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Shock, Distributive: Differential Diagnoses & Workup

Author: Lalit K Kanaparthi, MD, Fellow in Pulmonary Medicine, Lenox Hill Hospital
Coauthor(s): Klaus-Dieter Lessnau, MD, FCCP, Clinical Associate Professor of Medicine, New York University School of Medicine; Medical Director, Pulmonary Physiology Laboratory; Director of Research in Pulmonary Medicine, Department of Medicine, Section of Pulmonary Medicine, Lenox Hill Hospital; Ruben Peralta, MD, FACS, Professor of Surgery, Anesthesia and Emergency Medicine, Senior Medical Advisor, Board of Directors, Program Chief of Trauma, Emergency and Critical Care, Consulting Staff, Professor Juan Bosch Trauma Hospital, Dominican Republic; Sarah Guzofski, MD, Staff Physician, Department of Psychiatry, University of Massachusetts Medical School; Scott P Neeley, MD, Medical Director, Intensive Care Unit, St Alexius Medical Center; Consulting Staff, Chest Medicine Consultants
Contributor Information and Disclosures

Updated: Mar 4, 2009

Differential Diagnoses

Adrenal Crisis
Pulmonary Embolism
Anaphylaxis
Septic Shock
Cardiac Tamponade
Shock, Hemorrhagic
Cardiogenic Shock
Systemic Inflammatory Response Syndrome
Myocardial Infarction
Toxic Shock Syndrome
Myxedema Coma or Crisis
Toxicity, Cyanide
Pancreatitis, Acute

Other Problems to Be Considered

Burns
Carbon monoxide poisoning
Drug reaction
Heavy metal poisoning
Insect bite
Major surgery
Neurogenic shock
Thyrotoxicosis

Workup

Laboratory Studies

  • All patients with evidence of distributive shock should undergo the following studies:
    • CBC count with differential
    • Urinalysis
    • Electrolytes
    • BUN
    • Creatinine
    • Glucose
    • Urine cultures
    • Blood cultures
    • Arterial blood gas
    • Serum lactate if metabolic acidosis or elevated anion gap is present
  • If pneumonia is suspected, sputum Gram stain and culture should be performed.
  • All patients with a suspected intraabdominal pathologic condition or hepatic insufficiency should undergo the following studies:
    • Serum bilirubin
    • Alkaline phosphatase
    • Aspartate aminotransferase (AST), alanine aminotransferase (ALT)
    • Prothrombin time (PT)/activated partial thromboplastin time (aPTT)/ INR (International Normalized Ratio)
    • Amylase, lipase 
  • All patients with suspected disseminated intravascular coagulation (DIC) should undergo the following studies:
    • Obtain PT, aPTT, fibrin split products, D-dimer assay, fibrinogen level, and platelet count.
    • Examine peripheral blood smear for signs of erythrocyte microangiopathic changes, such as schistocytes.

Imaging Studies

Imaging studies may be integral to defining the source of infection and identifying areas in need of drainage. 

  • All patients should undergo chest radiography.
  • With the advent of CT scanning, the use of abdominal radiography has become less common in the diagnostic workup of shock. These studies may not be sensitive enough to reveal intra-abdominal pathologic conditions.
  • In suspected cases of cholecystitis or pancreatitis, abdominal ultrasound is most useful to assess for cholelithiasis, biliary dilatation, and fluid collections around the gallbladder or the head of the pancreas.
  • CT scanning is the diagnostic test of choice for suspected intra-abdominal cause of sepsis. Consider abdominal and pelvic CT scans with oral contrast and intravenous contrast if these sites are found to be clinically suspicious for infection.

Other Tests

  • EKG should be performed to examine for evidence of underlying cardiac pathologic conditions (left ventricular hypertrophy, cor pulmonale, low voltage, bundle branch block) or acute changes of ischemia or pericarditis.
  • Point-of-care ultrasonography/echocardiography may be performed at the bedside in the critically ill patients to evaluate the cardiac function, fluid status, response to hemodynamic intervention, and exclude tamponade.

