HKCA Fellowship Primary Examination - MCQ (Hong Kong)

Which of the following structures passes through the diaphragm at the level of the tenth thoracic vertebra (T10)?

• AAorta
• BEsophagus
• CInferior vena cava
• DThoracic duct

In the brachial plexus, which spinal nerves contribute to the formation of the posterior cord?

• AC5 and C6 only
• BC7 and C8 only
• CC8 and T1 only
• DC5, C6, C7, C8, and T1

The artery of Adamkiewicz (arteria radicularis magna) most commonly arises from the aorta on the left side between which spinal segments?

• AT3 and T5
• BT5 and T8
• CT9 and L2
• DL3 and L5

Which of the following correctly defines coronary artery dominance?

• AThe origin of the posterior descending artery (PDA) from either the right or left coronar…
• BThe coronary artery that supplies the majority of blood flow to the left ventricle
• CThe coronary artery that gives rise to the sinoatrial (SA) nodal artery
• DThe coronary artery with the largest diameter at its ostium

What is the typical anatomical relationship of the internal jugular vein (IJV) relative to the common carotid artery in the middle of the neck?

• AAnteromedial
• BAnterolateral
• CPosteromedial
• DPosterolateral

During a retrobulbar block, the local anesthetic is injected directly into the muscle cone of the eye. Which nerve lies inside this cone and is at direct risk of injury?

• ATrochlear nerve (CN IV)
• BFacial nerve (CN VII)
• COptic nerve (CN II)
• DFrontal nerve (branch of CN V1)

What is the correct arrangement of the neurovascular bundle in the intercostal space, from superior to inferior, and its location relative to the rib?

• AVein, Artery, Nerve (VAN) running along the lower border of the upper rib
• BNerve, Artery, Vein (NAV) running along the lower border of the upper rib
• CVein, Artery, Nerve (VAN) running along the upper border of the lower rib
• DArtery, Vein, Nerve (AVN) running in the middle of the intercostal space

The ligamentum flavum, which must be penetrated to enter the epidural space, is characterized by which anatomical feature?

• AIt consists predominantly of collagen fibers, providing high tensile strength
• BIt contains a high proportion of elastic fibers, giving it a yellow color and elasticity
• CIt is located anterior to the dura mater and forms the anterior boundary of the vertebral…
• DIt is a thin, translucent membrane that lacks vascularity

Which nerve provides sensory innervation to the larynx above the level of the vocal cords?

• AExternal branch of the superior laryngeal nerve
• BGlossopharyngeal nerve (CN IX)
• CInternal branch of the superior laryngeal nerve
• DRecurrent laryngeal nerve

What is the correct anatomical position of the femoral nerve within the femoral triangle relative to the femoral sheath and femoral artery?

• AInside the femoral sheath, medial to the femoral artery
• BInside the femoral sheath, lateral to the femoral artery
• COutside the femoral sheath, medial to the femoral artery
• DOutside the femoral sheath, lateral to the femoral artery

The stellate ganglion (cervicothoracic ganglion) is formed by the fusion of which sympathetic structures, and where is it anatomically located?

• AThe inferior cervical ganglion and the first thoracic ganglion; located anterior to the t…
• BThe superior and middle cervical ganglia; located anterior to the transverse process of C6
• CThe middle cervical ganglion and the inferior cervical ganglion; located anterior to the…
• DThe first and second thoracic ganglia; located posterior to the neck of the first rib

In the majority of adults, the spinal cord terminates as the conus medullaris at which anatomical vertebral level?

• ALower border of L3
• BLower border of L1 or upper border of L2
• CLower border of S1
• DLower border of T12

At which anatomical location does the thoracic duct typically terminate and empty its lymph into the venous circulation?

• AJunction of the right internal jugular and right subclavian veins
• BSuperior vena cava
• CJunction of the left internal jugular and left subclavian veins
• DLeft brachiocephalic vein

Which spinal nerve roots contribute to the formation of the sciatic nerve?

