Diving and depression
Antidepressants and Diving….
Dr K E Simpson BVM&S Cert VC PhD FANZCVSc DipECVIM-Ca MRCVS
Lately we've had quite a lot of calls regarding antidepressants and diving, so we
thought we'd put some information together. As we are all aware, the WRSTC diving medical requirements questionnaire asks if
the diver is taking any prescribed medications, and a positive response means
that a physician MUST assess the diver. However, even when approval is received from a physician, it is the dive professionals choice whether or not they
are willing to take the student. Bearing this in mind, we felt it was important to
highlight some of the issues to consider when faced with a potential student who is taking antidepressants.
In terms of danger to divers, medications usually play a secondary role, with the primary concern being the underlying condition for which the medication has
been prescribed. There is a paucity of research investigating the relationship
between various mental conditions and diving. However, some assumptions can
be made. For example, if the individual is severely depressed, suicidal, out of touch with reality or paranoid with delusions or hallucinations, they obviously
shouldn't dive. However, it is more common that we are faced with someone
who has been diagnosed with a depressive disorder, anxiety or phobia, and many of whom may be considered fit to dive. So what do these disorders mean, and
what considerations should we give to each individual?
Depressive disorders, which include depression (unipolar disorder) and manic
depression (bipolar disorder) are incredibly common affecting 10-19 million US
adults per year, with the highest percentage of cases being diagnosed in 25-44
year olds. Commonly known as clinical depression, these disorders are differentiated by short-term states of depressed mood or unhappiness by an
imbalance in the chemicals within the brain, known as neurotransmitters. Clinical
signs can include feeling down or empty; having reduced interest in activities that were once pleasurable; disturbed sleep and fatigue; changes in appetite; loss of
libido; difficulty in paying attention, concentrating or making decisions; feelings of
worthlessness and guilt and in some cases contemplation of suicide. In addition,
people suffering with bipolar disorder may alternate depressive episodes with manic ones, which may be demonstrated as periods of elation, racing thoughts,
poor judgment, recklessness and a tendency to be easily distracted. Treatment
of such disorders typically involves psychotherapy, antidepressants or both, and in the majority of cases (particularly unipolar depression) improvement is seen within
a few weeks. Fitness to dive will depend on the mental state of the individual,
how long they have been on medication, which medication(s) they are receiving
and whether or not they are in remission. In fact the UK Sports Diving Medical Committee Guidelines state that divers who are taking antidepressants must
satisfy the following criteria:
Patients should only dive on the newer antidepressants. The older tricyclics
reduce the fit threshold, can cause dysrhythmias and are sedative. At
standard dosages, modern antidepressants such as the SSRIs citalopram, fluoxetine and paroxetine have a low seizure rate of <0.1% compared with
the general population. They are also non-sedating and do not appear to
impair cognitive function.
They should only be on one psychotropic medication.
They should have been used for a minimum of three months before diving
to allow for resolution of side effects e.g. heightened arousal and anxiety.
The condition for which they were prescribed should have resolved and treatment should be in the maintenance phase. This means that they
should have returned to work and normal daily life.
There must be no history of upward mood swings associated with loss of judgement. For upward mood swings to be significant they have to be
persistent for at least four days with an unequivocal change in functional
mood observed by others. The symptoms include decreased need for
sleep, racing thoughts and excessive involvement in pleasurable activities that have a high potential for painful consequences. Thus a history
indicating loss of judgement with unrestrained buying sprees, sexual
indiscretions etc are incompatible with diving. Antidepressants are known to worsen this condition.
There is a significant relapse rate when stopping antidepressants.
Following withdrawal, further information regarding the patient's mental health will need to be obtained from the GP. The patient should also not
dive during the withdrawal phase. For short acting antidepressants such as
Paroxetine, the suggested period is six weeks.
