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  • Question 1 - In the ventricular myocyte action potential, depolarisation occurs through the opening of: ...

    Correct

    • In the ventricular myocyte action potential, depolarisation occurs through the opening of:

      Your Answer: Voltage-gated Na + channels

      Explanation:

      An action potential (AP) is initiated when the myocyte is depolarised to a threshold potential of about -65 mV, as a result of transmission from an adjacent myocyte via gap junctions. Fast voltage-gated Na+channels are activated and a Na+influx depolarises the membrane rapidly to about +30 mV. This initial depolarisation is similar to that in nerve and skeletal muscle, and assists the transmission to the next myocyte.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      9.5
      Seconds
  • Question 2 - Arterial baroreceptors are located primarily in which of the following: ...

    Incorrect

    • Arterial baroreceptors are located primarily in which of the following:

      Your Answer: Carotid sinus and right atrium

      Correct Answer: Carotid sinus and aortic arch

      Explanation:

      Arterial baroreceptors are located in the carotid sinus and aortic arch, and detect the mean arterial pressure (MAP). A decrease in MAP (such as in postural hypotension, or haemorrhage) reduces arterial stretch and decreases baroreceptor activity, resulting in decreased firing in afferent nerves travelling via the glossopharyngeal nerve (carotid sinus) and vagus nerve (aortic arch) to the medulla where the activity of the autonomic nervous system is coordinated. Sympathetic nerve activity consequently increases, causing an increase in heart rate and cardiac contractility, peripheral vasoconstriction with an increase in TPR, and venoconstriction with an increase in CVP and thus an increase in cardiac output and blood pressure. Parasympathetic activity (vagal tone) decreases, contributing to the rise in heart rate.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      9.6
      Seconds
  • Question 3 - Regarding ACE inhibitors, which of the following statements is CORRECT: ...

    Correct

    • Regarding ACE inhibitors, which of the following statements is CORRECT:

      Your Answer: Angiotensin-II receptor blockers are a useful alternative in patients who cannot tolerate ACE-inhibitors due a persistent cough.

      Explanation:

      ACE inhibitors should be used with caution in patients of Afro-Caribbean descent who may respond less well; calcium channel blockers are first line for hypertension in these patients. ACE inhibitors have a role in the management of diabetic nephropathy. ACE inhibitors are contraindicated in pregnant women. ACE inhibitors inhibit the breakdown of bradykinin; this is the cause of the persistent dry cough. Blocking ACE also diminishes the breakdown of the potent vasodilator bradykinin which is the cause of the persistent dry cough. Angiotensin-II receptor blockers do not have this effect, therefore they are useful alternative for patients who have to discontinue an ACE inhibitor because of persistent cough.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      26.5
      Seconds
  • Question 4 - What is the main mechanism of action of dopamine as an inotropic sympathomimetic: ...

    Incorrect

    • What is the main mechanism of action of dopamine as an inotropic sympathomimetic:

      Your Answer: Dopamine receptor agonist

      Correct Answer: Beta1-receptor agonist

      Explanation:

      Dopamine is a neurotransmitter and a metabolic precursor of the catecholamines. It acts on beta1-receptors in cardiac muscle increasing cardiac contractility, and increases renal perfusion by stimulating dopamine receptors in the renal vasculature. This is of benefit in cardiogenic shock where deterioration of renal function is common.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      11.2
      Seconds
  • Question 5 - Which of the following is most true of the sinoatrial node: ...

    Incorrect

    • Which of the following is most true of the sinoatrial node:

      Your Answer: It is located between the right atrium and ventricle near the atrial septum.

      Correct Answer: Frequency of depolarisation is increased by sympathetic stimulation.

