Complications in Anesthesia Practice Questions

Q: Which is the MOST accurate statement regarding post-dural anesthetic headache:

Occurs due to low CSF pressure. ***Occurs due to low CSF pressure*** - Post-dural puncture headache (PDPH) results from continued leakage of **cerebrospinal fluid (CSF)** through the dural tear, leading to reduced intracranial pressure. - This **low CSF pressure** causes distension of pain-sensitive intracranial structures, particularly when the patient is upright. *Headache worsens with upright posture* - While the headache typically **worsens with upright posture** and improves when supine, this is a symptom rather than the underlying mechanism or the most accurate statement describing the cause. - The positional nature of the headache is a direct consequence of the **low CSF pressure**. *Blood patch is the first line of treatment* - An **epidural blood patch** is a highly effective treatment for PDPH, but it is typically reserved for severe or persistent cases that do not respond to conservative measures. - **Conservative treatment** (e.g., bed rest, hydration, analgesics, caffeine) is usually the first line, especially for mild symptoms. *Increased incidence with early mobilization of patient* - **Early mobilization** does not directly increase the incidence of PDPH. The primary risk factor is the size and type of the dural puncture. - However, early mobilization can exacerbate the symptoms of an existing PDPH due to the gravitational effect on **CSF pressure**.

Q: During surgery, a transfusion reaction is manifested as:

Hypotension. ***Hypotension*** - **Hypotension** is the most critical and readily detectable sign of an acute hemolytic transfusion reaction during surgery, often resulting from the release of vasodilatory substances and systemic inflammation. - While under anesthesia, many typical signs of transfusion reaction (e.g., fever, chills, back pain) are masked, making changes in vital signs like a sudden drop in **blood pressure** particularly crucial indicators. - In the anesthetized patient, unexplained hypotension during transfusion should immediately raise suspicion of a transfusion reaction. *Hypothermia* - **Hypothermia** is typically associated with massive transfusions of cold blood products, not directly with an acute immunological transfusion reaction. - Although it can occur during surgery due to various factors, it is not a primary manifestation of a direct transfusion reaction. *Bleeding* - **Bleeding** can be a complication of a severe transfusion reaction, specifically due to **disseminated intravascular coagulation (DIC)**, but it's usually a later or more severe manifestation, not the initial presenting sign. - The primary initial clinical sign of an acute hemolytic reaction is often related to cardiovascular instability rather than overt hemorrhage. *Increased muscle movement* - **Increased muscle movement** is unlikely to be a direct manifestation of a transfusion reaction in an anesthetized patient. - While some reactions can cause muscle spasms or rigidity, these are typically masked by paralytic agents or deep anesthesia during surgery. *Tachycardia* - While **tachycardia** can occur as a compensatory response to hypotension, it is less specific and less reliable as an indicator of transfusion reaction in anesthetized patients. - The anesthesiologist primarily monitors for **hypotension** as the key diagnostic sign rather than tachycardia alone.

Q: A 42-year-old male was undergoing elective hernioplasty. End tidal carbon dioxide (ETC02) was found to be increased. Abdominal wall gradually showed rigidity, along with the presence of tachycardia and tachypnea. Blood gas analysis shows an increased mixed acidosis, along with a serum lactate of 3.4 mmol/L. Which of the following has most likely resulted in the present situation?

Malignant hyperthermia. ***Malignant hyperthermia*** - The triad of **increased ETCO2**, **muscle rigidity**, and **tachycardia/tachypnea** during anesthesia strongly indicates malignant hyperthermia. - The **increased mixed acidosis** and **hyperlactatemia** are consequences of the uncontrolled hypermetabolic state in skeletal muscle. *Pheochromocytoma* - While it can cause **tachycardia** and **hypertension**, it does not typically present with the immediate increase in **ETCO2** and profound **muscle rigidity** seen in this scenario. - It is characterized by excessive catecholamine release, which would largely cause **hypertension** and not metabolic acidosis with a rise in ETC02 without any form of ventilation problem. *Complication of serotonergic drugs (SS)* - **Serotonin syndrome** is associated with altered mental status, autonomic instability (tachycardia, labile blood pressure), and neuromuscular abnormalities such as **hyperreflexia** and **clonus**, but typically not during surgical anesthesia with volatile agents. - **Muscle rigidity** can occur, but the dramatic increase in **ETCO2** and rapid onset during surgery point away from serotonin syndrome. *Complication of antipsychotic medication (NMS)* - **Neuroleptic Malignant Syndrome (NMS)** involves severe muscle rigidity, fever, and autonomic dysfunction, similar to malignant hyperthermia. - However, NMS usually develops over days to weeks after exposure to neuroleptics, not acutely during anesthesia, and **ETC02** is not a primary diagnostic criterion.

