Chapter 7 - Genito-urinary Flashcards
What is urinary incontinence?
Involuntary leakage of urine
4 main types of urinary incontinence?
1) Stress
2) Urgency
3) Mixed
4) Overflow
What happens in stress incontinence?
Involuntary leakage on exertion/effort e.g. sneezing/coughing - lack of pelvic floor support/urethral sphincter damage
What happens in urgency incontinence?
Involuntary muscle contractions that cause an urgency to pass urine (difficult to hold it in)
What happens in mixed incontinence?
Urgency + Stress (one is more predominant)
What happens in overflow incontinence?
Incomplete emptying of the bladder (frequent loss of small quantities of urine)
Situational incontinence may occur during certain activities e.g. sex/giggling. True or false?
True
Give some risk factors for incontinence.
Older age Obesity Pregnancy Vaginal delivery Constipation Smoking Family History Surgical removal which cause lack of support e.g. hysterectomy
State some drugs that can cause urinary incontinence.
Ace inhibitors –> cause a cough
A-blockers –> e.g. doxazosin relax the bladder and urethra
Which conditions can worse incontinence?
UTI Oestrogen deficiency Stroke Dementia Parkisons Diabetes Hypercalcaemia
What drugs can increase detrusor muscle activity and contribute to incontinence?
Cholinesterase inhibitors Anticholinergics Constipation causing drugs Diuretics Alcohol Caffeine
Lifestyle modifications for incontinence?
- reduce weight if obese (BMI>30)
- reduce caffeine intake
- modify fluids
- Strengthen pelvic muscles e.g. pelvic floor exercises
As 1st line for incontinence, bladder training is recommended. How long should this training be done until drug therapy can be initiated?
Urgency - 6 weeks
Stress - 3 months (8contractions TDS)
What would prompt you to do an urgent referral in women with incontinence?
> 45yrs and visible/persistent haematuria but no UTI (could be bladder cancer)
and
> 60yrs: non-visible haematuria + dysuria/increased white cells
What should be used 1st line for urgency incontinence?
Anticholinergics:
1) IR oxybutynin (also available as transdermal)
2) IR Tolterodine
3) Mirabegron
4) Solifenacin
5) MR Oxybutynin/MR tolterodine
6) Botox (paralyses portion of bladder)
If anticholinergics are not tolerated, what would be recommended as 2nd line?
Mirabegron (prolong QT and not for uncontrolled hypertension)
In what specific type of patient would anticholinergics e.g. oxybutynin not be suitable?
Frail, elderly as they are at risk of sudden physical/mental health deterioration.
How often should incontinence treatment be reviewed?
- every 4 weeks
- if tx is effective then review after 12 weeks
- then annually
- if >75yrs: every 6 months
Is duloxetine used 1st line for stress incontinence? why?
No - only use if pelvic floor training has failed
Only if mod-severe
Do not withdraw abruptly
What is nocturnal enuresis?
Involuntary urine discharge whilst asleep. Common in children upto 5yrs. Treatment initiated if still continues upto 7yrs.
1st line treatment for nocturnal enuresis in <5yrs?
Nil - reassure parents that it is self-limiting
Use bedwetting alarms
Non-drug therapy for nocturnal enuresis in <5yrs?
Bedwetting alarms (have a sensor that detect wetness which urges the child to get up and go to the bathroom) - use for 2 weeks and r/v in 4 weeks
1st line treatment for nocturnal enuresis in >5yrs when alarm is unsuitable?
1) desmopressin
2 - if no response) TCA - imipramine
Desmopressin counselling for children >5yrs using it for noctural enuresis?
Formulation: sublingual/oral
Side-effects: hyponatraemic convulsions as can dilute blood too much.
Counsel: - restrict fluid intake 1hr before and 8hrs after
- STOP in vomiting/diarrhoea
Give examples of some anti-muscarinic drugs.
Oxybutynin
Tolterodine
Solifenacin (max 5mg if egfr <30)
What drug class does mirabegron fall under?
Beta-3 agonist
Contra-indications for anti-muscarinic drugs?
angle-closure glaucoma GI obstruction Severe ulcerative colitis Toxic megacolon Urinary retention
Side-effects of antimuscarinic drugs?
Dry mouth blurred vision constipation dizzy/drowsy palpitations vomiting
Cautions and STOPP criteria for antimuscarinic drugs?
Caution: elderly
1) Treating EPS of antipsychotics (increased risk of antimusc toxicity)
2) With delirium/dementia (exacerbation of cognitive impairment)
3) 2/more antimusc drugs = risk of antimusc toxicity
Antimuscarinic drugs CAL
Can affect driving - do not drive/operate heavy machinery/tools
Antimuscaranics prolong QT, true or false?
True
What is the maximum dose of solifenacin in someone with an egfr < 30?
5mg
Which drug used for incontinence requires the use of effective contraception?
Mirabegron
if a patient is on mirabegron and is prescribed a CYP3A4 inhibitor, what dose reduction is required?
Normal dose mirabegron: 50mg OD
Concominant inhibitor/mild hepatic impairment: reduce dose to 25mg OD
Give examples of CYP3A4 inhibitors.