      Explanation:

      Cardiac myocyte contraction is not dependent on an external nerve supply but instead the heart generates its own rhythm, demonstrating inherent rhythmicity. The heartbeat is initiated by spontaneous depolarisation of the sinoatrial node (SAN), a region of specialised myocytes in the right atrium close to the coronary sinus, at a rate of 100-110 beats/min. This intrinsic rhythm is primarily influenced by autonomic nerves, with vagal influences being dominant over sympathetic influences at rest. This vagal tone reduces the resting heart rate down to 60-80 beats/min. To increase heart rate, the autonomic nervous system increases sympathetic outflow to the SAN, with concurrent inhibition of vagal tone. These changes mean the pacemaker potential more rapidly reaches the threshold for action potential generation.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      38.8
      Seconds
  • Question 6 - When an elderly dehydrated patient is moved from a supine to a standing...

    Incorrect

    • When an elderly dehydrated patient is moved from a supine to a standing position, her heart rate increases. Which of the following accounts for the increase in heart rate upon standing:

      Your Answer: Decreased total peripheral resistance

      Correct Answer: Decreased venous return

      Explanation:

      On standing from a prone position, gravity causes blood to pool in veins in the legs. Central venous pressure (CVP) falls, causing a fall in stroke volume and cardiac output (due to Starling’s law) and thus a fall in blood pressure. Normally this fall in BP is rapidly corrected by the baroreceptor reflex which causes venoconstriction (partially restoring CVP), and an increase in heart rate and contractility, so restoring cardiac output and blood pressure. Impaired autonomic nervous activity in the elderly accounts for the greater likelihood of postural hypotension. Any symptoms of dizziness, blurred vision or syncope is due to a transient fall in cerebral perfusion that occurs before cardiac output and mean arterial pressure (MAP) can be corrected.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      11.6
      Seconds
  • Question 7 - Which of the following is NOT an adverse effect associated with statin therapy:...

    Incorrect

    • Which of the following is NOT an adverse effect associated with statin therapy:

      Your Answer: Hyperglycaemia

      Correct Answer: Aplastic anaemia

      Explanation:

      Adverse effects of statins include:, Headache, Epistaxis, Gastrointestinal disorders (such as constipation, flatulence, dyspepsia, nausea, and diarrhoea), Musculoskeletal and connective tissue disorders (such as myalgia, arthralgia, pain in the extremity, muscle spasms, joint swelling, and back pain), Hyperglycaemia and diabetes, Myopathy and rhabdomyolysis, Interstitial lung disease and Hepatotoxicity

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      20.1
      Seconds
  • Question 8 - A patient who was put on low molecular weight heparin for suspected DVT...

    Correct

    • A patient who was put on low molecular weight heparin for suspected DVT and was scheduled for an ultrasound after the weekend, arrives at the emergency department with significant hematemesis. Which of the following medications can be used as a heparin reversal agent:

      Your Answer: Protamine sulfate

      Explanation:

      The management of bleeding in a patient receiving heparin depends upon the location and severity of bleeding, the underlying thromboembolic risk, and the current aPTT (for heparin) or anti-factor Xa activity (for LMW heparin). As an example, a patient with minor skin bleeding in the setting of a mechanical heart valve (high thromboembolic risk) and a therapeutic aPTT may continue heparin therapy, whereas a patient with major intracerebral bleeding in the setting of venous thromboembolism several months prior who is receiving heparin bridging perioperatively may require immediate heparin discontinuation and reversal with protamine sulphate. If haemorrhage occurs it is usually sufficient to withdraw unfractionated or low molecular weight heparin, but if rapid reversal of the effects of the heparin is required, protamine sulphate is a specific antidote (but only partially reverses the effects of low molecular weight heparins). Clinician judgment and early involvement of the appropriate consulting specialists is advised.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      12.4
      Seconds
  • Question 9 - All of the following statement about the microcirculation are correct except: ...

    Incorrect

    • All of the following statement about the microcirculation are correct except:

      Your Answer: Arteriole vasoconstriction tends to cause an increase in absorption of fluid.

      Correct Answer: Over the capillary bed, there is a net absorption of fluid.

