Table 1 Treatment Protocol for the Evaluation of Cardiopreventive Effects of Aqueous Leaf Extracts of X. americana and P. capensis in Rats with Myocardial Infarction

I (normal control)

Vehicle (0.9% w/v normal saline)

II (negative control)

Vehicle + 7.5 mg Kg⁻¹ bw⁻¹ Salbutamol

III (positive control)

10 mg Kg⁻¹ bw⁻¹ Propranolol + 7.5 mg Kg⁻¹ bw⁻¹ Salbutamol

IV (experimental A)

50 mg Kg⁻¹ bw⁻¹ Extract + 7.5 mg Kg⁻¹ bw⁻¹ Salbutamol

V (experimental B)

100 mg Kg⁻¹ bw⁻¹ Extract + 7.5 mg Kg⁻¹ bw⁻¹ Salbutamol

VI (experimental C)

150 mg Kg⁻¹ bw⁻¹ Extract + 7.5 mg Kg⁻¹ bw⁻¹ Salbutamol