B-QuiCK: How to select a beta blocker for a cardiovascular condition

0 comments
save
share
feedback
Log in
Choose another topic

B-QuiCK: How to select a beta blocker for a cardiovascular condition

  • Consider the pharmacological properties (Table 1) of individual medicines, along with patient characteristics (including co-morbidities), when selecting between beta blockers for patients with a cardiovascular condition

Table 1. Properties of funded beta blockers currently available in New Zealand.

Beta blocker Beta-adrenoceptor selectivity
N.B. Cardioselective beta blockers have greater affinity for β1-adrenoceptors.
Vasodilation Lipid solubility Excretion
Atenolol β1 selective No Low Renal
Bisoprolol β1 selective (strongly selective) No Yes Renal/hepatic
Carvedilol Non-selective (also alpha1-adrenoceptor selective) Yes Yes Hepatic
Labetalol Non-selective (also alpha1-adrenoceptor selective) Yes Yes Hepatic
Metoprolol β1 selective No Yes Hepatic
Nadolol Non-selective No Low Renal
Propranolol Non-selective No Yes Hepatic
Sotalol Non-selective No Low Renal
  • In most cases, initiate the beta blocker at a low dose and slowly up-titrate to the target or maximum tolerated dose, but this can sometimes depend on the cardiovascular indication and patient-related factors
    • For example, in atrial fibrillation the starting dose depends on the patient’s heart rate and co-morbidities: 23.75 mg metoprolol succinate, once daily, may be appropriate for a patient with a moderately elevated heart rate, but a higher initial dose, e.g. 47.5 mg, may be required for those with a significantly elevated heart rate
  • Beta blockers are generally well tolerated, but possible adverse effects depend on their properties, e.g. beta-adrenoceptor selectivity, and include bradycardia, bronchospasm, hypotension, insulin resistance, fatigue, cold extremities and sexual dysfunction
  • Treatment with beta blockers is generally long-term, but withdrawal is sometimes appropriate, e.g. if adverse effects are intolerable. Withdraw beta blockers slowly to prevent clinical deterioration and withdrawal symptoms, e.g. resting tachycardia.
    • There are no specific guidelines for withdrawing beta blockers. A pragmatic approach is to reduce the dose over several months, e.g. taper a twice daily dose to once daily for one month, and then further reduce the dose to every second day for another month, before stopping treatment completely. Halve the dose each week for patients who need a more rapid withdrawal. Monitor the patient’s heart rate and blood pressure during the dose taper.

Table 2. Summary of indications, recommendations and considerations for the use of beta blockers for cardiovascular conditions in New Zealand.

Indication Recommendation
Stable angina

Preferred: bisoprolol, metoprolol, atenolol

Beta blockers or calcium channel blockers are first line for patients with stable angina. N.B. Calcium channel blockers should generally be avoided in patients with angina and HFrEF.

All beta blockers are considered equally effective, although in practice, a cardioselective beta blocker (e.g. bisoprolol, metoprolol, atenolol) may be preferred as it is likely to provide the maximum effect with minimum adverse effects.

Arrhythmias

Preferred: bisoprolol, metoprolol succinate, carvedilol

A beta blocker is usually initiated for long-term rate control in patients with a cardiac arrythmia. A rate-limiting calcium channel blocker (diltiazem, verapamil) is also a suitable first-line option for rate control for patients with atrial fibrillation.

Any beta blocker (apart from sotalol) can be used for rate control but bisoprolol (unapproved indication), metoprolol succinate or carvedilol (unapproved indication) are usually preferred. In practice, bisoprolol is often trialled first as it is more cardioselective than metoprolol and may slow the heart rate slightly more than other beta blockers.

Heart failure

Preferred: bisoprolol, metoprolol succinate, carvedilol

International guidance is increasingly recommending that most patients with HFrEF should be established on the “four pillars of heart failure treatment” as early as possible: an ARNI, i.e. sacubitril + valsartan, beta blocker, MRA, e.g. spironolactone, eplerenone, and a SGLT-2 inhibitor, i.e. empagliflozin.