• AL1, L2, L3, and L4
• BL2, L3, L4, and L5
• CL3, L4, L5, S1, and S2
• DL4, L5, S1, S2, and S3

The radial nerve is particularly vulnerable to compression or injury in which anatomical location, leading to the clinical presentation of wrist drop?

• AIn the spiral groove of the humerus
• BIn the carpal tunnel
• CAs it passes posterior to the medial epicondyle of the humerus
• DIn the cubital tunnel

At which anatomical vertebral level is the cricoid cartilage located in a normal adult?

• AFourth cervical vertebra (C4)
• BSixth cervical vertebra (C6)
• CSecond cervical vertebra (C2)
• DFirst thoracic vertebra (T1)

Which of the following describes the anatomical differences between the right and left main bronchi in an adult?

• AThe right main bronchus is longer, narrower, and more horizontal than the left
• BThe left main bronchus is shorter, wider, and more vertical than the right
• CThe right main bronchus is shorter, wider, and more vertical than the left
• DThe left main bronchus is longer, wider, and more vertical than the right

In the majority of adults, the dural sac (containing cerebrospinal fluid) terminates at which anatomical vertebral level?

• ALower border of L1
• BLower border of S2
• CLower border of L3
• DLower border of S4

Which structure forms the roof of the sacral hiatus and must be pierced during the performance of a caudal epidural block?

• ASacrococcygeal ligament
• BLigamentum flavum
• CPosterior longitudinal ligament
• DSupraspinous ligament

The coeliac plexus lies anterolateral to the aorta at which vertebral level, and what are its primary vascular relations?

• AL3 level, posterior to the renal arteries
• BT12 level, lateral to the splenic artery
• CL1 level, surrounding the origins of the coeliac trunk and superior mesenteric artery
• DL2 level, anterior to the inferior vena cava

According to the Frank-Starling law of the heart, what is the primary determinant of myocardial stroke volume?

• AAfterload, represented by systemic vascular resistance
• BEnd-diastolic volume (preload), which determines myocardial fiber stretch
• CHeart rate, which dictates diastolic filling time
• DMyocardial contractility (inotropic state) independent of fiber length

How is coronary perfusion pressure (CPP) calculated, and when does the majority of left ventricular myocardial perfusion occur?

• ACPP = Mean Arterial Pressure - Right Atrial Pressure; occurs during systole
• BCPP = Systolic Arterial Pressure - Left Ventricular End-Diastolic Pressure; occurs during…
• CCPP = Diastolic Arterial Pressure - Left Ventricular End-Diastolic Pressure; occurs durin…
• DCPP = Mean Arterial Pressure - Pulmonary Capillary Wedge Pressure; occurs during diastole

Which of the following shifts the oxygen-hemoglobin dissociation curve to the right, thereby facilitating the unloading of oxygen to peripheral tissues?

• AIncreased PaCO2, increased H+ (decreased pH), increased temperature, and increased 2,3-DPG
• BDecreased PaCO2, decreased H+ (increased pH), decreased temperature, and decreased 2,3-DPG
• CIncreased carbon monoxide level (carboxyhemoglobin) and decreased temperature
• DFetal hemoglobin (HbF) expression and decreased PaCO2

What is the primary method by which carbon dioxide (CO2) is transported in the blood?

• ADissolved in plasma as gas
• BBound to hemoglobin as carbamino compounds
• CBound to plasma proteins
• DAs bicarbonate ions (HCO3-) in the plasma

Pulmonary surfactant, produced by Type II alveolar cells, increases lung compliance primarily by which mechanism?

• AIncreasing mucosal blood flow and warming inspired air
• BReducing alveolar surface tension, especially at low lung volumes
• CConstricting alveolar ducts to reduce anatomical dead space
• DInhibiting the action of alveolar macrophages

Which of the following conditions characterizes West Zone 1 of the lung, and what is its physiological significance?