Procedures

  • Lumbar puncture (LP) is indicated in patients with nuchal rigidity, headache, or unexplained neurologic findings or in patients with sepsis and altered level of consciousness without another apparent source of infection. A CT scan of the head should be performed prior to LP whenever feasible.
  • The use of pulmonary artery catheters (PACs) was the standard of care for decades; however, recent data suggest an increase in mortality with the use of PAC monitoring, calling this practice into question. Additionally, current parameters for PAC-guided resuscitation may not be appropriate. A recent randomized trial of the use of PACs in elderly high-risk surgical patients found no benefit to therapy directed by PACs compared with treatment per the standard of care.11,12 See Table 1
  • Table 1. Pulmonary Artery Catheter Findings in Common Shock States

    Open table in new window

    Table
    DiagnosisPulmonary Capillary  Wedge Pressure Cardiac Output
    Cardiogenic shock*IncreasedDecreased
    Extracardiac obstructive shock
    1. Pericardial tamponade†
    2. Pulmonary embolism
     Increased                                  Normal or decreased DecreasedDecreased
    Hypovolemic shockDecreasedDecreased
    Distributive shock
    1. Septic shock
    2. Anaphylactic shock
    Normal or decreased
    Normal or decreased
    Increased or normal
    Increased or normal
    DiagnosisPulmonary Capillary  Wedge Pressure Cardiac Output
    Cardiogenic shock*IncreasedDecreased
    Extracardiac obstructive shock
    1. Pericardial tamponade†
    2. Pulmonary embolism
     Increased                                  Normal or decreased DecreasedDecreased
    Hypovolemic shockDecreasedDecreased
    Distributive shock
    1. Septic shock
    2. Anaphylactic shock
    Normal or decreased
    Normal or decreased
    Increased or normal
    Increased or normal

*In cardiogenic shock due to a mechanical defect such as mitral regurgitation, forward cardiac output is reduced, although the measured cardiac output may be unreliable. Large V waves are commonly observed in the pulmonary capillary wedge tracing in mitral regurgitation.

†The hallmark finding is equalization of right atrial mean, right ventricular end-diastolic, PA end-diastolic, and pulmonary capillary wedge pressures.

  • Arterial catheter placement should be considered in hemodynamically unstable patients who are receiving continuous infusions of vasoactive drugs, or those patients requiring frequent arterial blood gas measurements (eg, patients on mechanical ventilation).
  • Transthoracic (TTE) and transesophageal echocardiography (TEE) may be used to estimate right atrial filling and right ventricular volumes in patients with undetermined fluid status.
    • TTE is a noninvasive method for the assessment of left ventricular function. This technique has several limitations: it is time consuming, operator dependent, and limited by pre-existing pulmonary disease or chest wall injuries.
    • TEE is a somewhat more invasive test that provides excellent structural information in the critically ill patient. This technique allows the assessment of preload, ventricular wall motion abnormalities, and the pericardium.
  • Other minimally invasive techniques include the following:
    • Thoracic bioelectrical impedance (TBI): This technique relies on formulas to estimate stroke volume and cardiac output based on the measured bioimpedance of blood velocity and volume of blood flow through the aorta.
    • PiCCO, LiCO, and FloTrac: Via an arterial catheter, cardiac output can be continuously monitored. FloTrac does not require calibration. Stroke volume and continuous systemic vascular resistance (SVR) can be measured and calculated using basic patient information.
    • Measurement of total circulating blood volume (TCBV) is measured using indocyanine green infusion and quantified using spectrophotometry.
    • Microcirculatory imaging techniques such as orthogonal polarization spectral and side-stream dark-field imaging have allowed direct observation of the microcirculation at the bedside. They have demonstrated different types of heterogenous flow patterns of microcirculatory abnormalities in different types of distributive shock and may complement the early goal-directed therapy in shock.

More on Shock, Distributive

Overview: Shock, Distributive
Differential Diagnoses & Workup: Shock, Distributive
Treatment & Medication: Shock, Distributive
Follow-up: Shock, Distributive
References

References

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Further Reading

Keywords

distributive shock, end-organ dysfunction, hypotension, systemic vascular resistance, SVR, septic shock, systemic inflammatory response syndrome, SIRS, toxic shock syndrome, TSS, anaphylaxis, drug reactions, toxin reactions, transfusion reaction, heavy metal poisoning, addisonian crisis, hepatic insufficiency, neurogenic shock

Contributor Information and Disclosures

Author

Lalit K Kanaparthi, MD, Fellow in Pulmonary Medicine, Lenox Hill Hospital
Lalit K Kanaparthi, MD is a member of the following medical societies: American College of Chest Physicians, American Medical Association, and American Thoracic Society
Disclosure: Nothing to disclose.

