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Hypotension (low blood pressure) is just as serious of a problem as a very high blood pressure (hypertension). But what causes low blood pressure and what should you do if you encounter it?

In general, low blood pressure can be thought of as a rate, pump or volume problem.

Bradycardia or tachycardia can cause a decrease in blood pressure. Problems with the pump - that is the heart function - may be things such as a myocardial infarction or cardiogenic shock causing low blood pressure. Other conditions such as hypothermia or cardiac depressant medications can cause low blood pressure by affecting the pump.

Perhaps the most common etiology of low blood pressure encountered clinically would be volume problems from things such as hypovolaemic shock, severe dehydration, haemorrhage or septic shock, anaphylaxis and neurogenic shock from spinal cord injury, are reasonably common causes of low blood pressure.

Low blood pressure should be evaluated and treated urgently. An assessment of low blood pressure should include a recheck of the pressure and close monitoring. If a client has recently changed positions, they should be returned to a supine position and rechecked in a few minutes.

Orthostasis literally means, ‘standing upright’. Orthostatic hypotension is defined as a decrease in systolic blood pressure of at least 20 mmHg, or at least 10 mmHg diastolic, within 3 minutes of the patient standing. If orthostatic hypotension is encountered, then the client is at risk of falls and should be closely supervised with ambulation or advised to call for assistance with the activity.

To test for orthostatic hypotension, take the blood pressure whilst the patient is supine and at rest, then stand the patient. They must be able to stand for 3 minutes before taking the blood pressure again.

If the measurements meet the criteria stated previously, then orthostatic hypotension is evident.

If the result is equivocal, record that and request a formal assessment.


37 Total Rating(s)
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Laura Hunter
20 Mar 2020

Good, succinct information presented in a clear and easy to follow way.

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Teresa Cooper
17 Mar 2020

Very interesting and relevant

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Lynda Rollason
16 Mar 2020

this is a great resource for a new Nurse

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Sarah Thomas
13 Mar 2020

This was a good, quick review of hypotension and its main causes and appropriate nursing responses.

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Lynnette Laker
12 Mar 2020

Easy to listen to & absorb.

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Robin Harris
08 Mar 2020

Quick, simple and to the point.

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Brett Nicholson
07 Mar 2020

Easy to follow and well presented

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Lachlan Blake
05 Mar 2020

i really liked how concise this course was and how it still retained all the relevant information.

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Helen Watson
05 Mar 2020

Low BP and high BP are both important and can put a resident at high falls risk. Communication with all staff about concerns.

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Mary W ndichu
04 Mar 2020

A good refreshing course