Diagnosis. Bradycardia is typically defined as a heart rate
60 beats/min. Many patients are asymptomatic with a
heart rate lower than 50 beats/min; however, some
patients may have associated symptoms such as fatigue,
limitations in physically activity, syncope, or dizziness.
Diagnostic tests to determine the type of bradycardia
include an electrocardiogram, Holter monitor, and
screening for underlying disorders such as thyroid disease
or electrolyte abnormalities.
Treatment. PACLITAXEL. In general, bradycardia associated
with paclitaxel use is without clinical significance; however,
some patients have required pacemaker implantation. According
to the package insert, frequent vital sign monitoring,
particularly during the first hour of paclitaxel infusion,
is recommended. Continuous cardiac monitoring is not
required except for patients with serious conduction abnormalities
(10). In addition, all patients should be given a
pre-medication regimen before paclitaxel infusion to prevent
severe hypersensitivity reactions. Since histamine release
has been implicated as a possible mechanism for
paclitaxel-induced bradycardia, this may also aid in the
prevention of bradycardia as well. In any case, bradycardia
alone does not appear to be an indication to discontinue
paclitaxel treatment, since many of these cases are asymptomatic.
However, if the patient develops bradycardia with
progressive atrioventricular conduction disturbances and/or
clinically significant hemodynamic effects, paclitaxel discontinuation
is warranted.
THALIDOMIDE. Treatment of bradycardia depends on
whether the patient is symptomatic. If the patient is
asymptomatic, no treatment is usually necessary, but careful
observation is warranted. In some cases, a reduction in the
daily dosing of thalidomide may be required. For the
treatment of symptomatic bradycardia, thalidomide therapy
should be discontinued. Furthermore, in patients with
Diagnosis. Bradycardia is typically defined as a heart rate60 beats/min. Many patients are asymptomatic with aheart rate lower than 50 beats/min; however, somepatients may have associated symptoms such as fatigue,limitations in physically activity, syncope, or dizziness.Diagnostic tests to determine the type of bradycardiainclude an electrocardiogram, Holter monitor, andscreening for underlying disorders such as thyroid diseaseor electrolyte abnormalities.Treatment. PACLITAXEL. In general, bradycardia associatedwith paclitaxel use is without clinical significance; however,some patients have required pacemaker implantation. Accordingto the package insert, frequent vital sign monitoring,particularly during the first hour of paclitaxel infusion,is recommended. Continuous cardiac monitoring is notrequired except for patients with serious conduction abnormalities(10). In addition, all patients should be given apre-medication regimen before paclitaxel infusion to preventsevere hypersensitivity reactions. Since histamine releasehas been implicated as a possible mechanism forpaclitaxel-induced bradycardia, this may also aid in theprevention of bradycardia as well. In any case, bradycardiaalone does not appear to be an indication to discontinuepaclitaxel treatment, since many of these cases are asymptomatic.However, if the patient develops bradycardia withprogressive atrioventricular conduction disturbances and/orclinically significant hemodynamic effects, paclitaxel discontinuationis warranted.THALIDOMIDE. Treatment of bradycardia depends onwhether the patient is symptomatic. If the patient isasymptomatic, no treatment is usually necessary, but carefulobservation is warranted. In some cases, a reduction in thedaily dosing of thalidomide may be required. For thetreatment of symptomatic bradycardia, thalidomide therapyshould be discontinued. Furthermore, in patients with
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