Complications in Anesthesia Practice Questions

Q: What is the commonest sign of aspiration pneumonitis?

Tachypnea. **Explanation:** **Mendelson’s Syndrome (Aspiration Pneumonitis)** occurs due to the inhalation of acidic gastric contents (pH 25ml). This leads to a chemical burn of the pulmonary parenchyma, resulting in immediate physiological responses. **Why Tachypnea is the Correct Answer:** **Tachypnea** is the **earliest and most common clinical sign** of aspiration pneumonitis. The presence of acidic fluid in the alveoli triggers an inflammatory response and disrupts surfactant, leading to micro-atelectasis. This decreases lung compliance and stimulates J-receptors, causing a rapid, shallow breathing pattern. While other signs develop as the condition progresses, an increase in respiratory rate is the most sensitive initial indicator. **Analysis of Incorrect Options:** * **Cyanosis:** This is a late sign indicating severe hypoxemia and significant ventilation-perfusion (V/Q) mismatch. It is not the most common or earliest sign. * **Crepitations (Rales):** These occur due to the presence of fluid and exudate in the alveoli. While common, they may take time to develop fully and are often preceded by tachypnea. * **Rhonchi:** These represent airway narrowing or secretions in larger bronchi. While they can occur due to bronchospasm (a common feature), they are less consistent than tachypnea. **High-Yield Clinical Pearls for NEET-PG:** * **Mendelson’s Criteria:** Gastric pH ** 0.4 ml/kg (approx. 25 ml)**. * **Commonest Site:** The **Right Lower Lobe** (specifically the superior segment) is the most frequent site of aspiration due to the more vertical anatomy of the right main bronchus. * **Management:** Immediate treatment involves oropharyngeal suctioning. **Prophylactic antibiotics and steroids are NOT recommended** for chemical pneumonitis unless secondary bacterial infection occurs.

Q: A 35-year-old male developed a headache relieved by lying down two days after a surgical procedure. What is the definitive treatment for this condition?

Autologous blood patch. ### Explanation The clinical presentation of a headache that is postural in nature (relieved by lying down and worsened by sitting or standing) following a surgical procedure (likely involving spinal or epidural anesthesia) is classic for **Post-Dural Puncture Headache (PDPH)**. **1. Why "Autologous Blood Patch" is correct:** While conservative management is often tried first, the **Epidural Blood Patch (EBP)** is considered the **definitive (gold standard) treatment** for PDPH. It involves injecting 15–20 ml of the patient's own venous blood into the epidural space at or near the level of the previous dural puncture. The blood clots to "plug" the dural hole, preventing further leakage of Cerebrospinal Fluid (CSF) and restoring intracranial pressure. **2. Why other options are incorrect:** * **NSAIDs and Caffeine (Options A & D):** These are components of **conservative management**. Caffeine causes cerebral vasoconstriction, which provides symptomatic relief by counteracting the compensatory vasodilation caused by low CSF pressure. However, they do not fix the underlying dural hole and are not "definitive." * **Physiotherapy (Option B):** There is no clinical role for physiotherapy in the management of PDPH. **3. High-Yield Clinical Pearls for NEET-PG:** * **Pathophysiology:** CSF leak through a dural rent $\rightarrow$ low CSF pressure $\rightarrow$ traction on pain-sensitive intracranial structures (vessels and nerves). * **Risk Factors:** Use of large-bore cutting needles (e.g., Tuohy), female gender, pregnancy, and young age. * **Needle Types:** **Quincke** (cutting) has the highest risk; **Sprotte and Whitacre** (pencil-point/non-cutting) have the lowest risk. * **Timing:** Usually appears within 48–72 hours post-procedure. * **Associated Symptom:** Occasional involvement of the 6th Cranial Nerve (Abducens), leading to diplopia.

Q: Which of the following is NOT a risk factor for developing bronchospasm during anesthesia?