Bisoprolol, metoprolol succinate or carvedilol are the preferred beta blockers as they can reduce symptom severity, hospitalisation and mortality in people with HFrEF. Patient-specific factors guide choice. In patients with heart failure that is associated with atrial fibrillation, there is evidence that carvedilol is superior to metoprolol succinate; however, in practice, bisoprolol or metoprolol succinate is usually prescribed as these are cardioselective and generally dosed once daily. Bisoprolol may be preferred for patients experiencing hypotension or dizziness with an ARNI and carvedilol. Bisoprolol may maintain pulmonary function and protect from myocardial injury to a greater extent than carvedilol.

Post-myocardial infarction

Preferred: bisoprolol, metoprolol, atenolol

A cardioselective beta blocker, e.g. bisoprolol, is usually prescribed to patients post-myocardial infarction, however, international guidelines do not recommend a specific beta blocker.

The optimal treatment duration of a beta blocker post-myocardial infarction in patients with preserved ejection fraction and no regional wall motion abnormalities (RWMA) on echocardiogram is uncertain. Evidence increasingly supports the withdrawal of beta blockers one year post-myocardial infarction in these patients (if they do not have other indications for treatment, e.g. heart failure, arrhythmias), as treatment beyond this period has not been associated with improved cardiovascular outcomes. A beta blocker is usually required indefinitely for patients with reduced left ventricular ejection fraction or evidence of myocardial damage as demonstrated by RWMA on echocardiogram.

Hypertension

Preferred: bisoprolol, metoprolol, atenolol, carvedilol

Beta blockers are no longer first line for the management of hypertension unless there is a specific clinical reason for their use, e.g. co-morbid atrial fibrillation or heart failure, female of reproductive age.

All beta blockers are considered equally effective for hypertension. In practice, a cardioselective or vasodilating beta blocker is usually prescribed.

Co-morbidities and considerations
Renal impairment

Consider dose adjustment for water-soluble beta blockers or a lipid-soluble beta blocker may be better tolerated. Dose adjustments of bisoprolol are not usually required in renal impairment (unless impairment is severe).

Hepatic impairment

Consider dose adjustment for lipid-soluble beta blockers (e.g. metoprolol, propranolol) or switch to a water-soluble beta blocker. Carvedilol should be avoided. Dose adjustments of bisoprolol are not usually required in hepatic impairment (unless impairment is severe).

Asthma

Beta blockers are generally avoided in patients with asthma, however, if a beta blocker is required, prescribe a cardioselective beta blocker

COPD

Cardioselective beta blockers are recommended

Diabetes

Evidence suggests that carvedilol may be the preferred beta blocker for patients with cardiovascular disease and diabetes (or who are at increased risk) as it does not adversely affect glycaemic control and may improve insulin sensitivity. However, in practice, bisoprolol or metoprolol succinate is usually prescribed to these patients as these medicines are cardioselective and generally dosed once daily, whereas carvedilol is dosed twice daily and if there are issues with adherence, this would reduce the benefit.

Pregnancy

Labetalol is usually first line if a beta blocker is indicated during pregnancy as it is generally associated with the lowest risk of adverse neonatal effects. Metoprolol or bisoprolol may be a suitable alternative if required.

Breast feeding

Carvedilol, labetalol, metoprolol and propranolol are present in breast milk in low quantities but this is not expected to affect infants. Atenolol, sotalol and nadolol should generally be avoided while breast feeding (particularly for newborns and pre-term infants or if taking high doses) as they are excreted in breast milk in higher quantities.

Other considerations

Cardioselective beta blockers (e.g. bisoprolol, metoprolol, atenolol) are less likely to cause cold extremities

Water-soluble beta blockers (e.g. atenolol) are less likely to cause central nervous system effects such as sleep disturbances

Bisoprolol is less likely to cause sexual dysfunction compared to other beta blockers

N.B. When “metoprolol” is specified, either the succinate or tartrate salt can be prescribed. In practice, metoprolol succinate is often preferred as it is usually dosed once daily.

HFrEF = heart failure with reduced ejection fraction, ARNI = angiotensin-receptor neprilysin inhibitor, MRA = mineralocorticoid receptor antagonist, SGLT-2 inhibitor = sodium-glucose co-transporter 2 inhibitor, ACE inhibitor = angiotensin-converting enzyme inhibitor, ARB = angiotensin-II receptor blocker

There are currently no comments for this article.

Please login to make a comment.

Made with by the bpacnz team

Partner links