CPRS Case 5: MI Flashcards

1
Q

***Consent

A
  • Consent: implied or express
  • Oral consent is acceptable for minor invasive procedure, documentation offers protection for doctors
  • Express and specific consent is required for major treatment with significant risks

Consent is valid only if:

  • given voluntarily
  • doctor has provided proper explanation of nature, effect and risks of treatment
  • patient properly understands
  1. Ways in which valid consent can be given
    - non-verbally
    - orally
    - writing (written consent is evidence but not proof)
  2. Written consent
    - good practice:
    —> procedure is complex / significant risk
    —> involve general anaesthesia
    —> significant consequence on patients’ life
    - inability to sign can be documented in record
  3. Need for witness
    - witness is not mandatory
    - good practice:
    —> procedure is complex / significant risk
    —> significant consequence on patients’ life
    - witness should be involved in the whole process
  4. Reconfirmation of consent
    - when there is significant time lapse between signing and procedure
    - material changes in patient’s condition
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2
Q

***Steps to obtain informed consent

A
  1. Assess competence of patient
    - capable of understanding the information
    - capable of using and weighing
    - capable of communicating a decision
  2. Provide sufficient information
    - explanation in person / with aid of information leaflet
  3. Provide information particular to patient
    - nature of medical condition
    - available options include option not to treat + likely outcome
    - consequence
    - any uncertainty of doctor in his diagnosis
  4. Provide information about procedure
    - description
    - common risks and complications
    - uncommon risk with serious consequence
    - what to expect before and after
  5. Additional questions by patient
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3
Q

***20 categories in which doctor has to report death to coroner

A

Medical reasons:

  • medical cause is uncertain
  • septicaemia with unknown primary cause
  • operation which occurred within 48 hours after major operation
  • anaesthetic within 24 hours

Statutory reasons:

  • official custody
  • crime/ suspected crime
  • suicide

Personal reasons:

  • death of woman within 30 days after giving birth / abortion / miscarriage
  • still birth
  • occupational disease

Context:

  • accident/injury
  • death in private care premises
  • occurred outside HK where body is brought into HK
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4
Q

Anatomy of coronary arterial system

A

See lecture

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5
Q

Relationship between radius and flow for any blood vessels, and outline the factors regulating coronary blood flow in health and ischaemic heart disease

A

See lecture regulation of blood flow

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6
Q

Diagnosis of MI by cardiac enzymes with reference to their specificity for cardiac damage and time course of their release

A

See chem patho + biochem practical

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7
Q

Rationales for administering antiplatelet drugs and anticoagulants following MI

A

Acute plaque changes may lead to thrombosis —> thromboembolism

Anti-platelet drugs and anticoagulants is to prevent thrombosis of arteries and hence thromboembolism from occurring

  1. Aspirin: inhibits cyclooxygenase —> required for synthesis of thromboxane (for platelet activation)
  2. Clopidogrel: inhibit ADP P2Y12 receptor —> inhibit platelet aggregation by preventing activation of glycoprotein IIb/IIIa
  3. Low MW heparin: bind to antithrombin —> activate and accelerate antithrombin’s action to inhibit activated factor X
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8
Q

Pathological changes from MI

A

See lecture

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9
Q

Signs and symptoms of MI

A

Chest pain

  • rapid, sudden
  • provoked by activity, exercise, does not depend on resp / position
  • squeezing, tightness, pressure, constriction, crushing, burning
  • radiation to jaw, epigastrium, shoulders, arms
  • diffuse pain
  • prolonged and not relieved by rest / nitroglycerin
  • weak S1, splitted S2, S3, S4
  • Sympathetic activation: pallor, sweating, tachycardia
  • Parasympathetic activation: diarrhoea, vomiting, bradycardia
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10
Q

Distinguish between ACS, STEMI, NSTEMI

A

***ACS
—> ECG
—> ST elevation: STEMI
—> no ST elevation: necrosis biomarker +ve —> NSTEMI
—> no ST elevation: necrosis biomarker -ve —> unstable angina

NSTEMI: temporary / partial occlusion of coronary arteries —> subendocardial infarction
STEMI: develop from complete occlusion of coronary arteries —> transmural infarction

Symptoms: no difference

ECG:

  • NSTEMI: ST depression, T inversion, No ST elevation, ***No Q wave
  • STEMI: ST elevation, T inversion, Q wave present

Cardiac markers:
- elevation of cardiac markers are milder in NSTEMI than STEMI

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11
Q

Principles of management of myocardial infarction

A
  1. Correction of underlying risk factor
    - antihypertensive
    - lipid lowering drugs
  2. Anti-anginal treatment
  3. Antithrombotic treatment
    - antiplatelet / anticoagulant
  4. Reperfusion for STEMI
    - Primary PCI
    - thrombolytic therapy
  5. Reperfusion for NSTEMI
    - decide treatment according to risk
    - early coronary angiography / revascularisation
    - avoid thrombolytic therapy
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12
Q

Risk factors for Ischaemic heart disease

A

Non-modifiable

  • advanced age
  • male
  • genetics

Modifiable

  • high LDL, low HDL
  • hypertension
  • DM
  • smoking
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