      Explanation:

      The hydrostatic pressure along the length of the capillary is usually greater than plasma oncotic pressure. As a result, there is a small net filtration of fluid from the capillary into the interstitial space. The regulation of blood flow into the microcirculation is via the vasoconstriction of small arterioles, which is activated by the sympathetic nervous system through numerous nerve endings in their walls. Unlike proteins, most ions and small molecules diffuse easily across capillary walls and thus the crystalloid osmotic pressure they exert is roughly the same on either side of the capillary wall. Because the plasma colloid osmotic pressure is higher than interstitial colloid osmotic, fluid is drawn intravascularly. A reduction of hydrostatic capillary pressure and transient increase in absorption of fluid is a result of arteriolar constriction.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      51.4
      Seconds
  • Question 10 - What is the main mechanism of action of flecainide: ...

    Correct

    • What is the main mechanism of action of flecainide:

      Your Answer: Blocks Na+ channels

      Explanation:

      Flecainide inhibits the transmembrane influx of extracellular Na+ ions via fast channels on cardiac tissues resulting in a decrease in rate of depolarisation of the action potential, prolonging the PR and QRS intervals. At high concentrations, it exerts inhibitory effects on slow Ca2+ channels, accompanied by moderate negative inotropic effect.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      6.3
      Seconds
  • Question 11 - Which of the following is the primary indication for loop diuretics? ...

    Incorrect

    • Which of the following is the primary indication for loop diuretics?

      Your Answer: Hypertension

      Correct Answer: Acute pulmonary oedema

      Explanation:

      Loop diuretics have long been the cornerstone of pulmonary oedema treatment, with furosemide being the most commonly used of these drugs. Premedication with drugs that decrease preload (e.g., nitro-glycerine [NTG]) and afterload (e.g., angiotensin-converting enzyme [ACE] inhibitors) before the administration of loop diuretics can prevent adverse hemodynamic changes.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      8.9
      Seconds
  • Question 12 - Digoxin is predominantly used for which of the following: ...

    Incorrect

    • Digoxin is predominantly used for which of the following:

      Your Answer: First line treatment for heart failure

      Correct Answer: Rate control in persistent and permanent atrial fibrillation

      Explanation:

      Digoxin is most useful for controlling the ventricular response in persistent and permanent atrial fibrillation and atrial flutter. Digoxin is usually only effective for controlling the ventricular rate at rest, and should therefore only be used as monotherapy in predominantly sedentary patients with non-paroxysmal atrial fibrillation. It is now rarely used for rapid control of heart rate, as even with intravenous administration, response may take many hours. Digoxin is reserved for patients with worsening or severe heart failure due to left ventricular systolic dysfunction refractory to combination therapy with first-line agents. Digoxin is contraindicated in supraventricular arrhythmias associated with accessory conduction pathways e.g. Wolff-Parkinson-White syndrome.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      49
      Seconds
  • Question 13 - The mechanism of action of abciximab is by: ...

    Correct

    • The mechanism of action of abciximab is by:

      Your Answer: Blocking the binding of fibrinogen to GPIIb/IIIa receptor sites

      Explanation:

      Abciximab is a glycoprotein IIb/IIIa inhibitors and prevents platelet aggregation by blocking the binding of fibrinogen to receptors on platelets.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      13.2
      Seconds
  • Question 14 - Which of the following is NOT a typical side effect of digoxin: ...

    Incorrect

    • Which of the following is NOT a typical side effect of digoxin:

      Your Answer: Diarrhoea

      Correct Answer: Hypokalaemia

      Explanation:

      Digoxin does not cause hypokalaemia, but hypokalaemia does potentiate digoxin toxicity. The adverse effects of digoxin are frequently due to its narrow therapeutic window and include: Cardiac adverse effects – Sinoatrial and atrioventricular block, Premature ventricular contractions, PR prolongation and ST-segment depressionNausea, vomiting and diarrhoeaBlurred or yellow visionCNS effects – weakness, dizziness, confusion, apathy, malaise, headache, depression, psychosisThrombocytopenia and agranulocytosis (rare)Gynaecomastia in men in prolonged administration

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      91.4
      Seconds
  • Question 15 - You are teaching a group of medical students about cardiovascular examination. You are...

