Say you had a 80 yom patient with pale cool clammy skin, a bp of 88/58, hr of 80 (no beta blockers), rr of 16 and a spo2 of 97 who experienced a syncopal episode secondary to possible dehydration. Would you treat this patient as a shock patient with high flow o2 and rapid transport? Does hypotension always equal shock?
Pale, cool skin and a MAP of 68 is concerning in an 80 year old, whose MAP is probably usually much higher. If they have a vagal episode, pass out, and then recover (skin color/temp and BP improves), then no problem - older folks are, unfortunately, susceptible to that sort of thing due to changes in our autonomic nervous systems as we age. You actually can make an argument that someone who is hypotensive AND has pale, cool skin is by definition in the early stages of shock, but since that can also be a very transient condition, the label "shock" is usually reserved for a condition that will not reverse itself.
But a BP that persists in that range and is accompanied by skin signs potentially means something very bad is going on, whether simple dehydration, a GI bleed, etc. Pale, cool skin means that the body is reflexively reducing blood flow to the skin and periphery in order to conserve oxygen and deliver it where it is needed more (heart, brain, kidneys).
What made you suspect dehydration? What were your differentials? My very first question would be what is his normal BP. History is very important here. Unless you are very confident in your diagnosis and ability to rule out something more serious, AND there is someone to stay with the patient to call back if necessary, transport is definitely indicated.
To summarize some of the points that were already made:
- Shock is a state of inadequate end-organ perfusion. It is not defined by blood pressure. There are different types (causes) and stages of shock that you should read about.
- Hypotension simply means "lower than normal blood pressure", and is often defined as SBP <90 or 100, or MAP <65, but these are somewhat arbitrary and therefore vary from reference to reference. Someone with a BP of 88/58
- Hypotension will cause inadequate end-organ perfusion (shock), if it is severe or prolonged. But simply having a lower BP than normal does not mean one is in shock.