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General Mechanisms of Drug Action

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11/20/2011
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Introduction to Clinical Pharmacy–

a key role for pharmacists.

Year 3 Peradeniya University SOP

Dr Ian Coombes,

Clinical senior Lecturer - School of Pharmacy + Medicine,

University of Queensland, and Senior Pharmacist,

Safe Medication Practice Unit, Brisbane, Australia



Mrs Judith Coombes

Conjoint Lecturer - School of Pharmacy, University of

Queensland and Senior Education Pharmacist, Princess

Alexandra Hospital, Brisbane, Australia.

Content

• Introduction to Us and You

• What is clinical pharmacy and why do we need it

• Medicine management and patient journeys

• Adverse drug events – the problem

• Product versus patient focused services

• Perception of the profession

• Drivers for change –its development elsewhere

• Core practitioner skills, knowledge and attitudes,

• Plan for the next 6 weeks

Background - Queensland

700 km W - E





1900km

N-S

1.8Million

km2





4 M people

in Qld

Brisbane

Queensland









Brisbane

Comparisons

Sri Lanka (7 degrees N of equator) Australia (14 degrees S of equator)



66,000km2 7,600,000km2 (120x)



20 million people 20.3 million people (=)



8.5% >65 year 13.3% >65 yr (1.5 x)



3.7% GDP on healthcare 9.5% GDP on healthcare (2.5x)



$160M/ yr/ on free Health $80 BN/ yr/ Health



$42 /person/year on health $3,900/person/year on health



2 hospital beds/ 1000 people 3.6 hospital beds/ 1000 people



New 4 year pharmacy degree 4 year pharmacy degree



1000 hospital pharmacists, 14,000 pharmacists, 3000 hospital

Doctor order, pharmacist supply Separation of supply from ordering

Judith Coombes



• University Queensland

• Pre-registration (apprenticeship year) community

• District hospital (Rockhampton) 700km N

• UK hospitals 2 years, wards and dispensary

• PAH renal specialist pharmacist

• UK MSc (Clin Pharm) DI + research pharmacist

• PAH, 700 bed teaching, Drug use evaluation

• Conjoint Lecturer U of Qld + PAH education

Ian Coombes

• University of London – wanted be in advertising!

• Pre-registration year - London Hospital

• Junior training – London Hospital

• Working holiday in Brisbane, 2 hospitals

• Msc in Clin Pharm, ICU, renal, cardiac jobs - UK

• Manage Clinical Services + cardiac + PAC – PAH

• Safe Medication Practice Unit

• PhD

• State wide pharmacy + prescriber education

Perceptions of Pharmacists





How do others see us?

“They just count a few tablets”

“They just weigh and measure things”

“A bunch of shop-keepers”

“Tell me how and when to use the Medicine”

“Counter-prescribing”

“Not really health care practitioners – they’re

businessmen”

“Do you need a degree to be a pharmacist?”

Drivers for change

• Competence of health care practitioners

- Diploma to BSc to BPharm + Pre-registration +

registration

- Continuing Professional Development.

• Re-engineering of community medicine supply

- Provided by competent practitioners

- Recognition that dispensing is a technical function

• Informed general public – increased expectation

• Realisation that ………………….

Medicines are Dangerous

Pharmaceutical Care







“ A practice in which a practitioner takes

responsibility for a patient’s drug related

needs and holds him or herself

accountable for meeting these needs.”





Linda Strand 1997

Effective drug Will the patient take

Safe drug

therapy the therapy? therapy









Aims of

What does the

Pharmaceutical

patient view as an Care

improved quality of

life?







Improve Economic drug

quality of life therapy

A case

• 44 year old lady with fever and green sputum

and cough – no known previous medical history

– Diagnosed with upper resp. tract infection

• Prescribed: Pharmaceutical problems

– Co-Amoxiclav 1 tds Common organisms for URTI?

– Doxycycline 100mg D Need for atypical organism ?

– Prednisolone 40mg D History of asthma – risk vs benefit?

– Theophylline 200mg bd History asthma – risk vs benefit

– Omeprazole 20mg D Need for acid suppression?

– Metoclopramide 10mg tds Why is she nauseous ?

– Salbutamol 2 puff inhale prn Benefit of brochodilation?

Does she know what to take?

Will she take it?

Why did you choose to do this

course?







What do you envisage doing when

you become a pharmacist?



2 minutes talk to your neighbour and

then feedback

Question?



• Think of someone in your family or a friend

that has had something go “wrong” with their

medicines?

