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Doctor insights on: Diving Reflex

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Can the eye have an automatic closing reflex when it senses danger?

Can the eye have an automatic closing reflex when it senses danger?

Yes!: Cranial nerve v innervates the face (including eyelash sensation and cornea) and causes a blink reflex when stimulated. ...Read more

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Blocked ear after scuba diving?

Blocked ear after scuba diving?

Equlization problem: you could have ,impacted wax,or a perforated ear drum [baro trauma] or eustachian tube dysfunction preventig you from equalizing the pressure in the middle ear .You need to be examined ...Read more

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I'm ocular hypertensive, iop at base 16 (controlled). Does weightlifting increase eye pressure? What about normal breathing vs valsalva maneuver?

I'm ocular hypertensive, iop at base 16 (controlled). Does weightlifting increase eye pressure? What about normal breathing vs valsalva maneuver?

Yes but . .: Weightlifting, breath holding and being upside down will cause an increase in the pressure in the eye temporarily. So also will rubbing the eyes and any other activity which puts actual pressure on the eye. These effects are temporary and your having controlled glaucoma should not be an issue. Pressure has to be elevated for a long time to cause damage. ...Read more

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Why hyperactive deep tendon reflex occure in hypocalcemia?

Why hyperactive deep tendon reflex occure in hypocalcemia?

Spastic muscles : Muscles get "tetanic" when there isn't enough calcium. They contract more easily because the decreased calcium affects contractility of muscle fibers. ...Read more

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Does naval aviation lead to spontaneous pneumothorax?

Does naval aviation lead to spontaneous pneumothorax?

Rare: In normal patients aviation does not lead to spontaneous pneumothorax. In people who have bullous disease or blebs (abnormal lung tissue that form large air sacs) pressure changes may lead to a higher risk of spontaneous pneumothorax. A person who already has had an episode of pneumothorax has as high as a 50% chance of having a recurrence without definitive treatment.. ...Read more

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Is hypersensitive gag reflex related to MS?

Is hypersensitive gag reflex related to MS?

Not likely: Multiple sclerosis is a disorder affecting various areas of brain, spinal cord, and eyes, with differing events over time. An isolated gag reflex change is not suggestive of MS, and could well represent biological sensitivity variations. If this is a problem affecting eating or swallowing, might have your doctor evaluate. ...Read more

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Slow reflex in foot?

Slow reflex in foot?

Slow foot reflex: Suggests possible nerve compression in lumbar or sacral spine, which could result from bulging/ruptured disc, bone spur compressing spinal cord or nerve root, or spinal stenosis. Suggest seeing orthopedic or neurosurgeon for evaluation, tests (including mri), options for treatment. If u have foot drop or similar problems, do not delay. Sooner the treatment, less damage. ...Read more

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Could aircraft altitude change trigger heart palpitations?

Could aircraft altitude change trigger heart palpitations?

Yes: Commercial airliners are usually pressurized at about 10, 000 feet, which is high enough to reduce the oxygen tension mildly. This can sometimes trigger palpitations in susceptible individuals. ...Read more

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Is Chest expnasion of 5cm (currently 3cm while inhalation) while inhalation possible by deep breathing exercises using lung exerciser in 1-2 months?

Is Chest expnasion of 5cm (currently 3cm while inhalation) while inhalation possible by deep breathing exercises using lung exerciser in 1-2 months?

Chest expansion: Hello ~ your question as written is difficult to understand but if I do, you are asking if your lungs vital capacity will improve with deep breathing and lung exerciser. Yes it will but to a max predetermined by your body size When the chest gets bigger for body builders that is muscle on the outside and not much increase in lung volumes. If that does not answer resubmit question thx ...Read more

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Can increased icp from valsalva during weightlifting cause brain damage? Holding breath for 40 seconds at a time.

Can increased icp from valsalva during weightlifting cause brain damage? Holding breath for 40 seconds at a time.

