Don’t drink and drive: How to calculate how much alcohol you have consumed
The general rule of thumb is a maximum of one unit of alcohol per hour. However, to be safer, if you are going to be driving, rather refrain from drinking any alcohol.
YOU insisted on driving because you only had a few drinks.
Days later you wake up in hospital. Suddenly you remember a crash scene. You were trapped in your vehicle and your family was scattered around the area. You later find out that your child died in the collision.
This is one of several ways your future could change for the worse, reports our sister publication, Kempton Express
It could also end with you killing innocent people, facing jail time or even losing your own life. So just few drinks… is it worth it?
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Dr Robyn Holgate, the Chief Medical Officer of ER24, said, “In South Africa, the legal limit is a breath alcohol content of 0.24mg per 1,000ml, or a blood alcohol limit of 0.05g per 100ml. The general rule of thumb is a maximum of one unit of alcohol per hour. However, to be safer, if you are going to be driving, rather refrain from drinking any alcohol. Alcohol distorts a person’s judgement and perceptions as well as slows down reaction times.”
She added that mild to moderate intoxication can impact on a person in a number of ways. It could lead to mild incoordination, nystagmus (fast involuntary movements of the eyes), ataxia (loss of full control of body movements) and slurred speech. A higher level of intoxication may lead to coma, respiratory depression and a drop in blood pressure.
Loud aggressive behaviour with the loss of inhibition may also occur as a result of alcohol consumption.
“If you are ever in doubt about the serious consequences of driving while under the influence, volunteer for a shift at your local EMS or police service,” said Dr Holgate.
Apart from witnessing how lives are torn apart, you will witness the difficulty paramedics experience when attending to an intoxicated patient. You will also experience the problems encountered by paramedics who try to attend to a patient in the company of an intoxicated uninjured person on scene.
Saul Behrmann, ER24 Joburg North Branch Manager, said gaining correct information from an intoxicated patient, such as how the incident happened, what they remember and contact details for family members who need to be informed of the patient’s injuries, is challenging.
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It is also difficult to gain information from an intoxicated patient on their medical conditions as well as medication they are on.
Dr Holgate said people who consume alcohol should note that the rate at which a person becomes intoxicated varies. “On average, it takes about one hour for the body to metabolise one unit of alcohol. However, this can vary based on body weight, sex, age, personal metabolic rate, recent food intake, the type and strength of the alcohol and medication taken,” said Dr Holgate.
She provided the following explanation:
1. If a man and woman of the same weight were to drink the same amount of alcohol at the same rate, the woman would be more intoxicated than the man. This is due to gastric alcohol dehydrogenase concentration being significantly higher in men than in women.
Gastric alcohol dehydrogenase is the enzyme that begins the break-down process of alcohol in the stomach. More alcohol makes its way to a woman’s small intestine for absorption. A woman’s blood alcohol concentration increases by about seven percent more that a man. Women have a naturally higher percentage of body fat than men. This results in them having a higher blood alcohol level than men.
2. An older person often has a higher fat-to-muscle ratio and less body water. As a result, when compared to a younger person with the same weight who has had the same amount to drink, they may have a higher amount of alcohol in their blood.
3. The use of illicit drugs and medication such as antihistamines, pain relievers and antidepressants in conjunction with alcohol can increase the effect of the alcohol consumed. Drinking alcohol while on illicit, over-the-counter and prescription drugs can lead to illness or death.
4. Drinking alcohol on an empty stomach can affect a person more than if they were to eat before drinking liquor. The rate of alcohol absorption depends on how fast the stomach empties its contents into the intestines. Foods high in fat for example take longer to exit the stomach. If you eat before you consume alcohol, the alcohol will be absorbed slower than if you were to drink on an empty stomach.
5. Alcohol may be metabolised more slowly if your liver function is impaired.
How do you calculate how many units of alcohol you have consumed?
Multiply the volume of the drink (in millilitres) by its percentage alcohol by volume and divide by 1000 to determine the number of units of alcohol in the drink you had.
For example:
· 350 millilitres of beer at five percent volume would be calculated 350 x 5/1000 = 1.75 units.
· 750 millilitres of wine at 12 percent volume would be calculated 750 x 12/1000 = 9.0 units.
Think before you drink.
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