– Caused an adverse or unwanted effect ?

– Had medicines stopped when should have

continued?

– Not worked?

– What happened ?

– Could it have been avoided ?

Medical/medication errors in the UK



 Adverse events occur in 10% of admissions

 An estimated 850,000 adverse events a year

 Adverse events cost approximately £2 billion/yr

 The NHS pays £400 million clinical negligence

 Medication errors accounts for around a quarter

of the incidents which threaten patient safety

The Chief Medical Officer

An Organisation with a Memory

Department of Health (2000)

High Profile Examples

• A patient with leukaemia received Intrathecal vincristine

instead of intravenously. Died beginning of February

2001. 14th such case over the last 16 years.



• Patient being operated for a AAA received bupivicaine

intravenously rather than epidurally. Patient died 3 days

later.



• A 3 year old girl, who had a convulsion post flu vaccine.

Attended hospital to get “checked out”. Received nitrous

oxide instead of oxygen in casualty

High Profile Cases (Cont.)



• Elderly lady prescribed Methotrexate in 1997 for her

rheumatoid arthritis. Dose increased to 17.5mg

WEEKLY over a 6 month period.

• Jan 2000 patient undergoes right TKR in hospital. MTX

given as one tablet a week (only 2.5mg).

• 6th April 2000 patient asks GP to reduce number of

tablets “as in hospital”.

• Prescription for MTX 10mg/daily written and

dispensed.

• 30th April patient dies.

Deaths from medicines in the UK

1999 - 2000 (ICD9 & 10 data)









A spoonful of sugar - Audit Commission (2001)

So drugs are safe ………………..









Photosensitivity from Severe extravasation of

Amiodarone amiodarone infusion

NSAID or COX-2 induced peptic ulcer

Goitre – Hypothyroidism Bleeding due to

Secondary to Amiodarone anticoagulation

Erythemal rash from penicillin – in patient with a previous

Known allergy/ adverse drug reaction

Necrotising fascititis – secondary to infection at site of IV injection

Acute Liver failure from Black Cohosh - herbal medicine

Human Error

(Mistakes, Slips, Lapses)

• Error is inevitable due to “our” limitations:

- limited memory capacity

- limited mental processing capacity

- negative effects of fatigue other stressors

• We all make errors all the time

• Generalised lack of awareness that errors occur

• Patients suffer adverse events much more often

than previously realised

• Errors often NOT immediately observed

The same error, even a minor

one, can have quite different

consequences in different

circumstances.

The System:

Only as safe as it’s designed to be!







“I assumed the brown glass

ampoule was frusemide”



(ICU RN after injecting 10mg

adrenaline)

The Accident Causation Model

(Adopted from Reason & Dean)









Error Active

Latent Failures

producing

Conditions - Slips&lapses

conditions - Mistakes Accident









Defences

The Medicines Management Cycle



• What happens between a doctor seeing a

patient and them receiving or taking their

medicine ?



• 2 minutes discuss with neighbor

The Medicines Management Cycle

DOCTORS

Decision to

prescribe

Transfer

information Order entry





Monitor Review order

response Patient





Supply medicine

Administer



Supply

Distribute information





Nurses Pharmacy

From Bates et al 1995

Sources of Error

• Prescribing error - selecting the wrong or

inappropriate drug/dose/formulation/duration etc

• Communicating those instructions

• Supply error - timely; wrong drug, dose, route;

expired medicines, labelling.

• Administration error - timing; wrong route; wrong

rate/technique.

• Lack of user education - actions to take.

Where do things go wrong with medicines?

Comparability to Australian National

Health Priority Areas



In 2000-01, hospital admissions

– Angina: 88,500

– Myocardial infarction: 37,500

– Asthma: 49,000

– Diabetes: 46,000



– Adverse Drug Events: 140,000

Reducing the risk of adverse events

• Always

– include a detailed drug history in the consultation

• Only

– use drug treatment when there is a clear indication

• Stop

– drugs that are no longer necessary

• Check

– dose and response, especially in the young, elderly

and those with renal, hepatic or cardiac disease

Pharmaceutical Care







“ A practice in which a practitioner takes

responsibility for a patient’s drug related

needs and holds him or herself

accountable for meeting these needs.”





Linda Strand 1997

Effective drug Safe drug

therapy therapy









Aims of

Pharmaceutical

Care







Improve Economic drug

quality of life therapy

Aims of Pharmaceutical Care



• Identify actual and potential drug related

problems,



• Resolve actual drug related problems,



• Prevent potential drug related problems.

