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1. A sudden outburst of emotion or action: a paroxysm of laughter.
a. A sudden attack, recurrence, or intensification of a disease.
b. A spasm or fit; a convulsion.

[Middle English paroxism, periodic attack of a disease, from Medieval Latin paroxysmus, from Greek paroxusmos, from paroxūnein, to stimulate, irritate : para-, intensive pref.; see para-1 + oxūnein, to goad, sharpen (from oxus, sharp; see ak- in Indo-European roots).]

par′ox·ys′mal (-ək-sĭz′məl) adj.
par′ox·ys′mal·ly adv.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.paroxysmal - accompanied by or of the nature of paroxysms


adj paroxístico
References in periodicals archive ?
Follow-up study of serum S100 protein concentrations demonstrated absence of normalization in the parameter in patients with psychomotor retardation and paroxysmal syndrome, no normalization of MDA level found in examinees with EBD and psychomotor retardation.
Paroxysmal tonic upgaze of childhood: effect of age-of-onset on prognosis.
Soliris paroxysmal nocturnal hemoglobinuria (PNH) (Japan)
The patient was clinically diagnosed as chronic paroxysmal hemicrania and initially treated with indomethacin.
This medication is approved to treat paroxysmal atrial fibrillation (intermittent), persistent atrial fibrillation, or atrial flutter.
outpatient participants with confirmed symptomatic paroxysmal (n = 542) or persistent (n = 121) AF.
Of the inner disorders that result in vertigo the most common cause is benign paroxysmal positional vertigo (BPPV) accounting for between 17% and 40% of all vertigo cases presenting in the clinic (1-3).
Waterloo, Belgium, a worldwide leader in the diagnosis and treatment of cardiac arrhythmias, announces that more than 10 patients have now been enrolled in the CLARITY-study ("CLARITY-AF"), comparing the efficacy, safety and efficiency of CARTO(R) 3 System guided radiofrequency ablation using the NAVISTAR(R) THERMOCOOL(R) catheter versus fluoroscopy guided radiofrequency ablation using the Pulmonary Vein Ablation catheter(R) (PVAC(R), Ablation Frontiers, Medtronic) in patients with paroxysmal atrial fibrillation (Clinicaltrials.
A/ A CANALITH REPOSITIONING MANEUVER (CRM), such as the Epley or Semont maneuver, should be the first-line treatment for benign paroxysmal positional vertigo (BPPV) in the elderly (strength of recommendation [SOR]: A, several good-quality randomized controlled trials [RCTs]).
The study included 167 people with symptomatic paroxysmal (intermittent) AF who had failed at least one antiarrhythmic drug; 61 were assigned to try a different medication, while 106 underwent ablation, in which a catheter burns the heart tissue responsible for the erratic impulses that cause AF.