Respiratory and haemodynamic modifications during right heart catheterization in COLD patients.

Noninvasive measurement of the systolic time intervals is a routine procedure for the determination of myocardial performance, even in subjects without clinical or electrocardiographic signs of cardiopathy. Statistically significant differences in pre-ejection period (PEP) and PEP/left ventricular ejection time (LVET) between days and between observations were demonstrated by Levi et al. A high correlation between systolic time intervals and catecholamines was recorded. The aim of the present study was to evaluate the spontaneous modifications in pulmonary and cardiac parameters during a stressful situation, such as right heart catheterization. Seventeen patients with chronic obstructive lung disease (COLD) underwent right heart catheterization. Heart rate (HR), systemic artery pressure (SAP), pulmonary artery pressure (PAP), cardiac output (Q'c), cardiac index (CI), systolic stroke volume (SV), respiratory rate (RR), minute ventilation (V'E), oxygen consumption (V'O2), carbon dioxide production (V'CO2), their ratio (RQ), arterial and venous O2 and CO2, systolic time intervals (total electromechanical interval (QS2), LVET, PEP, PEP/LVET), total pulmonary resistance (TPR), adrenaline (A), and noradrenaline (NA) were recorded at the beginning of the test and 20, 40, 60 and 80 min thereafter. Analysis of variance (ANOVA) showed significant differences between the observations for systolic pulmonary artery pressure (SPAP), Q'c, V'O2, V'CO2, V'E, PEP/LVET, and NA. In conclusion, it is necessary to take into account spontaneous modifications in pulmonary haemodynamic parameters following a stressful situation, such as a catheterization, when studying the effects of drugs such as vasodilators and vasoactive agents.

An unusual increase in haemodynamic values in a sleep apnoea syndrome patient with prolonged apnoea.

This case report shows the results of a right heart catheterisation in a patient with sleep apnoea syndrome (SAS). Arterial oxygen saturation (SaO2), heart rate, oronasal flow, and monitoring of electroencephalographic (EEG), sovrayoidal electromyographic (EMG) and thoracoabdominal movements were recorded simultaneously. A mixed apnoea of 180 s was registered, SaO2 fell to 54% and systolic pulmonary artery pressure (sPAP) increased to 130 mmHg. Slowly, haemodynamic values began to normalise with the reappearance of respiratory acts. We can hypothesize that this patient's nocturnal apnoeas may cause frequent and deep negative pleural pressure swings, with severe continuous action on pulmonary circulation. This case report has shown that a SAS patient is capable of developing an adaptative response to an unusual and remarkable systolic pulmonary artery pressure increase, which is mainly due to hypoxic vasoconstriction.

Plasma hormone levels and haemodynamics in patients with chronic obstructive lung disease.

Chronic obstructive pulmonary disease (COPD) is associated with right heart failure and salt and water retention. The possible roles of haemodynamically active hormones in the early stages of COPD have not previously been described. Adrenaline, noradrenaline, renin activity, aldosterone, vasopressin, cortisol, growth hormone, prolactin and atrial natriuretic peptide (ANP) were measured during right heart catheterization in mixed venous blood and in a peripheral artery, in the supine and standing position, in two groups of patients with COPD: Group A with arterial oxygen tension (Pa,O2) < 8.0 kPa (60 mmHg) and Group B with Pa,O2 > 8.0 kPa (60 mmHg). A group of 15 control subjects was studied to obtain control hormonal measurements with a venous blood sample only. Haemodynamic and blood gas values and hormone levels were measured in the supine and standing positions to record changes in the various parameters in COPD patients, and the relationship between pulmonary haemodynamics and hormone levels. No differences were found in hormonal samples between peripheral artery and mixed venous blood. In comparison with the control group, both groups of COPD patients showed a significant reduction in cortisol (p < 0.0001) and in vasopressin (p < 0.005), and an increase in ANP (p < 0.05) and growth hormone (p < 0.05). A marked, but not significant, increase in renin activity, and aldosterone was also found. After standing the increment of adrenaline was significantly higher in COPD patients (p < 0.02). A significant inverse relationship was recorded between forced expiratory volume in one second (FEV1) and noradrenaline (p < 0.02). There is a complex hormonal response even in the early phase of chronic obstructive pulmonary disease. An increase of plasma levels of atrial natriuretic peptide appears to be the earliest neuroendocrine response in these patients.