In addition, there can be issues related to the specific medication. Drugs
frequently used to treat depression include three major classes: the selective
serotonin reuptake inhibitors (SSRIs), tricyclic/tetracyclic medications
(TCAs/TeCAs) and the monoamine oxidase inhibitors (MAOIs), along with a few
uniquely acting compounds. There are few studies examining alterations in drug metabolism or side effects with immersion, however, the general side effects are
known and these in themselves may present some issues in the aquatic
environment. Commonly prescribed SSRIs include:
Citalopram (Celexa, Cipramil, Paxoran) Fluvoxamine (Luvox, Faverin, Fevarin, Floxyfral)
Paroxetine (Paxil, Pexeva, Seroxat, Brisdelle, Rexetin) Fluoxetine (Prozac, Sarafem, Unprozy, Prozep, Oxsac, Fluzac-20,
Magrilan, Fluxetil, Flusac, Flumed, amongst others) Sertraline (Zoloft, Lustral, Deprax, Altruline, amongst others)
This group of drugs act to increase the extracellular level of serotonin by
inhibiting the reuptake into the presynaptic cell, and thereby increase the amount
available to bind to the postsynaptic receptor within the neuron. Common side effects include anxiety and restlessness (especially in the initial stages of therapy),
drowsiness and dizziness, dry mouth, tremor and increased bruising or bleeding
(this is a mild increase and typically not significant unless therapy is combined with aspirin or non-steroidal anti-inflammatory drugs such as ibuprofen,
diclofenac, sulfasalazine or piroxicam. However, barotrauma to sinuses, ears or
lungs may cause significant haemorrhage, and could exacerbate the bleeding phase of DCI. It is therefore recommended by some that the maximum depth
should be an EAD of 30m to minimise the risk of DCI and slight theoretical risk
that they might increase narcosis. In contrast, a recent study of hyperbaric
induced DCS demonstrated fewer manifestations of DCS in mice pre-treated with fluoxetine when compared with placebo and a decrease in the pro-inflammatory
cytokine IL-6, which served as a marker of systemic inflammation in DCS.
In general, provided divers are receiving only a single medication, are fully
functional (ie: able to drive, work etc) and their underlying disease is in remission,
most individuals would be considered fit to dive. However, other considerations should involve any other medications (even over the counter preparations such as
aspirin) and the planned dive depth. It is not advisable to suddenly discontinue
these medications as this can lead to a plethora of side effects.
Commonly prescribed MAOIs include:
Phenelzine (Nardil, Nardelzine) Tranylcypromine (Parnate, Jatrosom)
Isocarboxazid (Marplan)
By inhibiting MAO, these drugs prevent the breakdown of multiple
neurotransmitters such as serotonin, melatonin, noradrenaline (norepinephrine), adrenaline (epinephrine) and dopamine, thereby altering neurotransmission and
Common side effects include dizziness, drowsiness and less commonly tremor,
however, these are usually transient and resolve within the first few months of
therapy, and therefore in the stable patient unlikely to influence their ability to
dive. However, perhaps of more concern is the interaction with not only other medications, but also foods containing tyramine, which can lead to a hypertensive
crisis and be fatal. Foods particularly high in tyramine include (but is not limited
to) aged cheeses, cured meats, tofu, shrimp paste, soy sauce, coconut, peanuts, avocado, certain red wines, some yeast extracts and spoiled foods. Clinical signs
of hypertensive crisis include retinal haemorrhage, headache, vomiting, bloody
urine, nosebleed, chest pain and arrhythmia. In addition, combination with other drugs/foods which increase serotonin levels (such as SSRIs, Tramodol, St Johns
Wort, certain migraine medications (triptans) or stimulants such as cocaine,
methamphetamine, MDMA) can result in Serotonin Syndrome, which is
characterized by headache, confusion, agitation, hypomania, shivering, sweating, high heart rate, muscle twitches, vomiting and diarrhoea and even coma/death.
Therefore, if an individual wishes to dive on these medications they should be
questioned of any lifestyle changes/choices and monitored for signs of interactions (which manifest quickly after occurring).
In addition, it is not advisable to suddenly discontinue these medications as this can lead to a number of side effects.
Commonly prescribed TCAs and TeCAs
Doxepin (Adapin, Sinequan, Deptran) Nortriptyline (Aventyl, Pamelor, Sensoval, Norpress, Allegron,
Noritren, Nortrilen) Amitriptyline (Elavil, Endep, Levate, amongst others)
Desipramine (Norpramin, Pertofrane)
Amoxapine (Asendin) Loxapine (Loxapac, Loxitane, Adasuve) (typically used for Schizophrenia rather than depression)
Maprotiline (Deprilept, Ludiomil, Psymion)
Mazindol (Mazanor, Sanorex)
Mianserin (Bolvidon, Norval, Tolvon) also classified as a Noradrenergic and specific seratonergic antidepressant (NaSSA)
Setiptiline (Tecipul) also classified as a NaSSA
Mirtazepine (Remeron, Avanza, Axit, Mirtaz, Zispin) also classified as a NaSSA
Trazodone (Depyrel, Desyrel, Mesyrel, Molipaxin, Oleptro, Trazodil, Trazorel, Trialodine, Trittico) also a serontonin antragonist
and reuptake inhibitor (SARI)
TCAs can be used to treat depression, anxiety or chronic pain (ie: IBS). The dose
for chronic pain is typically much lower than the anti-depressant dose and with time side effects may be minimal. Therefore, it is important to establish which
condition is being treated, the drug dose and the length of time that the
individual has been medicated. As antidepressants TCAs and TeCAs are often used in combination with other agents or when other medications have proven
ineffective. They are associated with a greater frequency of side effects than the
second-generation (SSRIs, MAOI) medications. Side affects can include (but are
not limited to) marked drowsiness (especially in the initial phase of treatment), dizziness, dry mouth and occasionally burred vision. In some instances TCAs and
TeCAs can lead to an increased heart rate and lower the threshold for seizures; it
is for these reasons that it is often advised not to dive whilst receiving these medications. In addition, it is not advisable to suddenly discontinue these
medications as this can result in numerous withdrawal effects.