Old age. **Explanation:** Bronchospasm is a sudden constriction of the muscles in the walls of the bronchioles, often triggered by airway hyperreactivity. **Why "Old Age" is the correct answer:** While elderly patients often have comorbidities (like COPD), **age itself is not an independent risk factor** for bronchospasm. In fact, airway hyperreactivity is generally more common and severe in children and young adults (due to smaller airway caliber and higher incidence of reactive airway diseases like asthma). Therefore, being elderly does not inherently predispose a patient to acute bronchospasm during induction or maintenance of anesthesia. **Why the other options are incorrect:** * **Perioperative Respiratory Infection (A):** This is a major risk factor. Recent viral infections (within 2–4 weeks) increase airway sensitivity and mucus production, significantly raising the risk of bronchospasm. * **Endotracheal Intubation (B):** Mechanical stimulation of the larynx and trachea by an ETT is the most common trigger for bronchospasm in the perioperative period, especially during "light" planes of anesthesia. * **Presence of COPD (C):** Patients with COPD or Asthma have baseline airway inflammation and hyperresponsiveness, making them highly susceptible to bronchoconstriction when exposed to irritants like volatile anesthetics or secretions. **Clinical Pearls for NEET-PG:** * **Management:** The first step in managing intraoperative bronchospasm is to **deepen the plane of anesthesia** (using Volatile agents like Sevoflurane, which is a potent bronchodilator) and administer 100% Oxygen. * **Drug of Choice:** In acute, severe cases, inhaled or IV **Beta-2 agonists (Salbutamol)** are the mainstay. * **Avoid:** Thiopental and Morphine should be used with caution in high-risk patients as they can trigger histamine release, potentially worsening bronchospasm. Ketamine is the induction agent of choice due to its bronchodilatory properties.

Q: Which disease is known to be associated with malignant hyperthermia?

Denborough syndrome. **Explanation:** **Malignant Hyperthermia (MH)** is a pharmacogenetic hypermetabolic crisis of skeletal muscle triggered by volatile anesthetics (e.g., Halothane, Sevoflurane) and depolarizing muscle relaxants (Succinylcholine). It is primarily caused by a mutation in the **RYR1 gene** (ryanodine receptor), leading to massive calcium release from the sarcoplasmic reticulum. **Why Denborough Syndrome is correct:** **King-Denborough Syndrome (KDS)** is a rare congenital myopathy characterized by a specific triad: dysmorphic features (short stature, ptosis, cryptorchidism), skeletal abnormalities, and a **high susceptibility to Malignant Hyperthermia**. It is the classic syndrome associated with MH in medical literature and exams. Other strongly associated conditions include Central Core Disease and Multiminicore Disease. **Analysis of Incorrect Options:** * **Huntington Chorea:** A neurodegenerative disorder involving the basal ganglia. While it involves motor symptoms, it has no known association with the RYR1 mutation or MH. * **Fabry Disease:** A lysosomal storage disorder (alpha-galactosidase A deficiency) affecting the kidneys and heart; it does not involve skeletal muscle calcium signaling. * **Burns:** While burn patients can develop **hyperkalemia** if given Succinylcholine (due to up-regulation of extrajunctional acetylcholine receptors), they do not have an increased genetic predisposition to MH itself. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign:** Increase in **EtCO₂** (End-tidal Carbon Dioxide) despite increasing ventilation. * **Most Specific Sign:** Muscle rigidity (especially Masseter Spasm). * **Drug of Choice:** **Dantrolene** (Mechanism: Acts on RYR1 to prevent calcium release). * **Safe Agents:** Propofol, Etomidate, Thiopentone, Ketamine, and all Non-depolarizing Neuromuscular Blockers (e.g., Vecuronium). * **Gold Standard Test:** Caffeine Halothane Contracture Test (CHCT).

Q: The caffeine-halothane test is used to diagnose which of the following conditions?