Drug therapy assessment

Six types of problems which may result in

treatment failure

:

1. Inappropriate selection of medication

2. Inappropriate formulation of medication

3. Inappropriate administration of drug therapy

4. Inappropriate medication-taking behaviour

5. Inappropriate monitoring of drug therapy

6. Inappropriate response to drug therapy

Pharmaceutical care planning





Process of work

– collect relevant patient information

– assess information

– identify problems

– state desired outcomes

– prioritise problems

– develop an action plan for each problem

– was desired outcome achieved?

Pharmaceutical Care Activities (1)



• Patient Consultation - discuss expectations

and concerns,

• Pharmacist’s assessment - identify current

or potential drug therapy problems,

• Creation of a care plan - establish goals of

therapy, action to be taken and outcomes to

be monitored.

• Communication of that plan eg Dr, nurse

other pharmacist, patient, carer

Pharmaceutical Care Activities (2)



• Patient education and/or referral –

• provide individualised, current information

about drug therapy and how to use;

Demonstrate special techniques; refer to

doctor or other HCP.

• Patient monitoring and follow-up –

• are the goals being met.

Refocusing the profession because :-



1. Problems caused by drug use in society,



2. Business orientated approaches place the

product before the patient,



Pharmaceutical care is :-



• a patient-centred approach (not drug-centred),

• a process of managing drug-related problems,

• Where pharmacists take responsibility for

provision of drug therapy.

Clinical Pharmacy Role in Reducing Risks

Admission medication history

Formulary

Prescribing protocols

Allergy check



Prospective review

Administration instructions

Clinical pharmacy

Drug distribution system









Opportunity

For Error

What if we are not there!

Admission medication history

Formulary

Prescribing protocols

Allergy check

Prospective review

Administration instructions

Clinical pharmacy



Drug distribution

system







Opportunity

For Error



Adapted by P.Thornton from J. Reason, 9/01

Outcomes of Pharmaceutical Care(1)



• The patient receives effective drug

therapy - based on the evidence of current

medical literature (Evidence based Medicine).



• The patient receives safe therapy - based

on a knowledge of their individual clinical

circumstances.

Outcomes of Pharmaceutical Care(2)



• The patient receives the most economic

therapy - not compromising efficacy or

toxicity



• The patient receives drug therapy desired

to improve their quality of life.

Patient Assessment Questions



• Does the patient need this drug ?

• Is this drug the most effective and safe ?

• Is this dosage the most effective and safe ?

• If side effects are unavoidable does the patient

need additional drug therapy for these side effects?

• Will drug administration impair safety or efficacy ?

• Are there any drug interactions ?

• Will the patient comply with prescribed regimen ?

To be a drug expert society needs

practitioners who ……..…

Key knowledge, skills and attributes

Knowledge base

• Chemistry,

• Pharmaceutics,

• Pharmacology,

• Therapeutics,

• Law, Ethics, Professional conduct.



Skills base

• Problem solvers,

• Make decisions,

• Good communication + Effective consultation process,

• Gather information,

• Calculate doses,

• Offer advice that’s timely and accurate (Pts, Dr’s and Nurses),

• Dispense medicines,

• Monitor and follow up

Key knowledge, skills and attributes



Attributes

• Takes responsibility for actions;

• Punctual;

• Caring nature;

• Professional behaviour;

• Open minded;

• Positive attitude;

• Treats patients equally;

• Treats information confidentially;

Key Responsibilities

1. Act in the interest of patients and seek to provide the

best possible health care for the community.

– Treat all with courtesy, respect and confidentiality.

– Respect patients’ rights to participate in decisions about their

care

– Provide information which can be understood.

2. Must ensure that their knowledge, skills and

performance are of high quality, up to date, evidence

based and relevant.

3. Behave with integrity

– adhere to accepted standards of personal and professional

conduct

Summary

• Drugs are beneficial but can also cause harm.

• Society needs a gatekeeper who manages the

use of drugs.

• Pharmacists must adopt a patient focused

approach to identifying and resolving drug

related issues.

• The consultation process and effective

communication lies at the heart of achieving this.

Plan for next 6 weeks



• Topics:

– Abbreviations,

– Evidence based medicine

– Medication history taking, confirmation, reconciliation

– Effective communication with other clinical staff

– Therapeutic – c-vasc, respiratory, renal, neurology (pain) ,

gastro

• Teaching and learning methods:

– Didactic, set some tasks, feedback go through in tutorials

The End

Any Questions?



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