• AAlveolar pressure exceeds arterial pressure, which exceeds venous pressure (PA > Pa > Pv)…
• BArterial pressure exceeds alveolar pressure, which exceeds venous pressure (Pa > PA > Pv)…
• CArterial pressure exceeds venous pressure, which exceeds alveolar pressure (Pa > Pv > PA)…
• DAlveolar pressure exceeds venous pressure, which exceeds arterial pressure (PA > Pv > Pa)…

What is the primary physiological stimulus for central chemoreceptors in the control of ventilation?

• AA decrease in arterial PaO2 below 60 mmHg
• BA decrease in arterial pH (metabolic acidosis)
• CAn increase in hydrogen ion (H+) concentration in the brain interstitial fluid and cerebr…
• DAn increase in blood lactic acid levels

Over what range of mean arterial pressure (MAP) is renal blood flow (RBF) autoregulated in a normotensive adult, and what is the primary mechanism involved?

• A50 to 150 mmHg; mediated by sympathetic nervous system tone
• B80 to 180 mmHg; mediated by myogenic response and tubuloglomerular feedback
• C60 to 140 mmHg; mediated by renin-angiotensin-aldosterone system activation
• D100 to 200 mmHg; mediated by antidiuretic hormone (ADH) secretion

Which of the following conditions is a cause of high anion gap metabolic acidosis?

• ASevere diarrhea
• BRenal tubular acidosis (RTA)
• CNormal saline (0.9% NaCl) hyperinfusion
• DDiabetic ketoacidosis (DKA)

What is the typical rate of cerebrospinal fluid (CSF) production in an adult, and where is the primary site of absorption?

• A0.1 mL/min; absorbed primarily by the choroid plexus of the third ventricle
• B1.5 mL/min; absorbed primarily by the lymphatic channels of the cervical neck
• C0.35 mL/min; absorbed primarily by the arachnoid granulations into the dural venous sinus…
• D0.7 mL/min; absorbed primarily by the ependymal lining of the lateral ventricles

Within the physiological range, how does cerebral blood flow (CBF) respond to changes in arterial carbon dioxide tension (PaCO2)?

• ACBF changes linearly and in the same direction as PaCO2 changes between 20 and 80 mmHg
• BCBF is unaffected by PaCO2 changes due to tight autoregulation
• CCBF increases when PaCO2 decreases due to cerebral vasodilation
• DCBF changes exponentially with changes in PaCO2

What is the physiological cause of miniature end-plate potentials (MEPPs) recorded at the neuromuscular junction?

• AThe arrival of a subthreshold action potential at the presynaptic terminal
• BThe spontaneous release of a single quantum (acetylcholine vesicle) from the presynaptic…
• CThe opening of individual voltage-gated sodium channels on the postjunctional membrane
• DThe action of acetylcholinesterase degrading residual acetylcholine in the synaptic cleft

Which ionic movement is primarily responsible for Phase 0 (rapid depolarization) of the action potential in a ventricular cardiac myocyte?

• ARapid influx of sodium ions (Na+) through fast voltage-gated sodium channels
• BSlow influx of calcium ions (Ca2+) through L-type calcium channels
• CRapid efflux of potassium ions (K+) through transient outward potassium channels
• DActive transport of sodium and potassium by the Na+/K+ ATPase pump

Which of the following statements regarding the blood supply to the liver is correct?

• AThe hepatic artery provides 75% of hepatic blood flow and 50% of the oxygen supply
• BThe portal vein provides 25% of hepatic blood flow and 90% of the oxygen supply
• CThe hepatic portal vein is a high-pressure system that drains directly into the inferior…
• DThe portal vein provides approximately 75% of the total hepatic blood flow and 50-70% of…

What is the physiological cause of the 'physiological anemia of pregnancy' observed at term?

• AInadequate dietary iron absorption leading to microcytic anemia
• BA decrease in absolute red blood cell mass due to bone marrow suppression
• CA disproportionate increase in plasma volume relative to the increase in red blood cell m…
• DExcessive blood loss during early placental development

Which physiological changes immediately follow birth to trigger the closure of the ductus arteriosus in a neonate?

