Is a heart rate of 42 at night dangerous? i have wpw syndrome and on propranolol. i wake up dizzy sometimes.

WPW bradycardia: Bradycardia is not uncommon during sleep however if symptoms develop the HR needs to be addressed. Please see your cardiologist to evaluate and possibly adjust your propranolol dose.

Report: You should report to your cardiologist about this -- so he could monitor your heart properly and perhaps help with your dizziness also. The heart rate below 50 is generally too low.

WPW bradycardia: A heart rate of 42 BPM is slow but not necessarily dangerous. Propanolol is used to prevent attacks of supraventricular tachycardia (SVT) but may cause bradycardia. See your physician to find the optimal dose of beta blocker (propanolol) which prevents episodes of SVT while minimizing bradycardia.

Not really: It really depends on the condition of your heart. A low heart rate is dangersous in someone with a weak heart, such as someone who has had many heart attacks and has weak heart muscles. At your age, your body has probably compensated for the low heart rate by constriting your peripheral blood vessels, preserving flow to your organs.

WPW propranolol: WPW w/ mild symptoms can be treated w/ different meds, depending on what EKG shows. Without seeing yours, not sure if Inderal (propranolol) is best choice; it slows heart rate & lowers blood pressure, which may be why U feel dizzy. Discuss this med & your symptoms w/ GP or cardiologist. You may need electro-cardioversion to treat your WPW. HR in young/athletic may be OK except if side effects not tolerated.

Not really: There is nothing particularly dangerous about a low heart rate. Some athletes naturally have heart rates in the 40s. The difference is yours is being artificially held low by the medicine. Dizziness would therefore be a side effect of the medicine and you should speak to your cardiologist regarding this. Low heart rate is only dangerous if you have pauses in your rhythm which happens with age

H.R of 42 can be -: Dangerous. See U r Cardiologist. Propranolol dose need to be adjusted, or changed to another drug.Sometime low heart rate like this can trigger tachyarrhythmia and other complications. See the MD.