in 2.5 cc water, repeat every 20 minutes as needed, cautioning for myocardial variability.
Patients who are comatose, hypotensive, or seizing or have cardiac arrhythmia should be treated in the conventional manner, observing the precautions about catecholamines described above. Arrhythmias might respond to beta-adrenergic blockers (e.g., propranolol, esmolol) if lidocaine is ineffective.