    Incorrect

    • You are teaching a group of medical students about cardiovascular examination. You are discussing heart sounds and the cardiac cycle. Which of the following stages of the cardiac cycle occurs immediately after the aortic valve closes:

      Your Answer: Ventricular filling

      Correct Answer: Isovolumetric relaxation

      Explanation:

      Immediately after the closure of the semilunar valves, the ventricles rapidly relax and ventricular pressure decreases rapidly but the AV valves remain closed as initially the ventricular pressure is still greater than atrial pressure. This is isovolumetric relaxation. Atrial pressure continues to rise because of venous return, with the v wave of the JVP waveform peaking during this phase. Rapid flow of blood from the atria into the ventricles during the ventricular filling phase causes thethird heart sound, which is normal in children but, in adults, is associated with disease such as ventricular dilation.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      58.2
      Seconds
  • Question 16 - The Frank-Starling curve is shifted downhill in heart failure due to which of...

    Correct

    • The Frank-Starling curve is shifted downhill in heart failure due to which of the following?

      Your Answer: Decrease in contractility

      Explanation:

      The Frank–Starling mechanism states that the left ventricle can increase its force of contraction and hence stroke volume in response to increases in venous return and thus preload. Changes in afterload or inotropy cause the Frank–Starling curve to rise or fall. In heart failure, the Frank–Starling curve is shifted downward (flattened), requiring higher venous return and filling pressure to enhance contractility and stroke volume.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      53.7
      Seconds
  • Question 17 - Bendoflumethiazide may cause all of the following electrolyte imbalances EXCEPT for: ...

    Incorrect

    • Bendoflumethiazide may cause all of the following electrolyte imbalances EXCEPT for:

      Your Answer: Hypokalaemia

      Correct Answer: Hypocalcaemia

      Explanation:

      Common side effects of thiazide diuretics include:Excessive diuresis, postural hypotension, dehydration, renal impairmentAcid-base and electrolyte imbalanceHypokalaemia, hyponatraemia, hypomagnesaemia, hypercalcaemia, hypochloraemic alkalosisMetabolic imbalanceHyperuricaemia and goutImpaired glucose tolerance and hyperglycaemiaAltered plasma-lipid concentrationsMild gastrointestinal disturbances

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      24.8
      Seconds
  • Question 18 - For a tachyarrhythmia caused by shock, which of the following is the first-line...

    Correct

    • For a tachyarrhythmia caused by shock, which of the following is the first-line treatment:

      Your Answer: Synchronised DC shock

      Explanation:

      If there are any adverse symptoms, immediate cardioversion with synchronized DC shock is recommended. If cardioversion fails to stop the arrhythmia and the symptoms persist, amiodarone 300 mg IV over 10–20 minutes should be administered before attempting another cardioversion. The loading dosage of amiodarone is followed by a 24-hour infusion of 900 mg administered into a large vein.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      89.5
      Seconds
  • Question 19 - Regarding the heart sounds in the cardiac cycle, which of the following statements...

    Incorrect

    • Regarding the heart sounds in the cardiac cycle, which of the following statements is INCORRECT:

      Your Answer: The first heart sound is heard in early systole.

      Correct Answer: The third heart sound is caused by filling of an abnormally stiff ventricle in atrial systole.

      Explanation:

      Heart Sound – Phase of Cardiac Cycle – Mechanical Event:First heart sound – Start of systole – Caused by closure of the atrioventricular (mitral & tricuspid) valvesSecond heart sound – End of systole – Caused by closure of the semilunar (aortic and pulmonary) valvesThird heart sound – Early diastole – Caused by rapid flow of blood from the atria into the ventricles during the ventricular filling phaseFourth heart sound – Late diastole – Caused by filling of an abnormally stiff ventricle in atrial systole

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      107.5
      Seconds
  • Question 20 - Which of the following best characterizes the correct administration of amiodarone for a...