• AAn increase in pulmonary vascular resistance and a decrease in systemic vascular resistan…
• BAn increase in arterial oxygen tension (PaO2) and a decrease in circulating prostaglandin…
• CA decrease in left atrial pressure and an increase in right atrial pressure
• DAn increase in circulating adenosine levels and hypoxemia

Which of the following cardiovascular changes is characteristic of normal aging?

• ADecreased beta-adrenergic receptor responsiveness and decreased arterial compliance
• BIncreased maximal heart rate and increased ventricular compliance
• CDecreased systemic vascular resistance and increased parasympathetic tone
• DIncreased resting cardiac index and decreased myocardial wall thickness

How does mild to moderate hypothermia (core temperature 33-35°C) affect coagulation and the oxygen-hemoglobin dissociation curve?

• AIt accelerates coagulation cascade enzymes and shifts the oxygen-hemoglobin curve to the…
• BIt has no effect on coagulation but shifts the oxygen-hemoglobin curve to the left
• CIt impairs coagulation cascade enzyme activity and shifts the oxygen-hemoglobin curve to…
• DIt decreases platelet activation but shifts the oxygen-hemoglobin curve to the right

Which of the following endocrine and metabolic responses is characteristic of the stress response to major surgery?

• AIncreased insulin secretion and generalized anabolism
• BDecreased cortisol secretion and sodium excretion
• CDecreased antidiuretic hormone (ADH) secretion and water loss
• DIncreased secretion of cortisol, catecholamines, and aldosterone, with associated catabol…

According to the cell-based model of coagulation, where does the 'initiation' phase of thrombin generation occur?

• AOn the surface of activated platelets
• BOn the surface of tissue factor (TF)-bearing cells exposed after vascular injury
• CFree in the circulating plasma without cellular interaction
• DOn the endothelial lining of healthy, intact blood vessels

Which of the following best defines the context-sensitive half-time of an intravenous anesthetic agent?

• AThe time required for the total body store of the drug to decrease by 50% after a bolus d…
• BThe time required for the drug's plasma concentration to decrease by 50% during a continu…
• CThe time required for the plasma concentration of a drug to decrease by 50% after discont…
• DThe time required for the effect-site concentration of a drug to equal the plasma concent…

Which of the following factors decreases the minimum alveolar concentration (MAC) of an inhalational anesthetic agent, thereby increasing its potency?

• APregnancy, advancing age, acute ethanol ingestion, and hypothermia
• BChronic ethanol abuse, hypernatremia, and hyperthermia
• CThyrotoxicosis and red hair
• DAnxiety and cocaine abuse

What is the physical basis of the 'second gas effect' during the induction of inhalational anesthesia?

• AThe second gas chemically reacts with the primary gas to form a more potent compound
• BThe rapid uptake of a large volume of the primary gas (e.g. nitrous oxide) concentrates t…
• CThe second gas increases cardiac output, accelerating alveolar delivery
• DThe second gas decreases the blood-gas partition coefficient of the primary gas

Which cluster of clinical and laboratory abnormalities is characteristic of Propofol Infusion Syndrome (PRIS)?

• ARespiratory alkalosis, hypokalemia, and hypolipidemia
• BMetabolic alkalosis, hypercalcemia, and hypertension
• CLactic acidosis, rhabdomyolysis, hyperkalemia, hypertriglyceridemia, and cardiac failure
• DHypoglycemia, thrombocytosis, and hypernatremia

What is the primary mechanism of action of ketamine, and what are its characteristic cardiovascular effects?

• AGABAA receptor agonist; causes myocardial depression and vasodilation
• BAlpha-2 adrenergic agonist; causes bradycardia and hypotension
• CNon-competitive NMDA receptor antagonist; causes indirect sympathetic stimulation leading…
• DVoltage-gated sodium channel blocker; causes antiarrhythmic effects

Etomidate is frequently chosen for its hemodynamic stability, but its use is limited by transient adrenal suppression. What is the mechanism of this side effect?

• AInhibition of the enzyme 11-beta-hydroxylase in the adrenal cortex
• BDirect destruction of adrenal cortical cells
• CBlockade of ACTH receptors in the anterior pituitary gland
• DInhibition of cholesterol uptake by the liver