an increase in renin secretion from the juxtaglomerular apparatus. Renin converts angiotensinogen to angiotensin I, which subsequently is converted to angiotensin II by the lungs and liver. Angiotensin II has 2 main effects, both of which help to reverse hemorrhagic shock, vasoconstriction of arteriolar smooth muscle, and stimulation of aldosterone secretion by the adrenal cortex. Aldosterone is responsible for active sodium reabsorption and subsequent water conservation.

The neuroendocrine system responds to hemorrhagic shock by causing an increase in circulating antidiuretic hormone (ADH). ADH is released from the posterior pituitary gland in response to a decrease in BP (as detected by baroreceptors) and a decrease in the sodium concentration (as detected by osmoreceptors). ADH indirectly leads to an increased reabsorption of water and salt (NaCl) by the distal tubule, the collecting ducts, and the loop of Henle.

The pathophysiology of hypovolemic shock is much more involved than what was just listed. To explore the pathophysiology in more detail, references for further reading are provided in the bibliography. These intricate mechanisms list above are effective in maintaining vital organ perfusion in severe blood loss. Without fluid and blood resuscitation and/or correction of the underlying pathology causing the hemorrhage, cardiac perfusion eventually diminishes, and multiple organ failure soon follows.

Gulati A. Vascular endothelium and hypovolemic shock. Curr Vasc Pharmacol. 2016. 14(2):187-95. [Medline].

Pacagnella RC, Souza JP, Durocher J, et al. A systematic review of the relationship between blood loss and clinical signs. PLoS One. 2013. 8(3):e57594. [Medline]. [Full Text].

Sarkar D, Philbeck T. The use of multiple intraosseous catheters in combat casualty resuscitation. Mil Med. 2009 Feb. 174(2):106-8. [Medline].

Han J, Ren HQ, Zhao QB, Wu YL, Qiao ZY. Comparison of 3% and 7.5% hypertonic saline in resuscitation after traumatic hypovolemic shock. Shock. 2015 Mar. 43(3):244-9. [Medline].

Ghafari MH, Moosavizadeh SA, Moharari RS, Khashayar P. Hypertonic saline 5% vs. lactated ringer for resuscitating patients in hemorrhagic shock. Middle East J Anesthesiol. 2008 Oct. 19(6):1337-47. [Medline].

Reinhart K, Perner A, Sprung CL, et al. Consensus statement of the ESICM task force on colloid volume therapy in critically ill patients. Intensive Care Med. 2012 Mar. 38(3):368-83. [Medline].

Zink KA, Sambasivan CN, Holcomb JB, Chisholm G, Schreiber MA. A high ratio of plasma and platelets to packed red blood cells in the first 6 hours of massive transfusion improves outcomes in a large multicenter study. Am J Surg. 2009 May. 197(5):565-70; discussion 570. [Medline].

Burns B, Gentilello L, Elliot A, Shafi S. Prehospital hypotension redefined. J Trauma-Injury Infection and Crit Care. 2008 Dec. 65(6):1217-21. [Medline].

Dutton RP. Haemostatic resuscitation. Br J Anaesth. 2012 Dec. 109 Suppl 1:i39-i46. [Medline].

Dutton RP, Mackenzie CF, Scalea TM. Hypotensive resuscitation during active hemorrhage: impact on in-hospital mortality. J Trauma. 2002 Jun. 52(6):1141-6. [Medline].

Graham CA, Parke TR. Critical care in the emergency department: shock and circulatory support. Emerg Med J. 2005 Jan. 22(1):17-21. [Medline].

Khoshnevis J, Lotfollahzadeh S, Sobhiyeh MR, et al. Ruptured aneurysm of the splenic artery: a rare cause of abdominal pain after blunt trauma. Trauma Mon. 2013 Spring. 18(1):46-9. [Medline]. [Full Text].

