[Diazepam (valium). Changes in haemodynamics, myocardial oxygen consumption and vascular tone (author's transl)].

In 30 patients with congenital or acquired heart disease the haemodynamic effects of diazepam (Valium) 0.3 mg/kg were investigated during surgical procedures under neuroleptanalgesia. The following parameters were measured or calculated: Heart rate (HR), arterial pressure (-Part, Psyst, Pdiast), pulmonary artery pressure (-PAP), right (-PRA) and left atrial pressure (-PLA), left ventricular pressure (PLV), left ventricular enddiastolic pressure (PLVED), left ventricular peak dp/dt (dp/dtmax), cardiac output (CO), cardiac index (CI), stroke volume (SV), stroke index (SI), total systemic resistance (TSR), total pulmonary resistance (TPR), work index of the right (RVWI) and left ventricle (LVWI). In comparison with a control group (n = 36) diazepam caused a decrease in arterial pressure cardiac index, stroke index, right and left atrial pressure and dp/dtmax. This, however, was mainly attributable to vasodilatation and not to a negative inotropic effect, which is of only minor importance with diazepam. These haemodynamic changes resulted in a reduction in myocardial oxygen consumption. Diazepam is a valuable drug in neuroleptanalgesia, when an increase in blood pressure can not be controlled by fentanyl or droperidol.