Other medications (many of these have serious side effects that could lead to a
fatality during diving):
Venlafaxine (Effexor, Efexor, Trevilor): This is a serotonin-noradrenaline reuptake inhibitor (SNRI) typically reserved for use when other treatments have
failed due to the greater frequency of side effects. Common side effects include headache, nausea, insomnia, drowsiness, dry mouth, constipation, sexual
dysfunction, sweating and nervousness. However, less common but potentially
worrisome side effects include, an increased bleeding tendency, a decreased seizure threshold, cardiac arrhythmias, delirium, pulmonary infiltration with
eosinophils (a white blood cell) and an increase in suicidal tendencies. In
addition, there is a high incidence of withdrawal syndrome associated with
cessation of this medication. This is thought to be due to its short half-life. Whilst the effect of immersion on this drugs half-life remains unknown, it is not
uncommon for drug metabolism to be increased, potentially putting the diver at
risk of withdrawal syndrome.
Bupropion (Wellbutrin, Zyban) can be used as an antidepressant, or an aide to stop smoking. It is unique in it's mode of action, and demonstrates fewer side
effects than most antidepressants. Unfortunately, one of the recognised side
effects is an increased incidence of seizures. It is for this reason it was temporarily
withdrawn from the market before being reintroduced with a lower recommended dosage. Other worrisome side effects include anxiety, dry mouth, vomiting,
dizziness, chest pain, elevated heart rate, increase blood pressure, fainting and
hallucinations. Topiramate (Topamax) is an anticonvulsant that may be prescribed for bipolar disorder, post-traumatic stress disorder, borderline personality, migraine and
addiction. Side effects can be widespread, and include seizure, hallucinations,
somnolence, nausea, disturbance in attention, impairment of motor skills,
bleeding tendencies, slowing of the heart and fainting. Valproic Acid (Depakote) is an anticonvulsant that can be prescribed for migraine, bipolar mania or epilepsy. Side effects are common and can include
(but are not limited to) bleeding tendencies, drowsiness, dizziness, nausea,
infection, seeing double, hallucinations, confusion, vertigo and pleural effusion (fluid within the chest cavity).
Methylphenidate (Ritalin) is a psychostimulant, which is typically prescribed for attention deficit disorder, but may also be given for depression, postural
orthostatic tachycardia disorder (markedly elevated heart rate when rising) and
narcolepsy. Side effects include anxiety/nervousness (especially when initially prescribed), depression, headaches, mania, rapid heart rate, hypertension and
suicidal ideation.
Buspirone (Buspar) is a psychotrophic drug typically prescribed to decrease anxiety. In some countries it is only licenced as a short-term medication as it is
associated with a plethora of side effects which can include elevated heart rate, chest pain, nervousness, dizziness, muscular pain, disturbance in attention,
confusion, anger, abnormal co-ordination, fainting, altered blood pressure (high
and low), muscle cramps, bruising, stroke, heart attack and hallucinations. Lithium (Lithonate, Eskalith, Lithobid, Lithane) is commonly prescribed for
the treatment of bipolar disorder, although it may be used to treat other diseases. Many authors advise not diving when on Lithium as the half-life is altered during
immersion, increasing the incidence of side effects, which can include seizure,
muscular weakness, drowsiness, slurred speech and balance problems.
In summary, depression is common, and in many circumstances people who are
diagnosed with depression or anxiety may be cleared for diving by either a physician or DMO. However, whether or not an instructor is happy to accept that
individual, as a student is still at the discretion of the instructor. In order to
minimise risks to the dive group the individual should be in remission (ie: free of signs of disease, mood swings or manic behaviour and back to a ‘normal life-style'
ie able to drive/work etc); they should be on monotherapy (one medication) and
should have been receiving a standard maintenance dose, without notable side
effects, for a prolonged period (at least 3 months). Lifestyle factors which could influence the drug metabolism/side effects should be discussed and older drugs
such as Lithium or the TCAs for which there is an increased risk of seizures should
be avoided. At no point should discontinuation/alteration of the treatment regime be recommended by anyone other than the physician.
References available upon request
Source: http://www.emsinternational.org/Articles/Diving%20and%20Depression.pdf
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