Diagnostic Considerations

Conditions to consider in the differential diagnosis of distributive shock include the following:

Anaphylaxis
Burns
Carbon monoxide poisoning
Drug reaction
Heavy metal poisoning
Insect bite
Major surgery
Neurogenic shock
Thyrotoxicosis
Toxic shock syndrome (TSS)
Cyanide toxicity
Thrombotic thrombocytopenic purpura (TTP)

Differential Diagnoses

Workup

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Media Gallery

An 8-year-old boy developed septic shock secondary to Blastomycosis pneumonia. Fungal infections are a rare cause of septic shock.
A 28-year-old woman who was a previous intravenous drug user (human immunodeficiency virus [HIV] status: negative) developed septic shock secondary to bilateral pneumococcal pneumonia.
Microcirculatory abnormalities in distributive shock. Each image represents a venule (large, curved tube) and 2 capillaries (smaller tubes) and demonstrates the 2 main capillary flow patterns found in each class of microcirculatory abnormality, as they occur in distributive shock. This classification system was introduced by Elbers and Ince. Elbers P, Ince C. Bench-to-bedside review: mechanisms of critical illness—classifying microcirculatory flow abnormalities in distributive shock. Crit Care. July 19 2006;10(4):221.
Ultrasound clip demonstrating a collapsing inferior vena cava (IVC) on inspiration. A change in IVC diameter with respiration of at least 12-18% has been associated with fluid responsiveness (defined as an increase in cardiac output of >15% after a fluid bolus).
Lung ultrasound image over one lung zone showing the A-line pattern. This represents normal aeration and absence of pulmonary edema. A patient who demonstrates this pattern in conjunction with an inferior vena cava diameter that shows respirophasic variation of at least 12-18% will likely be fluid responsive.

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Table 1. Pulmonary Artery Catheter Findings in Common Shock States

Diagnosis	Pulmonary Capillary Wedge Pressure	Cardiac Output
Cardiogenic shock*	Increased	Decreased
Extracardiac obstructive shock 1. Pericardial tamponade† 2. Pulmonary embolism	Increased Normal or decreased	Decreased Decreased
Hypovolemic shock	Decreased	Decreased
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, pulmonary artery (PA) end-diastolic, and pulmonary capillary wedge pressures.

Table 2. Vasoactive Drugs in Sepsis and the Usual Hemodynamic Responses

Drug	Dose	Principal Mechanism	Cardiac Output	Blood Pressure	SVR
Inotropic agents
Dobutamine	2-20 mcg/kg/min	Beta 1	++	+	+
Dopamine (low dose)	5-10 mcg/kg/min	Beta 1, dopamine	++	+	+
Epinephrine (low dose)	0.06-0.20 mcg/kg/min	Beta 1, beta 2 >alpha	++	+	+
Inotropic agents and vasoconstrictors
Dopamine (high dose)	>10 mcg/kg/min	Alpha, beta 1, dopamine	++	++	+
Epinephrine (high dose)	0.21-0.42 mcg/kg/min	Alpha >beta 1, beta 2	++	++	+
Norepinephrine	0.02-0.25 mcg/kg/min	Alpha >beta 1, beta 2	+	++	++
Vasoconstrictors
Synthetic human angiotensin II	20 ng/kg/min; up to 80 ng/kg/min during first 3 h of therapy Maintenance: 1.25-40 ng/kg/min	Renin-angiotensin-aldosterone system (RAAS)	+/-	++	+/-
Phenylephrine	0.2-2.5 mcg/kg/min	Alpha	+	++	++
Vasopressin	0.10-0.40 U/min	V1 receptor	+	+	++
Vasodilators
Dopamine (very low dose)	1-4 mcg/kg/min	Dopamine	+/-	+/-	-
Milrinone	0.4-0.6 mcg/kg/min after loading dose; 50 mcg/kg bolus over 5 min	Phosphodiesterase inhibitor	+	+/-	-
Alpha and beta refer to agonist activity at these adrenergic receptor sites. Beta 1-adrenergic effects are inotropic and increase contractility. Beta 2-adrenergic effects are chronotropic.^[58]

Table 3. Empiric Antimicrobial Therapy in Septic Shock Based on Suspected Site of Infection