Q: Muscle pain after anaesthesia is caused by –

Suxamethonium. ***Suxamethonium*** - **Suxamethonium** (succinylcholine) is a depolarizing neuromuscular blocker that can cause **postoperative myalgia** due to generalized muscle fasciculations before paralysis. - This muscle pain is a common side effect, especially in young, muscular patients, and is thought to be due to uncoordinated muscle contractions and microscopic muscle damage. *D-tubocurare* - **D-tubocurare** is a non-depolarizing neuromuscular blocker that **does not cause muscle fasciculations** and therefore is not typically associated with postoperative muscle pain. - Its mechanism involves competitive blockade of acetylcholine receptors at the neuromuscular junction without causing depolarization. *All of the options* - This option is incorrect because **only suxamethonium** among the listed drugs is commonly associated with muscle pain after anesthesia. - Non-depolarizing agents like d-tubocurare and vecuronium do not cause the fasciculations that lead to myalgia. *Vecuronium* - **Vecuronium** is an intermediate-acting, non-depolarizing neuromuscular blocker that achieves muscle relaxation without causing initial fasciculations. - As a result, it is not associated with the **postoperative muscle pain** seen with suxamethonium.

Q: Which does not cause malignant hyperthermia –

N2O. ***N2O*** - **Nitrous oxide** is a weak inhaled anesthetic and does not trigger **malignant hyperthermia** (MH). - Its mechanism of action does not involve the **ryanodine receptor** or calcium release, which are central to MH pathophysiology. *Enflurane* - **Enflurane** is a volatile inhaled anesthetic that is a known trigger for **malignant hyperthermia**. - It induces uncontrolled **intracellular calcium release** in skeletal muscle, leading to hypermetabolism. *Desflurane* - **Desflurane** is another potent volatile inhaled anesthetic and a classic trigger agent for **malignant hyperthermia**. - Its use can result in a rapid onset of MH symptoms due to its quick pharmacokinetics. *Isoflurane* - **Isoflurane** is also a volatile inhaled anesthetic and is well-established as a trigger for **malignant hyperthermia**. - Like other volatile agents, it can bind to the **ryanodine receptor** (RyR1), causing excessive calcium efflux.

Q: Mendelsons syndrome is:

Aspiration of gastric contents. ***Aspiration of gastric contents*** - Mendelson's syndrome refers to a chemical pneumonitis resulting from the **aspiration of acidic gastric contents** into the respiratory tract. - This typically occurs during **anesthesia**, sedation, or altered consciousness when airway reflexes are blunted. *Allergic reaction to inhalational anesthetics* - Allergic reactions to anesthetics are distinct from Mendelson's syndrome and involve an **immunological response**, not direct chemical burn. - Symptoms would include rash, bronchospasm, and hypotension, rather than pneumonitis from aspiration. *Aspiration of nasal secretions* - While aspiration of nasal secretions can occur, it's generally less irritating and does not typically lead to the severe inflammatory lung injury characteristic of Mendelson's syndrome, which is specifically due to **acidic gastric contents**. - Nasal secretions are usually **less acidic** and contain different microbial flora. *Complications from improper intubation* - Improper intubation can lead to complications such as **esophageal intubation**, trauma to the airway, or vocal cord damage. - These are **mechanical injuries** or misplacements and are distinct from aspiration pneumonitis caused by gastric contents.