No: not good for you, but unless you have an aneurysm ready to rupture it should not cause you any damage. That is a long time to hold your breath under Valsalva stress. Might want to consider adjusting your technique when lifting. ...Read more

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Would an increase in intracranial pressure cause a reflex slower heart rate?

Would an increase in intracranial pressure cause a reflex slower heart rate?

Generally no: HR has a reflexive response to BP and not ICP. The intracranial space is somewhat self-contained in that it consists of blood, CSF, and the brain. An expansion of one (as in increased ICP) is compensated by reduction in another. If compensation is insufficient, ICP rises and if chronic, leads to dec cerebral blood flow and may lead to herniation. You may see HR and BP changes during chronic phase. ...Read more

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Iq drop from martial arts/fighting, possible?

Iq drop from martial arts/fighting, possible?

Yes. Which Style?: Yes. Obviously, any martial art or fighting that involves contact with the head can lead to concussion, traumatic brain injury, etc. There may be some styles which may be safer, such as Tai Chi & Aikido. These arts rarely have percussive impact. It all depends upon how you train. ...Read more

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Is repeated startle response (i.e "jumping") harmful after I've had a concussion? My job involves sudden, loud sounds that often provoke startling.

Is repeated startle response (i.e "jumping") harmful after I've had a concussion? My job involves sudden, loud sounds that often provoke startling.

May provoke symptoms: Although probably not harmful, loud noises and repetitive brain stimuli such as bright lights, heavy technology use, prolonged reading can all make concussion symptoms worse and prolong recovery. If you have to work, consider ear plugs or headphones if possible to reduce the loud noises and startling. If can help, then join my care team & virtual practice at www.healthtap.com/dr-clarkeholmes ...Read more

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Why do divers call decompression sickness "the bends"?

Why do divers call decompression sickness "the bends"?

They bend over: Because when dcs was discovered in the 19th century, the patients suffering from it would arch their backs in pain which resembled a then, popular dance maneuver, the "grecian bend." funny how medical terms originate. ...Read more

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What's reflex sympathetic dystrophyk?

What's reflex sympathetic dystrophyk?

Pain following injur: Reflux sympathetic dystrophy is a condition usually follows injury affects mostly hands and feet. This condition usually progresses through different phases. Definitive cause is unknown. It can happen with or without nerve injury. Treatments available. ...Read more

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What are some physiological (non-psychological) causes of exaggerated spinal reflexes (i.E. Exaggerated jerking/flinching in response to light touch)?

Startle vs DTR's: Your description of exaggerated jerking with light touch sounds like someone with very brisk "startle" reflex, as in post traumatic stress disorder. This is a physiological response to hypervigilance, as ptsd encompasses the whole person and his/her body. Hyperactive deep tendon reflexes (dtr's) can result from conditions like cerebral palsy, strokes, inflammatory diseases, and brain injury. ...Read more

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Head pressure when coughing, laughing, sneezing, bending and passing wind?

Head pressure when coughing, laughing, sneezing, bending and passing wind?

Several possibilitie: All these activities increase venous blood pressure during the action so it may be normal especially if you cough frequently. May also indicate inflammation throughout the sinuses particularly if there is nasal congestion or drainage. Make sure your blood pressure is normal. If body mass index over 40 may indicate benign intracranial hypertension. ...Read more

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What causes trachea spasms (which blocks air passage) whenever coughing occurs? Is that an asthma symptom?

What causes trachea spasms (which blocks air passage) whenever coughing occurs? Is that an asthma symptom?

Age dependent: The trachea of younger kids is somewhat rubbery, like a soft silicone or thin walled plastic. It does not spasm, like the soft walls of the gut, but it can and does vibrate enough to produce some odd sounds ( the croup noise) common from ~6mo-6yr. In tracheo-malacia, ( a transient condition) the walls are much weaker and actually cave in on each other, but soft walls not spasm is the problem. ...Read more

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