What question did this study set out to answer?

To investigate the haemodynamic effects, efficacy, and tolerance of intravenous labetalol for managing systemic hypertension during the acute phase of myocardial infarction.

June 1, 1983HeartOpen Access

Treatment of hypertension in acute stage of myocardial infarction. Haemodynamic effects of labetalol.

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Why the study?

Does labetalol infusion improve haemodynamic variables and lower blood pressure in patients with acute myocardial infarction and systemic hypertension?

Key Points

To investigate the haemodynamic effects, efficacy, and tolerance of intravenous labetalol for managing systemic hypertension during the acute phase of myocardial infarction.
Infused escalating doses of labetalol to achieve a systolic blood pressure below 130 mmHg in 11 patients presenting with acute myocardial infarction and systolic blood pressure above 150 mmHg.
Maintained an optimal infusion rate for one hour (mean rate: 2.3 mg/min) while recording haemodynamic parameters before, during, and after administration.
Labetalol lowered blood pressure across all 11 patients, driven by reductions in total systemic resistance (17.7 to 14 IU), cardiac index (3.1 to 2.7 L/min per m²), and heart rate (94 to 81 beats/min), with stroke index remaining unchanged.
The double product decreased substantially from 16,497 to 8,598 mmHg·beats/min, and mean pulmonary wedge pressure dropped in the subset of six patients with initial pressures above 15 mmHg.

Structured PICO

Does labetalol infusion improve haemodynamic variables and lower blood pressure in patients with acute myocardial infarction and systemic hypertension?

Population

11 patients with acute myocardial infarction and systemic hypertension (systolic blood pressure above 150 mmHg)

Intervention

Labetalol infusion (increasing doses to lower systolic blood pressure to less than 130 mmHg, then maintained for one hour at a mean rate of 2.3 mg/min)

Outcome

Haemodynamic effects (including blood pressure, total systemic resistance, cardiac index, stroke index, heart rate, pulmonary wedge pressure, and double product) and tolerancesurrogate

Labetalol effectively lowers blood pressure and reduces myocardial oxygen requirements in patients with acute myocardial infarction and hypertension, without worsening moderate left-sided heart failure.

Discussion

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Implication

May support labetalol for BP control in hypertensive AMI without worsening HF; hypothesis-generating pending randomized trials.

Cite This Study

Renard et al. (1983) studied this question.

synapsesocial.com/papers/6a777912d8eb58afc2bde46d https://doi.org/10.1136/hrt.49.6.522

Topics

Hypertension management

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Treatment of hypertension in acute stage of myocardial infarction. Haemodynamic effects of labetalol.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Topics

Treatment of hypertension in acute stage of myocardial infarction. Haemodynamic effects of labetalol.

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Topics

Also Consider