Clinical: Male Sexual Dysfunction Flashcards
5 types of male sexual dysfunction
- Erectile dysfunction (ED)
- Hypogonadism
- Ejaculatory disorders
- Psychological issues
- Penile deformity
Define hypogonadism as a male sexual dysfunction
Low libido, decreased energy
3 types of ejaculatory disorders
- Premature
- Delayed
- Painful
2 erectogenic centers of the brain
- Medial preoptic area
- Hypothalamus paraventricular nucleus
Nervous pathway of erection
- Erectogenic centers
- Lumbosacral spinal cord
- Cavernoud nerves (S2-4)
- Smooth muscle relaxation in the copora cavernosa
- Arteries/arterioles
- Penile trabeculae
3 molecules involved in erection
- Nitric oxide
- cGMP
- PDE (phosphodiesterase)
Role of nitric oxide in erection
Release of 2nd messenger in the arteries of the corpus cavernosa
cGMP role in erection
2nd messenger to cause a decrease in intracellular Ca2++ –> smooth muscle relaxation –> erection
Role of PDE in erection
Detumescence (cGMP hydrolysis)
Concurrent risk associated with ED
Cardiovascular disease
5 domains examined in the International Inventory of Erectile Function (IIEF)
- Erectile function
- Orgasmic function
- Sexual desire
- Intercourse satisfaction
- Overall satisfaction
Describe how the SHIM score works
Score from 0 - 30 where higher = no ED and lower = increasing severity of ED
2 importants questions in the Androgen Deficiency in Aging Male (ADAM) questionnaire
- Do you have a decrease in sex drive
- Are your erections less strong
3 lab evaluations specific for ED
Testosterone
FSH
LH
3 other lab tests that can be used to evaluate male sexual dysfunction
- Lipid profile
- HbA1c
- Fasting glucose
4 roles of testosterone in sexual function
- Sexual desire and arousal
- Frequency of sexual activity
- Spontaneous erection
- Ejaculation and orgasm
Why not give men with ED exogenous testosterone
Exogenous T will decrease:
- Gonadotropins
- Spermatogenesis
NOTE: Testosterone may be potential male contraceptive
6 conditions commonly associated with ED
- Diabetes
- Heart disease
- Hypertension
- Low HDL levels (dyslipidemia)
- Smoking (in men with heart disease or hypertension)
- Depression
METs of sex
3 - 5 (but big inter-individual variation)
When is it safe to treat ED?
If patient has no symptoms for activities >5 METs
3 PDE5 inhibitors
- Sildenafil (Viagra)
- Tadalafil (Cialis)
- Vardenafil (Levitra)
Compare the time of peak concentration for the 3 PDE5 inhibitors
- Viagra = 1 hr
- Cialis = 2 hours (slowest)
- Levitra = 0.7 - 0.9 hours (shortest)
NOTE: Drug effects may be seen BEFORE peaks
compare the half-lives of the 3 PDE5 inhibitors
- Viagra = 4 hours
- Cialis = 17.5 hours
- Levitra = 4-5 hours
Which PDE5 inhibitors can affect food absorption (slow it down)
Viagra and maybe Levitra
4 common side effects that one can experience from ALL PDE5 inhibitors
- Headache
- Flushing
- Dyspepsia
- Nasal congestion
Common side effect that one can experience with sildenafil and vardenafil only
Altered vision
Common side effect of tadalafil only
Myalgia
Absolute contraindication of PDE5 inhibitors
Concomitant usage of nitroglycerine in any form
Why is nitroglycerine use contraindicated with PDE5 inhibitor use?
Any PDE5 inhibitor can potentiate the hypotensive effect of nitroglycerine and so you must not use them within the same 24 hour period (48 hours for tadalafil)
4 alternatives to PDE5 inhibitors to help rectify ED
- Vacuum pump
- MUSE (Medicated Urethral System for Erection)
- Intracavernous injection therapy
- Penile prosthesis
Pros of using vacuum pump
Cost-effective
Mechanical (no chemicals)
>80% effective
Cons of vacuum pump
Should not use for >30 min
Complications of bruising and discoloration of glans (>50% dropout rate)
Chemical used in MUSE
Prostaglandin E1
Pro of MUSE
No need for a needle
Con for MUSE
Only >50% effective
4 substances involved in intracavernous injection therapy
- Paperavine
- Prostaglandin
- Phentolamine
- Moxisylyte
4 complications of intracavernous injection therapy
- Pain
- Bleeding
- Fibrosis
- Priapism
2 pros of penile prosthesis
~100% effective and able to achieve orgasm
2 complications of penile prosthesis
Infection and mechanical failure
When is sex therapy effective?
ED is due to psychological issues that are easily accessible
When is sex therapy less effective
When ED is longstanding and is due to deep.complex psychological processes
Most common sexual complaint
Premature ejaculation
2 psychological treatments for premature ejaculation
Stop/start technique
Squeeze technique
Medication to treat premature ejaculation
SSRIs
Define retarded ejaculation
Delayed ejaculatoin, or no ejaculation
Define primary retarded ejaculation
Cause = psychogenic
Define secondary retarded ejaculation
Side effect of medication