    Incorrect

    • Which of the following best characterizes the correct administration of amiodarone for a shockable rhythm in adults on advanced life support:

      Your Answer: Give 300 mg IV amiodarone after 3 shocks, and then every 3 - 5 minutes thereafter

      Correct Answer: Give 300 mg IV amiodarone after 3 shocks

      Explanation:

      After three shocks, 300 mg IV amiodarone should be administered. After five defibrillation attempts, a further dose of 150 mg IV amiodarone may be considered. If amiodarone is not available, lidocaine may be used as a substitute, but it should not be given if amiodarone has previously been administered.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      32.1
      Seconds
  • Question 21 - All of the following are indications for beta-blockers EXCEPT for: ...

    Correct

    • All of the following are indications for beta-blockers EXCEPT for:

      Your Answer: Prinzmetal's angina

      Explanation:

      Beta-blockers are contraindicated in Prinzmetal’s angina.Beta-blockers may be indicated in:HypertensionPheochromocytoma (only with an alpha-blocker)AnginaSecondary prevention after ACSArrhythmias including atrial fibrillationHeart failureThyrotoxicosisAnxietyProphylaxis of migraineEssential tremorGlaucoma

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      19.6
      Seconds
  • Question 22 - Regarding alteplase, which of the following statements is INCORRECT: ...

    Incorrect

    • Regarding alteplase, which of the following statements is INCORRECT:

      Your Answer: Alteplase must be given by continuous intravenous infusion.

      Correct Answer: Alteplase is commonly associated with hypotensive effects.

      Explanation:

      Alteplase is a recombinant tissue-type plasminogen activator (tPA), a naturally occurring fibrin-specific enzyme that has selectivity for activation of fibrin-bound plasminogen. It has a short half-life of 3 – 4  minutes and must be given by continuous intravenous infusion but is not associated with antigenic or hypotensive effects, and can be used in patients when recent streptococcal infections or recent use of streptokinase contraindicates the use of streptokinase.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      28.8
      Seconds
  • Question 23 - Which of the following drug classes may cause bronchoconstriction: ...

    Correct

    • Which of the following drug classes may cause bronchoconstriction:

      Your Answer: Beta-blockers

      Explanation:

      Beta-blockers, including those considered to be cardioselective, should usually be avoided in patients with a history of asthma, bronchospasm or a history of obstructive airways disease. However, when there is no alternative, a cardioselective beta-blocker can be given to these patients with caution and under specialist supervision. In such cases the risk of inducing bronchospasm should be appreciated and appropriate precautions taken.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      13.9
      Seconds
  • Question 24 - Which of the following describes the pulse pressure: ...

    Correct

    • Which of the following describes the pulse pressure:

      Your Answer: Systolic - diastolic pressure

      Explanation:

      During systole, the pressure in the left ventricle increases and blood is ejected into the aorta. The rise in pressure stretches the elastic walls of the aorta and large arteries and drives blood flow. Systolic pressure is the maximum arterial pressure during systole. During diastole, arterial blood flow is partly maintained by elastic recoil of the walls of large arteries. The minimum pressure reached before the next systole is the diastolic pressure. The difference between the systolic and diastolic pressure is the pulse pressure.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      84.7
      Seconds
  • Question 25 - At the start of the cardiac cycle, towards the end of diastole, all...

    Correct

    • At the start of the cardiac cycle, towards the end of diastole, all of the following statements are true EXCEPT for:

      Your Answer: The semilunar valves are open.