Suspected Source	Recommended Antibiotic Therapy	Alternative Therapy
No source evident in a healthy host	Third-generation cephalosporin, eg, ceftriaxone 2 g IV q12h, ceftizoxime, ceftazidime	Nafcillin and aminoglycoside, imipenem, piperacillin/tazobactam
No source evident in an immunocompromised host	Ceftazidime 2 g IV q8h plus aminoglycoside	Imipenem or piperacillin/tazobactam plus aminoglycoside
No source evident in a user of intravenous drugs	Nafcillin 2 g IV q4h plus aminoglycoside	Vancomycin plus aminoglycoside, ceftazidime, imipenem, or piperacillin/tazobactam
Bacterial pneumonia, community acquired	Ceftriaxone 2 g IV q12-24 h plus macrolide	Levofloxacin 750mg IV q24h, cotrimoxazole or imipenem plus macrolide
Bacterial pneumonia, hospital acquired	Piperacillin/tazobactam 4.5 g IV q6h plus aminoglycoside, plus levofloxacin 750 mg IV q24h	Imipenem plus aminoglycoside, plus macrolide
Urinary tract infection	Ampicillin 2 g IV q4h plus aminoglycoside	Fluoroquinolone or third-generation cephalosporin plus aminoglycoside
Mixed aerobic and anaerobic abdominal sepsis, aspiration pneumonia, pelvic infection, and necrotizing cellulitis	Third-generation cephalosporin or ampicillin 2 g IV q4h plus aminoglycoside plus clindamycin 600 mg IV q8h or metronidazole 500 mg IV q6h	Fluoroquinolone plus clindamycin, imipenem, piperacillin/tazobactam
Meningitis	Ceftriaxone 2 g IV q12h plus vancomycin	Meropenem plus vancomycin, chloramphenicol plus cotrimoxazole plus vancomycin
Cellulitis/erysipelas	Nafcillin 2 g IV q4h	Cefazolin, vancomycin, clindamycin
Toxic shock syndrome (TSS) or streptococcal necrotizing fasciitis	Clindamycin 600 mg IV q8h	Cephalosporin, vancomycin, nafcillin

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Author

Klaus-Dieter Lessnau, MD, FCCP Former 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 Thoracic Society, Society of Critical Care Medicine

Disclosure: Nothing to disclose.

Coauthor(s)

Kevin Gerard G Lazo, DO Attending Hospitalist, Division of Hospital Medicine, Department of Medicine, Northwell Health; Assistant Professor of Medicine, Donald and Barbara Zucker School of Medicine at Hofstra/Northwell

Kevin Gerard G Lazo, DO is a member of the following medical societies: American College of Physicians, American Thoracic Society

Disclosure: Nothing to disclose.

Oki Ishikawa, MD Chief Resident Physician, Department of Internal Medicine, Lenox Hill Hospital, Northwell Health

Disclosure: Nothing to disclose.

Ruben Peralta, MD, FACS, FCCM, FCCP Deputy Trauma Medical Director, Professor and Director of Trauma, Emergency and Critical Care Fellowship Program, Senior Consultant in Surgery, Trauma, Emergency and Critical Care Medicine, Associate Director of Trauma Intensive Care Unit, Hamad General Hospital and Hamad Medical Corporation, Weill Cornell Medical College in Qatar

Ruben Peralta, MD, FACS, FCCM, FCCP is a member of the following medical societies: American Association of Blood Banks, American College of Healthcare Executives, 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, Society of Laparoendoscopic Surgeons

Disclosure: Nothing to disclose.

Chuan Jiang, MD Physician, Lenox Hill Hospital, Northwell Health

Chuan Jiang, MD is a member of the following medical societies: American College of Physicians, Society of Hospital Medicine

Disclosure: Nothing to disclose.

Chief Editor

Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM Professor of Critical Care Medicine, Bioengineering, Cardiovascular Disease, Clinical and Translational Science and Anesthesiology, Vice-Chair of Academic Affairs, Department of Critical Care Medicine, University of Pittsburgh Medical Center, University of Pittsburgh School of Medicine

Michael R Pinsky, MD, CM, Dr(HC), FCCP, FAPS, MCCM is a member of the following medical societies: American College of Chest Physicians, American College of Critical Care Medicine, American Thoracic Society, European Society of Intensive Care Medicine, Society of Critical Care Medicine

Disclosure: Received income in an amount equal to or greater than $250 from: Baxter Medical, Exostat, LiDCO<br/>Received honoraria from LiDCO Ltd for consulting; Received intellectual property rights from iNTELOMED.

Additional Contributors

Lalit K Kanaparthi, MD Attending Physician, North Florida Lung Associates

Lalit K Kanaparthi, MD is a member of the following medical societies: American College of Chest Physicians, American Medical Association, American Thoracic Society

Disclosure: Nothing to disclose.

Acknowledgements

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.

Sarah C Langenfeld, MD Assistant Professor, Department of Psychiatry, University of Massachusetts Medical School; Attending Psychiatrist, Community HealthLink

Sarah Langenfeld, 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

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.

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: 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: Medscape Salary Employment