Malignant hyperthermia. **Explanation:** **Malignant Hyperthermia (MH)** is a pharmacogenetic hypermetabolic disorder of skeletal muscle triggered by volatile anesthetics (e.g., Halothane) and depolarizing muscle relaxants (Succinylcholine). The **Caffeine-Halothane Contracture Test (CHCT)** is the **gold standard (definitive) diagnostic test** for MH. It involves a muscle biopsy (usually from the vastus lateralis) where muscle strips are exposed to caffeine and halothane. In MH-susceptible individuals, the muscle fibers exhibit an exaggerated contractile response at lower concentrations compared to normal muscle due to a defect in the Ryanodine receptor (RYR1). **Analysis of Incorrect Options:** * **B. Neuroleptic Malignant Syndrome (NMS):** While clinically similar to MH (hyperthermia, rigidity), NMS is caused by dopamine antagonists (antipsychotics) and is not triggered by anesthetic gases. It does not show a positive CHCT. * **C. Thyrotoxicosis:** This is a hypermetabolic state due to excess thyroid hormone. While it can cause intraoperative tachycardia and hyperthermia, the underlying mechanism is hormonal, not a primary skeletal muscle calcium defect. * **D. King-Denborough Syndrome:** This is a rare congenital myopathy associated with MH susceptibility. While these patients are at high risk for MH, the CHCT is specifically used to diagnose the *susceptibility to Malignant Hyperthermia* itself, rather than the syndrome's dysmorphic features. **High-Yield Clinical Pearls for NEET-PG:** * **Earliest Sign of MH:** Increase in EtCO₂ (End-tidal Carbon Dioxide). * **Most Specific Sign:** Muscle rigidity (Masseter spasm). * **Drug of Choice:** **Dantrolene** (Mechanism: Inhibits calcium release from the sarcoplasmic reticulum by acting on RYR1). * **Genetic Mutation:** Most commonly involves the **RYR1 gene** on Chromosome 19. * **Safe Agents:** Propofol, Ketamine, Etomidate, and Nitrous Oxide.

Question 1

A patient was anesthetized with halothane and nitrous oxide, and tubocurarine was used for skeletal muscle relaxation. The patient became hypertensive with marked muscle rigidity and hyperthermia. Lab reports showed hyperkalemia and acidosis. This complication was caused by:

Accepted Answer

Excessive release of calcium from the sarcoplasmic reticulum

Answer

Block of autonomic ganglia by tubocurarine

Answer

Pheochromocytoma

Answer

Activation of brain dopamine receptors by halothane

Question 2

A patient is placed in the Trendelenburg position during surgery. What is the primary rationale for this positioning if an air embolism is suspected?

Accepted Answer

To keep a left ventricular air bubble away from the coronary artery ostia.

Answer

To trap air in the right ventricle.

Answer

To prevent air from passing through the foramen ovale.

Answer

To prevent air from entering the left ventricle.

Question 3

Which of the following is the first treatment for an anesthetized patient experiencing bronchospasm?

Accepted Answer

Administer additional anesthetic

Answer

Administer inhalational beta-2 agonists

Answer

Administer intravenous epinephrine

Answer

Administer neuromuscular blocking agent

Question 4

What is the commonest sign of aspiration pneumonitis?

Accepted Answer

Tachypnea

Answer

Cyanosis

Answer

Crepitations

Answer

Rhonchi

Question 5

A woman is posted for elective cholecystectomy. Her preoperative clinical evaluation and airway assessment were normal. In the operating room, she was attached to the monitors and an antibiotic was administered. Suddenly she became pulseless and unresponsive. What is the immediate next step in her management?

Accepted Answer

Start chest compressions

Answer

Check for breathing

Answer

Call for help/additional personnel

Answer

Give two rescue breaths

Question 6

A 35-year-old male developed a headache relieved by lying down two days after a surgical procedure. What is the definitive treatment for this condition?

Accepted Answer

Autologous blood patch

Answer

NSAIDs and caffeine

Answer

Physiotherapy

Answer

Caffeine

Question 7

Which of the following is NOT a risk factor for developing bronchospasm during anesthesia?

Accepted Answer

Old age

Answer

Perioperative respiratory infection

Answer

Endotracheal intubation

Answer

Presence of COPD

Question 8

Which disease is known to be associated with malignant hyperthermia?

Accepted Answer

Denborough syndrome

Answer

Huntington chorea

Answer

Fabry disease

Answer

Burns

Question 9

What is responsible for muscle pain after day care surgery when propofol and succinylcholine (Sch) are used?

Accepted Answer

Succinylcholine (Sch)

Answer

Propofol

Answer

Surgery

Answer

Early ambulation

Question 10

The caffeine-halothane test is used to diagnose which of the following conditions?

Accepted Answer

Malignant hyperthermia

Answer

Neuroleptic malignant syndrome

Answer

Thyrotoxicosis

Answer

King-Denborough syndrome

Complications in Anesthesia — MCQs

Complications in Anesthesia — MCQs

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