Coxsackie virus heart disease and cardiomyopathy.

Twenty-two cases of Coxsackie virus heart disease diagnosed from November, 1969, to December, 1971, were re-examined after a period of 42 to 68 months from the acute illness. The patients with hypertension, diabetes, chronic alcohol intake, or aged over 35 were eliminated from the trial. With the purpose of assessing myocardial function, the systolic time intervals were recorded by a noninvasive standard technique. The differences in systolic time intervals between the group of patients with previous viral myocarditis and a group of normal control subjects were not statistically significant. However, the pre-ejection period was clearly prolonged in three patients out of 10, a modification consistent with a depressed myocardial function, as in patients with cardiomyopathy.

Preclinical abnormaltiy of left ventricular function in chronic alcoholics.

Left ventricular function of a sample of subjects with chronic alcohol intake, in the form of wine, and without clinical or electrocardiographic signs of heart disease was compared with that of a sample of normal control subjects using non-invasive polygraphic recordings. The statistical analysis has shown significant prolongation of PEP, PEPI, an increase in PEP/LVET, and a shortening of LVET and LVETI in the alcoholic subjects compared with the controls. All these abnormalities may be ascribed to left ventricular malfunction.

On the reliability of systolic time intervals.

With the purpose of detecting spontaneous variation of systolic time intervals (STI), 20 normal subjects have been examined and the STI has been recorded for 5 consecutive days at the beginning of the test and 20, 40 and 60 min afterwards. Significant differences were found for PEP, LVET and the PEP/LVET ratio between observations (p less than 0.05) and between days (p less than 0.01). All the values of the STI at the fifth day are rather near the values recorded at the last observation of the first day. This may be related to the presence of some factor (catecholamine release induced by emotional stress?) resulting in physiological changes which are reduced by repetition of the test. This hypothesis was confirmed in a second series of normal volunteers where the STI were recorded simultaneously with sampling of blood for assessing circulating CA levels. A highly significant correlation (p less than 0.001) was recorded between PEP, PEP/LVET and plasma CA making it evident that increase of PEPI and PEP/LVET is directly correlated with the reduction of plasma CA level.

Physical rehabilitation in coronary patients who have suffered from episodes of cardiac failure.

The effects of bicycle training for 5 weeks were evaluated in 12 patients after myocardial infarction with left ventricular dysfunction (left ventricular ejection fraction < 40%) and at least one episode of cardiac failure in the past. The patients were divided into two groups of six according to the Weber classification: Group B (VO2/kg/min: 16-20) and Group C (VO2/kg/min: 10-15). Cardiopulmonary and hemodynamic parameters were evaluated during a maximal exercise test and a simultaneous catheterization of the right side of the heart before and after the training. An increase in the capacity for work was recorded in Group B (p < 0.02), while Group C remained unchanged. A statistically significant increase in minute ventilation (p < 0.05) and VO2/kg/min (p < 0.0006) was recorded in Group B. Group C showed an increase in the mean pulmonary arterial pressure (p < 0.03). All of the other parameters remained unchanged after training. We conclude that physical rehabilitation improves the tolerance to exercise in patients with a mildly depressed cardiac function (Group B) but not in patients with a very depressed cardiac function (Group C).

[A double-blind cross-over trial of a new hypolipidaemic drug (author's transl)]. / Studio in doppio cieco ed in cross-over di un nuovo farmaco ipolipemizzante.

A double blind cross-over trial has been carried out on the effects of a nicotinic acid compound on 27 patients affected by hyperlipidemia. The subjects have been treated over one year according the following plan: two peroids of 90 days each with the drug and two with placebo. The statistical analysis showed a significant reduction of serum cholesterol triglycerides, phospholipids and total lipids. In 4 patients out of 27, the treatment has not been completed because of drug intollerance.