      Explanation:

      At the start of the cardiac cycle, towards the end of diastole, the whole of the heart is relaxed. The atrioventricular (AV) valves are open because the atrial pressure is still slightly greater than the ventricular pressure. The semilunar valves are closed, as the pressure in the pulmonary artery and aorta is greater than the ventricular pressures. The cycle starts when the sinoatrial node (SAN) initiates atrial systole.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      55
      Seconds
  • Question 26 - A 68-year-old man is being treated with digoxin for atrial fibrillation. When serum...

    Correct

    • A 68-year-old man is being treated with digoxin for atrial fibrillation. When serum digoxin levels are above the therapeutic range, he is at highest risk for developing digoxin toxicity if he also develops which of the following?

      Your Answer: Hypokalaemia

      Explanation:

      Predisposing factors for digoxin toxicity include hypoxia, hypercalcaemia, hypokalaemia and hypomagnesaemia There should also be care taken in the elderly who are particularly susceptible to digoxin toxicity. Hypokalaemia may be precipitated by use of diuretics. Hyponatremia can result in the development of other pathological disturbances, but it does not make digoxin toxicity worse.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      154.7
      Seconds
  • Question 27 - What is the main mechanism of action of dobutamine as an inotropic sympathomimetic:...

    Incorrect

    • What is the main mechanism of action of dobutamine as an inotropic sympathomimetic:

      Your Answer: Alpha2-receptor agonist

      Correct Answer: Beta1-receptor agonist

      Explanation:

      Dobutamine directly stimulates the beta1-adrenergic receptors in the heart and increases contractility and cardiac output with little effect on the rate. In addition action on beta2-receptors causes vasodilation.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      47
      Seconds
  • Question 28 - What is the effect of a positive inotrope on the Starling curve: ...

    Incorrect

    • What is the effect of a positive inotrope on the Starling curve:

      Your Answer: Causes a rightward shift along the curve

      Correct Answer: Shifts the curve upwards

      Explanation:

      Contractility (inotropy) is the intrinsic ability of cardiac muscle to develop force at a given muscle length. It is determined by the intracellular [Ca2+] and can be estimated by the ejection fraction. Increases in contractility cause an increase in stroke volume/cardiac output for any level of right atrial pressure or end-diastolic volume, and hence shift the Starling curve upwards. Decreases in contractility cause a decrease in stroke volume/cardiac output for any level of right atrial pressure or end-diastolic volume and hence shift the Starling curve downwards.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      93.5
      Seconds
  • Question 29 - Action potentials are transmitted from myocyte to myocyte via which of the following:...

    Incorrect

    • Action potentials are transmitted from myocyte to myocyte via which of the following:

      Your Answer: Purkinje fibres

      Correct Answer: Gap junctions

      Explanation:

      Action potentials are transmitted to adjacent myocytes via gap junctions.

    • This question is part of the following fields:

      • Cardiovascular
      • Physiology
      71.9
      Seconds
  • Question 30 - Regarding hypertensive crises, which of the following statements is CORRECT: ...

    Correct

    • Regarding hypertensive crises, which of the following statements is CORRECT:

      Your Answer: In a hypertensive emergency, blood pressure should be reduced by 20 - 25% within 2 hours.

      Explanation:

      A hypertensive emergency is defined as severe hypertension (blood pressure ≥ 180/110 mmHg) with acute damage to the target organs. Prompt treatment with intravenous antihypertensive therapy is generally required; over the first few minutes or within 2 hours, blood pressure should be reduced by 20 – 25%. Severe hypertension without acute target organ damage is defined as hypertensive urgency.; blood pressure should be reduced gradually over 24 – 48 hours with oral antihypertensive therapy. If blood pressure is reduced too quickly in the management of hypertensive crises, there is a risk of reduced organ perfusion leading to cerebral infarction, blindness, deterioration in renal function, and myocardial ischaemia.

    • This question is part of the following fields:

      • Cardiovascular
      • Pharmacology
      51.3
      Seconds

SESSION STATS - PERFORMANCE PER SPECIALTY

Cardiovascular (13/30) 43%
Physiology (4/12) 33%
Pharmacology (9/18) 50%
Passmed