L6, Corrosives - Toxocology

Lecture view 


 1-As regard corrosives

a) Vomiting can be induced for GIT decontamination of potash

 b) Neutralization with acid is the best method of Clorox GIT decontamination

 c) Gastric lavage is absolutely contraindicated with potash

d) Phenol ingestion chelate Ca and causes hypocalcemia


2-About corrosive ingestion all are true except

a) Constipation is a common symptom whereas alkali cause diarrhea.

 b) Gastric lavage and syrup of ipecac are contraindicated.

c) Neutralization of alkali with acid is contraindicated. 

d) Endoscopy is preferred after 2-3 days

3-All the following statements are true about corrosive poisoning


a) It is usually accidental in children.

b) On ingestion there is vomiting, diarrhea and severe burning pain

c) On inhalation, onset of respiratory symptoms is early 

d) In alkali skin burns, decontamination can take hours

4-Ocular injuries after corrosive exposure (all are true except)

a) Cause blindness especially keratitis. 

b) Alkali injuries more severe than acid related eye injuries

c) Acid injuries more severe than alkali which are superficial 

d) Should be treated immediately with copious irrigation and

ophthalmology consultation

5-Gastric lavage can be done in all of the following except:

a) Carbolic acid

 b) Caustic potash

c) Oxalic acid

d) Glacial Acetic acid

6-Coagulative necrosis of the stomach is caused by:

a) Potassium carbonate

 b) Calcium hydroxide

c) Nitric acid

d) Ammonia

7-Liquefactive necrosis of the esophagus is caused by:

a) Hydrofluoric acid

 b) Sodium bisulfate.

c) Sodium hydroxide 

d) Oxalic acid

8-The initial management of an adult patient who has ingested a large volume of a strong acid should include all of the following except:

a) Give about 150 ml of milk if the patient can drink

 b) Inspect and secure the airway

 c) Instill sodium bicarbonate to neutralize any remaining acid

d) Give analgesics (morphine) to relieve pain

 9-All of the following are recommended following a large ingestion of a strong alkali except:

a) Administer milk immediately if the patient can swallow

 b) Attempt to pass a small lavage tube to aspirate gastric contents 

c) Inspect and secure the airway

d) Administer corticosteroids and a broad spectrum antibiotic

 10-Corroded tissue of nitric acid is characterized by

a) White in color. 

b) Grey in color.

c) Yellow in color.

d) Black in color due to charring. 

11-Phenol poisoning is characterized by all the following

a) Vomiting

 b) Constricted pupils.

c) Urine color turns on green on exposure to air.

d) Aromatic smell in breath.

 12-As regard carbolic acid all are true except

a) It causes brown eschars around the mouth

b) It causes at first intense pain followed by local anesthesia

 c) Gastric lavage can be done

d) It denatures the protein and causes liquefactive necrosis of tissues

e) Renal failure is one of its manifestations

1- In carbolic acid toxicity, gastric lavage is contraindicated.        f

 2- The tissues exposed to caustic alkali show liquefactive necrosis while those     

exposed to caustic acids show coagulative necrosis.         t

3- Ingestion of carbolic acid induces severe permanent burning pain.        f

4- Acids corrosives are more dangerous than alkali corrosives.            f

 5- Concentration of a caustic is more important than PH in inducing damage.      t

6- Upper GIT endoscopy is the most important indicator of corrosive injuries   t

7- Urine analysis is important in cases of Phenol ingestion.       t

8- Alkali injuries to the eye are generally more severe than the acid related eye injuries       t

9- Gastric lavage is indicated and essential in treatment of carbolic       t

Acid poisoning.

10- Steroid use has never been recommended in acid ingestion              f

 11- Urine of patient with carbolic acid turn green on exposure to air due to

oxidation of its metabolites.       t

12- Hemodialysis may be indicated in carbolic acid poisoning.     t

13- In corrosive poisoning we give excessive amount of milk or water for dilution.         f

14- Avoid emesis and gastric lavage in corrosive poisoning but give activated charcoal.        f