You are taking care of a client with hypotension. The doctor ordered a drug that would increase cardiac contractility. Which of the following is/are would manage this condition and is considered an Alpha & Beta- adrenergic agonist? (Select all that apply) Dobutamine Ephedrine Dopamine
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You are taking care of a client with hypotension. The doctor ordered a drug that would increase cardiac contractility. Which of the following is/are would manage this condition and is considered an Alpha & Beta- adrenergic agonist? (Select all that apply)
- Dobutamine
- Ephedrine
- Dopamine
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- Which of the following combinations would have OPPOSITE effects in changing heart rate? atropine and norepinephrine atropine and a cholinesterase inhibitor epinephrine and norepinephrine acetylcholine and a cholinesterase inhibitorA drug that blocks the cardiac muscarinic receptor might be expected to: Increased heart rate Decreased heart rate Open mechanically-gated K channels Decreased contractility Decrease pacemaker potentialNorepinephrine acts on heart muscle cells by: Group of answer choices blocking the action of calcium. increasing heart contractility. causing a decrease in stroke volume. causing threshold to be reached more quickly. more than one of the above.
- The autonomic nervous system can change the rate of the heart by: can choose more than one Group of answer choices - beta1 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells. This increases the frequency of APs of the pacemaker, and increases the rate of contraction. - alpha1 adrenergic receptor activation. - muscarinic ACh receptors activation. Activation leads to reduced activity of Ca2+ channels, and increasing activation of K+ channels, hyperpolarizing cells and reducing the rate of contraction. - beta2 adrenergic receptor activation. Increases in cAMP lead to increased amounts of Na+ influx (though If channels) and Ca2+ influx of the pacemaker cells. This increases the frequency of APs of the pacemaker, and increases the rate of contraction.Which of the following statements best describes the actions of adrenoceptor agonists or antagonists? β-Adrenoceptor agonists are used clinically to treat different cardiovascular conditions, including heart failure. α-Adrenoceptor antagonists are used clinically to treat glaucoma. β-Adrenoceptor antagonists are used clinically to treat different cardiovascular conditions, including hypertension. α-Adrenoceptor agonists are used clinically to acutely reduce blood pressure.I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.
- Why is it possible for acetylcholine to actually cause an increase in stroke volume, even though increased parasympathetic activity causes an overall decrease in cardiac output?Choose whether the following are positive or negative inotropic agents. positive negative inotropic inotropic Agent epinephrine anoxia Beta blockers acidosis digitalis increased potassium sympathetic stimulation Calcium channel blockers increased calcium thyroid hormones List 6 things (from your PowerPoint) that result in an increase in heart rate.Which of the following statements best describes the actions of the neurotransmitter noradrenaline in the heart? Noradrenaline acts on α1-adrenoceptors in the sinoatrial node to increase heart rate. Noradrenaline decreases the rate and force of contraction of the heart. Noradrenaline increases the rate, but not the force of contraction of the heart. Noradrenaline acts on β1-adrenoceptors in the sinoatrial node to increase heart rate.
- Which of the following can be considered as a clinical use of nicotinic antagonists? Used clinically in surgical operation causing skeletal muscles relaxation Used clinically in surgical operation causing smooth muscles relaxation All the answers are correct Used clinically in surgical operation causing cardiac muscle relaxationNorepinephrine binds to which of the following adrenergic receptors to speed up the heart? Select one: B2 adrenergic receptors x a1 adrenergic receptors a2 adrenergic receptors B3 adrenergic receptors B1 adrenergic receptorsSlow conduction in the atrioventricular node is associated with which of the following? Group of answer choices Prolonged PR interval Prolonged QRS interval Shortened QT interval Elevated ST segment