Q: A postspinal headache is due to -

CSF leak from dura. ***CSF leak from dura*** - A post-dural puncture headache (PDPH) occurs due to the **leakage of cerebrospinal fluid (CSF)** through the puncture site in the dura mater, leading to **intracranial hypotension**. - This reduction in CSF pressure causes the brain to sag, resulting in tension on pain-sensitive structures like blood vessels and meninges, especially when the patient is in an **upright position**. *Injury to spinal cord* - Injury to the spinal cord would typically manifest as **neurological deficits** such as weakness, sensory loss, or paralysis below the level of injury, not primarily a headache. - The spinal cord itself is insensitive to pain, and direct injury is an **uncommon complication** of spinal procedures, distinct from the mechanism of headache. *Raised intracranial pressure* - Raised intracranial pressure typically causes headaches that are **worse when lying down** or with activities that increase pressure (e.g., coughing), often accompanied by focal neurological signs or papilledema. - A postspinal headache is a classic example of a headache caused by **low intracranial pressure**, making this option incorrect. *Meningitis* - Meningitis is an inflammation of the meninges, causing severe headache, **neck stiffness (nuchal rigidity)**, fever, and photophobia. - While a lumbar puncture can sometimes introduce infection (a rare complication), a typical postspinal headache is **aseptic** and primarily due to CSF leakage, not meningeal inflammation.

Q: HR-180, BP-60/40, temp-39.5°C, ETCO2-65 post induction. Most likely diagnosis:

Malignant hyperthermia. ***Malignant hyperthermia*** - The rapid onset of **tachycardia (HR-180)**, **hyperthermia (temp-39.5°C)**, and profoundly elevated **ETCO2 (65 mmHg)** immediately following anesthetic induction is the classic presentation of malignant hyperthermia. - This condition is a pharmacogenetic disorder, triggered by volatile anesthetics (e.g., isoflurane) and succinylcholine, leading to uncontrolled skeletal muscle metabolism and hypercapnia. *Thyroid storm* - While thyroid storm can cause **tachycardia** and **hyperthermia**, the sudden and dramatic rise in **ETCO2** is not a characteristic feature. - Onset is typically less abrupt and often associated with pre-existing hyperthyroidism or a precipitating event like surgery or infection, rather than immediate post-induction. *Anaphylaxis* - Anaphylaxis typically presents with **hypotension (BP-60/40)**, **tachycardia**, and often features like **bronchospasm**, **rash**, or **angioedema**. - Although it can cause **bronchospasm** leading to increased ETCO2, the extreme elevation to 65 mmHg is less typical, and **profound hyperthermia** is not a primary symptom. *Septic shock* - **Septic shock** is characterized by **hypotension** and **tachycardia**, often accompanied by **fever**, but its onset is usually prolonged over hours to days. - A sudden increase in **ETCO2** to 65 mmHg immediately post-induction is uncharacteristic for sepsis, which relates to an exaggerated, systemic inflammatory response to infection.

Q: Among the following anesthetic agents, which is most commonly associated with anaphylaxis?

Propofol. ***Propofol*** - **Propofol** is an anesthetic agent commonly associated with **anaphylaxis**, although the exact mechanism is not fully understood. - Anaphylactic reactions to propofol can range from mild cutaneous symptoms to severe cardiovascular collapse. *N2O* - **Nitrous oxide (N2O)** is a gaseous anesthetic that is generally considered to have a very **low incidence of allergic reactions** or anaphylaxis. - Its primary role is as an analgesic and sedative, rather than a potent sole anesthetic. *Althesin* - **Althesin** (alfaxalone and alphadolone) is a neurosteroid anesthetic that was formerly associated with a **high incidence of anaphylactic reactions**, leading to its withdrawal from many markets. - The high rate of anaphylaxis was largely attributed to its solvent, **Cremophor EL**. *Halothane* - **Halothane** is a volatile anesthetic that was historically linked to **halothane hepatitis**, a severe idiosyncratic liver injury, rather than anaphylaxis. - While allergic reactions are possible with any drug, halothane is not primarily known for causing anaphylactic events.

