Patent Foramen Ovale: hole in the heart or hole in the market?
Seminar program Diver 2014
Decompression sickness occurs after diving and is caused by the formation of nitrogen bubbles in tissue and/or blood vessels when compressed air is used. An important cause is exceeding the “no-deco” limits. So much nitrogen is then absorbed into the tissue that it can no longer be safely dissolved in the venous (venous) blood and discharged via the lungs within the usual time limits. The lungs normally act as a filter that traps nitrogen bubbles.
If there are a lot of nitrogen bubbles, this exceeds the filtering capacity of the lungs and nitrogen bubbles still end up in the arteries. The nitrogen bubbles in the arteries can then get stuck in the small blood vessels of the brain, for example, and cause damage there, such as a stroke with paralysis or severe dizziness.
However, divers who adhere to the “no-deco” limits can also develop decompression sickness. In that case, I will look for shunts, ie connections between the venous and arterial (venous and arterial) circulation. These shunts bypass the lungs, reducing the function of the lungs as a filter for the nitrogen bubbles. One of the possible shunts is the Patent Foramen Ovale, or PFO. This is a connection between the left and right atrium of the heart. Normally it is functionally closed, but under special circumstances it can still open and nitrogen bubbles can end up in the arteries.
A PFO can be closed with an “umbrella”. There is discussion about which PFOs qualify for this and in which syndromes a PFO should be closed. There is also discussion about the preventive closure of PFOs in people who have not yet experienced decompression sickness, for example in trimix divers. Since a PFO occurs in approximately 1/3 of the (diving) population, the preventive closure of a PFO in divers could be a gap in the market. What do the experts say?
[intense_content_section border_bottom=”2″ margin_bottom=”30″ margin_top=”20″ padding_bottom=”10″ padding_top=”10″ padding_left=”5″ padding_right=”5″]
Rienk Rienks is a cardiologist at the UMCU and the Central Military = Hospital (CMH) in Utrecht. He also has an outpatient clinic for (among others) divers with cardiological problems, CardioExpert, in Rotterdam.
Through his work at the CMH he came into contact with cardiac problems of diving soldiers, and has since acquired an expertise in this area. He has good contacts with the Diving Medical Center (DMC) of the Royal Netherlands Navy in Den Helder. In 2011 he obtained the certificate “Diving doctor A”. He has been diving since 1982 and is qualified as a PADI advanced open water diver, rescue diver, and Nitrox diver.
Share this message
Tips to read about Duikvaker
This year Anchor Dive Lights (Ireland) will again participate in Duikvaker. Representing this year by Marjolein van Laere and Frans de Pater of Anchor Diving BV Anchor Dive Lights designs high-quality, modular dive lights in refreshing colors for the amateur and professional diver. In addition to the extensive range of diving, photo and video lamps, there is also…read more
A whole day dedicated to vlogging on Duikvaker with useful tips, assistance with editing and presentation. Are you in? On Saturday 3 and Sunday 4 February, DuikeninBeeld and Duikvaker invite divers to come vlogging. A one day workshop at the best diving event of the year! Programme: 10:00…read more
Divespotter is the new platform that the NOB launched last December. It's the place to find inspiration for your next dive, including hundreds of articles from Onderwatersport Magazine. Divespotter focuses on twelve themes: think of underwater biology and wreck diving, but also equipment, technical diving and foreign diving travel destinations.…read more
Malta, a diving destination suitable for all types of divers who love adventure! Diving around Malta and Gozo is nothing short of fantastic as visibility is very good (sometimes up to 40m!) and there are spectacular drop-offs. It is a good destination for underwater photography and lovers of cave and wreck diving can also…read more
During Duikvaker on 3 and 4 February 2018, there will be plenty of attention for the underwater world. After all, it is indispensable for every diver! You can dive wherever there is water! But as divers we prefer to put our heads under water in a place where it is beautiful, where there is life and where there is something to experience…read more
Information Duikvaker 2023
February 1, 2025 from 10am - 6pm
February 2, 2025 from 10am - 5pm
3992 AE Houten
Duikvaker is organized by The Exhibition Company
email@example.com • www.exhibitioncompany.nl
IBAN: NL77 RABO 0341 4557 41 • Chamber of Commerce: Utrecht 30122269 • VAT: 803128046B01