MH Information for patients and families

How to prepare for surgery or medical procedures

Patients who are susceptible to MH can undergo anaesthesia safely if their treating doctors are forewarned. Early communication to your treatment team if you are having planned surgery is essential so that everyone can be prepared, Anaesthetists are trained in how to deliver MH safe anaesthesia but they do need time to prepare.

Tips for communicating with healthcare providers

Not all clinicians are familiar with MH

All anaesthetists will know about MH but may consult with an MH unit for specific clarification

Tell your surgeon and ask for an early (days to weeks before) discussion with your anaesthetist

Frequently asked questions 

I  have had a few uncomplicated anaesthetics before, does that mean I am not at risk?

Triggering anaesthetics do not necessarily cause an MH crisis every time someone at risk is given them. MH is hereditary; it is passed on through the family. It affects males and females equally, and can occur in every ethnicity. A person with MH has a 50% chance of passing that risk on to each child that they have.

Is there a cure?

There is no cure for the predisposition to MH. The management of MH involves avoiding the triggering agents during anaesthesia.

Dantrolene is a drug that can help in the treatment of an MH crisis. Anywhere where triggering agents are used, dantrolene should be available.

What anaesthetics are safe?

Patients who are susceptible to MH can undergo anaesthesia safely. Non-triggering general anaesthesia with intravenous anaesthesia agents after purging the anaesthetic machine of all volatile residues is safe. Nitrous oxide (laughing gas) is safe. Local anaesthetics are safe. Spinal, epidural and other regional (numbing) anaesthetics are safe.

What drugs must I avoid?

The only drugs necessary to avoid in MH are all volatile anaesthetic agents (including methoxyflurane