Coauthor(s)

Klaus-Dieter Lessnau, MD, FCCP, Clinical Associate Professor of Medicine, New York University School of Medicine; Medical Director, Pulmonary Physiology Laboratory; Director of Research in Pulmonary Medicine, Department of Medicine, Section of Pulmonary Medicine, Lenox Hill Hospital
Klaus-Dieter Lessnau, MD, FCCP is a member of the following medical societies: American College of Chest Physicians, American College of Physicians, American Medical Association, American Society for Artificial Internal Organs, American Thoracic Society, Physicians for Social Responsibility, and Society of Critical Care Medicine
Disclosure: sepracor Ownership interest None

Ruben Peralta, MD, FACS, Professor of Surgery, Anesthesia and Emergency Medicine, Senior Medical Advisor, Board of Directors, Program Chief of Trauma, Emergency and Critical Care, Consulting Staff, Professor Juan Bosch Trauma Hospital, Dominican Republic
Ruben Peralta, MD, FACS is a member of the following medical societies: American College of Surgeons, American Medical Association, Association for Academic Surgery, Eastern Association for the Surgery of Trauma, Massachusetts Medical Society, Society of Critical Care Medicine, and Society of Laparoendoscopic Surgeons
Disclosure: Nothing to disclose.

Sarah Guzofski, MD, Staff Physician, Department of Psychiatry, University of Massachusetts Medical School
Sarah Guzofski, MD is a member of the following medical societies: American Medical Association, American Psychiatric Association, and Massachusetts Medical Society
Disclosure: Nothing to disclose.

Scott P Neeley, MD, Medical Director, Intensive Care Unit, St Alexius Medical Center; Consulting Staff, Chest Medicine Consultants
Scott P Neeley, MD is a member of the following medical societies: American College of Chest Physicians, American College of Physician Executives, American College of Physicians, American Thoracic Society, Phi Beta Kappa, and Sigma Xi
Disclosure: Nothing to disclose.

Medical Editor

Cory Franklin, MD, Professor, Department of Medicine, Rosalind Franklin University of Medicine and Science; Director, Division of Critical Care Medicine, Cook County Hospital
Cory Franklin, MD is a member of the following medical societies: New York Academy of Sciences and Society of Critical Care Medicine
Disclosure: Nothing to disclose.

Pharmacy Editor

Francisco Talavera, PharmD, PhD, Senior Pharmacy Editor, eMedicine
Disclosure: Nothing to disclose.

Managing Editor

Daniel R Ouellette, MD, FCCP, Associate Professor of Medicine, Wayne State University School of Medicine; Consulting Staff, Pulmonary Disease and Critical Care Medicine Service, Henry Ford Health System
Daniel R Ouellette, MD, FCCP is a member of the following medical societies: American College of Chest Physicians and American Thoracic Society
Disclosure: Boehringer Ingleheim Honoraria Speaking and teaching; Pfizer Honoraria Speaking and teaching

CME Editor

Timothy D Rice, MD, Associate Professor, Departments of Internal Medicine and Pediatrics and Adolescent Medicine, Saint Louis University School of Medicine
Timothy D Rice, MD is a member of the following medical societies: American Academy of Pediatrics and American College of Physicians
Disclosure: Nothing to disclose.

Chief Editor

Michael R Pinsky, MD, CM, Professor of Critical Care Medicine, Bioengineering, Cardiovascular Diseases and Anesthesiology, University of Pittsburgh School of Medicine, University of Pittsburgh Medical Center
Michael R Pinsky, MD, CM is a member of the following medical societies: American College of Chest Physicians, American College of Critical Care Medicine, American Heart Association, American Thoracic Society, Association of University Anesthetists, Shock Society, and Society of Critical Care Medicine
Disclosure: LiDCO Ltd Honoraria Consulting; iNTELOMED Intellectual property rights Board membership; Edwards Lifesciences Honoraria Consulting; Applied Physiology, Ltd Honoraria Consulting; Cheetah Medical Consulting fee Consulting

 
 
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