Langley DM, Moran M. Intraosseous needles: they’re not just for kids anymore. J Emerg Nurs. 2008 Aug. 34(4):318-9. [Medline].

Montufar-Rueda C, Rodriguez L, Jarquin JD, et al. Severe postpartum hemorrhage from uterine atony: a multicentric study. J Pregnancy. 2013. 2013:525914. [Medline]. [Full Text].

Ogino R, Suzuki K, Kohno M, et al. Effects of hypertonic saline and dextran 70 on cardiac contractility after hemorrhagic shock. J Trauma. 1998 Jan. 44(1):59-69. [Medline].

Silbergleit R, Satz W, McNamara RM, et al. Effect of permissive hypotension in continuous uncontrolled intra-abdominal hemorrhage. Acad Emerg Med. 1996 Oct. 3(10):922-6. [Medline].

Skagius E, Siegbahn A, Bergqvist D, Henriksson A. Activated coagulation in patients with shock due to ruptured abdominal aortic aneurysm. Eur J Vasc Endovasc Surg. 2008 Jan. 35(1):37-40. [Medline].

Smith K, Deimling DL, Hinckley WR. Transporting the pregnant patient in shock; case report and review. Air Medical J. 2009 Jan-Feb. 28(1):37-9. [Medline].

Stern SA. Low-volume fluid resuscitation for presumed hemorrhagic shock: helpful or harmful?. Curr Opin Crit Care. 2001 Dec. 7(6):422-30. [Medline].

Yajima D, Motani H, Hayakawa M, Sato Y, Iwase H. A fatal case of hypovolemic shock after cesarean section. Am J Forensic Med Pathol. 2007 Sep. 28(3):212-5. [Medline].

Paul Kolecki, MD, FACEP Associate Professor, Department of Emergency Medicine, Director of Undergraduate Emergency Medicine Student Education, Thomas Jefferson University Hospital, Jefferson Medical College of Thomas Jefferson University; Consultant, Philadelphia Poison Control Center

Paul Kolecki, MD, FACEP is a member of the following medical societies: Alpha Omega Alpha, American College of Emergency Physicians

Disclosure: Nothing to disclose.

Carl R Menckhoff, MD, FACEP Regional Medical Officer for Dallas/Fort Worth, Adeptus Health

Carl R Menckhoff, MD, FACEP is a member of the following medical societies: American College of Emergency Physicians

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Received salary from Medscape for employment. for: Medscape.

A Antoine Kazzi, MD Deputy Chief of Staff, American University of Beirut Medical Center; Associate Professor, Department of Emergency Medicine, American University of Beirut, Lebanon

A Antoine Kazzi, MD is a member of the following medical societies: American Academy of Emergency Medicine

Disclosure: Nothing to disclose.

Barry E Brenner, MD, PhD, FACEP Professor of Emergency Medicine, Professor of Internal Medicine, Program Director for Emergency Medicine, Sanz Laniado Medical Center, Netanya, Israel

Barry E Brenner, MD, PhD, FACEP is a member of the following medical societies: Alpha Omega Alpha, American Academy of Emergency Medicine, American College of Chest Physicians, American College of Emergency Physicians, American College of Physicians, American Heart Association, American Thoracic Society, New York Academy of Medicine, New York Academy of Sciences, Society for Academic Emergency Medicine

Disclosure: Nothing to disclose.

Daniel J Dire, MD, FACEP, FAAP, FAAEM Clinical Professor, Department of Emergency Medicine, University of Texas Medical School at Houston; Clinical Professor, Department of Pediatrics, University of Texas Health Sciences Center San Antonio

Daniel J Dire, MD, FACEP, FAAP, FAAEM is a member of the following medical societies: American Academy of Clinical Toxicology, American Academy of Pediatrics, American Academy of Emergency Medicine, American College of Emergency Physicians, Association of Military Surgeons of the US

Disclosure: Nothing to disclose.

Hypovolemic Shock

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