The practical and scientific approach for Hypotensive patient

Blood pressure (BP) = Cardiac output (CO) x systematic vascular resistance (SVR)
	IS CO REDUCED?
	Yes	No
BP	90/70 mm Hg	90/40 mm Hg
Skin	Cool, blue	Warm, pink
Nail bed return	Slow	Rapid
Heart sounds	Muffled	Crisp
History/lab	Hypervolemic or cardiogenic etiology	or WBC and/or temperature
		Source of infection
		Immune compromise
		Severe liver disease
Working diagnosis	See next question	Septic shock/endotoxemia
	IS THE HEART TOO FULL?
	Yes	No
Presentation	Angina, dyspnea	Hemorrhage, dehydration
Signs	Cardiomegaly	Dry mucous membranes
	Extra heart sounds	tissue turgor
	JVP	Stool, gastric blood
Lab	ECG, x-ray	hematocrit
	Echocardiogram	BUN/creatinine
Working diagnosis	Cardiogenic shock	Hypovolemic shock
	WHAT DOES NOT FIT?
	Cardiac tamponade	Anaphylaxis
	Acute pulmonary hypertension	Spinal shock
	Right ventricular infarction	Adrenal insufficiency
	Overlapping multiple etiologies

Comments

The pressure volume loop...

In the pressure-volume loop below, cardiac work is best represented by: the area of the curve the slope of the line from points C to D the distance of the line from points C to D the slope of a line from points A to D .. .. ... .... ... .... .... .... In the pressure-volume loop below, cardiac work is best represented by: the area of the curve Cardiac work is the product of pressure and volume and is linearly related to myocardial oxygen consumption. Cardiac work is best represented by the area of the curve of a pressure-volume loop.

Driving Pressure in ARDS: A new concept!

Driving Pressure and Survival in the Acute Respiratory Distress Syndrome Marcelo B.P. Amato, M.D., Maureen O. Meade, M.D., Arthur S. Slutsky, M.D., Laurent Brochard, M.D., Eduardo L.V. Costa, M.D., David A. Schoenfeld, Ph.D., Thomas E. Stewart, M.D., Matthias Briel, M.D., Daniel Talmor, M.D., M.P.H., Alain Mercat, M.D., Jean-Christophe M. Richard, M.D., Carlos R.R. Carvalho, M.D., and Roy G. Brower, M.D. N Engl J Med 2015; 372:747-755 February 19, 2015 DOI: 10.1056/NEJMsa1410639 BACKGROUND Mechanical-ventilation strategies that use lower end-inspiratory (plateau) airway pressures, lower tidal volumes (V T ), and higher positive end-expiratory pressures (PEEPs) can improve survival in patients with the acute respiratory distress syndrome (ARDS), but the relative importance of each of these components is uncertain. Because respiratory-system compliance (C RS ) is strongly related to the volume of aerated remaining functional lung during disease (termed functional lung size)...

Anaphylaxis updates part 2- Empty Ventricle Syndrome

Patients with anaphylaxis should not suddenly sit, stand, or be placed in the upright position. Instead, they should be placed on the back with their lower extremities elevated or, if they are experiencing respiratory distress or vomiting, they should be placed in a position of comfort with their lower extremities elevated. This accomplishes 2 therapeutic goals: 1) preservation of fluid in the circulation (the central vascular compartment), an important step in managing distributive shock; and 2) prevention of the empty vena cava/empty ventricle syndrome, which can occur within seconds when patients with anaphylaxis suddenly assume or are placed in an upright position. Patients with this syndrome are at high risk for sudden death. They are unlikely to respond to epinephrine regardless of route of administration, because it does not reach the heart and therefore cannot be circulated throughout the body

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