Q: What is the most common cause of death in anesthesia-related malpractice claims?

Airway obstruction. ***Airway obstruction*** - **Airway obstruction** is frequently cited as the leading cause of death in anesthesia-related malpractice claims due to its rapid progression and critical impact on oxygenation. - Failure to adequately manage the airway, including challenges during intubation or extubation, or unrecognized dislodgement of the endotracheal tube, can quickly lead to **hypoxia** and subsequent cardiac arrest. *Cardiovascular events* - While serious, **cardiovascular events** like myocardial infarction or arrhythmias are often linked to pre-existing patient conditions or drug interactions, but are less commonly the primary root cause of death directly attributable to provider malpractice than airway issues. - The immediate onset and severity of **unmanaged airway compromise** typically lead to more rapid and irreversible outcomes compared to many cardiovascular incidents which may allow for more time for intervention. *Medication errors* - **Medication errors**, such as incorrect dosing or administration of anesthetics, can lead to adverse events, but fatal outcomes are often a result of systemic effects like respiratory depression or severe cardiovascular compromise which, while serious, occur less frequently than direct airway mismanagement. - Although significant, many **medication errors** are detectable and reversible if promptly identified, whereas severe airway obstruction can be immediately life-threatening. *Aspiration* - **Aspiration** of gastric contents into the lungs can lead to chemical pneumonitis and acute respiratory distress syndrome, which can be fatal. - However, aspiration is generally less frequent than problems directly related to maintaining a patent airway during the entire perioperative period.

Question 1

Which is the MOST accurate statement regarding post-dural anesthetic headache:

Accepted Answer

Occurs due to low CSF pressure

Answer

Headache worsens with upright posture

Answer

Blood patch is the first line of treatment

Answer

Increased incidence with early mobilization of patient

Question 2

During surgery, a transfusion reaction is manifested as:

Accepted Answer

Hypotension

Answer

Hypothermia

Answer

Bleeding

Answer

Increased muscle movement

Answer

Tachycardia

Question 3

A 42-year-old male was undergoing elective hernioplasty. End tidal carbon dioxide (ETC02) was found to be increased. Abdominal wall gradually showed rigidity, along with the presence of tachycardia and tachypnea. Blood gas analysis shows an increased mixed acidosis, along with a serum lactate of 3.4 mmol/L. Which of the following has most likely resulted in the present situation?

Accepted Answer

Malignant hyperthermia

Answer

Pheochromocytoma

Answer

Complication of serotonergic drugs (SS)

Answer

Complication of antipsychotic medication (NMS)

Question 4

Muscle pain after anaesthesia is caused by –

Accepted Answer

Suxamethonium

Answer

D-tubocurare

Answer

All of the options

Answer

Vecuronium

Question 5

Which does not cause malignant hyperthermia –

Accepted Answer

N2O

Answer

Enflurane

Answer

Desflurane

Answer

Isoflurane

Question 6

Mendelsons syndrome is:

Accepted Answer

Aspiration of gastric contents

Answer

Allergic reaction to inhalational anesthetics

Answer

Aspiration of nasal secretions

Answer

Complications from improper intubation

Question 7

A postspinal headache is due to -

Accepted Answer

CSF leak from dura

Answer

Injury to spinal cord

Answer

Raised intracranial pressure

Answer

Meningitis

Question 8

HR-180, BP-60/40, temp-39.5°C, ETCO2-65 post induction. Most likely diagnosis:

Accepted Answer

Malignant hyperthermia

Answer

Thyroid storm

Answer

Anaphylaxis

Answer

Septic shock

Question 9

Among the following anesthetic agents, which is most commonly associated with anaphylaxis?

Accepted Answer

Propofol

Answer

Althesin

Answer

N2O

Answer

Halothane

Question 10

What is the most common cause of death in anesthesia-related malpractice claims?

Accepted Answer

Airway obstruction

Answer

Medication errors

Answer

Cardiovascular events

Answer

Aspiration

Complications in Anesthesia — MCQs

Complications in Anesthesia — MCQs

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