Sickfaces.com
Sodium valproate Isoniazide Clarithromycin/macrolides Ketoconazole/antifungals Fluconazole Alcohol Cimetidine Erythromycin Sulfonamides Ciprofloxacin Omeprazole Metronidazole
+ grapefruit juice, amiodarone, quinidine
What is urinary retention?
The inability to voluntarily urinate.
Drugs that can cause urinary retention?
Anti-muscuranics
Sympathomimetics
TCA
What is the most common cause of urinary retention in men?
BPH (benign prostatic hyperplasia) - enlarged prostate
How would you manage acute urinary retention?
inability to pass urine over hours (medical emergency).
1) immediately catheterise (give a-blocker 2 days before catheter)
Give examples of a-blockers.
DIPT Doxazosin Prazosin Indoramin (can exacerbate parkinsons) Tamsulosin (take ON)
What should be offered for mod-sev symptoms of urinary retention in men?
a-blockers e.g. tamsulosin, doxazosin
How often should a-blocker treatment be reviewed?
after 4-6weeks then every 6-12months
How do a-blockers work in BPH?
They relax smooth muscles in BPH causing an increase in urinary flow and an improvement in obstructive symptoms
What drug treatment would be recommended for those with an enlarged prostate, raised prostate specific antigen and at high risk of progression (eg elderly)?
5a-reductase inhibitors e.g. finasteride/dutasteride
use combo with a-blockers if symptoms are persistent
A-blockers side-effects and counselling?
e.g. tamsulosin/doxazosin: can cause postural hypotension (dizzy, blurred vision, tachycardia, palpitations)
Rare - SJS
Contra-indicated: postural hypotension
Counsel: 1st dose at bedtime due to PH, can make you drowsy so avoid driving/alcohol/heavy machinery
A doctor would like to switch a patient from IR doxazosin to MR, he asks if this requires a change in dose, what would you advise.
They are both bioequivalent so prescribe the same dose.
Usual dose of tamsulosin for BPH?
400mcg ON
Can tamusolin be sold OTC? If so, what are the conditions?
Yes.
Age: 45-75yr old men
Max: 6 weeks supply before doctor r/v
Pack size: 14 capsules
How do 5-alpha reductase inhibitors work?
Inhibit 5-a reductase that metabolises testosterone into its active form of dihydrotestosterone.
Side-effects of 5-a reductase inhibitors (dutasteride/finasteride)
1) Breast disorders - can cause male breast cancer so report lumps, pain/nipple discharge
2) Sexual dysfunction
Patient x has been initiated on finasteride and reports changes in texture of his nipple - what is this indicative of?
Breast cancer - report STAT
There is an MHRA warning with one of the 5-a reductase inhibitors, which is it and what does the warning state?
Finasteride
Risk of suicidal thoughts/depression - Stop STAT
What indication can 5-a reductase inhibitors be used for?
1) Urinary retention due to BPH - dutasteride/finasteride
2) Male pattern hair loss (androgenic alopecia) - (Not on NHS primary care) finasteride
what is the conception and pregnancy advice regarding 5-a reductase inhibitors?
1) Women of child-bearing age should avoid handling broken/crushed tablets
2) finasteride is excreted in semen and so condoms should be used if partner is pregnant/likely to become pregnant. (birth defects in male babies)
What are the 2 different types of contraception?
1) Combined
2) Progestogen only
What formulations are available for combined contraception?
- Oral
- Transdermal - Evra
- Vaginal ring - Nuva ring
What ingredients are in combined contraception?
Oestrogen and progestogen
Give examples of oestrogen in contraception?
Ethinylestradiol
Estradiol
Give examples of progestogen in contraception?
Levonorgestrel
Desogestrel
Norethisterone
What formulations are available for progestogen only contraception?
1) oral - deso/levo and norethisterone
2) parenteral - medroxyprogesterone, norethisterone injections
3) intrauterine device
What is the difference between monophasic and multiphasic preparations?
Monophasic - fixed amount of oestrogen and progestogen
Multiphasic - varying amounts of oestrogen and progestogen
Give examples of some common contraception brands that are combined?
Gedarel Femodette Loestrin Marvelon Yasmin Microgynon 30 Cilest Rigevidon
What contraception is considered ‘highly effective’?
Copper IUD
Levonorgestrel intrauterine system
Progestogen-only implant
If going for surgery, when should COC be stopped and restarted?
Stop 4 weeks prior and restart 2 weeks after full mobilisation.
How does combined oral contraception work?
Inhibits ovulation
How does Progestogen only contraception work?
alters (thickens) cervical mucus and prevents sperm penetration that could inhibit ovulation
How would you counsel a patient newly starting COC?
Once daily for three weeks followed by one-week pill free period for withdrawal bleed.
Start taking it anytime during the cycle. If taken on day 6 or later, use barrier method for seven days
COCs are contra-indicated in what age category?
Over 50yrs (risk of VTE/STROKE increases)
Risks of COCs?
1) VTE
2) Travel >3hrs - use stocking/compression socks
3) Cervical and breast cancer
4) Stroke
5) Liver dysfunction
6) High blood pressure (>160/95) - contraindicated
How many risk factors of VTE would prompt you to get a patient to avoid COCs?
2 or more