Unit 4: Medical Technologies
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Transcript of Unit 4: Medical Technologies
Unit 4: Medical Technologies
- any format of machinery that is used to operate or perform medical procedures
To know if something is “wrong” you need to know what is “right” Primary Vital Signs and Normal
Ranges
http://www.med.ucla.edu/wilkes/intro.html
Primary Vital Signs- Allow for a basic assessment of body
function
1. Temperature
2. Blood Pressure
3. Pulse (heart rate)
4. Respiratory Rate
Each of these has a normal range, a range that’s common in 95% of the population
The normal range will vary with sex, age, fitness, ethnicity, etc.
1. Temperature Proteins are affected by body
temperatures, therefore we usually thermoregulate to maintain a constant core temperature (36.8 +/- 0.7)
How do we thermoregulate?
When we are hot: we sweat, the hairs on our bodies lie flat and our blood vessels become wider (vasodilation)
When we are cold: we shiver, we get goose bumps to trap heat and we vasoconstrict
High core body temperature can indicate
Infection (a temporary re-setting of the thermostat, part of non-specific immunity)
Hyperthermia (loss of thermoregulation due to heat stroke or drug reaction)
low core body temperature (hypothermia) is normally due to exposure to low temperatures
2. Blood Pressure Pressure exerted by circulating blood
on the walls of the blood vessels
Composed of two readings Systolic: maximal contraction (ventricular)
of heart (115 mm Hg) Diastolic: resting pressure (70 mm Hg)
115/70 is “normal” http://www.pennmedicine.org/encyclopedi
a/em_DisplayAnimation.aspx?gcid=000013&ptid=17
Measured using a sphygmomanometer
http://www.sumanasinc.com/webcontent/animations/content/bloodpressure.html
hypertension
Blood pressure is abnormally high A risk factor for strokes, heart
attacks, heart failure Shortens life expectancyCauses: Very complex, but risk factors
include sedentary life style, obesity, salt sensitivity
Classification
Systolic pressure
Diastolic pressure
mmHg
kPa (kN/m2)
mmHgkPa (kN/m2)
Normal90–119
12–15.9 60–79 8.0–10.5
Prehypertension
120–139
16.0–18.5
80–8910.7–11.9
Stage 1140–159
18.7–21.2
90–9912.0–13.2
Stage 2 ≥160 ≥21.3 ≥100 ≥13.3
Isolated systolichypertension
≥140 ≥18.7 <90 <12.0
Source: American Heart Association (2003).[8]
hypotension
Blood pressure abnormally low Usually shows as dizziness,
sometimes fainting Can be due to hormonal changes,
widening of blood vessels, side effects of medicines, etc.
3. Pulse (heart rate) Physical expansion of the artery Varies with age, in an adult 50-80
beats per minute Bradycardia: below 60 bpm Tachycardia: above 100 bpm
DIY: pair up and exercise your heart!
4. Respiration Rate
Normal adult 12-2o breaths per minute
Age
Normal heart rate
(beats per minute)[15]
Normal respiratory rate
(breaths per minute)[16]
Newborn 100-160 [17] 30-50
0–5 months 90-150 25-40
6–12 months 80-140 20-30
1–3 years 80-130 20-30
3–5 years 80-120 20-30
6–10 years 70-110 15-30
11–14 years 60-105 12-20
14+ years 60-100 12-20